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-rw-r--r--src/core/client_config/connector.c5
-rw-r--r--src/core/client_config/connector.h4
-rw-r--r--src/core/client_config/subchannel.c48
-rw-r--r--src/core/client_config/subchannel.h21
-rw-r--r--src/core/client_config/subchannel_index.c259
-rw-r--r--src/core/client_config/subchannel_index.h77
6 files changed, 397 insertions, 17 deletions
diff --git a/src/core/client_config/connector.c b/src/core/client_config/connector.c
index 1603ffb8be..aa34aa7fab 100644
--- a/src/core/client_config/connector.c
+++ b/src/core/client_config/connector.c
@@ -1,6 +1,6 @@
/*
*
- * Copyright 2015, Google Inc.
+ * Copyright 2015-2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -33,8 +33,9 @@
#include "src/core/client_config/connector.h"
-void grpc_connector_ref(grpc_connector* connector) {
+grpc_connector* grpc_connector_ref(grpc_connector* connector) {
connector->vtable->ref(connector);
+ return connector;
}
void grpc_connector_unref(grpc_exec_ctx* exec_ctx, grpc_connector* connector) {
diff --git a/src/core/client_config/connector.h b/src/core/client_config/connector.h
index b4482fa2ee..b91eb512c3 100644
--- a/src/core/client_config/connector.h
+++ b/src/core/client_config/connector.h
@@ -1,6 +1,6 @@
/*
*
- * Copyright 2015, Google Inc.
+ * Copyright 2015-2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -81,7 +81,7 @@ struct grpc_connector_vtable {
grpc_connect_out_args *out_args, grpc_closure *notify);
};
-void grpc_connector_ref(grpc_connector *connector);
+grpc_connector *grpc_connector_ref(grpc_connector *connector);
void grpc_connector_unref(grpc_exec_ctx *exec_ctx, grpc_connector *connector);
/** Connect using the connector: max one outstanding call at a time */
void grpc_connector_connect(grpc_exec_ctx *exec_ctx, grpc_connector *connector,
diff --git a/src/core/client_config/subchannel.c b/src/core/client_config/subchannel.c
index 0a996a1e8b..6599c75dba 100644
--- a/src/core/client_config/subchannel.c
+++ b/src/core/client_config/subchannel.c
@@ -36,16 +36,17 @@
#include <string.h>
#include <grpc/support/alloc.h>
+#include <grpc/support/avl.h>
#include "src/core/channel/channel_args.h"
#include "src/core/channel/client_channel.h"
#include "src/core/channel/connected_channel.h"
#include "src/core/client_config/initial_connect_string.h"
+#include "src/core/client_config/subchannel_index.h"
#include "src/core/iomgr/timer.h"
#include "src/core/profiling/timers.h"
#include "src/core/surface/channel.h"
#include "src/core/transport/connectivity_state.h"
-#include "src/core/transport/connectivity_state.h"
#define INTERNAL_REF_BITS 16
#define STRONG_REF_MASK (~(gpr_atm)((1 << INTERNAL_REF_BITS) - 1))
@@ -94,6 +95,8 @@ struct grpc_subchannel {
struct sockaddr *addr;
size_t addr_len;
+ grpc_subchannel_key *key;
+
/** initial string to send to peer */
gpr_slice initial_connect_string;
@@ -207,6 +210,7 @@ static void subchannel_destroy(grpc_exec_ctx *exec_ctx, void *arg,
