compiler-rt/test/tsan/signal_sync.cpp

   1 // RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
   2 // UNSUPPORTED: darwin
   3 #include "test.h"
   4 #include <signal.h>
   5 #include <sys/types.h>
   6 #include <sys/time.h>
   7 #include <errno.h>
   8
   9 volatile int X;
  10
  11 static void handler(int sig) {
  12   (void)sig;
  13   if (X != 42)
  14     printf("bad");
  15 }
  16
  17 static void* thr(void *p) {
  18   for (int i = 0; i != 1000; i++)
  19     usleep(1000);  // process signals
  20   return 0;
  21 }
  22
  23 int main() {
  24   const int kThreads = 10;
  25   pthread_t th[kThreads];
  26   for (int i = 0; i < kThreads; i++)
  27     pthread_create(&th[i], 0, thr, 0);
  28
  29   X = 42;
  30
  31   struct sigaction act = {};
  32   act.sa_handler = &handler;
  33   if (sigaction(SIGPROF, &act, 0)) {
  34     perror("sigaction");
  35     exit(1);
  36   }
  37
  38   itimerval t;
  39   t.it_value.tv_sec = 0;
  40   t.it_value.tv_usec = 10;
  41   t.it_interval = t.it_value;
  42   if (setitimer(ITIMER_PROF, &t, 0)) {
  43     perror("setitimer");
  44     exit(1);
  45   }
  46
  47   for (int i = 0; i < kThreads; i++)
  48     pthread_join(th[i], 0);
  49
  50   fprintf(stderr, "DONE\n");
  51   return 0;
  52 }
  53
  54 // CHECK-NOT: WARNING: ThreadSanitizer:
  55 // CHECK: DONE
  56 // CHECK-NOT: WARNING: ThreadSanitizer: