| /* |
| * 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 "rtc_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 "rtc_base/checks.h" |
| |
| namespace rtc { |
| |
| Event::Event() : Event(false, false) {} |
| |
| #if defined(WEBRTC_WIN) |
| |
| Event::Event(bool manual_reset, bool initially_signaled) { |
| event_handle_ = ::CreateEvent(nullptr, // Security attributes. |
| manual_reset, initially_signaled, |
| nullptr); // 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) |
| |
| // On MacOS, clock_gettime is available from version 10.12, and on |
| // iOS, from version 10.0. So we can't use it yet. |
| #if defined(WEBRTC_MAC) || defined(WEBRTC_IOS) |
| #define USE_CLOCK_GETTIME 0 |
| #define USE_PTHREAD_COND_TIMEDWAIT_MONOTONIC_NP 0 |
| // On Android, pthread_condattr_setclock is available from version 21. By |
| // default, we target a new enough version for 64-bit platforms but not for |
| // 32-bit platforms. For older versions, use |
| // pthread_cond_timedwait_monotonic_np. |
| #elif defined(WEBRTC_ANDROID) && (__ANDROID_API__ < 21) |
| #define USE_CLOCK_GETTIME 1 |
| #define USE_PTHREAD_COND_TIMEDWAIT_MONOTONIC_NP 1 |
| #else |
| #define USE_CLOCK_GETTIME 1 |
| #define USE_PTHREAD_COND_TIMEDWAIT_MONOTONIC_NP 0 |
| #endif |
| |
| Event::Event(bool manual_reset, bool initially_signaled) |
| : is_manual_reset_(manual_reset), event_status_(initially_signaled) { |
| RTC_CHECK(pthread_mutex_init(&event_mutex_, nullptr) == 0); |
| pthread_condattr_t cond_attr; |
| RTC_CHECK(pthread_condattr_init(&cond_attr) == 0); |
| #if USE_CLOCK_GETTIME && !USE_PTHREAD_COND_TIMEDWAIT_MONOTONIC_NP |
| RTC_CHECK(pthread_condattr_setclock(&cond_attr, CLOCK_MONOTONIC) == 0); |
| #endif |
| RTC_CHECK(pthread_cond_init(&event_cond_, &cond_attr) == 0); |
| pthread_condattr_destroy(&cond_attr); |
| } |
| |
| 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) { |
| #if USE_CLOCK_GETTIME |
| clock_gettime(CLOCK_MONOTONIC, &ts); |
| #else |
| struct timeval tv; |
| gettimeofday(&tv, nullptr); |
| ts.tv_sec = tv.tv_sec; |
| ts.tv_nsec = tv.tv_usec * 1000; |
| #endif |
| |
| ts.tv_sec += (milliseconds / 1000); |
| ts.tv_nsec += (milliseconds % 1000) * 1000000; |
| |
| // Handle overflow. |
| if (ts.tv_nsec >= 1000000000) { |
| ts.tv_sec++; |
| ts.tv_nsec -= 1000000000; |
| } |
| } |
| |
| pthread_mutex_lock(&event_mutex_); |
| if (milliseconds != kForever) { |
| while (!event_status_ && error == 0) { |
| #if USE_PTHREAD_COND_TIMEDWAIT_MONOTONIC_NP |
| error = |
| pthread_cond_timedwait_monotonic_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 |