compiler-rt/test/tsan/signal_thread2.cpp

   1 // RUN: %clangxx_tsan %s -o %t && %run %t 2>&1 | FileCheck %s
   2 // UNSUPPORTED: darwin
   3
   4 // It's very flaky on PPC with COMPILER_RT_DEBUG.
   5 // UNSUPPORTED: !compiler-rt-optimized && ppc
   6
   7 // Test case for https://github.com/google/sanitizers/issues/1540
   8
   9 #include <errno.h>
  10 #include <pthread.h>
  11 #include <signal.h>
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <sys/time.h>
  15 #include <sys/types.h>
  16 #include <unistd.h>
  17
  18 volatile int X;
  19
  20 static void handler(int sig) {
  21   (void)sig;
  22   if (X != 0)
  23     printf("bad");
  24 }
  25
  26 static void *thr1(void *p) {
  27   sleep(1);
  28   return 0;
  29 }
  30
  31 static void *thr(void *p) {
  32   pthread_t th[10];
  33   for (int i = 0; i < sizeof(th) / sizeof(th[0]); i++)
  34     pthread_create(&th[i], 0, thr1, 0);
  35   for (int i = 0; i < sizeof(th) / sizeof(th[0]); i++)
  36     pthread_join(th[i], 0);
  37   return 0;
  38 }
  39
  40 int main() {
  41   struct sigaction act = {};
  42   act.sa_handler = &handler;
  43   if (sigaction(SIGPROF, &act, 0)) {
  44     perror("sigaction");
  45     exit(1);
  46   }
  47
  48   itimerval t;
  49   t.it_value.tv_sec = 0;
  50   t.it_value.tv_usec = 10;
  51   t.it_interval = t.it_value;
  52   if (setitimer(ITIMER_PROF, &t, 0)) {
  53     perror("setitimer");
  54     exit(1);
  55   }
  56
  57   pthread_t th[100];
  58   for (int i = 0; i < sizeof(th) / sizeof(th[0]); i++)
  59     pthread_create(&th[i], 0, thr, 0);
  60   for (int i = 0; i < sizeof(th) / sizeof(th[0]); i++)
  61     pthread_join(th[i], 0);
  62
  63   fprintf(stderr, "DONE\n");
  64   return 0;
  65 }
  66
  67 // CHECK-NOT: WARNING: ThreadSanitizer:
  68 // CHECK: DONE
  69 // CHECK-NOT: WARNING: ThreadSanitizer: