zhtread c++多线程库的使用5: 线程的本地化存储

消除线程在共享资源上的冲突的一个办法是消除共享的资源变量 ，因而就可以对同一对象的不同线程分配不同的存储单元

 

这是由threadloca模板来实现的

 

如下所示

#include <iostream>#include "zthread/Thread.h"#include "zthread/Mutex.h"#include "zthread/Guard.h"#include "zthread/ThreadedExecutor.h"#include "zthread/Cancelable.h"#include "zthread/ThreadLocal.h"#include "zthread/CountedPtr.h"#include <stdlib.h>using namespace ZThread;using namespace std;#pragma comment(lib,"ZThread_D.lib")//线程的本地化存储变量class ThreadLocalVariables : public Cancelable { //本地化存储的模板 ThreadLocal<int> value; bool canceled; //?? Mutex lock;public: ThreadLocalVariables() : canceled(false) { value.set(0); } void increment() { value.set(value.get() + 1); } int get() { return value.get(); } void cancel() {Guard<Mutex> g(lock);canceled = true; }bool isCanceled() {Guard<Mutex> g(lock);return canceled; }};class Accessor : public Runnable {int id;//引用计数指针CountedPtr<ThreadLocalVariables> tlv;public:Accessor(CountedPtr<ThreadLocalVariables>& tl, int idn): id(idn), tlv(tl) {} //重载run方法void run() {while(!tlv->isCanceled()) { tlv->increment(); cout << *this << endl; _sleep(20);}}friend ostream&operator<<(ostream& os, Accessor& a) {return os << "#" << a.id << ": " << a.tlv->get();}};int main() {cout << "Press <Enter> to quit" << endl;try {CountedPtr<ThreadLocalVariables>tlv(new ThreadLocalVariables);const int SZ = 2;ThreadedExecutor executor;for(int i = 0; i < SZ; i++)executor.execute(new Accessor(tlv, i));cin.get();tlv->cancel(); // All Accessors will quit} catch(Synchronization_Exception& e) {cerr << e.what() << endl;}_sleep(1234);} ///:~

 

代码先放这里 虽然一下子没看懂