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<div class="textblock"><code>#include <<a class="el" href="grpc_8h_source.html">grpc/grpc.h</a>></code><br/>
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<p><a href="census_8h_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a>
Data Structures</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structcensus__timestamp.html">census_timestamp</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">This structure represents a timestamp as used by census to record the time at which an operation begins. <a href="structcensus__timestamp.html#details">More...</a><br/></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structcensus__rpc__name__info.html">census_rpc_name_info</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Represent functions to map RPC name ID to service/method names. <a href="structcensus__rpc__name__info.html#details">More...</a><br/></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structcensus__trace__record.html">census_trace_record</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Trace record. <a href="structcensus__trace__record.html#details">More...</a><br/></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structcensus__tag__const.html">census_tag_const</a></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structcensus__value.html">census_value</a></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structcensus__aggregation.html">census_aggregation</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Information needed to instantiate a new aggregation. <a href="structcensus__aggregation.html#details">More...</a><br/></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structcensus__view__aggregation__data.html">census_view_aggregation_data</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Holds all the aggregation data for a particular view instantiation. <a href="structcensus__view__aggregation__data.html#details">More...</a><br/></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structcensus__view__data.html">census_view_data</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Census view data as returned by <a class="el" href="census_8h.html#ab7146edc8582fe2e6dc537f006e29cc5" title="Get data from aggregations associated with a view. ">census_view_get_data()</a>. <a href="structcensus__view__data.html#details">More...</a><br/></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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Macros</h2></td></tr>
<tr class="memitem:acb35403ed23ba2615457fabaa0b430e7"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#acb35403ed23ba2615457fabaa0b430e7">CENSUS_TRACE_RECORD_START_OP</a>   ((<a class="el" href="port__platform_8h.html#aa6abd4df815a5498d1a04b5e691a74a9">gpr_uint32</a>)0)</td></tr>
<tr class="separator:acb35403ed23ba2615457fabaa0b430e7"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a003fb5bda98c95408a21d3a47571a1e9"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a003fb5bda98c95408a21d3a47571a1e9">CENSUS_TRACE_RECORD_END_OP</a>   ((<a class="el" href="port__platform_8h.html#aa6abd4df815a5498d1a04b5e691a74a9">gpr_uint32</a>)1)</td></tr>
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<tr class="memitem:aa89c96f0f32d85a1b28b68f0ef326dd4"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#aa89c96f0f32d85a1b28b68f0ef326dd4">CENSUS_MAX_TAG_KEY_LENGTH</a>   20</td></tr>
<tr class="separator:aa89c96f0f32d85a1b28b68f0ef326dd4"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a22d6971ca41fd944e13e5b4c2a42bf8c"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a22d6971ca41fd944e13e5b4c2a42bf8c">CENSUS_MAX_TAG_VALUE_LENGTH</a>   50</td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="typedef-members"></a>
Typedefs</h2></td></tr>
<tr class="memitem:a27fc8788690179599713226f1f054736"><td class="memItemLeft" align="right" valign="top">typedef struct <a class="el" href="structcensus__context.html">census_context</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a27fc8788690179599713226f1f054736">census_context</a></td></tr>
<tr class="memdesc:a27fc8788690179599713226f1f054736"><td class="mdescLeft"> </td><td class="mdescRight">Context is a handle used by census to represent the current tracing and tagging information. <a href="#a27fc8788690179599713226f1f054736">More...</a><br/></td></tr>
<tr class="separator:a27fc8788690179599713226f1f054736"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:afc68a73849e0d1565e74c28c822bb086"><td class="memItemLeft" align="right" valign="top">typedef struct <a class="el" href="census_8h.html#afc68a73849e0d1565e74c28c822bb086">census_tag_set</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#afc68a73849e0d1565e74c28c822bb086">census_tag_set</a></td></tr>
<tr class="separator:afc68a73849e0d1565e74c28c822bb086"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a22a740b7e9e3798cb9208b3bd6ea31a7"><td class="memItemLeft" align="right" valign="top">typedef struct <br class="typebreak"/>
<a class="el" href="census_8h.html#a22a740b7e9e3798cb9208b3bd6ea31a7">census_tag_set_iterator</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a22a740b7e9e3798cb9208b3bd6ea31a7">census_tag_set_iterator</a></td></tr>
<tr class="separator:a22a740b7e9e3798cb9208b3bd6ea31a7"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a2b2990a51808c9177b14476195a9fb94"><td class="memItemLeft" align="right" valign="top">typedef struct <br class="typebreak"/>
<a class="el" href="structcensus__aggregation__ops.html">census_aggregation_ops</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a2b2990a51808c9177b14476195a9fb94">census_aggregation_ops</a></td></tr>
<tr class="memdesc:a2b2990a51808c9177b14476195a9fb94"><td class="mdescLeft"> </td><td class="mdescRight">Type representing a particular aggregation. <a href="#a2b2990a51808c9177b14476195a9fb94">More...</a><br/></td></tr>
<tr class="separator:a2b2990a51808c9177b14476195a9fb94"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ae43cfb236f1c79eeefb4d9bdf91e3aed"><td class="memItemLeft" align="right" valign="top">typedef struct <a class="el" href="census_8h.html#ae43cfb236f1c79eeefb4d9bdf91e3aed">census_view</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#ae43cfb236f1c79eeefb4d9bdf91e3aed">census_view</a></td></tr>
<tr class="memdesc:ae43cfb236f1c79eeefb4d9bdf91e3aed"><td class="mdescLeft"> </td><td class="mdescRight">A census view type. <a href="#ae43cfb236f1c79eeefb4d9bdf91e3aed">More...</a><br/></td></tr>
<tr class="separator:ae43cfb236f1c79eeefb4d9bdf91e3aed"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="enum-members"></a>
Enumerations</h2></td></tr>
<tr class="memitem:abe92e59c22481b0de3742673cbbb1bf8"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#abe92e59c22481b0de3742673cbbb1bf8">census_features</a> { <br/>
  <a class="el" href="census_8h.html#abe92e59c22481b0de3742673cbbb1bf8aac1986834f37851b8d899c4a08c8e3ab">CENSUS_FEATURE_NONE</a> = 0,
<a class="el" href="census_8h.html#abe92e59c22481b0de3742673cbbb1bf8ab0722326e730113d5be97f643c3e6718">CENSUS_FEATURE_TRACING</a> = 1,
<a class="el" href="census_8h.html#abe92e59c22481b0de3742673cbbb1bf8a84c772b868e53ee3487c7bfc8e8b2f1a">CENSUS_FEATURE_STATS</a> = 2,
<a class="el" href="census_8h.html#abe92e59c22481b0de3742673cbbb1bf8a4808bff624e2377596b86a6f58ab04b5">CENSUS_FEATURE_CPU</a> = 4,
