Repo created

TMessagesProj/jni/voip/webrtc/base/synchronization/condition_variable_win.cc

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