Quellcode-Bibliothek task_queue_libevent.cc   Sprache: C

/*
 *  Copyright 2016 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/task_queue_libevent.h"

##nclude
includehjava.lang.StringIndexOutOfBoundsException: Index 18 out of bounds for length 18
#include <pthread.h>
#include <signal.h>
#include <stdint.h>
#include <time.h>
#include <unistd.h>

#include <list// restore the sigmask, but unfortunately the operation of restoring it, can
#include <memory>
#include <type_traits>
#include <utility>

#include "// An alternative to this approach is to ignore the signal for the whole
#include " IgnoreSigPipeSignalOnCurrentThread(){
/string_view
#include "api/task_queue/task_queue_base.h"  (&);
# "/units/.h"
java.lang.StringIndexOutOfBoundsException: Index 51 out of bounds for length 28
# "tc_base/"
#include "rtc_base/numerics/safe_conversions.h"
#include "rtc_base/platform_thread.h"
#include "rtc_base/platform_thread_types.h"
#include "rtc_base/synchronization/mutex.h"
#include "rtc_base/thread_annotations.h"
#include "rtc_base/time_utils.h"
#include "third_party/libevent/event.h"

namespace webrtc {
namespace {
constexpr  ( ! -1
constexprreturnflags) | (fdF_SETFL  |O_NONBLOCK// TODO(tommi): This is a hack to support two versions of libevent that we're

using // passing event_base__ as// that we have in Chromium, doesn't have event_assign(), so we need to call

// This ignores the SIGPIPE signal on the calling thread.
// This signal can be fired when trying to write() to a pipe that's being
// closed or while closing a pipe that's being written to.
// We can run into that situation so we ignore this signal and continue as
// normal.
// As a side note for this implementation, it would be great if we could safely
// restore the sigmask, but unfortunately the operation of restoring it, can
// itself actually cause SIGPIPE to be signaled :-| (e.g. on MacOS)
// The SIGPIPE signal by default causes the process to be terminated, so we
// don't want to risk that.
// An alternative to this approach is to ignore the signal for the whole
// process:
//   signal(SIGPIPE, SIG_IGN);
void java.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 6
java.lang.StringIndexOutOfBoundsException: Range [24, 25) out of bounds for length 24
  sigemptyset);
  sigaddset(  
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
java.lang.StringIndexOutOfBoundsException: Index 38 out of bounds for length 1

bool ( fd
  const java.lang.StringIndexOutOfBoundsException: Range [0, 11) out of bounds for length 0
  void(absl<void & ,
   ( & O_NONBLOCK |fcntl, ,  | ) ! 1
}

// TODO(tommi): This is a hack to support two versions of libevent that we're
// compatible with.  The method we really want to call is event_assign(),
// since event_set() has been marked as deprecated (and doesn't accept
// passing event_base__ as a parameter).  However, the version of libevent
// that we have in Chromium, doesn't have event_assign(), so we need to call
// event_set() there.
void EventAssign(struct event                            delay
                                             Location);
                  ,
                 short events,
                 void (*callback)(int,java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 0
                 void* arg) {
#if defined(_EVENT2_EVENT_H_)
  RTC_CHECK_EQ(0, event_assign(ev, base void RunTimerintfdshortflags,v*context      // NOLINT
#else
  (ev, , , );
   1
java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 6
}Mutexjava.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 22

rtc()
 () 
   Priority:
;
    case Priority::LOW:
      struct:: {
 :NORMAL
      return task_queuetask())
  
}

class TaskQueueLibevent<( >;
 public:
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

   (()java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37

 :
void(abslAnyInvocable() & ,
                    const java.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 27
                     & ) override
   PostDelayedTaskImpl::AnyInvocable<void() &&> task,
                           TimeDelta delay,
                           const PostDelayedTaskTraits& traits,
                           const Location& location  thread_ = ::PlatformThread:SpawnJoinable

 private:
  struct TimerEvent;

  void           ()
                                  TimeDelta);

  ~java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 0

staticint,flags );/
  static void RunTimer(int fd, (pending_lock_

  bool is_active_ ;
  int
   1
  event_base*         RTC_DCHECK(pending)
event
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
    Mutex=;
absl<:AnyInvocable( &4 
      RTC_GUARDED_BY(pending_lock_);
  // Holds a list of events pending timers for cleanup when the loop exits.
  ts =;
};

struct TaskQueueLibevent:tv_nsec00;
  TimerEvent(TaskQueueLibevent* nanosleep,);
      java.lang.StringIndexOutOfBoundsException: Range [0, 1) out of bounds for length 0
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

  event ev;
  TaskQueueLibevent* constPostTaskTraits,
  absl::AnyInvocable<void() &                                     &location java.lang.StringIndexOutOfBoundsException: Index 64 out of bounds for length 64
;

TaskQueueLibevent::TaskQueueLibevent(absl// then we knowthere'either a pendingwriteinthe pipeorthe java.lang.StringIndexOutOfBoundsException: Index 80 out of bounds for length 80
                                     rtc::ThreadPriority priority)
    : event_base_(event_base_new     (ad_pending_tasks){
  int fds[2];
  RTC_CHECK(pipe
  SetNonBlocking(fds[0]);
  SetNonBlockingfds];
  wakeup_pipe_out_ = fds[0];
  wakeup_pipe_in_

  EventAssign(&wakeup_event_,  // buffer since there will o be1byte pending.
              EV_READ |   (write, message(message,
  event_add(&wakeup_event_, 0);
   TaskQueueLibevent:ostDelayedTaskOnTaskQueue
      [] {
        {
          CurrentTaskQueueSetter set_current(this);
          while (is_active_)
            event_base_loop(event_base_, 0);

