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.M3 //04-nsthread02-The state of a thread4 //5 //Created by Apple on 14-6-23.6 //Copyright (c) 2014 itcase. All rights reserved.7 //8 9 #import "YYViewController.h"Ten  One @interfaceYyviewcontroller () A@property (nonatomic,strong) Nsthread *thread; -  - @end the  - @implementationYyviewcontroller -  -- (void) Viewdidload + { - [Super Viewdidload]; +      A     //Creating Threads atSelf.thread=[[nsthread alloc]initwithtarget:self selector: @selector (Test)Object: nil]; -     //set the name of the thread -[Self.thread SetName:@"Thread A"]; - } - //when the finger is pressed, the thread is turned on --(void) Touchesbegan: (Nsset *) touches withevent: (Uievent *)Event in { -     //Open Thread to [Self.thread start]; + } -  the-(void) Test * { $     //Get ThreadPanax NotoginsengNsthread *current=[Nsthread CurrentThread]; -NSLog (@"Test---Print thread---%@", self.thread.name); theNSLog (@"Test---Thread starts---%@", current.name); +      A     //set thread to block 1, block for 2 seconds theNSLog (@"Next, the thread blocks for 2 seconds"); +[Nsthread Sleepfortimeinterval:2.0]; -     $     //The second set of threads blocks 2, blocking 4 seconds on the current time basis $NSLog (@"Next, the thread blocks for 4 seconds"); -NSDate *date=[nsdate Datewithtimeintervalsincenow:4.0]; - [Nsthread sleepuntildate:date]; the      for(intI=0; i< -; i++) { -NSLog (@"Thread--%d--%@", i,current.name);Wuyi          the     } -NSLog (@"Test---thread end---%@", current.name); Wu } -  About @end

Print View:

code example 2 (Exit thread):

1 //2 //YYVIEWCONTROLLER.M3 //04-nsthread02-The state of a thread4 //5 //Created by Apple on 14-6-23.6 //Copyright (c) 2014 itcase. All rights reserved.7 //8 9 #import "YYViewController.h"Ten  One @interfaceYyviewcontroller () A@property (nonatomic,strong) Nsthread *thread; -  - @end the  - @implementationYyviewcontroller -  -- (void) Viewdidload + { - [Super Viewdidload]; +      A     //Creating Threads atSelf.thread=[[nsthread alloc]initwithtarget:self selector: @selector (Test)Object: nil]; -     //set the name of the thread -[Self.thread SetName:@"Thread A"]; - } - //when the finger is pressed, the thread is turned on --(void) Touchesbegan: (Nsset *) touches withevent: (Uievent *)Event in { -     //Open Thread to [Self.thread start]; + } -  the-(void) Test * { $     //Get ThreadPanax NotoginsengNsthread *current=[Nsthread CurrentThread]; -NSLog (@"Test---Print thread---%@", self.thread.name); theNSLog (@"Test---Thread starts---%@", current.name); +      A     //set thread to block 1, block for 2 seconds theNSLog (@"Next, the thread blocks for 2 seconds"); +[Nsthread Sleepfortimeinterval:2.0]; -     $     //The second set of threads blocks 2, blocking 4 seconds on the current time basis $NSLog (@"Next, the thread blocks for 4 seconds"); -NSDate *date=[nsdate Datewithtimeintervalsincenow:4.0]; - [Nsthread sleepuntildate:date]; the      for(intI=0; i< -; i++) { -NSLog (@"Thread--%d--%@", i,current.name);Wuyi         if(5==i) { the             //End Thread - [Nsthread exit]; Wu         } -  About     } $NSLog (@"Test---thread end---%@", current.name); - } -  - @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.