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/*
* Copyright (c) 2020 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 "test/time_controller/simulated_thread.h"
#include <algorithm>
#include <memory>
#include <utility>
#include "absl/functional/any_invocable.h"
#include "absl/strings/string_view.h"
#include "api/function_view.h"
#include "api/location.h"
#include "api/task_queue/task_queue_base.h"
#include "api/units/time_delta.h"
#include "api/units/timestamp.h"
#include "rtc_base/checks.h"
#include "rtc_base/socket.h"
#include "rtc_base/socket_server.h"
#include "rtc_base/synchronization/mutex.h"
#include "rtc_base/thread.h"
#include "rtc_base/time_utils.h"
#include "test/time_controller/simulated_time_controller.h"
namespace webrtc {
namespace {
// A socket server that does nothing. It's different from NullSocketServer in
// that it does allow sleep/wakeup. This avoids usage of an Event instance which
// otherwise would cause issues with the simulated Yeild behavior.
class DummySocketServer : public SocketServer {
public:
Socket* CreateSocket(int family, int type) override {
RTC_DCHECK_NOTREACHED();
return nullptr;
}
bool Wait(TimeDelta max_wait_duration, bool process_io) override {
RTC_CHECK(max_wait_duration.IsZero());
return true;
}
void WakeUp() override {}
};
} // namespace
SimulatedThread::SimulatedThread(
sim_time_impl::SimulatedTimeControllerImpl* handler,
absl::string_view name,
std::unique_ptr<SocketServer> socket_server)
: Thread(socket_server ? std::move(socket_server)
: std::make_unique<DummySocketServer>()),
handler_(handler),
name_(new char[name.size()]) {
std::copy_n(name.begin(), name.size(), name_);
}
SimulatedThread::~SimulatedThread() {
handler_->Unregister(this);
delete[] name_;
}
void SimulatedThread::RunReady(Timestamp at_time) {
CurrentThreadSetter set_current(this);
ProcessMessages(0);
int delay_ms = GetDelay();
MutexLock lock(&lock_);
if (delay_ms == kForever) {
next_run_time_ = Timestamp::PlusInfinity();
} else {
next_run_time_ = at_time + TimeDelta::Millis(delay_ms);
}
}
void SimulatedThread::BlockingCallImpl(FunctionView<void()> functor,
const Location& /*location*/) {
if (IsQuitting())
return;
if (IsCurrent()) {
functor();
} else {
TaskQueueBase* yielding_from = TaskQueueBase::Current();
handler_->StartYield(yielding_from);
RunReady(Timestamp::MinusInfinity());
CurrentThreadSetter set_current(this);
functor();
handler_->StopYield(yielding_from);
}
}
void SimulatedThread::PostTaskImpl(absl::AnyInvocable<void() &&> task,
const PostTaskTraits& traits,
const Location& location) {
Thread::PostTaskImpl(std::move(task), traits, location);
MutexLock lock(&lock_);
next_run_time_ = Timestamp::MinusInfinity();
}
void SimulatedThread::PostDelayedTaskImpl(absl::AnyInvocable<void() &&> task,
TimeDelta delay,
const PostDelayedTaskTraits& traits,
const Location& location) {
Thread::PostDelayedTaskImpl(std::move(task), delay, traits, location);
MutexLock lock(&lock_);
next_run_time_ =
std::min(next_run_time_, Timestamp::Millis(TimeMillis()) + delay);
}
void SimulatedThread::Stop() {
Thread::Quit();
}
SimulatedMainThread::SimulatedMainThread(
sim_time_impl::SimulatedTimeControllerImpl* handler)
: SimulatedThread(handler, "main", nullptr), current_setter_(this) {}
SimulatedMainThread::~SimulatedMainThread() {
// Removes pending tasks in case they keep shared pointer references to
// objects whose destructor expects to run before the Thread destructor.
Stop();
DoDestroy();
}
} // namespace webrtc
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