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

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %env_tsan_opts=atexit_sleep_ms=0 %run %t 2>&1 | FileCheck %s
   2 #include "../test.h"
   3 #include <errno.h>
   4 #include <sched.h>
   5 #include <sys/types.h>
   6 #include <sys/wait.h>
   7
   8 long counter;
   9
  10 static void *incrementer(void *arg) {
  11   for (;;)
  12     __sync_fetch_and_add(&counter, 1);
  13   return 0;
  14 }
  15
  16 static int cloned(void *arg) {
  17   for (int i = 0; i < 1000; i++)
  18     __sync_fetch_and_add(&counter, 1);
  19   exit(0);
  20   return 0;
  21 }
  22
  23 int main() {
  24   barrier_init(&barrier, 2);
  25   pthread_t th;
  26   pthread_create(&th, 0, incrementer, 0);
  27   for (int i = 0; i < 100; i++) {
  28     char stack[64 << 10] __attribute__((aligned(64)));
  29     int pid = clone(cloned, stack + sizeof(stack), SIGCHLD, 0);
  30     if (pid == -1) {
  31       fprintf(stderr, "failed to clone: %d\n", errno);
  32       exit(1);
  33     }
  34     while (wait(0) != pid) {
  35     }
  36   }
  37   fprintf(stderr, "DONE\n");
  38 }
  39
  40 // CHECK: DONE