1 files changed, 119 insertions, 0 deletions
diff --git a/ipc/chromium/src/base/condition_variable_posix.cc b/ipc/chromium/src/base/condition_variable_posix.cc
new file mode 100644
index 0000000000..891555389e
--- /dev/null
+++ b/ipc/chromium/src/base/condition_variable_posix.cc
@@ -0,0 +1,119 @@
+/* -*- 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 <errno.h>
+#include <stdint.h>
+#include <sys/time.h>
+
+#include "base/lock.h"
+#include "base/logging.h"
+#include "base/time.h"
+#include "build/build_config.h"
+
+ConditionVariable::ConditionVariable(Lock* user_lock)
+    : user_mutex_(user_lock->lock_.native_handle()) {
+  int rv = 0;
+  // http://crbug.com/293736
+  // NaCl doesn't support monotonic clock based absolute deadlines.
+  // On older Android platform versions, it's supported through the
+  // non-standard pthread_cond_timedwait_monotonic_np. Newer platform
+  // versions have pthread_condattr_setclock.
+  // Mac can use relative time deadlines.
+#if !defined(OS_MACOSX) && !defined(OS_NACL) && \
+    !(defined(OS_ANDROID) && defined(HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC))
+  pthread_condattr_t attrs;
+  rv = pthread_condattr_init(&attrs);
+  DCHECK_EQ(0, rv);
+  pthread_condattr_setclock(&attrs, CLOCK_MONOTONIC);
+  rv = pthread_cond_init(&condition_, &attrs);
+  pthread_condattr_destroy(&attrs);
+#else
+  rv = pthread_cond_init(&condition_, NULL);
+#endif
+  DCHECK_EQ(0, rv);
+}
+
+ConditionVariable::~ConditionVariable() {
+#if defined(OS_MACOSX)
+  // This hack is necessary to avoid a fatal pthreads subsystem bug in the
+  // Darwin kernel. http://crbug.com/517681.
+  {
+    Lock lock;
+    AutoLock l(lock);
+    struct timespec ts;
+    ts.tv_sec = 0;
+    ts.tv_nsec = 1;
+    pthread_cond_timedwait_relative_np(&condition_, lock.lock_.native_handle(),
+                                       &ts);
+  }
+#endif
+
+  int rv = pthread_cond_destroy(&condition_);
+  DCHECK_EQ(0, rv);
+}
+
+void ConditionVariable::Wait() {
+  int rv = pthread_cond_wait(&condition_, user_mutex_);
+  DCHECK_EQ(0, rv);
+}
+
+void ConditionVariable::TimedWait(const base::TimeDelta& max_time) {
+  int64_t usecs = max_time.InMicroseconds();
+  struct timespec relative_time;
+  relative_time.tv_sec = usecs / base::Time::kMicrosecondsPerSecond;
+  relative_time.tv_nsec = (usecs % base::Time::kMicrosecondsPerSecond) *
+                          base::Time::kNanosecondsPerMicrosecond;
+
+#if defined(OS_MACOSX)
+  int rv = pthread_cond_timedwait_relative_np(&condition_, user_mutex_,
+                                              &relative_time);
+#else
+  // The timeout argument to pthread_cond_timedwait is in absolute time.
+  struct timespec absolute_time;
+#  if defined(OS_NACL)
+  // See comment in constructor for why this is different in NaCl.
+  struct timeval now;
+  gettimeofday(&now, NULL);
+  absolute_time.tv_sec = now.tv_sec;
+  absolute_time.tv_nsec = now.tv_usec * base::Time::kNanosecondsPerMicrosecond;
+#  else
+  struct timespec now;
+  clock_gettime(CLOCK_MONOTONIC, &now);
+  absolute_time.tv_sec = now.tv_sec;
+  absolute_time.tv_nsec = now.tv_nsec;
+#  endif
+
+  absolute_time.tv_sec += relative_time.tv_sec;
+  absolute_time.tv_nsec += relative_time.tv_nsec;
+  absolute_time.tv_sec +=
+      absolute_time.tv_nsec / base::Time::kNanosecondsPerSecond;
+  absolute_time.tv_nsec %= base::Time::kNanosecondsPerSecond;
+  DCHECK_GE(absolute_time.tv_sec, now.tv_sec);  // Overflow paranoia
+
+#  if defined(OS_ANDROID) && defined(HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC)
+  int rv = pthread_cond_timedwait_monotonic_np(&condition_, user_mutex_,
+                                               &absolute_time);
+#  else
+  int rv = pthread_cond_timedwait(&condition_, user_mutex_, &absolute_time);
+#  endif  // OS_ANDROID && HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC
+#endif    // OS_MACOSX
+
+  // On failure, we only expect the CV to timeout. Any other error value means
+  // that we've unexpectedly woken up.
+  DCHECK(rv == 0 || rv == ETIMEDOUT);
+}
+
+void ConditionVariable::Broadcast() {
+  int rv = pthread_cond_broadcast(&condition_);
+  DCHECK_EQ(0, rv);
+}
+
+void ConditionVariable::Signal() {
+  int rv = pthread_cond_signal(&condition_);
+  DCHECK_EQ(0, rv);
+}