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/*
* Copyright (C) 2017-2018 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.
*/
#include "config.h"
#include "PromiseDeferredTimer.h"
#include "JSPromiseDeferred.h"
#include "StrongInlines.h"
#include "VM.h"
#include <wtf/Locker.h>
#include <wtf/RunLoop.h>
namespace JSC {
namespace PromiseDeferredTimerInternal {
static const bool verbose = false;
}
PromiseDeferredTimer::PromiseDeferredTimer(VM& vm)
: Base(&vm)
{
}
void PromiseDeferredTimer::doWork(VM& vm)
{
ASSERT(vm.currentThreadIsHoldingAPILock());
m_taskLock.lock();
cancelTimer();
if (!m_runTasks) {
m_taskLock.unlock();
return;
}
while (!m_tasks.isEmpty()) {
JSPromiseDeferred* ticket;
Task task;
std::tie(ticket, task) = m_tasks.takeLast();
dataLogLnIf(PromiseDeferredTimerInternal::verbose, "Doing work on promise: ", RawPointer(ticket));
// We may have already canceled these promises.
if (m_pendingPromises.contains(ticket)) {
// Allow tasks we run now to schedule work.
m_currentlyRunningTask = true;
m_taskLock.unlock();
task();
vm.drainMicrotasks();
m_taskLock.lock();
m_currentlyRunningTask = false;
}
}
if (m_pendingPromises.isEmpty() && m_shouldStopRunLoopWhenAllPromisesFinish) {
#if USE(CF)
CFRunLoopStop(vm.runLoop());
#else
RunLoop::current().stop();
#endif
}
m_taskLock.unlock();
}
void PromiseDeferredTimer::runRunLoop()
{
ASSERT(!m_apiLock->vm()->currentThreadIsHoldingAPILock());
#if USE(CF)
ASSERT(CFRunLoopGetCurrent() == m_apiLock->vm()->runLoop());
#endif
m_shouldStopRunLoopWhenAllPromisesFinish = true;
if (m_pendingPromises.size()) {
#if USE(CF)
CFRunLoopRun();
#else
RunLoop::run();
#endif
}
}
void PromiseDeferredTimer::addPendingPromise(VM& vm, JSPromiseDeferred* ticket, Vector<Strong<JSCell>>&& dependencies)
{
ASSERT(vm.currentThreadIsHoldingAPILock());
for (unsigned i = 0; i < dependencies.size(); ++i)
ASSERT(dependencies[i].get() != ticket);
auto result = m_pendingPromises.add(ticket, Vector<Strong<JSCell>>());
if (result.isNewEntry) {
dataLogLnIf(PromiseDeferredTimerInternal::verbose, "Adding new pending promise: ", RawPointer(ticket));
dependencies.append(Strong<JSCell>(vm, ticket));
result.iterator->value = WTFMove(dependencies);
} else {
dataLogLnIf(PromiseDeferredTimerInternal::verbose, "Adding new dependencies for promise: ", RawPointer(ticket));
result.iterator->value.appendVector(dependencies);
}
#ifndef NDEBUG
ticket->promiseAsyncPending();
#endif
}
bool PromiseDeferredTimer::hasPendingPromise(JSPromiseDeferred* ticket)
{
ASSERT(ticket->vm()->currentThreadIsHoldingAPILock());
return m_pendingPromises.contains(ticket);
}
bool PromiseDeferredTimer::hasDependancyInPendingPromise(JSPromiseDeferred* ticket, JSCell* dependency)
{
ASSERT(ticket->vm()->currentThreadIsHoldingAPILock());
ASSERT(m_pendingPromises.contains(ticket));
auto result = m_pendingPromises.get(ticket);
return result.contains(dependency);
}
bool PromiseDeferredTimer::cancelPendingPromise(JSPromiseDeferred* ticket)
{
ASSERT(ticket->vm()->currentThreadIsHoldingAPILock());
bool result = m_pendingPromises.remove(ticket);
if (result)
dataLogLnIf(PromiseDeferredTimerInternal::verbose, "Canceling promise: ", RawPointer(ticket));
return result;
}
void PromiseDeferredTimer::scheduleWorkSoon(JSPromiseDeferred* ticket, Task&& task)
{
LockHolder locker(m_taskLock);
m_tasks.append(std::make_tuple(ticket, WTFMove(task)));
if (!isScheduled() && !m_currentlyRunningTask)
setTimeUntilFire(0_s);
}
} // namespace JSC