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/*
* 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(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)
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);
RTC_CHECK(pthread_cond_init(&event_cond_, nullptr) == 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).
#ifdef 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, nullptr);
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) {
#ifdef 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
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