helgrind/tests/pth_mempcpy_false_races.c

   1 /* Related bugs:
   2  *   https://bugs.kde.org/show_bug.cgi?id=352130
   3  *   https://bugs.kde.org/show_bug.cgi?id=450962
   4  * This reproducer has no real race conditions but since helgrind doesn't see
   5  * or know about the glibc internal locking done for FILE *state, it will report
   6  * a race when several threads run printf due to this fact.
   7  */
   8
   9 #include <stdio.h>
  10 #include <pthread.h>
  11
  12 pthread_t thread;
  13
  14 void* thread3 (void* d)
  15 {
  16   int count3 = 0;
  17
  18   while(count3 < 100){
  19     printf("Thread 3: %d\n", count3++);
  20   }
  21   return NULL;
  22 }
  23
  24 void* thread2 (void* d)
  25 {
  26   int count2 = 0;
  27
  28   while(count2 < 1000){
  29           //
  30     printf("Thread 2: %d\n", count2++);
  31   }
  32   return NULL;
  33 }
  34
  35 int main (){
  36
  37   pthread_create (&thread, NULL, thread2, NULL);
  38   pthread_create (&thread, NULL, thread3, NULL);
  39
  40   //Thread 1
  41   int count1 = 0;
  42
  43   while(count1 < 10){
  44     printf("Thread 1: %d\n", count1++);
  45   }
  46
  47   pthread_join(thread,NULL);
  48   return 0;
  49 }
  50