helgrind/tests/tc02_simple_tls.c

   1
   2 #include <pthread.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5
   6 /* Simple test program, no race: parent only modified x after child
   7    has modified it and then joined with the parent.  Tests simple
   8    thread lifetime segment handling. */
   9
  10 int x = 0;
  11
  12 void* child_fn ( void* arg )
  13 {
  14    /* Unprotected relative to parent, but in child's segment only */
  15    x++;
  16    return NULL;
  17 }
  18
  19 int main ( void )
  20 {
  21    pthread_t child;
  22
  23    x++; /* happens in parent's segment */
  24
  25    if (pthread_create(&child, NULL, child_fn, NULL)) {
  26       perror("pthread_create");
  27       exit(1);
  28    }
  29
  30    if (pthread_join(child, NULL)) {
  31       perror("pthread join");
  32       exit(1);
  33    }
  34
  35    /* Now back in parent's segment */
  36    x++;
  37
  38    return 0;
  39 }