The Tor Browser: ipc/chromium/src/base/condition_variable

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.

     2 // Use of this source code is governed by a BSD-style license that can be

     3 // found in the LICENSE file.

     5 #include "base/condition_variable.h"

     7 #include <errno.h>

     8 #include <sys/time.h>

    10 #include "base/lock.h"

    11 #include "base/lock_impl.h"

    12 #include "base/logging.h"

    13 #include "base/time.h"

    15 using base::Time;

    16 using base::TimeDelta;

    18 ConditionVariable::ConditionVariable(Lock* user_lock)

    19     : user_mutex_(user_lock->lock_impl()->os_lock()) {

    20   int rv = 0;

    21 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)

    22   pthread_condattr_t attrs;

    23   rv = pthread_condattr_init(&attrs);

    24   DCHECK_EQ(0, rv);

    25   pthread_condattr_setclock(&attrs, CLOCK_MONOTONIC);

    26   rv = pthread_cond_init(&condition_, &attrs);

    27   pthread_condattr_destroy(&attrs);

    28 #else

    29   rv = pthread_cond_init(&condition_, NULL);

    30 #endif

    31   DCHECK_EQ(0, rv);

    32 }

    34 ConditionVariable::~ConditionVariable() {

    35   int rv = pthread_cond_destroy(&condition_);

    36   DCHECK(rv == 0);

    37 }

    39 void ConditionVariable::Wait() {

    40   int rv = pthread_cond_wait(&condition_, user_mutex_);

    41   DCHECK(rv == 0);

    42 }

    44 void ConditionVariable::TimedWait(const TimeDelta& max_time) {

    45   int64_t usecs = max_time.InMicroseconds();

    47   struct timespec relative_time;

    48   relative_time.tv_sec = usecs / Time::kMicrosecondsPerSecond;

    49   relative_time.tv_nsec =

    50       (usecs % Time::kMicrosecondsPerSecond) * Time::kNanosecondsPerMicrosecond;

    52 #if defined(OS_MACOSX)

    53   int rv = pthread_cond_timedwait_relative_np(

    54       &condition_, user_mutex_, &relative_time);

    55 #else

    56   // The timeout argument to pthread_cond_timedwait is in absolute time.

    57   struct timespec now;

    58   clock_gettime(CLOCK_MONOTONIC, &now);

    60   struct timespec absolute_time;

    61   absolute_time.tv_sec = now.tv_sec;

    62   absolute_time.tv_nsec = now.tv_nsec;

    63   absolute_time.tv_sec += relative_time.tv_sec;

    64   absolute_time.tv_nsec += relative_time.tv_nsec;

    65   absolute_time.tv_sec += absolute_time.tv_nsec / Time::kNanosecondsPerSecond;

    66   absolute_time.tv_nsec %= Time::kNanosecondsPerSecond;

    67   DCHECK_GE(absolute_time.tv_sec, now.tv_sec);  // Overflow paranoia

    69 #if defined(OS_ANDROID)

    70   int rv = pthread_cond_timedwait_monotonic_np(

    71       &condition_, user_mutex_, &absolute_time);

    72 #else

    73   int rv = pthread_cond_timedwait(&condition_, user_mutex_, &absolute_time);

    74 #endif  // OS_ANDROID

    75 #endif  // OS_MACOSX

    77   DCHECK(rv == 0 || rv == ETIMEDOUT);

    78 }

    80 void ConditionVariable::Broadcast() {

    81   int rv = pthread_cond_broadcast(&condition_);

    82   DCHECK(rv == 0);

    83 }

    85 void ConditionVariable::Signal() {

    86   int rv = pthread_cond_signal(&condition_);

    87   DCHECK(rv == 0);

    88 }

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