<br/>
  <a class="el" href="census_8h.html#abe92e59c22481b0de3742673cbbb1bf8aba96a94fb7af8cf1144ca14edc0b1f0c">CENSUS_FEATURE_ALL</a>
<br/>
}</td></tr>
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<tr class="memitem:ad4ff7b1db813ee5318871121bb4281cc"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#ad4ff7b1db813ee5318871121bb4281cc">census_trace_mask_values</a> { <a class="el" href="census_8h.html#ad4ff7b1db813ee5318871121bb4281cca21afa23a531e5d54e70d44ec3c18cfb3">CENSUS_TRACE_MASK_NONE</a> = 0,
<a class="el" href="census_8h.html#ad4ff7b1db813ee5318871121bb4281ccaadcf28b76de06181051506c96996255a">CENSUS_TRACE_MASK_IS_SAMPLED</a> = 1
}</td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:a4cea92157f3de215724f6bf4aeaee1b6"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a4cea92157f3de215724f6bf4aeaee1b6">census_initialize</a> (int features)</td></tr>
<tr class="memdesc:a4cea92157f3de215724f6bf4aeaee1b6"><td class="mdescLeft"> </td><td class="mdescRight">Shutdown and startup census subsystem. <a href="#a4cea92157f3de215724f6bf4aeaee1b6">More...</a><br/></td></tr>
<tr class="separator:a4cea92157f3de215724f6bf4aeaee1b6"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa792b067548ecdd987d560b492c83d85"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#aa792b067548ecdd987d560b492c83d85">census_shutdown</a> (void)</td></tr>
<tr class="separator:aa792b067548ecdd987d560b492c83d85"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad5f627a64ac4febbc61d2b89801d40e9"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#ad5f627a64ac4febbc61d2b89801d40e9">census_supported</a> (void)</td></tr>
<tr class="memdesc:ad5f627a64ac4febbc61d2b89801d40e9"><td class="mdescLeft"> </td><td class="mdescRight">Return the features supported by the current census implementation (not all features will be available on all platforms). <a href="#ad5f627a64ac4febbc61d2b89801d40e9">More...</a><br/></td></tr>
<tr class="separator:ad5f627a64ac4febbc61d2b89801d40e9"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a742616973e78aaf969389cea20feea9f"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a742616973e78aaf969389cea20feea9f">census_enabled</a> (void)</td></tr>
<tr class="memdesc:a742616973e78aaf969389cea20feea9f"><td class="mdescLeft"> </td><td class="mdescRight">Return the census features currently enabled. <a href="#a742616973e78aaf969389cea20feea9f">More...</a><br/></td></tr>
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<tr class="memitem:ad9a7d3170ecf720e1b22a4f255605748"><td class="memItemLeft" align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#ad9a7d3170ecf720e1b22a4f255605748">census_context_serialize</a> (const <a class="el" href="structcensus__context.html">census_context</a> *context, char *buffer, size_t buf_size)</td></tr>
<tr class="separator:ad9a7d3170ecf720e1b22a4f255605748"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:afeb62854542a09290181209ea72b9158"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#afeb62854542a09290181209ea72b9158">census_trace_mask</a> (const <a class="el" href="structcensus__context.html">census_context</a> *context)</td></tr>
<tr class="memdesc:afeb62854542a09290181209ea72b9158"><td class="mdescLeft"> </td><td class="mdescRight">Get the current trace mask associated with this context. <a href="#afeb62854542a09290181209ea72b9158">More...</a><br/></td></tr>
<tr class="separator:afeb62854542a09290181209ea72b9158"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a2762b05c4e9bb8a6994519725cb69a84"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a2762b05c4e9bb8a6994519725cb69a84">census_set_trace_mask</a> (int trace_mask)</td></tr>
<tr class="memdesc:a2762b05c4e9bb8a6994519725cb69a84"><td class="mdescLeft"> </td><td class="mdescRight">Set the trace mask associated with a context. <a href="#a2762b05c4e9bb8a6994519725cb69a84">More...</a><br/></td></tr>
<tr class="separator:a2762b05c4e9bb8a6994519725cb69a84"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a71b2afd7a1663c2a716af7242895442b"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structcensus__timestamp.html">census_timestamp</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a71b2afd7a1663c2a716af7242895442b">census_start_rpc_op_timestamp</a> (void)</td></tr>
<tr class="memdesc:a71b2afd7a1663c2a716af7242895442b"><td class="mdescLeft"> </td><td class="mdescRight">Mark the beginning of an RPC operation. <a href="#a71b2afd7a1663c2a716af7242895442b">More...</a><br/></td></tr>
<tr class="separator:a71b2afd7a1663c2a716af7242895442b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a0f2a69b151eac68f3c50806d2162d9f4"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structcensus__context.html">census_context</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a0f2a69b151eac68f3c50806d2162d9f4">census_start_client_rpc_op</a> (const <a class="el" href="structcensus__context.html">census_context</a> *context, <a class="el" href="port__platform_8h.html#a71edab4bc3421f129764e5cb342f7181">gpr_int64</a> rpc_name_id, const <a class="el" href="structcensus__rpc__name__info.html">census_rpc_name_info</a> *rpc_name_info, const char *peer, int trace_mask, const <a class="el" href="structcensus__timestamp.html">census_timestamp</a> *start_time)</td></tr>
<tr class="memdesc:a0f2a69b151eac68f3c50806d2162d9f4"><td class="mdescLeft"> </td><td class="mdescRight">Start a client rpc operation. <a href="#a0f2a69b151eac68f3c50806d2162d9f4">More...</a><br/></td></tr>
<tr class="separator:a0f2a69b151eac68f3c50806d2162d9f4"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a06407a753c261626b4e25c4f6fe0b840"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a06407a753c261626b4e25c4f6fe0b840">census_set_rpc_client_peer</a> (<a class="el" href="structcensus__context.html">census_context</a> *context, const char *peer)</td></tr>
<tr class="memdesc:a06407a753c261626b4e25c4f6fe0b840"><td class="mdescLeft"> </td><td class="mdescRight">Add peer information to a context representing a client RPC operation. <a href="#a06407a753c261626b4e25c4f6fe0b840">More...</a><br/></td></tr>
<tr class="separator:a06407a753c261626b4e25c4f6fe0b840"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ab7014fb10de411a91588f05658148177"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structcensus__context.html">census_context</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#ab7014fb10de411a91588f05658148177">census_start_server_rpc_op</a> (const char *buffer, <a class="el" href="port__platform_8h.html#a71edab4bc3421f129764e5cb342f7181">gpr_int64</a> rpc_name_id, const <a class="el" href="structcensus__rpc__name__info.html">census_rpc_name_info</a> *rpc_name_info, const char *peer, int trace_mask, <a class="el" href="structcensus__timestamp.html">census_timestamp</a> *start_time)</td></tr>
<tr class="memdesc:ab7014fb10de411a91588f05658148177"><td class="mdescLeft"> </td><td class="mdescRight">Start a server RPC operation. <a href="#ab7014fb10de411a91588f05658148177">More...</a><br/></td></tr>
<tr class="separator:ab7014fb10de411a91588f05658148177"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a14287fdb8adc322c1801435eb121e642"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structcensus__context.html">census_context</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a14287fdb8adc322c1801435eb121e642">census_start_op</a> (<a class="el" href="structcensus__context.html">census_context</a> *context, const char *family, const char *name, int trace_mask)</td></tr>
