线程清理

线程清理. 安排线程退出时需要调用的清理函数

例: 

mypthread_cleanup.c

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

//gcc -g mypthread_cleanup.c -o mypthread_cleanup -lpthread

#define ERROR(flag,msg)            \
if(flag)                        \
{                                \
    printf("%d: ",__LINE__);    \
    fflush(stdout);                \
    perror(msg);                \
    exit(errno);                \
}

void clean(void *arg)
{
    puts(arg);
}

void *pthread_func(void *arg)
{
    pthread_cleanup_push(clean,"i'm cleaning 00000000000000000000");
    pthread_cleanup_push(clean,"i'm cleaning 11111111111111111111");

    sleep(100000);

    pthread_cleanup_pop(1);
    pthread_cleanup_pop(0);
    return NULL;
}

int main(int argc, char *argv[])
{
    pthread_t tid;
    
    int ret = pthread_create(&tid,NULL,pthread_func,NULL);
    ERROR(ret != 0,"pthread_create()");
    sleep(1);
    pthread_cancel(tid);
    sleep(1);

    int stat;
    pthread_join(tid,(void **)&stat);
    printf("exit code = %d\n",stat);

    return 0;
}

编译链接运行, 输出如下: