compiler-rt/test/tsan/signal_in_read.c

   1 // RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
   2
   3 #include "test.h"
   4
   5 #include <assert.h>
   6 #include <errno.h>
   7 #include <pthread.h>
   8 #include <signal.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <unistd.h>
  12
  13 static int SignalPipeFd[] = {-1, -1};
  14 static int BlockingPipeFd[] = {-1, -1};
  15
  16 static void Handler(int _) { assert(write(SignalPipeFd[1], ".", 1) == 1); }
  17
  18 static void *ThreadFunc(void *_) {
  19   char C;
  20   assert(read(BlockingPipeFd[0], &C, sizeof(C)) == 1);
  21   assert(C == '.');
  22   return 0;
  23 }
  24
  25 int main() {
  26   alarm(60); // Kill the test if it hangs.
  27
  28   assert(pipe(SignalPipeFd) == 0);
  29   assert(pipe(BlockingPipeFd) == 0);
  30
  31   struct sigaction act;
  32   sigemptyset(&act.sa_mask);
  33   act.sa_flags = SA_RESTART;
  34   act.sa_handler = Handler;
  35   assert(sigaction(SIGUSR1, &act, 0) == 0);
  36
  37   pthread_t Thr;
  38   assert(pthread_create(&Thr, 0, ThreadFunc, 0) == 0);
  39
  40   // Give the thread enough time to block in the read call.
  41   usleep(1000000);
  42
  43   // Signal the thread, this should run the signal handler and unblock the read
  44   // below.
  45   pthread_kill(Thr, SIGUSR1);
  46   char C;
  47   assert(read(SignalPipeFd[0], &C, 1) == 1);
  48
  49   // Unblock the thread and join it.
  50   assert(write(BlockingPipeFd[1], &C, 1) == 1);
  51   void *_ = 0;
  52   assert(pthread_join(Thr, &_) == 0);
  53
  54   fprintf(stderr, "PASS\n");
  55   return 0;
  56 }
  57
  58 // CHECK-NOT: WARNING: ThreadSanitizer:
  59 // CHECK: PASS