grpc_connectivity_state_destroy(exec_ctx, &c->state_tracker);
grpc_connector_unref(exec_ctx, c->connector);
grpc_pollset_set_destroy(&c->pollset_set);
+ grpc_subchannel_key_destroy(exec_ctx, c->key);
gpr_free(c);
}
@@ -222,22 +226,42 @@ static gpr_atm ref_mutate(grpc_subchannel *c, gpr_atm delta,
return old_val;
}
-void grpc_subchannel_ref(grpc_subchannel *c GRPC_SUBCHANNEL_REF_EXTRA_ARGS) {
+grpc_subchannel *grpc_subchannel_ref(grpc_subchannel *c
+ GRPC_SUBCHANNEL_REF_EXTRA_ARGS) {
gpr_atm old_refs;
old_refs = ref_mutate(c, (1 << INTERNAL_REF_BITS),
0 REF_MUTATE_PURPOSE("STRONG_REF"));
GPR_ASSERT((old_refs & STRONG_REF_MASK) != 0);
+ return c;
}
-void grpc_subchannel_weak_ref(grpc_subchannel *c
- GRPC_SUBCHANNEL_REF_EXTRA_ARGS) {
+grpc_subchannel *grpc_subchannel_weak_ref(grpc_subchannel *c
+ GRPC_SUBCHANNEL_REF_EXTRA_ARGS) {
gpr_atm old_refs;
old_refs = ref_mutate(c, 1, 0 REF_MUTATE_PURPOSE("WEAK_REF"));
GPR_ASSERT(old_refs != 0);
+ return c;
+}
+
+grpc_subchannel *grpc_subchannel_ref_from_weak_ref(
+ grpc_subchannel *c GRPC_SUBCHANNEL_REF_EXTRA_ARGS) {
+ if (!c) return NULL;
+ for (;;) {
+ gpr_atm old_refs = gpr_atm_acq_load(&c->ref_pair);
+ if (old_refs >= (1 << INTERNAL_REF_BITS)) {
+ gpr_atm new_refs = old_refs + (1 << INTERNAL_REF_BITS);
+ if (gpr_atm_rel_cas(&c->ref_pair, old_refs, new_refs)) {
+ return c;
+ }
+ } else {
+ return NULL;
+ }
+ }
}
static void disconnect(grpc_exec_ctx *exec_ctx, grpc_subchannel *c) {
grpc_connected_subchannel *con;
+ grpc_subchannel_index_unregister(exec_ctx, c->key, c);
gpr_mu_lock(&c->mu);
GPR_ASSERT(!c->disconnected);
c->disconnected = 1;
@@ -276,10 +300,19 @@ static uint32_t random_seed() {
return (uint32_t)(gpr_time_to_millis(gpr_now(GPR_CLOCK_MONOTONIC)));
}
-grpc_subchannel *grpc_subchannel_create(grpc_connector *connector,
+grpc_subchannel *grpc_subchannel_create(grpc_exec_ctx *exec_ctx,
+ grpc_connector *connector,
grpc_subchannel_args *args) {
- grpc_subchannel *c = gpr_malloc(sizeof(*c));
+ grpc_subchannel_key *key = grpc_subchannel_key_create(connector, args);
+ grpc_subchannel *c = grpc_subchannel_index_find(exec_ctx, key);
+ if (c) {
+ grpc_subchannel_key_destroy(exec_ctx, key);
+ return c;
+ }
+
+ c = gpr_malloc(sizeof(*c));
memset(c, 0, sizeof(*c));
+ c->key = key;
gpr_atm_no_barrier_store(&c->ref_pair, 1 << INTERNAL_REF_BITS);
c->connector = connector;
grpc_connector_ref(c->connector);
@@ -305,7 +338,8 @@ grpc_subchannel *grpc_subchannel_create(grpc_connector *connector,
grpc_connectivity_state_init(&c->state_tracker, GRPC_CHANNEL_IDLE,
"subchannel");
gpr_mu_init(&c->mu);
- return c;
+
+ return grpc_subchannel_index_register(exec_ctx, key, c);
}
static void continue_connect(grpc_exec_ctx *exec_ctx, grpc_subchannel *c) {
diff --git a/src/core/client_config/subchannel.h b/src/core/client_config/subchannel.h
index 57c7c9dc67..313e63c75c 100644
--- a/src/core/client_config/subchannel.h
+++ b/src/core/client_config/subchannel.h
@@ -1,6 +1,6 @@
/*
*
- * Copyright 2015, Google Inc.
