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62 lines
1.7 KiB
C++
62 lines
1.7 KiB
C++
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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/synchronization/condition_variable.h"
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#include "base/synchronization/lock.h"
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#include "base/threading/scoped_blocking_call.h"
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#include "base/threading/thread_restrictions.h"
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#include "base/time/time.h"
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namespace base {
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ConditionVariable::ConditionVariable(Lock* user_lock)
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: srwlock_(user_lock->lock_.native_handle())
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#if DCHECK_IS_ON()
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, user_lock_(user_lock)
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#endif
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{
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DCHECK(user_lock);
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InitializeConditionVariable(&cv_);
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}
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ConditionVariable::~ConditionVariable() = default;
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void ConditionVariable::Wait() {
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TimedWait(TimeDelta::FromMilliseconds(INFINITE));
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}
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void ConditionVariable::TimedWait(const TimeDelta& max_time) {
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internal::AssertBaseSyncPrimitivesAllowed();
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ScopedBlockingCall scoped_blocking_call(BlockingType::MAY_BLOCK);
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DWORD timeout = static_cast<DWORD>(max_time.InMilliseconds());
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#if DCHECK_IS_ON()
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user_lock_->CheckHeldAndUnmark();
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#endif
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if (!SleepConditionVariableSRW(&cv_, srwlock_, timeout, 0)) {
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// On failure, we only expect the CV to timeout. Any other error value means
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// that we've unexpectedly woken up.
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// Note that WAIT_TIMEOUT != ERROR_TIMEOUT. WAIT_TIMEOUT is used with the
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// WaitFor* family of functions as a direct return value. ERROR_TIMEOUT is
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// used with GetLastError().
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DCHECK_EQ(static_cast<DWORD>(ERROR_TIMEOUT), GetLastError());
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}
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#if DCHECK_IS_ON()
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user_lock_->CheckUnheldAndMark();
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#endif
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}
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void ConditionVariable::Broadcast() {
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WakeAllConditionVariable(&cv_);
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}
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void ConditionVariable::Signal() {
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WakeConditionVariable(&cv_);
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}
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} // namespace base
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