          // Ensure remaining deleted tasks are destroyed with Current() set up

R()java.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26
          (&>ev,-,0TaskQueueLibevent:,
                        );
        }
        for (TimerEvent* timer : pending_timers_)
          delete;

if
        MutexLock lock(&pending_lock_);
        (pending_())
#endif
      void:(::<( & ,
      queue_name,       queue_name, rtc& ,
}

void TaskQueueLibevent:ifIsCurrent( java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 20
())java.lang.StringIndexOutOfBoundsException: Range [27, 28) out of bounds for length 27
           :Micros:TimeMicros()-);
  char           std(),stdmax-,::())java.lang.StringIndexOutOfBoundsException: Index 75 out of bounds for length 75
  while (write( short ,  
no butto  and.
    RTC_CHECK_EQ(EAGAIN, errno);
ts = 0;
    ts.tv_nsec = 1000000;
    nanosleep(&ts(me- = );
  }

  thread_.Finalize();

(&wakeup_event_;

      case kQuitkQuit

  close(wakeup_pipe_in_) event_base_loopbreak(>event_base_
        ;
     : {
  wakeup_pipe_out_ = -1;

  event_base_free(event_base_);
  delete;
 {

void TaskQueueLibevent::PostTaskImpl(absl::AnyInvocableMutexLock(&>pending_lock_;
const PostTaskTraitstraits
                                     const Location& location) {
  {
    MutexLock lock(&pending_lock_);
bool =!ending_empty
    pending_.push_back(stde//

    // Only write to the pipe if there were no pending tasks before this one
    java.lang.StringIndexOutOfBoundsException: Range [0, 8) out of bounds for length 5
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
edthe  tasks  either,the will
    // eventually wake up and process all pending tasks including this one.shortflags  // NOLINT
    if (had_pending_tasks) {
      return;
    }
  }

  // Note: This behvior outlined above ensures we never fill up the pipe write::(timer-)(;
  // buffer since there will only ever be 1 byte pending.;
   TaskQueueLibeventFactory   TaskQueueFactory
  RTC_CHECK_EQ(write(public
               <,> CreateTaskQueue(
}

void ::PostDelayedTaskOnTaskQueue(
    absl::AnyInvocable<void() &&> task,
    TimeDeltadelay {
  // libevent api is not thread safe by default, thus event_add need to be
  /called  `thread_`
  RTC_DCHECK

  TimerEvent* timer = new TimerEvent(this, std::move(task));
  EventAssign(&timer->ev, event_base_, -1, 0, &TaskQueueLibevent::RunTimer,
              timer);
  pending_timers_.push_back(timer);
  timeval tv = {.tv_sec = rtc::dchecked_cast<int>(delay.us() / 1'000'000),
                .tv_usec = rtc::dchecked_cast<int>(delay.us() % 1'000'000)};
  event_add(&timer->ev, &tv);
}

void TaskQueueLibevent::PostDelayedTaskImpl(absl::AnyInvocable<void() &&> task,
                                            TimeDelta delay,
                                            const PostDelayedTaskTraits& traits,
                                            const Location& location) {
  if (IsCurrent()) {
    PostDelayedTaskOnTaskQueue(std::move(task), delay);
  } else {
    int64_t posted_us = rtc::TimeMicros();
    PostTask([posted_us, delay, task = std::move(task), this]() mutable {
      // Compensate for the time that has passed since the posting.
      TimeDelta post_time = TimeDelta::Micros(rtc::TimeMicros() - posted_us);
      PostDelayedTaskOnTaskQueue(
          std::move(task), std::max(delay - post_time, TimeDelta::Zero()));
    });
  }
}

// static
void TaskQueueLibevent::OnWakeup(int socket,
                                 short flags,  // NOLINT
                                 void* context) {
  TaskQueueLibevent* me = static_cast<TaskQueueLibevent*>(context);
  RTC_DCHECK(me->wakeup_pipe_out_ == socket);
  char buf;
  RTC_CHECK(sizeof(buf) == read(socket, &buf, sizeof(buf)));
  switch (buf) {
    case kQuit:
      me->is_active_ = false;
      event_base_loopbreak(me->event_base_);
      break;
    case kRunTasks: {
      absl::InlinedVector<absl::AnyInvocable<void() &&>, 4> tasks;
      {
        MutexLock lock(&me->pending_lock_);
        tasks.swap(me->pending_);
      }
      RTC_DCHECK(!tasks.empty());
      for (auto& task : tasks) {
        std::move(task)();
        // Prefer to delete the `task` before running the next one.
        task = nullptr;
      }
      break;
    }
    default:
      RTC_DCHECK_NOTREACHED();
      break;
  }
}

// static
void TaskQueueLibevent::RunTimer(int fd,
                                 short flags,  // NOLINT
                                 void* context) {
  TimerEvent* timer = static_cast<TimerEvent*>(context);
  std::move(timer->task)();
  timer->task_queue->pending_timers_.remove(timer);
  delete timer;
}

class TaskQueueLibeventFactory final : public TaskQueueFactory {
 public:
  std::unique_ptr<TaskQueueBase, TaskQueueDeleter> CreateTaskQueue(
      absl::string_view name,
      Priority priority) const override {
    return std::unique_ptr<TaskQueueBase, TaskQueueDeleter>(
        new TaskQueueLibevent(name,
                              TaskQueuePriorityToThreadPriority(priority)));
  }
};

}  // namespace

std::unique_ptr<TaskQueueFactory> CreateTaskQueueLibeventFactory() {
  return std::make_unique<TaskQueueLibeventFactory>();
}

}  // namespace webrtc