+ * Copyright 2015-2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -48,6 +48,8 @@ typedef struct grpc_subchannel_args grpc_subchannel_args;
#ifdef GRPC_STREAM_REFCOUNT_DEBUG
#define GRPC_SUBCHANNEL_REF(p, r) \
grpc_subchannel_ref((p), __FILE__, __LINE__, (r))
+#define GRPC_SUBCHANNEL_REF_FROM_WEAK_REF(p, r) \
+ grpc_subchannel_ref_from_weak_ref((p), __FILE__, __LINE__, (r))
#define GRPC_SUBCHANNEL_UNREF(cl, p, r) \
grpc_subchannel_unref((cl), (p), __FILE__, __LINE__, (r))
#define GRPC_SUBCHANNEL_WEAK_REF(p, r) \
@@ -66,6 +68,8 @@ typedef struct grpc_subchannel_args grpc_subchannel_args;
, const char *file, int line, const char *reason
#else
#define GRPC_SUBCHANNEL_REF(p, r) grpc_subchannel_ref((p))
+#define GRPC_SUBCHANNEL_REF_FROM_WEAK_REF(p, r) \
+ grpc_subchannel_ref_from_weak_ref((p))
#define GRPC_SUBCHANNEL_UNREF(cl, p, r) grpc_subchannel_unref((cl), (p))
#define GRPC_SUBCHANNEL_WEAK_REF(p, r) grpc_subchannel_weak_ref((p))
#define GRPC_SUBCHANNEL_WEAK_UNREF(cl, p, r) \
@@ -79,13 +83,15 @@ typedef struct grpc_subchannel_args grpc_subchannel_args;
#define GRPC_SUBCHANNEL_REF_EXTRA_ARGS
#endif
-void grpc_subchannel_ref(grpc_subchannel *channel
- GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
+grpc_subchannel *grpc_subchannel_ref(grpc_subchannel *channel
+ GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
+grpc_subchannel *grpc_subchannel_ref_from_weak_ref(
+ grpc_subchannel *channel GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
void grpc_subchannel_unref(grpc_exec_ctx *exec_ctx,
grpc_subchannel *channel
GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
-void grpc_subchannel_weak_ref(grpc_subchannel *channel
- GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
+grpc_subchannel *grpc_subchannel_weak_ref(grpc_subchannel *channel
+ GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
void grpc_subchannel_weak_unref(grpc_exec_ctx *exec_ctx,
grpc_subchannel *channel
GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
@@ -146,6 +152,8 @@ grpc_call_stack *grpc_subchannel_call_get_call_stack(
grpc_subchannel_call *subchannel_call);
struct grpc_subchannel_args {
+ /* When updating this struct, also update subchannel_index.c */
+
/** Channel filters for this channel - wrapped factories will likely
want to mutate this */
const grpc_channel_filter **filters;
@@ -159,7 +167,8 @@ struct grpc_subchannel_args {
};
/** create a subchannel given a connector */
-grpc_subchannel *grpc_subchannel_create(grpc_connector *connector,
+grpc_subchannel *grpc_subchannel_create(grpc_exec_ctx *exec_ctx,
+ grpc_connector *connector,
grpc_subchannel_args *args);
#endif /* GRPC_INTERNAL_CORE_CLIENT_CONFIG_SUBCHANNEL_H */
diff --git a/src/core/client_config/subchannel_index.c b/src/core/client_config/subchannel_index.c
new file mode 100644
index 0000000000..f78a7fd588
--- /dev/null
+++ b/src/core/client_config/subchannel_index.c
@@ -0,0 +1,259 @@
+//
+//
+// Copyright 2016, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+//
+
+#include "src/core/client_config/subchannel_index.h"
+
+#include <stdbool.h>
+#include <string.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/avl.h>
+#include <grpc/support/tls.h>
+
+#include "src/core/channel/channel_args.h"
+
+// a map of subchannel_key --> subchannel, used for detecting connections
+// to the same destination in order to share them
+static gpr_avl g_subchannel_index;
+
+static gpr_mu g_mu;
+
+struct grpc_subchannel_key {
+ grpc_connector *connector;
+ grpc_subchannel_args args;
+};
+
+GPR_TLS_DECL(subchannel_index_exec_ctx);
+
+static void enter_ctx(grpc_exec_ctx *exec_ctx) {
