Linux多线程实例练习

Linux多线程实例练习 - pthread_cancel

1、代码 xx_pthread_cancel.c

#include <pthread.h>
#include <stdio.h>
#include <unistd.h>

#define debug_Msg(fmt, arg...)
    do{
        printf("%s %d : ", __FILE__, __LINE__);
        printf(fmt, ##arg);
    }while(0)

#define ENABLE_X
char * pe = "enable  return";
void * state_Enable(void *arg)
{
    int i = 0;
    int iExit = 0;
    while(i < 10 && iExit == 0)
    {
        debug_Msg("state Enable  : [%d]
", i);
        i++;
        sleep(1);
    }
    char * p = pe;
    return p;
}

#define DISABLE_X
char * pd = "disable return";
void * state_Disable(void * arg)
{
    pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
    int i = 0;
    int iExit = 0;
    while(i < 10 && iExit == 0)
    {
        debug_Msg("state Disable : [%d]
", i);
        i++;
        sleep(1);
    }
    char * p = pd;
    return p;
}

int main()
{
#ifdef ENABLE_X
    pthread_t pid;
    pthread_create(&pid, NULL, state_Enable, NULL);
    sleep(3);
    pthread_cancel(pid);
    void * p = NULL;
    printf("init with : [%08X]
", (unsigned int)p);
    pthread_join(pid, &p);
    printf("pe addr   : [%08X]
", (unsigned int)pe);
    printf("over with : [%08X]
", (unsigned int)p);
#endif

#ifdef DISABLE_X
    pthread_t pDis;
    pthread_create(&pDis, NULL, state_Disable, NULL);
    sleep(3);
    pthread_cancel(pDis);
    p = NULL;
    printf("init with : [%08X]
", (unsigned int)p);
    pthread_join(pDis, &p);
    printf("pd addr   : [%08X]
", (unsigned int)pd);
    printf("over with : [%08X]
", (unsigned int)p);
#endif
}

2、CentOS 编译通过

g++ -g -c -o xx_pthread_cancel.o xx_pthread_cancel.c 
g++ -g -o xx_pthread_cancel xx_pthread_cancel.o -lpthread

3、运行结果

$ ./xx_pthread_cancel 
xx_pthread_cancel.c 19 : state Enable  : [0]
xx_pthread_cancel.c 19 : state Enable  : [1]
xx_pthread_cancel.c 19 : state Enable  : [2]
init with : [00000000]
pe addr   : [08048959]
over with : [FFFFFFFF]
xx_pthread_cancel.c 36 : state Disable : [0]
xx_pthread_cancel.c 36 : state Disable : [1]
xx_pthread_cancel.c 36 : state Disable : [2]
init with : [00000000]
xx_pthread_cancel.c 36 : state Disable : [3]
xx_pthread_cancel.c 36 : state Disable : [4]
xx_pthread_cancel.c 36 : state Disable : [5]
xx_pthread_cancel.c 36 : state Disable : [6]
xx_pthread_cancel.c 36 : state Disable : [7]
xx_pthread_cancel.c 36 : state Disable : [8]
xx_pthread_cancel.c 36 : state Disable : [9]
pd addr   : [08048968]
over with : [08048968]