103 lines
3.0 KiB
Objective-C
103 lines
3.0 KiB
Objective-C
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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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 "RCTUIManagerUtils.h"
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#import <libkern/OSAtomic.h>
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#import "RCTAssert.h"
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char *const RCTUIManagerQueueName = "com.facebook.react.ShadowQueue";
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static BOOL pseudoUIManagerQueueFlag = NO;
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dispatch_queue_t RCTGetUIManagerQueue(void)
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{
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static dispatch_queue_t shadowQueue;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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if ([NSOperation instancesRespondToSelector:@selector(qualityOfService)]) {
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dispatch_queue_attr_t attr = dispatch_queue_attr_make_with_qos_class(DISPATCH_QUEUE_SERIAL, QOS_CLASS_USER_INTERACTIVE, 0);
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shadowQueue = dispatch_queue_create(RCTUIManagerQueueName, attr);
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} else {
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shadowQueue = dispatch_queue_create(RCTUIManagerQueueName, DISPATCH_QUEUE_SERIAL);
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dispatch_set_target_queue(shadowQueue, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0));
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}
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});
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return shadowQueue;
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}
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BOOL RCTIsUIManagerQueue()
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{
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static void *queueKey = &queueKey;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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dispatch_queue_set_specific(RCTGetUIManagerQueue(), queueKey, queueKey, NULL);
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});
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return dispatch_get_specific(queueKey) == queueKey;
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}
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BOOL RCTIsPseudoUIManagerQueue()
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{
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if (RCTIsMainQueue()) {
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return pseudoUIManagerQueueFlag;
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}
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return NO;
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}
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void RCTExecuteOnUIManagerQueue(dispatch_block_t block)
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{
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if (RCTIsUIManagerQueue() || RCTIsPseudoUIManagerQueue()) {
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block();
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} else {
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dispatch_async(RCTGetUIManagerQueue(), ^{
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block();
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});
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}
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}
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void RCTUnsafeExecuteOnUIManagerQueueSync(dispatch_block_t block)
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{
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if (RCTIsUIManagerQueue() || RCTIsPseudoUIManagerQueue()) {
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block();
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} else {
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if (RCTIsMainQueue()) {
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dispatch_semaphore_t mainQueueBlockingSemaphore = dispatch_semaphore_create(0);
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dispatch_semaphore_t uiManagerQueueBlockingSemaphore = dispatch_semaphore_create(0);
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// Dispatching block which blocks UI Manager queue.
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dispatch_async(RCTGetUIManagerQueue(), ^{
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// Initiating `block` execution on main queue.
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dispatch_semaphore_signal(mainQueueBlockingSemaphore);
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// Waiting for finishing `block`.
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dispatch_semaphore_wait(uiManagerQueueBlockingSemaphore, DISPATCH_TIME_FOREVER);
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});
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// Waiting for block on UIManager queue.
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dispatch_semaphore_wait(mainQueueBlockingSemaphore, DISPATCH_TIME_FOREVER);
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pseudoUIManagerQueueFlag = YES;
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// `block` execution while UIManager queue is blocked by semaphore.
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block();
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pseudoUIManagerQueueFlag = NO;
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// Signalling UIManager block.
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dispatch_semaphore_signal(uiManagerQueueBlockingSemaphore);
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} else {
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dispatch_sync(RCTGetUIManagerQueue(), ^{
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block();
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});
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}
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}
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}
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NSNumber *RCTAllocateRootViewTag()
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{
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// Numbering of these tags goes from 1, 11, 21, 31, ..., 100501, ...
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static int64_t rootViewTagCounter = -1;
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return @(OSAtomicIncrement64(&rootViewTagCounter) * 10 + 1);
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}
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