多线程Semaphore技术

 

使用Semaphore同步线程：

#include <windows.h>
#include <stdlib.h>
#include <stdio.h>
#include <TCHAR.h>

DWORD WINAPI ThreadFun(LPVOID);
#define THREAD_POOL_SIZE 5
HANDLE MySem;


int main(){
    HANDLE hThrds[THREAD_POOL_SIZE];
    int slot=0;
    DWORD threadId[THREAD_POOL_SIZE];
    int i;
    DWORD rc;
    long len;

    MySem = CreateSemaphore(NULL, 2, 5, _T("MySem"));
    
    for(i=0;i<THREAD_POOL_SIZE;i++){
        hThrds[i]=CreateThread(NULL, 0, ThreadFun, (LPVOID)i, 0, &threadId[i]);
        if(hThrds[i]) {
            printf("Thread %d lanched \n", i);
        }
    }
    
    rc = WaitForMultipleObjects(THREAD_POOL_SIZE, hThrds, true, INFINITE);
    
    slot = rc - WAIT_OBJECT_0;
    if(slot>=0 && slot<THREAD_POOL_SIZE) printf("All thread terminite\n");

    CloseHandle(MySem);
    for(i=0;i<THREAD_POOL_SIZE;i++){
        CloseHandle(hThrds[i]);
    }
    return 0;
}

DWORD WINAPI ThreadFun(LPVOID n){
    int i;
    long len;
    WaitForSingleObject(MySem, INFINITE);
    for(i=0;i<5;i++){
        printf("t%d do %d\n", n, i);
        Sleep(1000);
        
    }
    ReleaseSemaphore(MySem, 1, &len);
    printf("Thread %d terminate\n", n);
    return 0;
}