1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s 2 // UNSUPPORTED: darwin 3 // Fails episodically on powerpc bots: 4 // https://lab.llvm.org/buildbot/#/builders/121/builds/13391 5 // UNSUPPORTED: powerpc64, powerpc64le 6 #include "test.h" 7 #include <errno.h> 8 #include <signal.h> 9 #include <sys/time.h> 10 #include <sys/types.h> 11 12 // Test synchronization in signal handled within IgnoreSync region. 13 14 const int kSignalCount = 500; 15 16 __thread int process_signals; 17 int signals_handled; 18 int done; 19 int ready[kSignalCount]; 20 long long data[kSignalCount]; 21 22 static void handler(int sig) { 23 if (!__atomic_load_n(&process_signals, __ATOMIC_RELAXED)) 24 return; 25 int pos = signals_handled++; 26 if (pos >= kSignalCount) 27 return; 28 data[pos] = pos; 29 __atomic_store_n(&ready[pos], 1, __ATOMIC_RELEASE); 30 } 31 32 static void* thr(void *p) { 33 AnnotateIgnoreSyncBegin(__FILE__, __LINE__); 34 __atomic_store_n(&process_signals, 1, __ATOMIC_RELAXED); 35 while (!__atomic_load_n(&done, __ATOMIC_RELAXED)) { 36 } 37 AnnotateIgnoreSyncEnd(__FILE__, __LINE__); 38 return 0; 39 } 40 41 int main() { 42 struct sigaction act = {}; 43 act.sa_handler = handler; 44 if (sigaction(SIGPROF, &act, 0)) { 45 perror("sigaction"); 46 exit(1); 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; 58 pthread_create(&th, 0, thr, 0); 59 for (int pos = 0; pos < kSignalCount; pos++) { 60 while (__atomic_load_n(&ready[pos], __ATOMIC_ACQUIRE) == 0) { 61 } 62 if (data[pos] != pos) { 63 printf("at pos %d, expect %d, got %lld\n", pos, pos, data[pos]); 64 exit(1); 65 } 66 } 67 __atomic_store_n(&done, 1, __ATOMIC_RELAXED); 68 pthread_join(th, 0); 69 fprintf(stderr, "DONE\n"); 70 return 0; 71 } 72 73 // CHECK-NOT: WARNING: ThreadSanitizer: 74 // CHECK: DONE 75