+ GPR_ASSERT(gpr_tls_get(&subchannel_index_exec_ctx) == 0);
+ gpr_tls_set(&subchannel_index_exec_ctx, (intptr_t)exec_ctx);
+}
+
+static void leave_ctx(grpc_exec_ctx *exec_ctx) {
+ GPR_ASSERT(gpr_tls_get(&subchannel_index_exec_ctx) == (intptr_t)exec_ctx);
+ gpr_tls_set(&subchannel_index_exec_ctx, 0);
+}
+
+static grpc_exec_ctx *current_ctx() {
+ grpc_exec_ctx *c = (grpc_exec_ctx *)gpr_tls_get(&subchannel_index_exec_ctx);
+ GPR_ASSERT(c != NULL);
+ return c;
+}
+
+static grpc_subchannel_key *create_key(
+ grpc_connector *connector, grpc_subchannel_args *args,
+ grpc_channel_args *(*copy_channel_args)(const grpc_channel_args *args)) {
+ grpc_subchannel_key *k = gpr_malloc(sizeof(*k));
+ k->connector = grpc_connector_ref(connector);
+ k->args.filter_count = args->filter_count;
+ k->args.filters = gpr_malloc(sizeof(*k->args.filters) * k->args.filter_count);
+ memcpy((grpc_channel_filter *)k->args.filters, args->filters,
+ sizeof(*k->args.filters) * k->args.filter_count);
+ k->args.addr_len = args->addr_len;
+ k->args.addr = gpr_malloc(args->addr_len);
+ memcpy(k->args.addr, args->addr, k->args.addr_len);
+ k->args.args = copy_channel_args(args->args);
+ return k;
+}
+
+grpc_subchannel_key *grpc_subchannel_key_create(grpc_connector *connector,
+ grpc_subchannel_args *args) {
+ return create_key(connector, args, grpc_channel_args_normalize);
+}
+
+static grpc_subchannel_key *subchannel_key_copy(grpc_subchannel_key *k) {
+ return create_key(k->connector, &k->args, grpc_channel_args_copy);
+}
+
+static int subchannel_key_compare(grpc_subchannel_key *a,
+ grpc_subchannel_key *b) {
+ int c = GPR_ICMP(a->connector, b->connector);
+ if (c != 0) return c;
+ c = GPR_ICMP(a->args.addr_len, b->args.addr_len);
+ if (c != 0) return c;
+ c = GPR_ICMP(a->args.filter_count, b->args.filter_count);
+ if (c != 0) return c;
+ c = memcmp(a->args.addr, b->args.addr, a->args.addr_len);
+ if (c != 0) return c;
+ c = memcmp(a->args.filters, b->args.filters,
+ a->args.filter_count * sizeof(*a->args.filters));
+ return grpc_channel_args_compare(a->args.args, b->args.args);
+}
+
+void grpc_subchannel_key_destroy(grpc_exec_ctx *exec_ctx,
+ grpc_subchannel_key *k) {
+ grpc_connector_unref(exec_ctx, k->connector);
+ gpr_free(k->args.addr);
+ gpr_free((grpc_channel_args *)k->args.filters);
+ grpc_channel_args_destroy((grpc_channel_args *)k->args.args);
+ gpr_free(k);
+}
+
+static void sck_avl_destroy(void *p) {
+ grpc_subchannel_key_destroy(current_ctx(), p);
+}
+
+static void *sck_avl_copy(void *p) { return subchannel_key_copy(p); }
+
+static long sck_avl_compare(void *a, void *b) {
+ return subchannel_key_compare(a, b);
+}
+
+static void scv_avl_destroy(void *p) {
+ GRPC_SUBCHANNEL_WEAK_UNREF(current_ctx(), p, "subchannel_index");
+}
+
+static void *scv_avl_copy(void *p) {
+ GRPC_SUBCHANNEL_WEAK_REF(p, "subchannel_index");
+ return p;
+}
+
+static const gpr_avl_vtable subchannel_avl_vtable = {
+ .destroy_key = sck_avl_destroy,
+ .copy_key = sck_avl_copy,
+ .compare_keys = sck_avl_compare,
+ .destroy_value = scv_avl_destroy,
+ .copy_value = scv_avl_copy};
+
+void grpc_subchannel_index_init(void) {
+ g_subchannel_index = gpr_avl_create(&subchannel_avl_vtable);
+ gpr_mu_init(&g_mu);
+}
+
+void grpc_subchannel_index_shutdown(void) {
+ gpr_mu_destroy(&g_mu);
+ gpr_avl_unref(g_subchannel_index);
+}
+
+grpc_subchannel *grpc_subchannel_index_find(grpc_exec_ctx *exec_ctx,
+ grpc_subchannel_key *key) {
+ enter_ctx(exec_ctx);
+
+ // Lock, and take a reference to the subchannel index.
+ // We don't need to do the search under a lock as avl's are immutable.
