| // Copyright 2011 Google Inc. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| // Author: jmaessen@google.com (Jan Maessen) |
| |
| #include "pagespeed/kernel/thread/pthread_condvar.h" |
| |
| #include <pthread.h> |
| #include <sys/time.h> |
| #include <cerrno> |
| #include <ctime> |
| |
| #include "base/logging.h" |
| #include "pagespeed/kernel/base/basictypes.h" |
| #include "pagespeed/kernel/thread/pthread_mutex.h" |
| #include "pagespeed/kernel/base/timer.h" |
| |
| namespace net_instaweb { |
| |
| PthreadCondvar::~PthreadCondvar() { |
| pthread_cond_destroy(&condvar_); |
| } |
| |
| void PthreadCondvar::Signal() { |
| pthread_cond_signal(&condvar_); |
| } |
| |
| void PthreadCondvar::Broadcast() { |
| pthread_cond_broadcast(&condvar_); |
| } |
| |
| void PthreadCondvar::Wait() { |
| pthread_cond_wait(&condvar_, &mutex_->mutex_); |
| } |
| |
| void PthreadCondvar::TimedWait(int64 timeout_ms) { |
| const int64 kMsNs = Timer::kSecondNs / Timer::kSecondMs; |
| struct timespec timeout; |
| struct timeval current_time; |
| // convert timeout_ms to seconds and ms |
| int64 timeout_sec_incr = timeout_ms / Timer::kSecondMs; |
| timeout_ms %= Timer::kSecondMs; |
| // Figure out current time, compute absolute time for timeout |
| // Carrying ns to s as appropriate. As morlovich notes, we |
| // get *really close* to overflowing a 32-bit tv_nsec here, |
| // so this code should be modified with caution. |
| if (gettimeofday(¤t_time, NULL) != 0) { |
| LOG(FATAL) << "Could not determine time of day"; |
| } |
| timeout.tv_nsec = current_time.tv_usec * 1000 + timeout_ms * kMsNs; |
| timeout_sec_incr += timeout.tv_nsec / Timer::kSecondNs; |
| timeout.tv_nsec %= Timer::kSecondNs; |
| timeout.tv_sec = current_time.tv_sec + static_cast<time_t>(timeout_sec_incr); |
| // Finally we actually get to wait. |
| pthread_cond_timedwait(&condvar_, &mutex_->mutex_, &timeout); |
| } |
| |
| void PthreadCondvar::Init() { |
| while (pthread_cond_init(&condvar_, NULL) == EAGAIN) { } |
| } |
| |
| } // namespace net_instaweb |