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Merge pull request grpc#3726 from dgquintas/iomgr_executor
Introducing grpc_executor, for all your threading needs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,148 @@ | ||
| /* | ||
| * | ||
| * Copyright 2015, 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/iomgr/executor.h" | ||
|
|
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| #include <string.h> | ||
|
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| #include <grpc/support/alloc.h> | ||
| #include <grpc/support/log.h> | ||
| #include <grpc/support/sync.h> | ||
| #include <grpc/support/thd.h> | ||
| #include "src/core/iomgr/exec_ctx.h" | ||
|
|
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| typedef struct grpc_executor_data { | ||
| int busy; /**< is the thread currently running? */ | ||
| int shutting_down; /**< has \a grpc_shutdown() been invoked? */ | ||
| int pending_join; /**< has the thread finished but not been joined? */ | ||
| grpc_closure_list closures; /**< collection of pending work */ | ||
| gpr_thd_id tid; /**< thread id of the thread, only valid if \a busy or \a | ||
| pending_join are true */ | ||
| gpr_thd_options options; | ||
| gpr_mu mu; | ||
| } grpc_executor; | ||
|
|
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| static grpc_executor g_executor; | ||
|
|
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| void grpc_executor_init() { | ||
| memset(&g_executor, 0, sizeof(grpc_executor)); | ||
| gpr_mu_init(&g_executor.mu); | ||
| g_executor.options = gpr_thd_options_default(); | ||
| gpr_thd_options_set_joinable(&g_executor.options); | ||
| } | ||
|
|
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| /* thread body */ | ||
| static void closure_exec_thread_func(void *ignored) { | ||
| grpc_closure *closure; | ||
|
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| grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; | ||
| while (1) { | ||
| gpr_mu_lock(&g_executor.mu); | ||
| if (g_executor.shutting_down != 0) { | ||
| gpr_mu_unlock(&g_executor.mu); | ||
| break; | ||
| } | ||
| closure = grpc_closure_list_pop(&g_executor.closures); | ||
| if (closure == NULL) { | ||
| /* no more work, time to die */ | ||
| GPR_ASSERT(g_executor.busy == 1); | ||
| g_executor.busy = 0; | ||
| gpr_mu_unlock(&g_executor.mu); | ||
| break; | ||
| } | ||
| gpr_mu_unlock(&g_executor.mu); | ||
| closure->cb(&exec_ctx, closure->cb_arg, closure->success); | ||
| grpc_exec_ctx_flush(&exec_ctx); | ||
| } | ||
| grpc_exec_ctx_finish(&exec_ctx); | ||
| } | ||
|
|
||
| /* Spawn the thread if new work has arrived a no thread is up */ | ||
| static void maybe_spawn_locked() { | ||
| if (grpc_closure_list_empty(g_executor.closures) == 1) { | ||
| return; | ||
| } | ||
| if (g_executor.shutting_down == 1) { | ||
| return; | ||
| } | ||
|
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| if (g_executor.busy != 0) { | ||
| /* Thread still working. New work will be picked up by already running | ||
| * thread. Not spawning anything. */ | ||
| return; | ||
| } else if (g_executor.pending_join != 0) { | ||
| /* Pickup the remains of the previous incarnations of the thread. */ | ||
| gpr_thd_join(g_executor.tid); | ||
| g_executor.pending_join = 0; | ||
| } | ||
|
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| /* All previous instances of the thread should have been joined at this point. | ||
| * Spawn time! */ | ||
| g_executor.busy = 1; | ||
| gpr_thd_new(&g_executor.tid, closure_exec_thread_func, NULL, | ||
| &g_executor.options); | ||
| g_executor.pending_join = 1; | ||
| } | ||
|
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| void grpc_executor_enqueue(grpc_closure *closure, int success) { | ||
| gpr_mu_lock(&g_executor.mu); | ||
| if (g_executor.shutting_down == 0) { | ||
| grpc_closure_list_add(&g_executor.closures, closure, success); | ||
| maybe_spawn_locked(); | ||
| } | ||
| gpr_mu_unlock(&g_executor.mu); | ||
| } | ||
|
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| void grpc_executor_shutdown() { | ||
| int pending_join; | ||
| grpc_closure *closure; | ||
| grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; | ||
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| gpr_mu_lock(&g_executor.mu); | ||
| pending_join = g_executor.pending_join; | ||
| g_executor.shutting_down = 1; | ||
| gpr_mu_unlock(&g_executor.mu); | ||
| /* we can release the lock at this point despite the access to the closure | ||
| * list below because we aren't accepting new work */ | ||
|
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| /* Execute pending callbacks, some may be performing cleanups */ | ||
| while ((closure = grpc_closure_list_pop(&g_executor.closures)) != NULL) { | ||
| closure->cb(&exec_ctx, closure->cb_arg, closure->success); | ||
| } | ||
| grpc_exec_ctx_finish(&exec_ctx); | ||
| GPR_ASSERT(grpc_closure_list_empty(g_executor.closures)); | ||
| if (pending_join) { | ||
| gpr_thd_join(g_executor.tid); | ||
| } | ||
| gpr_mu_destroy(&g_executor.mu); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| /* | ||
| * | ||
| * Copyright 2015, 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. | ||
| * | ||
| */ | ||
|
|
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| #ifndef GRPC_INTERNAL_CORE_IOMGR_EXECUTOR_H | ||
| #define GRPC_INTERNAL_CORE_IOMGR_EXECUTOR_H | ||
|
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| #include "src/core/iomgr/closure.h" | ||
|
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| /** Initialize the global executor. | ||
| * | ||
| * This mechanism is meant to outsource work (grpc_closure instances) to a | ||
| * thread, for those cases where blocking isn't an option but there isn't a | ||
| * non-blocking solution available. */ | ||
| void grpc_executor_init(); | ||
|
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| /** Enqueue \a closure for its eventual execution of \a f(arg) on a separate | ||
| * thread */ | ||
| void grpc_executor_enqueue(grpc_closure *closure, int success); | ||
|
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| /** Shutdown the executor, running all pending work as part of the call */ | ||
| void grpc_executor_shutdown(); | ||
|
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| #endif /* GRPC_INTERNAL_CORE_IOMGR_EXECUTOR_H */ |
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