<tr class="memdesc:a14287fdb8adc322c1801435eb121e642"><td class="mdescLeft"> </td><td class="mdescRight">Start a new, non-RPC operation. <a href="#a14287fdb8adc322c1801435eb121e642">More...</a><br/></td></tr>
<tr class="separator:a14287fdb8adc322c1801435eb121e642"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a97a3300020cdacd7149e0efae9f5541e"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a97a3300020cdacd7149e0efae9f5541e">census_end_op</a> (<a class="el" href="structcensus__context.html">census_context</a> *context, int status)</td></tr>
<tr class="memdesc:a97a3300020cdacd7149e0efae9f5541e"><td class="mdescLeft"> </td><td class="mdescRight">End an operation started by any of the census_start_*_op*() calls. <a href="#a97a3300020cdacd7149e0efae9f5541e">More...</a><br/></td></tr>
<tr class="separator:a97a3300020cdacd7149e0efae9f5541e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:af3822f36fcbca23a3af9d3e8b3fb3317"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#af3822f36fcbca23a3af9d3e8b3fb3317">census_trace_print</a> (<a class="el" href="structcensus__context.html">census_context</a> *context, <a class="el" href="port__platform_8h.html#aa6abd4df815a5498d1a04b5e691a74a9">gpr_uint32</a> type, const char *buffer, size_t n)</td></tr>
<tr class="memdesc:af3822f36fcbca23a3af9d3e8b3fb3317"><td class="mdescLeft"> </td><td class="mdescRight">Insert a trace record into the trace stream. <a href="#af3822f36fcbca23a3af9d3e8b3fb3317">More...</a><br/></td></tr>
<tr class="separator:af3822f36fcbca23a3af9d3e8b3fb3317"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ab93305c7e6b04cd51f95aa497227f53a"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#ab93305c7e6b04cd51f95aa497227f53a">census_trace_scan_start</a> (int consume)</td></tr>
<tr class="memdesc:ab93305c7e6b04cd51f95aa497227f53a"><td class="mdescLeft"> </td><td class="mdescRight">Start a scan of existing trace records. <a href="#ab93305c7e6b04cd51f95aa497227f53a">More...</a><br/></td></tr>
<tr class="separator:ab93305c7e6b04cd51f95aa497227f53a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a31151a1bca352d6046e6039fa864808c"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a31151a1bca352d6046e6039fa864808c">census_get_trace_record</a> (<a class="el" href="structcensus__trace__record.html">census_trace_record</a> *trace_record)</td></tr>
<tr class="memdesc:a31151a1bca352d6046e6039fa864808c"><td class="mdescLeft"> </td><td class="mdescRight">Get a trace record. <a href="#a31151a1bca352d6046e6039fa864808c">More...</a><br/></td></tr>
<tr class="separator:a31151a1bca352d6046e6039fa864808c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:adee01ffd0c56ca2c8c90919a73c3f8ba"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#adee01ffd0c56ca2c8c90919a73c3f8ba">census_trace_scan_end</a> ()</td></tr>
<tr class="memdesc:adee01ffd0c56ca2c8c90919a73c3f8ba"><td class="mdescLeft"> </td><td class="mdescRight">End a scan previously started by <a class="el" href="census_8h.html#ab93305c7e6b04cd51f95aa497227f53a" title="Start a scan of existing trace records. ">census_trace_scan_start()</a> <a href="#adee01ffd0c56ca2c8c90919a73c3f8ba">More...</a><br/></td></tr>
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<tr class="memitem:a14f21902360aa221e6307cec05a110a5"><td class="memItemLeft" align="right" valign="top"><a class="el" href="census_8h.html#afc68a73849e0d1565e74c28c822bb086">census_tag_set</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a14f21902360aa221e6307cec05a110a5">census_tag_set_create</a> (size_t size_hint)</td></tr>
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<tr class="memitem:ac690af8a7c06c6fb152fc9b0b8efc142"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#ac690af8a7c06c6fb152fc9b0b8efc142">census_tag_set_add</a> (<a class="el" href="census_8h.html#afc68a73849e0d1565e74c28c822bb086">census_tag_set</a> *tags, const char *<a class="el" href="hpack__table_8c.html#acd3d88da3c0e0313c3645ff34f62f542">key</a>, const char *<a class="el" href="hpack__table_8c.html#a8556878012feffc9e0beb86cd78f424d">value</a>)</td></tr>
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<tr class="memitem:a07ccf6250c7e2d4ef7180c510fd68ab2"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a07ccf6250c7e2d4ef7180c510fd68ab2">census_tag_set_destroy</a> (<a class="el" href="census_8h.html#afc68a73849e0d1565e74c28c822bb086">census_tag_set</a> *tags)</td></tr>
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<tr class="memitem:a78ec7fa52ea54e631bb11d59a8adba33"><td class="memItemLeft" align="right" valign="top"><a class="el" href="census_8h.html#afc68a73849e0d1565e74c28c822bb086">census_tag_set</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a78ec7fa52ea54e631bb11d59a8adba33">census_context_tag_set</a> (<a class="el" href="structcensus__context.html">census_context</a> *context)</td></tr>
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<tr class="memitem:aae5c38cb581600a401d1f8dca741bf63"><td class="memItemLeft" align="right" valign="top"><a class="el" href="census_8h.html#a22a740b7e9e3798cb9208b3bd6ea31a7">census_tag_set_iterator</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#aae5c38cb581600a401d1f8dca741bf63">census_tag_set_open</a> (<a class="el" href="census_8h.html#afc68a73849e0d1565e74c28c822bb086">census_tag_set</a> *tags)</td></tr>
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<tr class="memitem:a03847b518034c5c3b801fdd95569f400"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a03847b518034c5c3b801fdd95569f400">census_tag_set_next</a> (<a class="el" href="census_8h.html#a22a740b7e9e3798cb9208b3bd6ea31a7">census_tag_set_iterator</a> *it, <a class="el" href="structcensus__tag__const.html">census_tag_const</a> *tag)</td></tr>
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<tr class="memitem:acbca4449a68fd3e2c17f1e0bcf1e663a"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#acbca4449a68fd3e2c17f1e0bcf1e663a">census_tag_set_close</a> (<a class="el" href="census_8h.html#a22a740b7e9e3798cb9208b3bd6ea31a7">census_tag_set_iterator</a> *it)</td></tr>
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<tr class="memitem:a1225e8bbc14ff51173b6485940940572"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a1225e8bbc14ff51173b6485940940572">census_record_values</a> (<a class="el" href="structcensus__context.html">census_context</a> *context, <a class="el" href="structcensus__value.html">census_value</a> *values, size_t nvalues)</td></tr>
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<tr class="memitem:a3bf772ddda26227f485b375192af85f2"><td class="memItemLeft" align="right" valign="top"><a class="el" href="census_8h.html#ae43cfb236f1c79eeefb4d9bdf91e3aed">census_view</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a3bf772ddda26227f485b375192af85f2">census_view_create</a> (<a class="el" href="port__platform_8h.html#aa6abd4df815a5498d1a04b5e691a74a9">gpr_uint32</a> metric_id, const <a class="el" href="census_8h.html#afc68a73849e0d1565e74c28c822bb086">census_tag_set</a> *tags, const <a class="el" href="structcensus__aggregation.html">census_aggregation</a> *aggregations, size_t naggregations)</td></tr>
