iOS development multithreading-Status of Threads

iOS development multithreading-Status of Threads

First, Brief introduction

Creation of Threads:

Self.thread=[[nsthread alloc]initwithtarget:self selector: @selector (test) Object:nil];

Description: There are several ways to create threads, and there are not too many introductions here.

Thread-Open:

[Self.thread start];

Running and blocking of threads:

(1) Set thread Block 1, block 2 seconds

[Nsthread sleepfortimeinterval:2.0];

(2) The second set of thread Block 2, the current time as a benchmark to block 4 seconds

NSDate *date=[nsdate datewithtimeintervalsincenow:4.0];

[Nsthread Sleepuntildate:date];

Performance in memory when a thread handles a blocking state: (Threads are moved out of the scheduler thread pool, not scheduled at this time)

Thread of death:

When a thread's task ends, an exception occurs, or a forced exit of these three cases causes the thread to die.

After the thread dies, the thread object is removed from memory.

Second, code example

code Example 1:

 1//2//YYVIEWCONTROLLER.M 3//04-nsthread02-Thread Status 4//5//Created by Apple on 14-6-23. 6//Copyright (c) 2014 itcase. All rights reserved. 7//8 9 #import "YYViewController.h" @interface Yyviewcontroller () @property (nonatomic,strong) Nsthread *thread;1 3 @end15 @implementation YYViewController17-(void) VIEWDIDLOAD19 {[Super viewdidload];21 22//Create line Cheng Self.thread=[[nsthread alloc]initwithtarget:self selector: @selector (test) object:nil];24//Set the name of the thread [self     . Thread setname:@ "Thread A"];26}27//When the finger is pressed, turn on thread-(void) Touchesbegan: (Nsset *) touches withevent: (uievent *) event29 {30 Open thread [Self.thread start];32}33-(void) Test35 {36//Get thread PNs nsthread *current=[nsthread CurrentThread] ; NSLog (@ "Test---print thread---%@", self.thread.name), NSLog (@ "Test---thread starts---%@", current.name); 40 41//Set thread blocking 1 , blocking 2 seconds NSLog (@ "Next, thread blocked for 2 seconds"); [Nsthread sleepfortimeinterval:2.0];44 45///second setting thread blocking 2, blocking 4 seconds at current time as benchmark 46     NSLog (@ "Next, thread blocked for 4 seconds"), NSDate *date=[nsdate datewithtimeintervalsincenow:4.0];48 [Nsthread Sleepuntildate:da te];49 for (int i=0; i<20; i++) {NSLog (@ "Thread--%d--%@", i,current.name);}53 NSLog (@ "Test---thread end---%@", current.name);}55 @end

Print View:

code example 2 (Exit thread):

 1//2//YYVIEWCONTROLLER.M 3//04-nsthread02-Thread Status 4//5//Created by Apple on 14-6-23. 6//Copyright (c) 2014 itcase. All rights reserved. 7//8 9 #import "YYViewController.h" @interface Yyviewcontroller () @property (nonatomic,strong) Nsthread *thread;1 3 @end15 @implementation YYViewController17-(void) VIEWDIDLOAD19 {[Super viewdidload];21 22//Create line Cheng Self.thread=[[nsthread alloc]initwithtarget:self selector: @selector (test) object:nil];24//Set the name of the thread [self     . Thread setname:@ "Thread A"];26}27//When the finger is pressed, turn on thread-(void) Touchesbegan: (Nsset *) touches withevent: (uievent *) event29 {30 Open thread [Self.thread start];32}33-(void) Test35 {36//Get thread PNs nsthread *current=[nsthread CurrentThread] ; NSLog (@ "Test---print thread---%@", self.thread.name), NSLog (@ "Test---thread starts---%@", current.name); 40 41//Set thread blocking 1 , blocking 2 seconds NSLog (@ "Next, thread blocked for 2 seconds"); [Nsthread sleepfortimeinterval:2.0];44 45///second setting thread blocking 2, blocking 4 seconds at current time as benchmark 46     NSLog (@ "Next, thread blocked for 4 seconds"), NSDate *date=[nsdate datewithtimeintervalsincenow:4.0];48 [Nsthread Sleepuntildate:da             te];49 for (int i=0; i<20; i++) {NSLog (@ "Thread--%d--%@", i,current.name); if (5==i) {52  End thread [nsthread exit];54}55}57 NSLog (@ "Test---thread end---%@", current.name); 58}59 60 @end

Print Example:

Note: The death of a person can not be resurrected, the thread dead can not be resurrected (re-open), if the thread after death, click on the screen again to try to re-open the threads, the program will hang.

iOS development multithreading-Status of Threads