1 files changed, 40 insertions, 0 deletions
diff --git a/ipc/chromium/src/base/condition_variable_win.cc b/ipc/chromium/src/base/condition_variable_win.cc
new file mode 100644
index 0000000000..35d79ba2ec
--- /dev/null
+++ b/ipc/chromium/src/base/condition_variable_win.cc
@@ -0,0 +1,40 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+// 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/condition_variable.h"
+
+#include "base/lock.h"
+#include "base/logging.h"
+#include "base/time.h"
+
+ConditionVariable::ConditionVariable(Lock* user_lock)
+    : srwlock_(user_lock->lock_.native_handle()) {
+  DCHECK(user_lock);
+  InitializeConditionVariable(&cv_);
+}
+
+ConditionVariable::~ConditionVariable() = default;
+
+void ConditionVariable::Wait() {
+  TimedWait(base::TimeDelta::FromMilliseconds(INFINITE));
+}
+
+void ConditionVariable::TimedWait(const base::TimeDelta& max_time) {
+  DWORD timeout = static_cast<DWORD>(max_time.InMilliseconds());
+
+  if (!SleepConditionVariableSRW(&cv_, 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());
+  }
+}
+
+void ConditionVariable::Broadcast() { WakeAllConditionVariable(&cv_); }
+
+void ConditionVariable::Signal() { WakeConditionVariable(&cv_); }