<tr class="memdesc:a3bf772ddda26227f485b375192af85f2"><td class="mdescLeft"> </td><td class="mdescRight">Create a new view. <a href="#a3bf772ddda26227f485b375192af85f2">More...</a><br/></td></tr>
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<tr class="memitem:a529bb89984b69da3b4cab9deb68175a9"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a529bb89984b69da3b4cab9deb68175a9">census_view_delete</a> (<a class="el" href="census_8h.html#ae43cfb236f1c79eeefb4d9bdf91e3aed">census_view</a> *view)</td></tr>
<tr class="memdesc:a529bb89984b69da3b4cab9deb68175a9"><td class="mdescLeft"> </td><td class="mdescRight">Destroy a previously created view. <a href="#a529bb89984b69da3b4cab9deb68175a9">More...</a><br/></td></tr>
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<tr class="memitem:aa5741f85edf5b3e72f89797ae85463b0"><td class="memItemLeft" align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#aa5741f85edf5b3e72f89797ae85463b0">census_view_metric</a> (const <a class="el" href="census_8h.html#ae43cfb236f1c79eeefb4d9bdf91e3aed">census_view</a> *view)</td></tr>
<tr class="memdesc:aa5741f85edf5b3e72f89797ae85463b0"><td class="mdescLeft"> </td><td class="mdescRight">Metric ID associated with a view. <a href="#aa5741f85edf5b3e72f89797ae85463b0">More...</a><br/></td></tr>
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<tr class="memitem:ac993f47fe73f67e5f8c8f4b00c358144"><td class="memItemLeft" align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#ac993f47fe73f67e5f8c8f4b00c358144">census_view_naggregations</a> (const <a class="el" href="census_8h.html#ae43cfb236f1c79eeefb4d9bdf91e3aed">census_view</a> *view)</td></tr>
<tr class="memdesc:ac993f47fe73f67e5f8c8f4b00c358144"><td class="mdescLeft"> </td><td class="mdescRight">Number of aggregations associated with view. <a href="#ac993f47fe73f67e5f8c8f4b00c358144">More...</a><br/></td></tr>
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<tr class="memitem:a054543816f063d003a36316fda4547b8"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="census_8h.html#afc68a73849e0d1565e74c28c822bb086">census_tag_set</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a054543816f063d003a36316fda4547b8">census_view_tags</a> (const <a class="el" href="census_8h.html#ae43cfb236f1c79eeefb4d9bdf91e3aed">census_view</a> *view)</td></tr>
<tr class="memdesc:a054543816f063d003a36316fda4547b8"><td class="mdescLeft"> </td><td class="mdescRight">Get tags associated with view. <a href="#a054543816f063d003a36316fda4547b8">More...</a><br/></td></tr>
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<tr class="memitem:ab40a6a544d107b067eb5ca8326efeded"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="structcensus__aggregation.html">census_aggregation</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#ab40a6a544d107b067eb5ca8326efeded">census_view_aggregrations</a> (const <a class="el" href="census_8h.html#ae43cfb236f1c79eeefb4d9bdf91e3aed">census_view</a> *view)</td></tr>
<tr class="memdesc:ab40a6a544d107b067eb5ca8326efeded"><td class="mdescLeft"> </td><td class="mdescRight">Get aggregation descriptors associated with a view. <a href="#ab40a6a544d107b067eb5ca8326efeded">More...</a><br/></td></tr>
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<tr class="memitem:ab7146edc8582fe2e6dc537f006e29cc5"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="structcensus__view__data.html">census_view_data</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#ab7146edc8582fe2e6dc537f006e29cc5">census_view_get_data</a> (const <a class="el" href="census_8h.html#ae43cfb236f1c79eeefb4d9bdf91e3aed">census_view</a> *view)</td></tr>
<tr class="memdesc:ab7146edc8582fe2e6dc537f006e29cc5"><td class="mdescLeft"> </td><td class="mdescRight">Get data from aggregations associated with a view. <a href="#ab7146edc8582fe2e6dc537f006e29cc5">More...</a><br/></td></tr>
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<tr class="memitem:ad150387e14628665613f1d9a3d27a418"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#ad150387e14628665613f1d9a3d27a418">census_view_reset</a> (<a class="el" href="census_8h.html#ae43cfb236f1c79eeefb4d9bdf91e3aed">census_view</a> *view)</td></tr>
<tr class="memdesc:ad150387e14628665613f1d9a3d27a418"><td class="mdescLeft"> </td><td class="mdescRight">Reset all view data to zero for the specified view. <a href="#ad150387e14628665613f1d9a3d27a418">More...</a><br/></td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="var-members"></a>
Variables</h2></td></tr>
<tr class="memitem:a35d6ca1b9557bb6e12d79e137a5df944"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structcensus__aggregation__ops.html">census_aggregation_ops</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a35d6ca1b9557bb6e12d79e137a5df944">census_agg_sum</a></td></tr>
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<tr class="memitem:a37ac21fb6ba91fc1f80523cf3d55dbfa"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structcensus__aggregation__ops.html">census_aggregation_ops</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a37ac21fb6ba91fc1f80523cf3d55dbfa">census_agg_distribution</a></td></tr>
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<tr class="memitem:a22bfed34d03c9f9f061f7aaf5fc5378c"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structcensus__aggregation__ops.html">census_aggregation_ops</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a22bfed34d03c9f9f061f7aaf5fc5378c">census_agg_histogram</a></td></tr>
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<tr class="memitem:a4b8a7f096dcd85c93f823cddb2bf960e"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structcensus__aggregation__ops.html">census_aggregation_ops</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="census_8h.html#a4b8a7f096dcd85c93f823cddb2bf960e">census_agg_window</a></td></tr>
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<h2 class="groupheader">Macro Definition Documentation</h2>
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<td class="memname">#define CENSUS_MAX_TAG_KEY_LENGTH   20</td>
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<td class="memname">#define CENSUS_MAX_TAG_VALUE_LENGTH   50</td>
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<td class="memname">#define CENSUS_TRACE_RECORD_END_OP   ((<a class="el" href="port__platform_8h.html#aa6abd4df815a5498d1a04b5e691a74a9">gpr_uint32</a>)1)</td>
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<td class="memname">#define CENSUS_TRACE_RECORD_START_OP   ((<a class="el" href="port__platform_8h.html#aa6abd4df815a5498d1a04b5e691a74a9">gpr_uint32</a>)0)</td>
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<h2 class="groupheader">Typedef Documentation</h2>
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<td class="memname">typedef struct <a class="el" href="structcensus__aggregation__ops.html">census_aggregation_ops</a> <a class="el" href="structcensus__aggregation__ops.html">census_aggregation_ops</a></td>
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<p>Type representing a particular aggregation. </p>
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<td class="memname">typedef struct <a class="el" href="structcensus__context.html">census_context</a> <a class="el" href="structcensus__context.html">census_context</a></td>
