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