57 lines
1.8 KiB
Objective-C
57 lines
1.8 KiB
Objective-C
/*
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* Copyright 2017 Google
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#import "FirebaseAuth/Sources/Auth/FIRAuthSerialTaskQueue.h"
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#import "FirebaseAuth/Sources/Auth/FIRAuthGlobalWorkQueue.h"
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NS_ASSUME_NONNULL_BEGIN
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@implementation FIRAuthSerialTaskQueue {
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/** @var _dispatchQueue
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@brief The asyncronous dispatch queue into which tasks are enqueued and processed
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serially.
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*/
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dispatch_queue_t _dispatchQueue;
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}
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- (instancetype)init {
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self = [super init];
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if (self) {
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_dispatchQueue = dispatch_queue_create("com.google.firebase.auth.serialTaskQueue", NULL);
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dispatch_set_target_queue(_dispatchQueue, FIRAuthGlobalWorkQueue());
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}
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return self;
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}
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- (void)enqueueTask:(FIRAuthSerialTask)task {
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// This dispatch queue will run tasks serially in FIFO order, as long as it's not suspended.
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dispatch_async(self->_dispatchQueue, ^{
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// But as soon as a task is started, stop other tasks from running until the task calls it's
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// completion handler, which allows the queue to resume processing of tasks. This allows the
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// task to perform other asyncronous actions on other dispatch queues and "get back to us" when
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// all of their sub-tasks are complete.
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dispatch_suspend(self->_dispatchQueue);
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task(^{
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dispatch_resume(self->_dispatchQueue);
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});
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});
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}
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@end
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NS_ASSUME_NONNULL_END
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