You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
83 lines
2.2 KiB
83 lines
2.2 KiB
/*
|
|
* 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
|