98 lines
2.8 KiB
Plaintext
98 lines
2.8 KiB
Plaintext
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/*
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* Copyright (c) Meta Platforms, Inc. and 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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#import "PlatformRunLoopObserver.h"
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#import <mutex>
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namespace facebook {
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namespace react {
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static CFRunLoopActivity toCFRunLoopActivity(RunLoopObserver::Activity activity)
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{
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auto result = CFRunLoopActivity{};
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if (RunLoopObserver::Activity(activity & RunLoopObserver::Activity::BeforeWaiting) ==
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RunLoopObserver::Activity::BeforeWaiting) {
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result = result | kCFRunLoopBeforeWaiting;
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}
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if (RunLoopObserver::Activity(activity & RunLoopObserver::Activity::AfterWaiting) ==
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RunLoopObserver::Activity::AfterWaiting) {
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result = result | kCFRunLoopAfterWaiting;
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}
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return result;
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}
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static RunLoopObserver::Activity toRunLoopActivity(CFRunLoopActivity activity)
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{
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auto result = RunLoopObserver::Activity{};
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if (CFRunLoopActivity(activity & kCFRunLoopBeforeWaiting) == kCFRunLoopBeforeWaiting) {
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result = RunLoopObserver::Activity(result | RunLoopObserver::Activity::BeforeWaiting);
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}
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if (CFRunLoopActivity(activity & kCFRunLoopAfterWaiting) == kCFRunLoopAfterWaiting) {
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result = RunLoopObserver::Activity(result | RunLoopObserver::Activity::AfterWaiting);
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}
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return result;
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}
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PlatformRunLoopObserver::PlatformRunLoopObserver(
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RunLoopObserver::Activity activities,
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RunLoopObserver::WeakOwner const &owner,
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CFRunLoopRef runLoop)
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: RunLoopObserver(activities, owner), runLoop_(runLoop)
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{
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// A value (not a reference) to be captured by the block.
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auto weakOwner = owner;
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// The documentation for `CFRunLoop` family API states that all of the methods are thread-safe.
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// See "Thread Safety and Run Loop Objects" section of the "Threading Programming Guide" for more details.
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mainRunLoopObserver_ = CFRunLoopObserverCreateWithHandler(
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NULL /* allocator */,
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toCFRunLoopActivity(activities_) /* 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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auto strongOwner = weakOwner.lock();
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if (!strongOwner) {
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return;
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}
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this->activityDidChange(toRunLoopActivity(activity));
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});
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assert(mainRunLoopObserver_);
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}
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PlatformRunLoopObserver::~PlatformRunLoopObserver()
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{
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stopObserving();
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CFRelease(mainRunLoopObserver_);
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}
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void PlatformRunLoopObserver::startObserving() const noexcept
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{
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CFRunLoopAddObserver(runLoop_, mainRunLoopObserver_, kCFRunLoopCommonModes);
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}
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void PlatformRunLoopObserver::stopObserving() const noexcept
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{
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CFRunLoopRemoveObserver(runLoop_, mainRunLoopObserver_, kCFRunLoopCommonModes);
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}
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bool PlatformRunLoopObserver::isOnRunLoopThread() const noexcept
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{
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return CFRunLoopGetCurrent() == runLoop_;
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}
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} // namespace react
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} // namespace facebook
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