| /* |
| * Copyright 2004 The WebRTC Project Authors. All rights reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #include "webrtc/base/event.h" |
| |
| #if defined(WEBRTC_WIN) |
| #include <windows.h> |
| #elif defined(WEBRTC_POSIX) |
| #include <pthread.h> |
| #include <sys/time.h> |
| #include <time.h> |
| #else |
| #error "Must define either WEBRTC_WIN or WEBRTC_POSIX." |
| #endif |
| |
| #include "webrtc/base/checks.h" |
| |
| namespace rtc { |
| |
| #if defined(WEBRTC_WIN) |
| |
| Event::Event(bool manual_reset, bool initially_signaled) { |
| event_handle_ = ::CreateEvent(NULL, // Security attributes. |
| manual_reset, |
| initially_signaled, |
| NULL); // Name. |
| RTC_CHECK(event_handle_); |
| } |
| |
| Event::~Event() { |
| CloseHandle(event_handle_); |
| } |
| |
| void Event::Set() { |
| SetEvent(event_handle_); |
| } |
| |
| void Event::Reset() { |
| ResetEvent(event_handle_); |
| } |
| |
| bool Event::Wait(int milliseconds) { |
| DWORD ms = (milliseconds == kForever) ? INFINITE : milliseconds; |
| return (WaitForSingleObject(event_handle_, ms) == WAIT_OBJECT_0); |
| } |
| |
| #elif defined(WEBRTC_POSIX) |
| |
| Event::Event(bool manual_reset, bool initially_signaled) |
| : is_manual_reset_(manual_reset), |
| event_status_(initially_signaled) { |
| RTC_CHECK(pthread_mutex_init(&event_mutex_, NULL) == 0); |
| RTC_CHECK(pthread_cond_init(&event_cond_, NULL) == 0); |
| } |
| |
| Event::~Event() { |
| pthread_mutex_destroy(&event_mutex_); |
| pthread_cond_destroy(&event_cond_); |
| } |
| |
| void Event::Set() { |
| pthread_mutex_lock(&event_mutex_); |
| event_status_ = true; |
| pthread_cond_broadcast(&event_cond_); |
| pthread_mutex_unlock(&event_mutex_); |
| } |
| |
| void Event::Reset() { |
| pthread_mutex_lock(&event_mutex_); |
| event_status_ = false; |
| pthread_mutex_unlock(&event_mutex_); |
| } |
| |
| bool Event::Wait(int milliseconds) { |
| int error = 0; |
| |
| struct timespec ts; |
| if (milliseconds != kForever) { |
| // Converting from seconds and microseconds (1e-6) plus |
| // milliseconds (1e-3) to seconds and nanoseconds (1e-9). |
| |
| #if HAVE_PTHREAD_COND_TIMEDWAIT_RELATIVE |
| // Use relative time version, which tends to be more efficient for |
| // pthread implementations where provided (like on Android). |
| ts.tv_sec = milliseconds / 1000; |
| ts.tv_nsec = (milliseconds % 1000) * 1000000; |
| #else |
| struct timeval tv; |
| gettimeofday(&tv, NULL); |
| |
| ts.tv_sec = tv.tv_sec + (milliseconds / 1000); |
| ts.tv_nsec = tv.tv_usec * 1000 + (milliseconds % 1000) * 1000000; |
| |
| // Handle overflow. |
| if (ts.tv_nsec >= 1000000000) { |
| ts.tv_sec++; |
| ts.tv_nsec -= 1000000000; |
| } |
| #endif |
| } |
| |
| pthread_mutex_lock(&event_mutex_); |
| if (milliseconds != kForever) { |
| while (!event_status_ && error == 0) { |
| #if HAVE_PTHREAD_COND_TIMEDWAIT_RELATIVE |
| error = pthread_cond_timedwait_relative_np( |
| &event_cond_, &event_mutex_, &ts); |
| #else |
| error = pthread_cond_timedwait(&event_cond_, &event_mutex_, &ts); |
| #endif |
| } |
| } else { |
| while (!event_status_ && error == 0) |
| error = pthread_cond_wait(&event_cond_, &event_mutex_); |
| } |
| |
| // NOTE(liulk): Exactly one thread will auto-reset this event. All |
| // the other threads will think it's unsignaled. This seems to be |
| // consistent with auto-reset events in WEBRTC_WIN |
| if (error == 0 && !is_manual_reset_) |
| event_status_ = false; |
| |
| pthread_mutex_unlock(&event_mutex_); |
| |
| return (error == 0); |
| } |
| |
| #endif |
| |
| } // namespace rtc |