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<p>Context is a handle used by census to represent the current tracing and tagging information. </p>
<p>Contexts should be propagated across RPC's. Contexts are created by any of the census_start_*_op() functions. A context is typically used as argument to most census functions. Conceptually, contexts should be thought of as specific to single RPC/thread. The context can be serialized for passing across the wire, via <a class="el" href="census_8h.html#ad9a7d3170ecf720e1b22a4f255605748">census_context_serialize()</a>. </p>
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<td class="memname">typedef struct <a class="el" href="census_8h.html#afc68a73849e0d1565e74c28c822bb086">census_tag_set</a> <a class="el" href="census_8h.html#afc68a73849e0d1565e74c28c822bb086">census_tag_set</a></td>
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<td class="memname">typedef struct <a class="el" href="census_8h.html#a22a740b7e9e3798cb9208b3bd6ea31a7">census_tag_set_iterator</a> <a class="el" href="census_8h.html#a22a740b7e9e3798cb9208b3bd6ea31a7">census_tag_set_iterator</a></td>
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<td class="memname">typedef struct <a class="el" href="census_8h.html#ae43cfb236f1c79eeefb4d9bdf91e3aed">census_view</a> <a class="el" href="census_8h.html#ae43cfb236f1c79eeefb4d9bdf91e3aed">census_view</a></td>
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<p>A census view type. </p>
<p>Opaque. </p>
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<h2 class="groupheader">Enumeration Type Documentation</h2>
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<td class="memname">enum <a class="el" href="census_8h.html#abe92e59c22481b0de3742673cbbb1bf8">census_features</a></td>
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<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><em><a class="anchor" id="abe92e59c22481b0de3742673cbbb1bf8aac1986834f37851b8d899c4a08c8e3ab"></a>CENSUS_FEATURE_NONE</em> </td><td class="fielddoc">
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<tr><td class="fieldname"><em><a class="anchor" id="abe92e59c22481b0de3742673cbbb1bf8ab0722326e730113d5be97f643c3e6718"></a>CENSUS_FEATURE_TRACING</em> </td><td class="fielddoc">
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<tr><td class="fieldname"><em><a class="anchor" id="abe92e59c22481b0de3742673cbbb1bf8a84c772b868e53ee3487c7bfc8e8b2f1a"></a>CENSUS_FEATURE_STATS</em> </td><td class="fielddoc">
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<tr><td class="fieldname"><em><a class="anchor" id="abe92e59c22481b0de3742673cbbb1bf8a4808bff624e2377596b86a6f58ab04b5"></a>CENSUS_FEATURE_CPU</em> </td><td class="fielddoc">
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<tr><td class="fieldname"><em><a class="anchor" id="abe92e59c22481b0de3742673cbbb1bf8aba96a94fb7af8cf1144ca14edc0b1f0c"></a>CENSUS_FEATURE_ALL</em> </td><td class="fielddoc">
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<td class="memname">enum <a class="el" href="census_8h.html#ad4ff7b1db813ee5318871121bb4281cc">census_trace_mask_values</a></td>
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<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><em><a class="anchor" id="ad4ff7b1db813ee5318871121bb4281cca21afa23a531e5d54e70d44ec3c18cfb3"></a>CENSUS_TRACE_MASK_NONE</em> </td><td class="fielddoc">
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<tr><td class="fieldname"><em><a class="anchor" id="ad4ff7b1db813ee5318871121bb4281ccaadcf28b76de06181051506c96996255a"></a>CENSUS_TRACE_MASK_IS_SAMPLED</em> </td><td class="fielddoc">
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<h2 class="groupheader">Function Documentation</h2>
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<td class="memname">size_t census_context_serialize </td>
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<td class="paramtype">const <a class="el" href="structcensus__context.html">census_context</a> * </td>
<td class="paramname"><em>context</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">char * </td>
<td class="paramname"><em>buffer</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>buf_size</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<td class="memname"><a class="el" href="census_8h.html#afc68a73849e0d1565e74c28c822bb086">census_tag_set</a>* census_context_tag_set </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structcensus__context.html">census_context</a> * </td>
<td class="paramname"><em>context</em></td><td>)</td>
<td></td>
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<td class="memname">int census_enabled </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
<td></td>
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<p>Return the census features currently enabled. </p>
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<td class="memname">void census_end_op </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structcensus__context.html">census_context</a> * </td>
<td class="paramname"><em>context</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>status</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>End an operation started by any of the census_start_*_op*() calls. </p>
<p>The context used in this call will no longer be valid once this function completes.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">context</td><td>Context associated with operation which is ending. </td></tr>
<tr><td class="paramname">status</td><td>status associated with the operation. Not interpreted by census. </td></tr>
</table>
</dd>
</dl>
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<td class="memname">int census_get_trace_record </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structcensus__trace__record.html">census_trace_record</a> * </td>
<td class="paramname"><em>trace_record</em></td><td>)</td>
<td></td>
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<p>Get a trace record. </p>
<p>The data pointed to by the trace buffer is guaranteed stable until the next <a class="el" href="census_8h.html#a31151a1bca352d6046e6039fa864808c" title="Get a trace record. ">census_get_trace_record()</a> call (if the consume argument to census_trace_scan_start was non-zero) or <a class="el" href="census_8h.html#adee01ffd0c56ca2c8c90919a73c3f8ba" title="End a scan previously started by census_trace_scan_start() ">census_trace_scan_end()</a> is called (otherwise). </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">trace_record</td><td>structure that will be filled in with oldest trace record. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>-1 if an error occurred (e.g. no previous call to <a class="el" href="census_8h.html#ab93305c7e6b04cd51f95aa497227f53a" title="Start a scan of existing trace records. ">census_trace_scan_start()</a>), 0 if there is no more trace data (and trace_record will not be modified) or 1 otherwise. </dd></dl>
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<td class="memname">int census_initialize </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"><em>features</em></td><td>)</td>
<td></td>
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<p>Shutdown and startup census subsystem. </p>
