Multi-threading and network development for iOS multi-threaded Nsthread

Last Update:2015-07-10 Source: Internet

Author: User

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Shimen The main contribution, respect the work of the author, please do not reprint.If the article is helpful to you, you are welcome to donate to the author, support the Shimen, donate the amount at random, ^_^ I want to donate: click DonateCocos2d-x source Download: Dot I teleportGames official Download:HTTP://DWZ.CN/RWTJLGame Video Preview:http://dwz.cn/RzHHdgame development Blog:Http://dwz.cn/RzJzIGame Source Transfer : Http://dwz.cn/Nret1 Basic use of A.nsthread1. Creating and starting ThreadsA Nsthread object represents a thread creating, Starting Threads Nsthread *thread = [[nsthread alloc] initwithtarget:self selector: @selector (run) object:nil]; [thread start]; When a thread is started, the Run method of self is executed in threads thread Main thread related usage + (nsthread *) mainthread; Get the main thread -(BOOL) ismainthread; is the main thread + (BOOL) ismainthread; is the main thread 2. Other MethodsGet current thread Nsthread *current = [nsthread currentthread]; Scheduling Priority for Threads + (double) threadpriority; + (BOOL) setthreadpriority: (double) p; -(double) threadpriority; -(BOOL) setthreadpriority: (double) p; The scheduling priority value range is 0.0 ~ 1.0, The default 0.5, the higher the value, the higher the priority The name of the thread -(void) setName: (nsstring *) n; -(nsstring *) name; 3. Other ways to create threadsautomatically start a thread after creating a thread [nsthread detachnewthreadselector: @selector (run) totarget:self withobject:nil]; Implicitly creating and starting a thread [self performselectorinbackground: @selector (run) withobject:nil]; Pros and cons of the above 2 ways to create threads Advantages: Simple and fast Cons: Unable to set the thread in more detail 4. Thread Life cycle 5. Control Thread TurntableStart thread -(void) start; Go to Ready status, run Status. Automatically enters the death state when the thread task is completed Blocking (pausing) Threads + (void) sleepuntildate: (nsdate *) date; + (void) sleepfortimeinterval: (nstimeinterval) ti; Enter blocking state Force Stop Thread + (void) exit; Into the state of death Note: once the thread has stopped (dead), it cannot be opened Again. 6. Multi-threaded Security RisksResource sharing 1 of resources may be shared by multiple threads, that is, multiple threads may access the same block of resources For example, multiple threads access the same object, the same variable, the same file Data confusion and data security issues can easily arise when multiple threads access the same resource 7. Mutex (to prevent multi-threaded resource Looting)(1) the use of the mutex lock format @synchronized (lock Object) {//code to be locked} Note: locking 1 parts of code with only 1 locks, with multiple locks is not valid Advantages and disadvantages of mutual exclusion lock Advantages: it can effectively prevent the data security problem caused by multi-thread snatch resource Cons: consumes a lot of CPU resources Use of mutexes: multiple threads rob the same piece of resources Related professional terminology: thread synchronization Thread synchronization means that multiple threads perform tasks sequentially Mutex is the use of thread synchronization technology (2) Locking @synchronized@property (nonatomic, Strong) nsobject *lock;Self.lock = [[nsobject alloc] init]@synchronized (self.lock) {...}note: to use the same "lock" to properly lock code resources advantages: effectively prevent multi-thread snatch resourcesCons: consumes a lot of CPU resources in fact, the member property modifier Atomic lock, which is the defaultso we generally use nonatomic to improve performance try to avoid multi-thread snatch resourcesif possible, dispose of the looting resources to the server Side. (3) about atomic and nonatomic modifiersOC has nonatomic and atomic two choices when defining attributes Atomic: Atomic attribute, locking for Setter method (default is Atomic) Nonatomic: non-atomic attribute, does not lock the setter method Atomic Plus Lock principle @property (assign, Atomic) int age; -(void) Setage: (int) Age { @synchronized (self) { _age = age; } } (4) Atomic vs nonatomicComparison of Nonatomic and atomic Atomic: thread-safe, requires a lot of resources Nonatomic: non-thread-safe, suitable for small memory mobile devices Recommendations for iOS development All properties are declared as Nonatomic Try to avoid multiple threads robbing the same piece of resources As far as possible to locking, resource-grabbing business logic to the Server-side processing, reduce the pressure of mobile clients 8. Inter-thread CommunicationWhat is called Inter-thread communication In 1 processes, threads often do not exist in isolation and require frequent communication between multiple threads The embodiment of inter-thread communication 1 Threads pass data to another 1 threads After performing a specific task in 1 threads, go to another 1 thread to continue the task Common methods for inter-thread communication -(void) performselectoronmainthread: (SEL) aselector withobject: (id) arg waituntildone: (BOOL) wait; -(void) performselector: (SEL) aselector onthread: (nsthread *) thr withobject: (id) arg waituntildone: (BOOL) wait; Shimen The main contribution, respect the work of the author, please do not reprint.If the article is helpful to you, you are welcome to donate to the author, support the Shimen, donate the amount at random, ^_^ I want to donate: click DonateCocos2d-x source Download: Dot I teleportGames official Download:HTTP://DWZ.CN/RWTJLGame Video Preview:http://dwz.cn/RzHHdgame development Blog:Http://dwz.cn/RzJzIGame Source Transfer : Http://dwz.cn/Nret1 Copyright Notice: This article for Bo Master original article, without Bo Master permission not Reproduced. Multithreaded Nsthread for iOS multi-threading and network development

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