75 lines · cpp
1// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s2// UNSUPPORTED: darwin3// Fails episodically on powerpc bots:4// https://lab.llvm.org/buildbot/#/builders/121/builds/133915// UNSUPPORTED: target=powerpc64{{.*}}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 14const int kSignalCount = 500;15 16__thread int process_signals;17int signals_handled;18int done;19int ready[kSignalCount];20long long data[kSignalCount];21 22static 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 32static 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 41int 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: DONE75