Stephen Hines | 86277eb | 2015-03-23 12:06:32 -0700 | [diff] [blame] | 1 | // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s |
| 2 | #include <pthread.h> |
| 3 | #include <stdio.h> |
| 4 | #include <stdlib.h> |
| 5 | #include <signal.h> |
| 6 | #include <sys/types.h> |
| 7 | #include <sys/time.h> |
| 8 | #include <unistd.h> |
| 9 | #include <errno.h> |
| 10 | |
| 11 | volatile int X; |
| 12 | int stop; |
| 13 | |
| 14 | static void handler(int sig) { |
| 15 | (void)sig; |
| 16 | if (X != 0) |
| 17 | printf("bad"); |
| 18 | } |
| 19 | |
| 20 | static void* busy(void *p) { |
| 21 | while (__atomic_load_n(&stop, __ATOMIC_RELAXED) == 0) { |
| 22 | } |
| 23 | return 0; |
| 24 | } |
| 25 | |
| 26 | static void* reset(void *p) { |
| 27 | struct sigaction act = {}; |
| 28 | for (int i = 0; i < 1000000; i++) { |
| 29 | act.sa_handler = &handler; |
| 30 | if (sigaction(SIGPROF, &act, 0)) { |
| 31 | perror("sigaction"); |
| 32 | exit(1); |
| 33 | } |
| 34 | act.sa_handler = SIG_IGN; |
| 35 | if (sigaction(SIGPROF, &act, 0)) { |
| 36 | perror("sigaction"); |
| 37 | exit(1); |
| 38 | } |
| 39 | } |
| 40 | return 0; |
| 41 | } |
| 42 | |
| 43 | int main() { |
| 44 | struct sigaction act = {}; |
| 45 | act.sa_handler = SIG_IGN; |
| 46 | if (sigaction(SIGPROF, &act, 0)) { |
| 47 | perror("sigaction"); |
| 48 | exit(1); |
| 49 | } |
| 50 | |
| 51 | itimerval t; |
| 52 | t.it_value.tv_sec = 0; |
| 53 | t.it_value.tv_usec = 10; |
| 54 | t.it_interval = t.it_value; |
| 55 | if (setitimer(ITIMER_PROF, &t, 0)) { |
| 56 | perror("setitimer"); |
| 57 | exit(1); |
| 58 | } |
| 59 | |
| 60 | pthread_t th[2]; |
| 61 | pthread_create(&th[0], 0, busy, 0); |
| 62 | pthread_create(&th[1], 0, reset, 0); |
| 63 | |
| 64 | pthread_join(th[1], 0); |
| 65 | __atomic_store_n(&stop, 1, __ATOMIC_RELAXED); |
| 66 | pthread_join(th[0], 0); |
| 67 | |
| 68 | fprintf(stderr, "DONE\n"); |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | // CHECK-NOT: WARNING: ThreadSanitizer: |
| 73 | // CHECK: DONE |
| 74 | // CHECK-NOT: WARNING: ThreadSanitizer: |