Shell Programming and Scripting

#!/bin/ksh
 
/* cc thisfile.c -lthread -lpthread */
       #define _REENTRANT    /* basic 3-lines for threads */
       #include <pthread.h>
       #include <thread.h>
       #define NUM_THREADS 5
       #define SLEEP_TIME 10
       void *sleeping(void *);   /* thread routine */
       int i;
       thread_t tid[NUM_THREADS];      /* array of thread IDs */
       int
       main(int argc, char *argv[])
       {
           if (argc == 1)  {
               printf("use 0 as arg1 to use pthread_create()\n");
               printf("or use 1 as arg1 to use thr_create()\n");
               return (1);
           }
           switch (*argv[1])  {
           case '0':  /* POSIX */
               for ( i = 0; i < NUM_THREADS; i++)
                   pthread_create(&tid[i], NULL, sleeping,
                       (void *)SLEEP_TIME);
               for ( i = 0; i < NUM_THREADS; i++)
                   pthread_join(tid[i], NULL);
               break;
           case '1':  /* Solaris */
               for ( i = 0; i < NUM_THREADS; i++)
                   thr_create(NULL, 0, sleeping, (void *)SLEEP_TIME, 0,
                       &tid[i]);
               while (thr_join(0, NULL, NULL) == 0)
                   ;
               break;
           }  /* switch */
           printf("main() reporting that all %d threads have
               terminated\n", i);
           return (0);
       }  /* main */
       void *
       sleeping(void *arg)
       {
           int sleep_time = (int)arg;
           printf("thread %d sleeping %d seconds ...\n", thr_self(),
               sleep_time);
           sleep(sleep_time);
           printf("\nthread %d awakening\n", thr_self());
           return (NULL);
       }

$ time ./a.out 1
./a.out[10]: syntax error at line 10 : `(' unexpected

void *sleeping(void *);

cc thisfile.c -lthread -lpthread

./a.out 0

./a.out 1