Windows tls 测试

一、概念

tls：Thread Local Storage，是Windows为解决一个进程中多个线程同时访问全局变量而提供的机制。

二、简单使用

1.测试代码

#include "stdio.h"#include <WTypes.h>static DWORD tls_index = 0;static bool is_show_thread_begin = false;static bool is_finish_work = false;#define print_tls(module,index,value) \    printf("%s module , index %u, value %d\n", module, index, value)DWORD WINAPI my_thread_work(LPVOID){    while(!is_show_thread_begin)        Sleep(100);    TlsSetValue(tls_index, (LPVOID)0);    int value = 0;    while((value = (int)TlsGetValue(tls_index)) < 3) {        Sleep(1000);        value++;        TlsSetValue(tls_index, (LPVOID)value);        print_tls("===my_thread_work", tls_index, (int)TlsGetValue(tls_index));    }    is_finish_work = true;;    return 0;}DWORD WINAPI my_thread_show(LPVOID){    is_show_thread_begin = true;    while(!is_finish_work)    {        print_tls("my_thread_show", tls_index, (int)TlsGetValue(tls_index));        Sleep(1000);    }    return 0;}int main(int argc, char **argv){    tls_index = TlsAlloc(); // 申请线程局部变量    if (TLS_OUT_OF_INDEXES != tls_index)    {        TlsSetValue(tls_index, (LPVOID)1000);        print_tls("main", tls_index, (int)TlsGetValue(tls_index));        HANDLE hWork = CreateThread(NULL, 0, my_thread_work, (LPVOID)0, 0, NULL);        HANDLE hShow = CreateThread(NULL, 0, my_thread_show, (LPVOID)1, 0, NULL);        WaitForSingleObject(hWork, INFINITE);        WaitForSingleObject(hShow, INFINITE);        print_tls("main", tls_index, (int)TlsGetValue(tls_index));        TlsFree(tls_index); // 释放线程局部变量    }    else    {        printf("out of tls indexs");    }    return 0;}

2.运行结果