compiler-rt/test/tsan/Linux/fork_syscall.cpp

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %env_tsan_opts=atexit_sleep_ms=50 %run %t 2>&1 | FileCheck %s
   2 #include "../test.h"
   3 #include "syscall.h"
   4 #include <errno.h>
   5 #include <sys/types.h>
   6 #include <sys/wait.h>
   7
   8 int counter;
   9
  10 static void *incrementer(void *p) {
  11   for (;;)
  12     __sync_fetch_and_add(&counter, 1);
  13   return 0;
  14 }
  15
  16 int main() {
  17   pthread_t th1;
  18   pthread_create(&th1, 0, incrementer, 0);
  19   for (int i = 0; i < 10; i++) {
  20     switch (myfork()) {
  21     default: // parent
  22       while (wait(0) < 0) {
  23       }
  24       fprintf(stderr, ".");
  25       break;
  26     case 0: // child
  27       __sync_fetch_and_add(&counter, 1);
  28       exit(0);
  29       break;
  30     case -1: // error
  31       fprintf(stderr, "failed to fork (%d)\n", errno);
  32       exit(1);
  33     }
  34   }
  35   fprintf(stderr, "OK\n");
  36 }
  37
  38 // CHECK: OK