<p>The 'features' argument should be the OR (|) of census_features values. If census fails to initialize, then <a class="el" href="census_8h.html#a4cea92157f3de215724f6bf4aeaee1b6" title="Shutdown and startup census subsystem. ">census_initialize()</a> will return a non-zero value. It is an error to call <a class="el" href="census_8h.html#a4cea92157f3de215724f6bf4aeaee1b6" title="Shutdown and startup census subsystem. ">census_initialize()</a> more than once (without an intervening <a class="el" href="census_8h.html#aa792b067548ecdd987d560b492c83d85">census_shutdown()</a>). </p>
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<td class="memname">void census_record_values </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structcensus__context.html">census_context</a> * </td>
<td class="paramname"><em>context</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structcensus__value.html">census_value</a> * </td>
<td class="paramname"><em>values</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>nvalues</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
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<td class="memname">void census_set_rpc_client_peer </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structcensus__context.html">census_context</a> * </td>
<td class="paramname"><em>context</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>peer</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
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<p>Add peer information to a context representing a client RPC operation. </p>
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<td class="memname">void census_set_trace_mask </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"><em>trace_mask</em></td><td>)</td>
<td></td>
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<p>Set the trace mask associated with a context. </p>
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<td class="memname">void census_shutdown </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
<td></td>
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<td class="memname"><a class="el" href="structcensus__context.html">census_context</a>* census_start_client_rpc_op </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structcensus__context.html">census_context</a> * </td>
<td class="paramname"><em>context</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="port__platform_8h.html#a71edab4bc3421f129764e5cb342f7181">gpr_int64</a> </td>
<td class="paramname"><em>rpc_name_id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="structcensus__rpc__name__info.html">census_rpc_name_info</a> * </td>
<td class="paramname"><em>rpc_name_info</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>peer</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>trace_mask</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="structcensus__timestamp.html">census_timestamp</a> * </td>
<td class="paramname"><em>start_time</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
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<p>Start a client rpc operation. </p>
<p>This function should be called as early in the client RPC path as possible. This function will create a new context. If the context argument is non-null, then the new context will inherit all its properties, with the following changes:</p>
<ul>
<li>create a new operation ID for the new context, marking it as a child of the previous operation.</li>
<li>use the new RPC path and peer information for tracing and stats collection purposes, rather than those from the original context</li>
</ul>
<p>If the context argument is NULL, then a new root context is created. This is particularly important for tracing purposes (the trace spans generated will be unassociated with any other trace spans, except those downstream). The trace_mask will be used for tracing operations associated with the new context.</p>
<p>In some RPC systems (e.g. where load balancing is used), peer information may not be available at the time the operation starts. In this case, use a NULL value for peer, and set it later using the <a class="el" href="census_8h.html#a06407a753c261626b4e25c4f6fe0b840" title="Add peer information to a context representing a client RPC operation. ">census_set_rpc_client_peer()</a> function.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">context</td><td>The parent context. Can be NULL. </td></tr>
<tr><td class="paramname">rpc_name_id</td><td>The rpc name identifier to be associated with this RPC. </td></tr>
<tr><td class="paramname">rpc_name_info</td><td>Used to decode rpc_name_id. </td></tr>
<tr><td class="paramname">peer</td><td>RPC peer. If not available at the time, NULL can be used, and a later <a class="el" href="census_8h.html#a06407a753c261626b4e25c4f6fe0b840" title="Add peer information to a context representing a client RPC operation. ">census_set_rpc_client_peer()</a> call made. </td></tr>
<tr><td class="paramname">trace_mask</td><td>An OR of census_trace_mask_values values. Only used in the creation of a new root context (context == NULL). </td></tr>
<tr><td class="paramname">start_time</td><td>A timestamp returned from <a class="el" href="census_8h.html#a71b2afd7a1663c2a716af7242895442b" title="Mark the beginning of an RPC operation. ">census_start_rpc_op_timestamp()</a>. Can be NULL. Used to set the true time the operation begins.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>A new census context. </dd></dl>
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<td class="memname"><a class="el" href="structcensus__context.html">census_context</a>* census_start_op </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structcensus__context.html">census_context</a> * </td>
<td class="paramname"><em>context</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>family</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>name</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>trace_mask</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>Start a new, non-RPC operation. </p>
<p>In general, this function works very similarly to census_start_client_rpc_op, with the primary difference being the replacement of host/path information with the more generic family/name tags. If the context argument is non-null, then the new context will inherit all its properties, with the following changes:</p>
<ul>
<li>create a new operation ID for the new context, marking it as a child of the previous operation.</li>
<li>use the family and name information for tracing and stats collection purposes, rather than those from the original context</li>
</ul>
<p>If the context argument is NULL, then a new root context is created. This is particularly important for tracing purposes (the trace spans generated will be unassociated with any other trace spans, except those downstream). The trace_mask will be used for tracing operations associated with the new context.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">context</td><td>The base context. Can be NULL. </td></tr>
<tr><td class="paramname">family</td><td>Family name to associate with the trace </td></tr>
<tr><td class="paramname">name</td><td>Name within family to associated with traces/stats </td></tr>
<tr><td class="paramname">trace_mask</td><td>An OR of census_trace_mask_values values. Only used if context is NULL.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>A new census context. </dd></dl>
