同步执行 + 串行队列
2020-07-06 本文已影响0人
Jean_Lina
/**
* 同步执行 + 串行队列
* 特点：不会开启新线程，在当前线程执行任务。任务是串行的，执行完一个任务，再执行下一个任务。
*/
- (void)syncSerial {
//打印当前线程
NSLog(@"currentThread---%@",[NSThread currentThread]);
NSLog(@"syncSerial---begin");
dispatch_queue_t queue = dispatch_queue_create("net.bujige.testQueue", DISPATCH_QUEUE_SERIAL);
dispatch_sync(queue, ^{
// 追加任务1
for (int i = 0; i < 2; ++i) {
//模拟耗时操作
[NSThread sleepForTimeInterval:2];
//打印当前线程
NSLog(@"1---%@",[NSThread currentThread]);
}
});
dispatch_sync(queue, ^{
// 追加任务2
for (int i = 0; i < 2; ++i) {
//模拟耗时操作
[NSThread sleepForTimeInterval:2];
//打印当前线程
NSLog(@"2---%@",[NSThread currentThread]);
}
});
dispatch_sync(queue, ^{
// 追加任务3
for (int i = 0; i < 2; ++i) {
//模拟耗时操作
[NSThread sleepForTimeInterval:2];
//打印当前线程
NSLog(@"3---%@",[NSThread currentThread]);
}
});
NSLog(@"syncSerial---end");
}
运行结果：
2020-07-06 20:49:09.521419+0800 GCD[16131:3095672] currentThread---<NSThread: 0x60000185a140>{number = 1, name = main}
2020-07-06 20:49:09.521539+0800 GCD[16131:3095672] syncSerial---begin
2020-07-06 20:49:11.522312+0800 GCD[16131:3095672] 1---<NSThread: 0x60000185a140>{number = 1, name = main}
2020-07-06 20:49:13.523524+0800 GCD[16131:3095672] 1---<NSThread: 0x60000185a140>{number = 1, name = main}
2020-07-06 20:49:15.524799+0800 GCD[16131:3095672] 2---<NSThread: 0x60000185a140>{number = 1, name = main}
2020-07-06 20:49:17.525834+0800 GCD[16131:3095672] 2---<NSThread: 0x60000185a140>{number = 1, name = main}
2020-07-06 20:49:19.526351+0800 GCD[16131:3095672] 3---<NSThread: 0x60000185a140>{number = 1, name = main}
2020-07-06 20:49:21.527517+0800 GCD[16131:3095672] 3---<NSThread: 0x60000185a140>{number = 1, name = main}
2020-07-06 20:49:21.527653+0800 GCD[16131:3095672] syncSerial---end
