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* Copyright 2019 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 <list>
#include <memory>
#include <unordered_set>
#include <utility>
#include <vector>
#include "absl/strings/string_view.h"
#include "api/sequence_checker.h"
#include "api/test/time_controller.h"
#include "api/units/timestamp.h"
#include "modules/include/module.h"
#include "modules/utility/include/process_thread.h"
#include "rtc_base/fake_clock.h"
#include "rtc_base/platform_thread_types.h"
#include "rtc_base/synchronization/mutex.h"
#include "rtc_base/synchronization/yield_policy.h"
namespace webrtc {
namespace sim_time_impl {
class SimulatedSequenceRunner {
virtual ~SimulatedSequenceRunner() = default;
// Provides next run time.
virtual Timestamp GetNextRunTime() const = 0;
// Runs all ready tasks and modules and updates next run time.
virtual void RunReady(Timestamp at_time) = 0;
// All implementations also implements TaskQueueBase in some form, but if we'd
// inherit from it in this interface we'd run into issues with double
// inheritance. Therefore we simply allow the implementations to provide a
// casted pointer to themself.
virtual TaskQueueBase* GetAsTaskQueue() = 0;
class SimulatedTimeControllerImpl : public TaskQueueFactory,
public rtc::YieldInterface {
explicit SimulatedTimeControllerImpl(Timestamp start_time);
~SimulatedTimeControllerImpl() override;
std::unique_ptr<TaskQueueBase, TaskQueueDeleter> CreateTaskQueue(
absl::string_view name,
Priority priority) const RTC_LOCKS_EXCLUDED(time_lock_) override;
// Implements the YieldInterface by running ready tasks on all task queues,
// except that if this method is called from a task, the task queue running
// that task is skipped.
void YieldExecution() RTC_LOCKS_EXCLUDED(time_lock_, lock_) override;
// Create process thread with the name |thread_name|.
std::unique_ptr<ProcessThread> CreateProcessThread(const char* thread_name)
RTC_LOCKS_EXCLUDED(time_lock_, lock_);
// Create thread using provided |socket_server|.
std::unique_ptr<rtc::Thread> CreateThread(
const std::string& name,
std::unique_ptr<rtc::SocketServer> socket_server)
RTC_LOCKS_EXCLUDED(time_lock_, lock_);
// Runs all runners in |runners_| that has tasks or modules ready for
// execution.
void RunReadyRunners() RTC_LOCKS_EXCLUDED(time_lock_, lock_);
// Return |current_time_|.
Timestamp CurrentTime() const RTC_LOCKS_EXCLUDED(time_lock_);
// Return min of runner->GetNextRunTime() for runner in |runners_|.
Timestamp NextRunTime() const RTC_LOCKS_EXCLUDED(lock_);
// Set |current_time_| to |target_time|.
void AdvanceTime(Timestamp target_time) RTC_LOCKS_EXCLUDED(time_lock_);
// Adds |runner| to |runners_|.
void Register(SimulatedSequenceRunner* runner) RTC_LOCKS_EXCLUDED(lock_);
// Removes |runner| from |runners_|.
void Unregister(SimulatedSequenceRunner* runner) RTC_LOCKS_EXCLUDED(lock_);
// Indicates that |yielding_from| is not ready to run.
void StartYield(TaskQueueBase* yielding_from);
// Indicates that processing can be continued on |yielding_from|.
void StopYield(TaskQueueBase* yielding_from);
const rtc::PlatformThreadId thread_id_;
const std::unique_ptr<rtc::Thread> dummy_thread_ = rtc::Thread::Create();
mutable Mutex time_lock_;
Timestamp current_time_ RTC_GUARDED_BY(time_lock_);
mutable Mutex lock_;
std::vector<SimulatedSequenceRunner*> runners_ RTC_GUARDED_BY(lock_);
// Used in RunReadyRunners() to keep track of ready runners that are to be
// processed in a round robin fashion. the reason it's a member is so that
// runners can removed from here by Unregister().
std::list<SimulatedSequenceRunner*> ready_runners_ RTC_GUARDED_BY(lock_);
// Runners on which YieldExecution has been called.
std::unordered_set<TaskQueueBase*> yielded_;
} // namespace sim_time_impl
// Used to satisfy sequence checkers for non task queue sequences.
class TokenTaskQueue : public TaskQueueBase {
// Promoted to public
using CurrentTaskQueueSetter = TaskQueueBase::CurrentTaskQueueSetter;
void Delete() override { RTC_NOTREACHED(); }
void PostTask(std::unique_ptr<QueuedTask> /*task*/) override {
void PostDelayedTask(std::unique_ptr<QueuedTask> /*task*/,
uint32_t /*milliseconds*/) override {
// TimeController implementation using completely simulated time. Task queues
// and process threads created by this controller will run delayed activities
// when AdvanceTime() is called. Overrides the global clock backing
// rtc::TimeMillis() and rtc::TimeMicros(). Note that this is not thread safe
// since it modifies global state.
class GlobalSimulatedTimeController : public TimeController {
explicit GlobalSimulatedTimeController(Timestamp start_time);
~GlobalSimulatedTimeController() override;
Clock* GetClock() override;
TaskQueueFactory* GetTaskQueueFactory() override;
std::unique_ptr<ProcessThread> CreateProcessThread(
const char* thread_name) override;
std::unique_ptr<rtc::Thread> CreateThread(
const std::string& name,
std::unique_ptr<rtc::SocketServer> socket_server) override;
rtc::Thread* GetMainThread() override;
void AdvanceTime(TimeDelta duration) override;
rtc::ScopedBaseFakeClock global_clock_;
// Provides simulated CurrentNtpInMilliseconds()
SimulatedClock sim_clock_;
sim_time_impl::SimulatedTimeControllerImpl impl_;
rtc::ScopedYieldPolicy yield_policy_;
std::unique_ptr<rtc::Thread> main_thread_;
} // namespace webrtc