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5f4aa6ae42
Summary: That's why we need the previous three diffs. Synchonous executor deadlocks if the beat is missing. Reviewed By: sahrens Differential Revision: D10081501 fbshipit-source-id: 9986d0a1844e642048b6f37a1fcb5f623a267663
72 lines
2.0 KiB
Plaintext
72 lines
2.0 KiB
Plaintext
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#include "MessageQueueEventBeat.h"
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namespace facebook {
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namespace react {
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MessageQueueEventBeat::MessageQueueEventBeat(const std::shared_ptr<MessageQueueThread> &messageQueueThread):
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messageQueueThread_(messageQueueThread) {
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mainRunLoopObserver_ =
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CFRunLoopObserverCreateWithHandler(
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NULL /* allocator */,
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kCFRunLoopBeforeWaiting /* activities */,
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true /* repeats */,
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0 /* order */,
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^(CFRunLoopObserverRef observer, CFRunLoopActivity activity) {
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// Note: We only `induce` beat here; actual beat will be performed on
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// a different thread.
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this->induce();
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}
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);
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assert(mainRunLoopObserver_);
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CFRunLoopAddObserver(CFRunLoopGetMain(), mainRunLoopObserver_, kCFRunLoopCommonModes);
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}
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MessageQueueEventBeat::~MessageQueueEventBeat() {
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CFRunLoopRemoveObserver(CFRunLoopGetMain(), mainRunLoopObserver_, kCFRunLoopCommonModes);
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CFRelease(mainRunLoopObserver_);
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}
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void MessageQueueEventBeat::induce() const {
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if (!isRequested_ || isBusy_) {
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return;
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}
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#ifndef NDEBUG
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// We do a trick here.
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// If `wasExecuted` was destroyed before set to `true`,
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// it means that the execution block was deallocated not being executed.
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// This indicates that `messageQueueThread_` is being deallocated.
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// This trick is quite expensive due to deallocation and messing with atomic
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// counters. Seems we need this only for making hot-reloading mechanism
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// thread-safe. Hence, let's leave it to be DEBUG-only for now.
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auto wasExecuted = std::shared_ptr<bool>(new bool {false}, [this](bool *wasExecuted) {
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if (!*wasExecuted && failCallback_) {
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failCallback_();
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}
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delete wasExecuted;
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});
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#endif
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isBusy_ = true;
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messageQueueThread_->runOnQueue([=]() mutable {
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this->beat();
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isBusy_ = false;
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#ifndef NDEBUG
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*wasExecuted = true;
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#endif
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});
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}
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} // namespace react
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} // namespace facebook
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