forked from OSchip/llvm-project
78 lines
1.8 KiB
C++
78 lines
1.8 KiB
C++
// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
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// UNSUPPORTED: darwin
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <errno.h>
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// Test synchronization in signal handled within IgnoreSync region.
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extern "C" void AnnotateIgnoreSyncBegin(const char *f, int l);
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extern "C" void AnnotateIgnoreSyncEnd(const char *f, int l);
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const int kSignalCount = 500;
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__thread int process_signals;
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int signals_handled;
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int done;
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int ready[kSignalCount];
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long long data[kSignalCount];
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static void handler(int sig) {
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if (!__atomic_load_n(&process_signals, __ATOMIC_RELAXED))
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return;
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int pos = signals_handled++;
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if (pos >= kSignalCount)
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return;
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data[pos] = pos;
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__atomic_store_n(&ready[pos], 1, __ATOMIC_RELEASE);
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}
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static void* thr(void *p) {
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AnnotateIgnoreSyncBegin(__FILE__, __LINE__);
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__atomic_store_n(&process_signals, 1, __ATOMIC_RELAXED);
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while (!__atomic_load_n(&done, __ATOMIC_RELAXED)) {
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}
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AnnotateIgnoreSyncEnd(__FILE__, __LINE__);
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return 0;
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}
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int main() {
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struct sigaction act = {};
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act.sa_handler = handler;
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if (sigaction(SIGPROF, &act, 0)) {
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perror("sigaction");
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exit(1);
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}
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itimerval t;
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t.it_value.tv_sec = 0;
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t.it_value.tv_usec = 10;
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t.it_interval = t.it_value;
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if (setitimer(ITIMER_PROF, &t, 0)) {
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perror("setitimer");
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exit(1);
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}
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pthread_t th;
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pthread_create(&th, 0, thr, 0);
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for (int pos = 0; pos < kSignalCount; pos++) {
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while (__atomic_load_n(&ready[pos], __ATOMIC_ACQUIRE) == 0) {
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}
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if (data[pos] != pos) {
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printf("at pos %d, expect %d, got %lld\n", pos, pos, data[pos]);
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exit(1);
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}
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}
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__atomic_store_n(&done, 1, __ATOMIC_RELAXED);
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pthread_join(th, 0);
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fprintf(stderr, "DONE\n");
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return 0;
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}
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// CHECK-NOT: WARNING: ThreadSanitizer:
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// CHECK: DONE
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