runlock

[channel.name]*channelsync.rwmutex}func NewServer () *server {s: = server{}s.dict = Make (Map[string]*Channel)// All Channelreturn s}//subscription func (SRV *server) Subscribe (client *client, channelname string) {//Customer is srv.rlock in the customer list of channel ( ) ch, found: = srv. Dict[channelname]srv. Runlock () if!found {ch = newchannel (channelname) ch. Addclient (client) srv. Lock () srv. Dict[channelname] = chsrv. Unlock ()} else {ch.

: = server{} s.dict = Make (Map[string]*channel)//All Channel return S}//Order Read func (SRV *server) Subscribe (client *client, channelname string) {//Customer is SRV in the channel's customer list. Rlock () ch, found: = srv. Dict[channelname] srv. Runlock () if!found {ch = newchannel (channelname) ch. Addclient (client) srv. Lock () srv. Dict[channelname] = ch srv. Unlock ()} else {ch. Addclient (Client)}}//unsubscribe func (SRV *server) unsubscrib

*rwmutex) Runlock () Func (rw *rwmutex) Unlock () Where the mutex is a mutex, lock () lock, Unlock () Unlock, use lock () lock, you can not lock it again, until it is unlocked with Unlock (), it can be locked again. For read-write uncertainty scenarios, where there is no obvious difference between read and write times, and only one read or write is allowed, the lock leaf is called a global lock. Func (M *mutex) Unlock () is used to unlock m, whi

This is a creation in Article, where the information may have evolved or changed. The Golang Sync package implements two types of lock mutexes (mutexes) and Rwmutex (read and write locks), where Rwmutex is implemented based on mutexes, and read-only locks are implemented using similar functions as reference counters. Type Mutex func (M *mutex) Lock () func (M *mutex) Unlock () type Rwmutex func (rw *rwmutex) Lock () func (rw *rwmutex

. Below is a simple logic for thread execution. Private final class Worker implements Runnable {Private final ReentrantLock runLock = new ReentrantLock ();Private Runnable firstTask;Thread thread;Worker (Runnable firstTask ){This. firstTask = firstTask;}Private void runTask (Runnable task ){Final ReentrantLock runLock = this. runLock;

not have a task and are in the waiting state to get the task from blockingqueue. But cannot interrupt those in the taskThe thread in the execution process, or the thread suspended during the execution of the task. Check the implementation code to find out the cause:Java code VoidInterruptifidle (){ FinalReentrantlock runlock = This. Runlock; If([B] runlock.

:25:36 runsync pos=02016-04-20 11:25:36 runlock pos=02016-04-20 11:25:37 runLock pos=12016-04-20 11:25:38 runlock pos=22016-04-20 11:25:39 runlock pos=32016-04-20 11:25:40 runlock pos=4As can be seen from the output, in the anonymous inner class, the lock operation of synchr

when there is a write lock. Func (rw *rwmutex) Unlock (): Write lock unlock, which causes a run-time error if no write lock is made. Func (rw *rwmutex) Rlock (): Read lock, when there is a write lock, cannot load read lock, when there is only read lock or no lock, can load read lock, read lock can load multiple, so it is suitable for "read more write less" scenario. Func (rw *rwmutex) Runlock (): Read lock unlock,

class worker implements runnable {/*** runs a single task between before/after methods. */private void runtask (runnable task) {final reentrantlock runlock = This. runlock; runlock. lock (); try {/** if pool is stopping ensure thread is interrupted; * If not, ensure thread is not interrupted. this requires * a double-check of State in case the interrupt was * cl

Runlock = new Reentrantlock (); void Interruptifidle () {final Reentrantlock runlock = This.runlock; if (Runlock.trylock ()) {try {if (hasrun thread!= thread.currentthread ()) Thread.Interrupt (); finally {Runlock.unlock (); }} void Interruptnow () {if (Hasrun) Thread.Interrupt (); public void Run () {try {Hasrun

that executes the task if (t!= null) { w.thread = t; The member Variable workers.add (w) that assigns the reference of the thread being created to W; int nt = ++poolsize; Current number of threads plus 1 if (NT > Largestpoolsize) largestpoolsize = NT; } return t; } In the Addthread method, you first create a worker object with the submitted task, and then call the thread factory threadfactory create a new t