+ gpr_mu_lock(&g_mu);
+ gpr_avl index = gpr_avl_ref(g_subchannel_index);
+ gpr_mu_unlock(&g_mu);
+
+ grpc_subchannel *c =
+ GRPC_SUBCHANNEL_REF_FROM_WEAK_REF(gpr_avl_get(index, key), "index_find");
+ gpr_avl_unref(index);
+
+ leave_ctx(exec_ctx);
+ return c;
+}
+
+grpc_subchannel *grpc_subchannel_index_register(grpc_exec_ctx *exec_ctx,
+ grpc_subchannel_key *key,
+ grpc_subchannel *constructed) {
+ enter_ctx(exec_ctx);
+
+ grpc_subchannel *c = NULL;
+
+ while (c == NULL) {
+ // Compare and swap loop:
+ // - take a reference to the current index
+ gpr_mu_lock(&g_mu);
+ gpr_avl index = gpr_avl_ref(g_subchannel_index);
+ gpr_mu_unlock(&g_mu);
+
+ // - Check to see if a subchannel already exists
+ c = gpr_avl_get(index, key);
+ if (c != NULL) {
+ // yes -> we're done
+ GRPC_SUBCHANNEL_WEAK_UNREF(exec_ctx, constructed, "index_register");
+ } else {
+ // no -> update the avl and compare/swap
+ gpr_avl updated =
+ gpr_avl_add(gpr_avl_ref(index), subchannel_key_copy(key),
+ GRPC_SUBCHANNEL_WEAK_REF(constructed, "index_register"));
+
+ // it may happen (but it's expected to be unlikely)
+ // that some other thread has changed the index:
+ // compare/swap here to check that, and retry as necessary
+ gpr_mu_lock(&g_mu);
+ if (index.root == g_subchannel_index.root) {
+ GPR_SWAP(gpr_avl, updated, g_subchannel_index);
+ c = constructed;
+ }
+ gpr_mu_unlock(&g_mu);
+
+ gpr_avl_unref(updated);
+ }
+ gpr_avl_unref(index);
+ }
+
+ leave_ctx(exec_ctx);
+
+ return c;
+}
+
+void grpc_subchannel_index_unregister(grpc_exec_ctx *exec_ctx,
+ grpc_subchannel_key *key,
+ grpc_subchannel *constructed) {
+ enter_ctx(exec_ctx);
+
+ bool done = false;
+ while (!done) {
+ // Compare and swap loop:
+ // - take a reference to the current index
+ gpr_mu_lock(&g_mu);
+ gpr_avl index = gpr_avl_ref(g_subchannel_index);
+ gpr_mu_unlock(&g_mu);
+
+ // Check to see if this key still refers to the previously
+ // registered subchannel
+ grpc_subchannel *c = gpr_avl_get(index, key);
+ if (c != constructed) {
+ gpr_avl_unref(index);
+ break;
+ }
+
+ // compare and swap the update (some other thread may have
+ // mutated the index behind us)
+ gpr_avl updated = gpr_avl_remove(gpr_avl_ref(index), key);
+
+ gpr_mu_lock(&g_mu);
+ if (index.root == g_subchannel_index.root) {
+ GPR_SWAP(gpr_avl, updated, g_subchannel_index);
+ done = true;
+ }
+ gpr_mu_unlock(&g_mu);
+
+ gpr_avl_unref(updated);
+ gpr_avl_unref(index);
+ }
+
+ leave_ctx(exec_ctx);
+}
diff --git a/src/core/client_config/subchannel_index.h b/src/core/client_config/subchannel_index.h
new file mode 100644
index 0000000000..095ef17819
--- /dev/null
+++ b/src/core/client_config/subchannel_index.h
@@ -0,0 +1,77 @@
+/*
+ *
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_INTERNAL_CORE_CLIENT_CONFIG_SUBCHANNEL_INDEX_H
+#define GRPC_INTERNAL_CORE_CLIENT_CONFIG_SUBCHANNEL_INDEX_H
+
+#include "src/core/client_config/connector.h"
+#include "src/core/client_config/subchannel.h"
+
+/** \file Provides an index of active subchannels so that they can be
+ shared amongst channels */
+
+typedef struct grpc_subchannel_key grpc_subchannel_key;
+
+/** Create a key that can be used to uniquely identify a subchannel */
+grpc_subchannel_key *grpc_subchannel_key_create(grpc_connector *con,
+ grpc_subchannel_args *args);
+
+/** Destroy a subchannel key */
+void grpc_subchannel_key_destroy(grpc_exec_ctx *exec_ctx,
+ grpc_subchannel_key *key);
+
+/** Given a subchannel key, find the subchannel registered for it.
+ Returns NULL if no such channel exists.
+ Thread-safe. */
+grpc_subchannel *grpc_subchannel_index_find(grpc_exec_ctx *exec_ctx,
+ grpc_subchannel_key *key);
+
+/** Register a subchannel against a key.
+ Takes ownership of \a constructed.
+ Returns the registered subchannel. This may be different from
+ \a constructed in the case of a registration race. */
+grpc_subchannel *grpc_subchannel_index_register(grpc_exec_ctx *exec_ctx,
+ grpc_subchannel_key *key,
+ grpc_subchannel *constructed);
+
+/** Remove \a constructed as the registered subchannel for \a key. */
+void grpc_subchannel_index_unregister(grpc_exec_ctx *exec_ctx,
+ grpc_subchannel_key *key,
+ grpc_subchannel *constructed);
+
+/** Initialize the subchannel index (global) */
+void grpc_subchannel_index_init(void);
+/** Shutdown the subchannel index (global) */
+void grpc_subchannel_index_shutdown(void);
+
+#endif /* GRPC_INTERNAL_CORE_CLIENT_CONFIG_SUBCHANNEL_INDEX_H */
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-09 05:35:56 +0000