windows Thread Synchronization

Use WaitForSingleObject function & WaitForMultipleObjects function

#include <stdio.h>
#include <windows.h>
#include <process.h>

unsigned WINAPI ThreadFunc(void *arg);

int main(int argc, char *argv[])
{
    HANDLE  hThread;
    DWORD wr;
    unsigned threadID;
    int param = 5;

    hThread = (HANDLE)_beginthreadex(NULL, 0, ThreadFunc, (void *)&param, 0, &threadID);
    if((wr = WaitForSingleObject(hThread, INFINITE)) == WAIT_FAILED)
    {
        puts("thread wait error");
        return -1;
    }

    printf("wait result: %s \n", (wr == WAIT_OBJECT_0) ? "signaled" : "time-out");
    puts("end of main");
    return 0;
}

unsigned WINAPI ThreadFunc(void *arg)
{
    int i;
    int cnt = *((int *)arg);
    for(i = 0; i < cnt; i ++)
    {
        Sleep(1000);
        puts("running thread");
    }
    return 0;
}

　　

#include <stdio.h>

#include <windows.h>

#include <process.h>

#define NUM_THREAD 50

unsigned WINAPI threadInc(void *arg);

unsigned WINAPI threadDec(void *arg);

long long num = 0;

int main(int argc, char *argv[])

{

    HANDLE  tHandles[NUM_THREAD];

    int i;

    printf("sizeof long long: %d \n", sizeof(long long));

    for(i = 0; i < NUM_THREAD; i ++)

    {

        if(i % 2)

            tHandles[i] = (HANDLE)_beginthreadex(NULL, 0, threadInc, NULL, 0, NULL);

        else

            tHandles[i] = (HANDLE)_beginthreadex(NULL, 0, threadDec, NULL, 0, NULL);

    }

    WaitForMultipleObjects(NUM_THREAD, tHandles, TRUE, INFINITE);

    printf("result: %lld \n", num);

    return 0;

}

unsigned WINAPI threadInc(void *arg)

{

    int i;

    for(i = 0; i < 50000000; i ++)

        a + = 1;

    return 0;

}

unsigned WINAPI threadDec(void *arg)

{

    int i;

    for(i = 0; i < 50000000; i ++)

        a - = 1;

    return 0;

}