c - pthread programming, threads don't run simultaneously -

i've following code in programm:

for (i = 0; < numthrs; i++) {       if (0 != pthread_create(&thrs[i], null, thr_main,                 &args[i]))     {         /* handle error */     }      printf("thread %d created.\n", i);      if (0 != pthread_join(thrs[i], &thread_status))     {         /* handle error */     }      printf("joined thread %d\n", i); } 

but i've noticed threads don't run simultaneously, second thread starts execution after first thread has completed execution. i'm new pthread programming. can tell me what's proper way start threads simultaneously?

this because pthread_join each thread after creating it, i.e. waiting thread n complete prior starting thread n+1.

instead, try:

for (i = 0; < numthrs; i++) {     if (0 != pthread_create(&thrs[i], null, thr_main,                 &args[i]))     {         /* handle error */     }      printf("thread %d created.\n", i); }  (i = 0; < numthrs; i++) {     if (0 != pthread_join(thrs[i], &thread_status))     {         /* handle error */     }      printf("joined thread %d\n", i); }