c语言基础:pthread_create

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#include <stdio.h> #include <stdlib.h> #include <time.h> #include <pthread.h>    static void myfopen(void) {     FILE *fp = fopen("/tmp/appContext", "w+");       if (fp != NULL) {         fprintf(fp, "test1\n");         fprintf(fp, "test2\n");         fprintf(fp, "test3\n");         fprintf(fp, "test4\n");         fprintf(fp, "test5\n");         fprintf(fp, "test6\n");         fclose(fp);     } }   static void wait_thread(void) {     time_t start_time = time(NULL);        while (time(NULL) == start_time)     {         // do nothing except chew CPU slices for up to one second.     } }    static void *thread_func(void *vptr_args) {     int i;        for (i = 0; i < 20; i++) {         fputs("  b\n", stderr);         wait_thread();     }        return NULL; }    int main(void) {     int i;     pthread_t thread;        if (pthread_create(&thread, NULL, thread_func, NULL) != 0)         return EXIT_FAILURE;        for (i = 0; i < 20; i++) {         fputs("a\n", stdout);     myfopen();         wait_thread();     }        if (pthread_join(thread, NULL) != 0)         return EXIT_FAILURE;        return EXIT_SUCCESS; }