IOS multithreading is first seen, and ios Multithreading

IOS multithreading is first seen, and ios Multithreading

1. Three ways to create a thread

// First

NSThread * thread1 = [[NSThread alloc] initWithTarget: self selector: @ selector (doAction) object: nil];

// Thread name

Thread1.name = @ "thread1 ";

// Thread priority, 0 ~ 1

Thread1 threadpriority = 1.0;

// Enable the thread

[Thread1 start];

// Type 2

// Create a thread by using the class method and enable start without displaying

[NSThread detachNewThreadSelector: @ selector (doAction) toTarget: self withObject: nil];

// The third type

// Create multiple threads implicitly

[Self defined mselectorinbackground: @ selector (doAction :) withObject: nil];

 

@ Implementation ViewController

-(Void) viewDidLoad {

[Super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

 

NSLog (@ "mainThread-% @", [NSThread mainThread]);

 

NSThread * thread = [[NSThread alloc] initWithTarget: self selector: @ selector (handleAction) object: nil];

// Ready

[Thread start];

}

 

-(Void) handleAction {

For (NSInteger I = 0; I <100; I ++ ){

// Blocking status

// [NSThread sleepForTimeInterval: 2];

// [NSThread sleepUntilDate: [NSDate dateWithTimeIntervalSinceNow: 2];

// NSLog (@ "% @, % @", [NSThread currentThread], @ (I ));

// You can obtain the master thread from the subthread.

NSLog (@ "mainThread-% @", [NSThread mainThread]);

If (I = 10 ){

// Exit

[NSThread exit];

}

}

}

3. Synchronize code blocks to implement the ticket buying Function

@ Implementation ViewController

 

-(Void) viewDidLoad {

[Super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

Self. tickets = 20;

NSThread * thread1 = [[NSThread alloc] initWithTarget: self selector: @ selector (saleTicket) object: nil];

// Thread1.name = @ "computer ";

[Thread1 start];

 

NSThread * thread2 = [[NSThread alloc] initWithTarget: self selector: @ selector (saleTicket) object: nil];

// Thread2.name = @ "phone ";

[Thread2 start];

}

 

-(Void) saleTicket {

While (1 ){

// [NSThread sleepForTimeInterval: 1];

// The token must be accessible to all threads. self is generally used.

// @ Synchronized (){

// Code segment

//}

// NSObject * o = [[NSObject alloc] init];

// Mutex lock

@ Synchronized (self ){

[NSThread sleepForTimeInterval: 2];

If (self. tickets> 0 ){

NSLog (@ "% @ remaining votes % @ Zhang", [NSThread currentThread], @ (self. tickets ));

Self. tickets --;

} Else {

NSLog (@ "tickets sold out ");

Break;

}

}

}

}