Troubleshooting Deadlocks in multiple threads

-(void) Touchesbegan: (nsset<uitouch *> *) touches withevent: (uievent *) event

{

//Home row Async

[Self mainqueueasync];

//Home row synchronization

[Self mainqueuesync];

// resolution of deadlocks

[Self demo];

}

// resolution of deadlocks

-(void) demo

{

NSLog(@ "Begin");

// asynchronous

dispatch_async(dispatch_get_global_queue(0, 0), ^{

//Home column The home column performs the task only when the main thread is idle

dispatch_queue_t mainqueue = dispatch_get_main_queue();

//2. Task

dispatch_block_t Task1 = ^ {

[nsthread sleepfortimeinterval: 1.0];

NSLog(@ "Task1%@", [nsthread currentthread]);

};

dispatch_block_t Task2 = ^ {

NSLog(@ "Task2%@", [nsthread currentthread]);

};

// sync

Dispatch_sync(Mainqueue, Task1);

Dispatch_sync(Mainqueue, task2);

});

NSLog(@ "End");

}

Home row Sync deadlock

-(void) Mainqueuesync

{

NSLog(@ "Begin");

//Home column The home column performs the task only when the main thread is idle

dispatch_queue_t mainqueue = dispatch_get_main_queue();

//2. Task

dispatch_block_t Task1 = ^ {

[nsthread sleepfortimeinterval: 1.0];

NSLog(@ "Task1%@", [nsthread currentthread]);

};

dispatch_block_t Task2 = ^ {

NSLog(@ "Task2%@", [nsthread currentthread]);

};

// sync

Dispatch_sync(Mainqueue, Task1);

Dispatch_sync(Mainqueue, task2);

NSLog(@ "End");

}

The task for the Home row asynchronous home column is performed only in the main thread, in turn

-(void) Mainqueueasync

{

//Home row

dispatch_queue_t mainqueue = dispatch_get_main_queue();

//2. Task

dispatch_block_t Task1 = ^ {

[nsthread sleepfortimeinterval: 1.0];

NSLog(@ "Task1%@", [nsthread currentthread]);

};

dispatch_block_t Task2 = ^ {

NSLog(@ "Task2%@", [nsthread currentthread]);

};

// asynchronous

Dispatch_async(Mainqueue, Task1);

Dispatch_async(Mainqueue, task2);

}

Troubleshooting Deadlocks in multiple threads