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<td class="memname"><a class="el" href="structcensus__timestamp.html">census_timestamp</a> census_start_rpc_op_timestamp </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
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<p>Mark the beginning of an RPC operation. </p>
<p>The information required to call the functions to record the start of RPC operations (both client and server) may not be callable at the true start time of the operation, due to information not being available (e.g. the census context data will not be available in a server RPC until at least initial metadata has been processed). To ensure correct CPU accounting and latency recording, RPC systems can call this function to get the timestamp of operation beginning. This can later be used as an argument to census_start_{client,server}_rpc_op(). NB: for correct CPU accounting, the system must guarantee that the same thread is used for all request processing after this function is called.</p>
<dl class="section return"><dt>Returns</dt><dd>A timestamp representing the operation start time. </dd></dl>
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<td class="memname"><a class="el" href="structcensus__context.html">census_context</a>* census_start_server_rpc_op </td>
<td>(</td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>buffer</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="port__platform_8h.html#a71edab4bc3421f129764e5cb342f7181">gpr_int64</a> </td>
<td class="paramname"><em>rpc_name_id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="structcensus__rpc__name__info.html">census_rpc_name_info</a> * </td>
<td class="paramname"><em>rpc_name_info</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>peer</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>trace_mask</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structcensus__timestamp.html">census_timestamp</a> * </td>
<td class="paramname"><em>start_time</em> </td>
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<p>Start a server RPC operation. </p>
<p>Returns a new context to be used in future census calls. If buffer is non-NULL, then the buffer contents should represent the client context, as generated by <a class="el" href="census_8h.html#ad9a7d3170ecf720e1b22a4f255605748">census_context_serialize()</a>. If buffer is NULL, a new root context is created.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">buffer</td><td>Buffer containing bytes output from <a class="el" href="census_8h.html#ad9a7d3170ecf720e1b22a4f255605748">census_context_serialize()</a>. </td></tr>
<tr><td class="paramname">rpc_name_id</td><td>The rpc name identifier to be associated with this RPC. </td></tr>
<tr><td class="paramname">rpc_name_info</td><td>Used to decode rpc_name_id. </td></tr>
<tr><td class="paramname">peer</td><td>RPC peer. </td></tr>
<tr><td class="paramname">trace_mask</td><td>An OR of census_trace_mask_values values. Only used in the creation of a new root context (buffer == NULL). </td></tr>
<tr><td class="paramname">start_time</td><td>A timestamp returned from <a class="el" href="census_8h.html#a71b2afd7a1663c2a716af7242895442b" title="Mark the beginning of an RPC operation. ">census_start_rpc_op_timestamp()</a>. Can be NULL. Used to set the true time the operation begins.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>A new census context. </dd></dl>
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<td class="memname">int census_supported </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
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<p>Return the features supported by the current census implementation (not all features will be available on all platforms). </p>
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<td class="memname">int census_tag_set_add </td>
<td>(</td>
<td class="paramtype"><a class="el" href="census_8h.html#afc68a73849e0d1565e74c28c822bb086">census_tag_set</a> * </td>
<td class="paramname"><em>tags</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>key</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>value</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
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<td class="memname">void census_tag_set_close </td>
<td>(</td>
<td class="paramtype"><a class="el" href="census_8h.html#a22a740b7e9e3798cb9208b3bd6ea31a7">census_tag_set_iterator</a> * </td>
<td class="paramname"><em>it</em></td><td>)</td>
<td></td>
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<td class="memname"><a class="el" href="census_8h.html#afc68a73849e0d1565e74c28c822bb086">census_tag_set</a>* census_tag_set_create </td>
<td>(</td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>size_hint</em></td><td>)</td>
<td></td>
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<td class="memname">void census_tag_set_destroy </td>
<td>(</td>
<td class="paramtype"><a class="el" href="census_8h.html#afc68a73849e0d1565e74c28c822bb086">census_tag_set</a> * </td>
<td class="paramname"><em>tags</em></td><td>)</td>
<td></td>
</tr>
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<td class="memname">int census_tag_set_next </td>
<td>(</td>
<td class="paramtype"><a class="el" href="census_8h.html#a22a740b7e9e3798cb9208b3bd6ea31a7">census_tag_set_iterator</a> * </td>
<td class="paramname"><em>it</em>, </td>
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<td class="paramtype"><a class="el" href="structcensus__tag__const.html">census_tag_const</a> * </td>
<td class="paramname"><em>tag</em> </td>
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<td class="memname"><a class="el" href="census_8h.html#a22a740b7e9e3798cb9208b3bd6ea31a7">census_tag_set_iterator</a>* census_tag_set_open </td>
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<td class="paramtype"><a class="el" href="census_8h.html#afc68a73849e0d1565e74c28c822bb086">census_tag_set</a> * </td>
<td class="paramname"><em>tags</em></td><td>)</td>
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<td class="memname">int census_trace_mask </td>
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<td class="paramtype">const <a class="el" href="structcensus__context.html">census_context</a> * </td>
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<p>Get the current trace mask associated with this context. </p>
<p>The value returned will be the logical or of census_trace_mask_values values. </p>
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<td class="memname">void census_trace_print </td>
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<td class="paramtype"><a class="el" href="structcensus__context.html">census_context</a> * </td>
<td class="paramname"><em>context</em>, </td>
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<td class="paramtype"><a class="el" href="port__platform_8h.html#aa6abd4df815a5498d1a04b5e691a74a9">gpr_uint32</a> </td>
<td class="paramname"><em>type</em>, </td>
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<td class="paramtype">const char * </td>
<td class="paramname"><em>buffer</em>, </td>
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<td class="paramtype">size_t </td>
<td class="paramname"><em>n</em> </td>
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<p>Insert a trace record into the trace stream. </p>
