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diff --git a/base/condition_variable_posix.cc b/base/condition_variable_posix.cc
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "base/condition_variable.h"
+
+#include <errno.h>
+#include <sys/time.h>
+
+#include "base/lock.h"
+#include "base/lock_impl.h"
+#include "base/logging.h"
+
+ConditionVariable::ConditionVariable(Lock* user_lock)
+    : user_mutex_(user_lock->lock_impl()->os_lock()) {
+  int rv = pthread_cond_init(&condition_, NULL);
+  DCHECK(rv == 0);
+}
+
+ConditionVariable::~ConditionVariable() {
+  int rv = pthread_cond_destroy(&condition_);
+  DCHECK(rv == 0);
+}
+
+void ConditionVariable::Wait() {
+  int rv = pthread_cond_wait(&condition_, user_mutex_);
+  DCHECK(rv == 0);
+}
+
+void ConditionVariable::TimedWait(const TimeDelta& max_time) {
+  int64 usecs = max_time.InMicroseconds();
+
+  // The timeout argument to pthread_cond_timedwait is in absolute time.
+  struct timeval now;
+  gettimeofday(&now, NULL);
+
+  const int kMicrosPerUnit = 1000000;
+  const int kNanosPerMicro = 1000;
+  const int kNanosPerUnit = kMicrosPerUnit * kNanosPerMicro;
+
+  struct timespec abstime;
+  abstime.tv_sec = now.tv_sec + (usecs / kMicrosPerUnit);
+  abstime.tv_nsec = (now.tv_usec + (usecs % kMicrosPerUnit)) * kNanosPerMicro;
+  abstime.tv_sec += abstime.tv_nsec / kNanosPerUnit;
+  abstime.tv_nsec %= kNanosPerUnit;
+  DCHECK(abstime.tv_sec >= now.tv_sec);  // Overflow paranoia
+
+  int rv = pthread_cond_timedwait(&condition_, user_mutex_, &abstime);
+  DCHECK(rv == 0 || rv == ETIMEDOUT);
+}
+
+void ConditionVariable::Broadcast() {
+  int rv = pthread_cond_broadcast(&condition_);
+  DCHECK(rv == 0);
+}
+
+void ConditionVariable::Signal() {
+  int rv = pthread_cond_signal(&condition_);
+  DCHECK(rv == 0);
+}