1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s 2 // UNSUPPORTED: darwin 3 #include <pthread.h> 4 #include <stdio.h> 5 #include <stdlib.h> 6 #include <signal.h> 7 #include <sys/types.h> 8 #include <sys/time.h> 9 #include <unistd.h> 10 #include <errno.h> 11 12 // Test synchronization in signal handled within IgnoreSync region. 13 14 extern "C" void AnnotateIgnoreSyncBegin(const char *f, int l); 15 extern "C" void AnnotateIgnoreSyncEnd(const char *f, int l); 16 17 const int kSignalCount = 500; 18 19 __thread int process_signals; 20 int signals_handled; 21 int done; 22 int ready[kSignalCount]; 23 long long data[kSignalCount]; 24 25 static void handler(int sig) { 26 if (!__atomic_load_n(&process_signals, __ATOMIC_RELAXED)) 27 return; 28 int pos = signals_handled++; 29 if (pos >= kSignalCount) 30 return; 31 data[pos] = pos; 32 __atomic_store_n(&ready[pos], 1, __ATOMIC_RELEASE); 33 } 34 35 static void* thr(void *p) { 36 AnnotateIgnoreSyncBegin(__FILE__, __LINE__); 37 __atomic_store_n(&process_signals, 1, __ATOMIC_RELAXED); 38 while (!__atomic_load_n(&done, __ATOMIC_RELAXED)) { 39 } 40 AnnotateIgnoreSyncEnd(__FILE__, __LINE__); 41 return 0; 42 } 43 44 int main() { 45 struct sigaction act = {}; 46 act.sa_handler = handler; 47 if (sigaction(SIGPROF, &act, 0)) { 48 perror("sigaction"); 49 exit(1); 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; 61 pthread_create(&th, 0, thr, 0); 62 for (int pos = 0; pos < kSignalCount; pos++) { 63 while (__atomic_load_n(&ready[pos], __ATOMIC_ACQUIRE) == 0) { 64 } 65 if (data[pos] != pos) { 66 printf("at pos %d, expect %d, got %lld\n", pos, pos, data[pos]); 67 exit(1); 68 } 69 } 70 __atomic_store_n(&done, 1, __ATOMIC_RELAXED); 71 pthread_join(th, 0); 72 fprintf(stderr, "DONE\n"); 73 return 0; 74 } 75 76 // CHECK-NOT: WARNING: ThreadSanitizer: 77 // CHECK: DONE 78