<p>The record consists of an arbitrary size buffer, the size of which is provided in 'n'. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">context</td><td>Trace context </td></tr>
<tr><td class="paramname">type</td><td>User-defined type to associate with trace entry. </td></tr>
<tr><td class="paramname">buffer</td><td>Pointer to buffer to use </td></tr>
<tr><td class="paramname">n</td><td>Number of bytes in buffer </td></tr>
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<td class="memname">void census_trace_scan_end </td>
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<p>End a scan previously started by <a class="el" href="census_8h.html#ab93305c7e6b04cd51f95aa497227f53a" title="Start a scan of existing trace records. ">census_trace_scan_start()</a> </p>
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<td class="memname">int census_trace_scan_start </td>
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<p>Start a scan of existing trace records. </p>
<p>While a scan is ongoing, addition of new trace records will be blocked if the underlying trace buffers fill up, so trace processing systems should endeavor to complete reading as soon as possible. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">consume</td><td>if non-zero, indicates that reading records also "consumes" the previously read record - i.e. releases space in the trace log while scanning is ongoing. </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>0 on success, non-zero on failure (e.g. if a scan is already ongoing) </dd></dl>
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<td class="memname">const <a class="el" href="structcensus__aggregation.html">census_aggregation</a>* census_view_aggregrations </td>
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<td class="paramtype">const <a class="el" href="census_8h.html#ae43cfb236f1c79eeefb4d9bdf91e3aed">census_view</a> * </td>
<td class="paramname"><em>view</em></td><td>)</td>
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<p>Get aggregation descriptors associated with a view. </p>
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<td class="memname"><a class="el" href="census_8h.html#ae43cfb236f1c79eeefb4d9bdf91e3aed">census_view</a>* census_view_create </td>
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<td class="paramtype"><a class="el" href="port__platform_8h.html#aa6abd4df815a5498d1a04b5e691a74a9">gpr_uint32</a> </td>
<td class="paramname"><em>metric_id</em>, </td>
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<td class="paramtype">const <a class="el" href="census_8h.html#afc68a73849e0d1565e74c28c822bb086">census_tag_set</a> * </td>
<td class="paramname"><em>tags</em>, </td>
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<td class="paramtype">const <a class="el" href="structcensus__aggregation.html">census_aggregation</a> * </td>
<td class="paramname"><em>aggregations</em>, </td>
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<td class="paramtype">size_t </td>
<td class="paramname"><em>naggregations</em> </td>
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<p>Create a new view. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">metric_id</td><td>Metric with which this view is associated. </td></tr>
<tr><td class="paramname">tags</td><td>tags that define the view </td></tr>
<tr><td class="paramname">aggregations</td><td>aggregations to associate with the view </td></tr>
<tr><td class="paramname">naggregations</td><td>number of aggregations</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>A new census view </dd></dl>
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<td class="memname">void census_view_delete </td>
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<td class="paramtype"><a class="el" href="census_8h.html#ae43cfb236f1c79eeefb4d9bdf91e3aed">census_view</a> * </td>
<td class="paramname"><em>view</em></td><td>)</td>
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<p>Destroy a previously created view. </p>
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<td class="memname">const <a class="el" href="structcensus__view__data.html">census_view_data</a>* census_view_get_data </td>
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<td class="paramtype">const <a class="el" href="census_8h.html#ae43cfb236f1c79eeefb4d9bdf91e3aed">census_view</a> * </td>
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<p>Get data from aggregations associated with a view. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">view</td><td>View from which to get data. </td></tr>
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</dd>
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<dl class="section return"><dt>Returns</dt><dd>Full set of data for all aggregations for the view. </dd></dl>
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<td class="memname">size_t census_view_metric </td>
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<td class="paramtype">const <a class="el" href="census_8h.html#ae43cfb236f1c79eeefb4d9bdf91e3aed">census_view</a> * </td>
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<p>Metric ID associated with a view. </p>
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<td class="memname">size_t census_view_naggregations </td>
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<td class="paramtype">const <a class="el" href="census_8h.html#ae43cfb236f1c79eeefb4d9bdf91e3aed">census_view</a> * </td>
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<p>Number of aggregations associated with view. </p>
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<td class="memname">void census_view_reset </td>
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<td class="paramtype"><a class="el" href="census_8h.html#ae43cfb236f1c79eeefb4d9bdf91e3aed">census_view</a> * </td>
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<p>Reset all view data to zero for the specified view. </p>
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<td class="memname">const <a class="el" href="census_8h.html#afc68a73849e0d1565e74c28c822bb086">census_tag_set</a>* census_view_tags </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="census_8h.html#ae43cfb236f1c79eeefb4d9bdf91e3aed">census_view</a> * </td>
<td class="paramname"><em>view</em></td><td>)</td>
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<p>Get tags associated with view. </p>
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<h2 class="groupheader">Variable Documentation</h2>
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<td class="memname"><a class="el" href="structcensus__aggregation__ops.html">census_aggregation_ops</a> census_agg_distribution</td>
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<td class="memname"><a class="el" href="structcensus__aggregation__ops.html">census_aggregation_ops</a> census_agg_histogram</td>
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<td class="memname"><a class="el" href="structcensus__aggregation__ops.html">census_aggregation_ops</a> census_agg_sum</td>
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<td class="memname"><a class="el" href="structcensus__aggregation__ops.html">census_aggregation_ops</a> census_agg_window</td>
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