mirror of
https://github.com/mollyim/webrtc.git
synced 2025-05-13 05:40:42 +01:00
fefa77c426
Emscripten does not support C++11 thread_local but does support the pthread TLS API. Bug: None Change-Id: Ia21895148d1df7652579d086d9e1c0c53d7a85f4 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/145441 Commit-Queue: Steve Anton <steveanton@webrtc.org> Reviewed-by: Sebastian Jansson <srte@webrtc.org> Cr-Commit-Position: refs/heads/master@{#28621}
82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
/*
|
|
* Copyright 2019 The WebRTC project authors. All Rights Reserved.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license
|
|
* that can be found in the LICENSE file in the root of the source
|
|
* tree. An additional intellectual property rights grant can be found
|
|
* in the file PATENTS. All contributing project authors may
|
|
* be found in the AUTHORS file in the root of the source tree.
|
|
*/
|
|
#include "rtc_base/synchronization/yield_policy.h"
|
|
|
|
#include "absl/base/attributes.h"
|
|
#include "absl/base/config.h"
|
|
#include "rtc_base/checks.h"
|
|
#if !defined(ABSL_HAVE_THREAD_LOCAL) && defined(WEBRTC_POSIX)
|
|
#include <pthread.h>
|
|
#endif
|
|
|
|
namespace rtc {
|
|
namespace {
|
|
|
|
#if defined(ABSL_HAVE_THREAD_LOCAL)
|
|
|
|
ABSL_CONST_INIT thread_local YieldInterface* current_yield_policy = nullptr;
|
|
|
|
YieldInterface* GetCurrentYieldPolicy() {
|
|
return current_yield_policy;
|
|
}
|
|
|
|
void SetCurrentYieldPolicy(YieldInterface* ptr) {
|
|
current_yield_policy = ptr;
|
|
}
|
|
|
|
#elif defined(WEBRTC_POSIX)
|
|
|
|
// Emscripten does not support the C++11 thread_local keyword but does support
|
|
// the pthread thread-local storage API.
|
|
// https://github.com/emscripten-core/emscripten/issues/3502
|
|
|
|
ABSL_CONST_INIT pthread_key_t g_current_yield_policy_tls = 0;
|
|
|
|
void InitializeTls() {
|
|
RTC_CHECK_EQ(pthread_key_create(&g_current_yield_policy_tls, nullptr), 0);
|
|
}
|
|
|
|
pthread_key_t GetCurrentYieldPolicyTls() {
|
|
static pthread_once_t init_once = PTHREAD_ONCE_INIT;
|
|
RTC_CHECK_EQ(pthread_once(&init_once, &InitializeTls), 0);
|
|
return g_current_yield_policy_tls;
|
|
}
|
|
|
|
YieldInterface* GetCurrentYieldPolicy() {
|
|
return static_cast<YieldInterface*>(
|
|
pthread_getspecific(GetCurrentYieldPolicyTls()));
|
|
}
|
|
|
|
void SetCurrentYieldPolicy(YieldInterface* ptr) {
|
|
pthread_setspecific(GetCurrentYieldPolicyTls(), ptr);
|
|
}
|
|
|
|
#else
|
|
#error Unsupported platform
|
|
#endif
|
|
|
|
} // namespace
|
|
|
|
ScopedYieldPolicy::ScopedYieldPolicy(YieldInterface* policy)
|
|
: previous_(GetCurrentYieldPolicy()) {
|
|
SetCurrentYieldPolicy(policy);
|
|
}
|
|
|
|
ScopedYieldPolicy::~ScopedYieldPolicy() {
|
|
SetCurrentYieldPolicy(previous_);
|
|
}
|
|
|
|
void ScopedYieldPolicy::YieldExecution() {
|
|
YieldInterface* current = GetCurrentYieldPolicy();
|
|
if (current)
|
|
current->YieldExecution();
|
|
}
|
|
|
|
} // namespace rtc
|