EarlGrey/Synchronization/GREYSyncAPI.m
//
// Copyright 2016 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#import "Synchronization/GREYSyncAPI.h"
#import "Assertion/GREYAssertionDefines.h"
void grey_execute_sync(void (^block)(void)) {
if ([NSThread isMainThread]) {
NSLog(@"grey_execute_sync() cannot be invoked on the main thread. Aborting.");
abort();
}
dispatch_semaphore_t waitForBlock = dispatch_semaphore_create(0);
CFRunLoopPerformBlock(CFRunLoopGetMain(), kCFRunLoopDefaultMode, ^{
block();
dispatch_semaphore_signal(waitForBlock);
});
// CFRunLoopPerformBlock does not wake up the main queue.
CFRunLoopWakeUp(CFRunLoopGetMain());
// Waits until block is executed and semaphore is signalled.
dispatch_semaphore_wait(waitForBlock, DISPATCH_TIME_FOREVER);
}
void grey_execute_async(void (^block)(void)) {
CFRunLoopPerformBlock(CFRunLoopGetMain(), kCFRunLoopDefaultMode, block);
// CFRunLoopPerformBlock does not wake up the main queue.
CFRunLoopWakeUp(CFRunLoopGetMain());
}