diff options
Diffstat (limited to 'src/core/lib/surface/channel.c')
-rw-r--r-- | src/core/lib/surface/channel.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/core/lib/surface/channel.c b/src/core/lib/surface/channel.c index a00572c007..16208a5ca9 100644 --- a/src/core/lib/surface/channel.c +++ b/src/core/lib/surface/channel.c @@ -68,6 +68,8 @@ struct grpc_channel { grpc_compression_options compression_options; grpc_mdelem default_authority; + gpr_atm call_size_estimate; + gpr_mu registered_call_mu; registered_call *registered_calls; @@ -107,6 +109,10 @@ grpc_channel *grpc_channel_create_with_builder( gpr_mu_init(&channel->registered_call_mu); channel->registered_calls = NULL; + gpr_atm_no_barrier_store( + &channel->call_size_estimate, + (gpr_atm)CHANNEL_STACK_FROM_CHANNEL(channel)->call_stack_size); + grpc_compression_options_init(&channel->compression_options); for (size_t i = 0; i < args->num_args; i++) { if (0 == strcmp(args->args[i].key, GRPC_ARG_DEFAULT_AUTHORITY)) { @@ -186,6 +192,32 @@ grpc_channel *grpc_channel_create(grpc_exec_ctx *exec_ctx, const char *target, channel_stack_type); } +size_t grpc_channel_get_call_size_estimate(grpc_channel *channel) { +#define ROUND_UP_SIZE 256 + return ((size_t)gpr_atm_no_barrier_load(&channel->call_size_estimate) + + ROUND_UP_SIZE) & + ~(size_t)(ROUND_UP_SIZE - 1); +} + +void grpc_channel_update_call_size_estimate(grpc_channel *channel, + size_t size) { + size_t cur = (size_t)gpr_atm_no_barrier_load(&channel->call_size_estimate); + if (cur < size) { + /* size grew: update estimate */ + gpr_atm_no_barrier_cas(&channel->call_size_estimate, (gpr_atm)cur, + (gpr_atm)size); + /* if we lose: never mind, something else will likely update soon enough */ + } else if (cur == size) { + /* no change: holding pattern */ + } else if (cur > 0) { + /* size shrank: decrease estimate */ + gpr_atm_no_barrier_cas( + &channel->call_size_estimate, (gpr_atm)cur, + (gpr_atm)(GPR_MIN(cur - 1, (255 * cur + size) / 256))); + /* if we lose: never mind, something else will likely update soon enough */ + } +} + char *grpc_channel_get_target(grpc_channel *channel) { GRPC_API_TRACE("grpc_channel_get_target(channel=%p)", 1, (channel)); return gpr_strdup(channel->target); |