轮询方式实现线程间共享变量

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#include <pthread.h>#include <stdio.h>#include <stdlib.h>int flag = 1;void *thread_function(void *arg);int main(){    int res;    pthread_t a_thread;    void *thread_result;    int count = 1;    res = pthread_create(&a_thread, NULL, thread_function, NULL);    if (res != 0)    {        perror("Thread creation failed");        exit(EXIT_FAILURE);    }    while (count++ <= 20)    {        if (flag == 1)        {            printf ("1\n");            flag = 2;        }        else        {            sleep(1);        }    }    printf("/nWaiting for thread to finish...\n");    res = pthread_join(a_thread, &thread_result);    printf("/nthread finished.../n");    if (res != 0)    {        perror("Thread join failed");        exit(EXIT_FAILURE);    }    exit(EXIT_SUCCESS);}void *thread_function(void *arg){    int count = 1;    while (count++ <= 30)    {        if (flag == 2)        {            printf("2\n");            flag = 1;        }        else        {            sleep(1);        }    }}