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/*
* Copyright (C) 2012-2023 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <wtf/HashSet.h>
#include <wtf/Lock.h>
#include <wtf/RefPtr.h>
#include <wtf/RetainPtr.h>
#include <wtf/RunLoop.h>
#include <wtf/SharedTask.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/ThreadSafeRefCounted.h>
namespace JSC {
class JSLock;
class VM;
class JSRunLoopTimer : public ThreadSafeRefCounted<JSRunLoopTimer> {
public:
typedef void TimerNotificationType();
using TimerNotificationCallback = RefPtr<WTF::SharedTask<TimerNotificationType>>;
class Manager {
WTF_MAKE_NONCOPYABLE(Manager);
WTF_MAKE_TZONE_ALLOCATED(Manager);
void timerDidFireCallback();
Manager() = default;
void timerDidFire();
public:
static Manager& singleton();
void registerVM(VM&);
void unregisterVM(VM&);
void scheduleTimer(JSRunLoopTimer&, Seconds nextFireTime);
void cancelTimer(JSRunLoopTimer&);
std::optional<Seconds> timeUntilFire(JSRunLoopTimer&);
// Do nothing since this is a singleton.
void ref() const { }
void deref() const { }
private:
Lock m_lock;
class PerVMData {
WTF_MAKE_FAST_ALLOCATED;
WTF_MAKE_NONCOPYABLE(PerVMData);
public:
PerVMData(Manager&, WTF::RunLoop&);
~PerVMData();
Ref<WTF::RunLoop> runLoop;
std::unique_ptr<RunLoop::Timer> timer;
Vector<std::pair<Ref<JSRunLoopTimer>, MonotonicTime>> timers;
};
UncheckedKeyHashMap<Ref<JSLock>, std::unique_ptr<PerVMData>> m_mapping;
};
JSRunLoopTimer(VM&);
JS_EXPORT_PRIVATE virtual ~JSRunLoopTimer();
virtual void doWork(VM&) = 0;
JS_EXPORT_PRIVATE void setTimeUntilFire(Seconds intervalInSeconds);
void cancelTimer();
bool isScheduled() const { return m_isScheduled; }
// Note: The only thing the timer notification callback cannot do is
// call setTimeUntilFire(). This will cause a deadlock. It would not
// be hard to make this work, however, there are no clients that need
// this behavior. We should implement it only if we find that we need it.
JS_EXPORT_PRIVATE void addTimerSetNotification(TimerNotificationCallback);
JS_EXPORT_PRIVATE void removeTimerSetNotification(TimerNotificationCallback);
JS_EXPORT_PRIVATE std::optional<Seconds> timeUntilFire();
protected:
static constexpr Seconds s_decade { 60 * 60 * 24 * 365 * 10 };
Ref<JSLock> m_apiLock;
private:
friend class Manager;
void timerDidFire();
UncheckedKeyHashSet<TimerNotificationCallback> m_timerSetCallbacks;
Lock m_timerCallbacksLock;
Lock m_lock;
bool m_isScheduled { false };
};
} // namespace JSC
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