. Rwmutex nodes map[string]bool seq []string random *rand. Rand}//Newdiscoveryimpl is a discovery implemented constructor func Newdiscoveryimpl () *discoveryimpl {di: = discoveryimpl{} DI.N Odes = Make (map[string]bool) Di.random = rand. New (Rand. Newsource (time. Now (). Unix ())) return di}//AddNode Add an address to Discovery list func (di *discoveryimpl) AddNode (address string) bool {di . Lock () defer di. Unlock () If _, OK: = di.nodes[address];!ok {di.seq = append (di.seq, address) di.no

, you can guarantee that only the lock can be unlocked.Here is the test code: 123456789101112131415161718192021st22232425262728293031323334353637 public class Testdlock {public static void Main (string[] args) throws Exception {Rmiserver rmiserver = new Localrmiserver ();Distributedlockimpl Distributedlock = new Distributedlockimpl ();Rmiserver.registerremoteobject ("Lock1", Distributedlock);Multithreadprocessor processor = new Multithreadprocessor ("AA");for (int i = 0; i Proce

Before you look at whatever code you want, first think about which parts of the thread pool should be: Task Queue Thread Task queue is very good, directly with the blocking queue can be:blockingqueueprivate final class Worker implements Runnable {private final Reentrantlock Runlock = new Re Entrantlock ();p rivate Runnable firsttask;volatile long completedtasks; Thread thread;//runs taskprivate void RunTask (Runnable Task) {final Ree

Before you look at whatever code you want, first think about which parts of the thread pool should be: Task Queue Thread The task queue is very good. The:blockingqueueprivate final class Worker implements Runnable {private final Reentrantlock Runlock = new Re Entrantlock ();p rivate Runnable firsttask;volatile long completedtasks; Thread thread;//runs taskprivate void RunTask (Runnable Task) {final Reentrantlock

(token string) { - lock. Lock () the defer lock. Unlock () -User: =Token[token]Wuyi user. Timer.stop () the Delete (token, token) - } Wu -Func GetUser (token string) (user *User, existoken bool) { About lock. Rlock () $ defer lock. Runlock () -User, Existoken =Token[token] - returnUser, Existoken -}token1 PackageNetwork2 3 Import (4"Logs"5"Time"6"Token"7 8"Github.com/gorilla/websocket"9 )Ten One type clientdata struct { AConn *WebSocket. Conn

-the-box effects.Header file:Class Rwmutex{public:rwmutex ();~rwmutex () = default;void Rlock ();Read lock void Runlock ();Read lock void Lock ();Write lock void Unlock ();Write lock Private:srwlock Lock_;private:rwmutex (const rwmutex) = delete; void operator= (const rwmutex) = delete;};The corresponding source file:Rwmutex::rwmutex () {:: Initializesrwlock (lock_);} void Rwmutex::rlock () {:: Acquiresrwlockshared (lock_);} void Rwmutex::

(interface{}), which is a function type, the parameter of the function type is a interface{ }, which is an empty interface, because any type can be considered to implement an empty interface, so you can receive any type of argument here. That is, the type of f is a function type that can receive any type of argument. A bit around, need to calm down to understand oh ~ The source code is as follows: 1//keepalivemarksanitemtobekeptforanother Expiredurationperiod. 2//"Update Accessedon to Current

, use mutual exclusion locks: var// guards icons// Concurrency-safe.funcstring) image.Image { mu.Lock() defer mu.Unlock() ifnil { loadIcons() } return icons[name]} However, the problem is that after icons is initialized, subsequent read operations cannot be performed in parallel. Solution two use a read-write lock var mu sync. Rwmutex //guards icons var icons map [string ]image. Image//concurrency-safe. func Icon (name string ) image. Image {mu. Rlock () if icons! =

(*rwmutex) Rlock Func (*rwmutex) Runlock The name and signature of the first pair of methods are exactly the same as the two methods of the mutex. They represent the lock and unlock of the write operation respectively. For short, they are write locks and write unlocks. The latter pair of methods represent the lock and unlock of the read operation respectively. Hereinafter referred to as read lock and read unlock. Writing locks on read-wr