| // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s |
| // UNSUPPORTED: darwin |
| // Fails episodically on powerpc bots: |
| // https://lab.llvm.org/buildbot/#/builders/121/builds/13391 |
| // UNSUPPORTED: target=powerpc64{{.*}} |
| #include "test.h" |
| #include <errno.h> |
| #include <signal.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| |
| // Test synchronization in signal handled within IgnoreSync region. |
| |
| const int kSignalCount = 500; |
| |
| __thread int process_signals; |
| int signals_handled; |
| int done; |
| int ready[kSignalCount]; |
| long long data[kSignalCount]; |
| |
| static void handler(int sig) { |
| if (!__atomic_load_n(&process_signals, __ATOMIC_RELAXED)) |
| return; |
| int pos = signals_handled++; |
| if (pos >= kSignalCount) |
| return; |
| data[pos] = pos; |
| __atomic_store_n(&ready[pos], 1, __ATOMIC_RELEASE); |
| } |
| |
| static void* thr(void *p) { |
| AnnotateIgnoreSyncBegin(__FILE__, __LINE__); |
| __atomic_store_n(&process_signals, 1, __ATOMIC_RELAXED); |
| while (!__atomic_load_n(&done, __ATOMIC_RELAXED)) { |
| } |
| AnnotateIgnoreSyncEnd(__FILE__, __LINE__); |
| return 0; |
| } |
| |
| int main() { |
| struct sigaction act = {}; |
| act.sa_handler = handler; |
| if (sigaction(SIGPROF, &act, 0)) { |
| perror("sigaction"); |
| exit(1); |
| } |
| itimerval t; |
| t.it_value.tv_sec = 0; |
| t.it_value.tv_usec = 10; |
| t.it_interval = t.it_value; |
| if (setitimer(ITIMER_PROF, &t, 0)) { |
| perror("setitimer"); |
| exit(1); |
| } |
| |
| pthread_t th; |
| pthread_create(&th, 0, thr, 0); |
| for (int pos = 0; pos < kSignalCount; pos++) { |
| while (__atomic_load_n(&ready[pos], __ATOMIC_ACQUIRE) == 0) { |
| } |
| if (data[pos] != pos) { |
| printf("at pos %d, expect %d, got %lld\n", pos, pos, data[pos]); |
| exit(1); |
| } |
| } |
| __atomic_store_n(&done, 1, __ATOMIC_RELAXED); |
| pthread_join(th, 0); |
| fprintf(stderr, "DONE\n"); |
| return 0; |
| } |
| |
| // CHECK-NOT: WARNING: ThreadSanitizer: |
| // CHECK: DONE |