forked from OSchip/llvm-project
61 lines
1.4 KiB
C++
61 lines
1.4 KiB
C++
// RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
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// Test that a signal is not delivered when it is blocked.
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#include "test.h"
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#include <semaphore.h>
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#include <signal.h>
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#include <errno.h>
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int stop;
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sig_atomic_t signal_blocked;
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void handler(int signum) {
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if (signal_blocked) {
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fprintf(stderr, "signal arrived when blocked\n");
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exit(1);
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}
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}
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void *thread(void *arg) {
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sigset_t myset;
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sigemptyset(&myset);
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sigaddset(&myset, SIGUSR1);
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while (!__atomic_load_n(&stop, __ATOMIC_RELAXED)) {
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usleep(1);
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if (pthread_sigmask(SIG_BLOCK, &myset, 0)) {
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fprintf(stderr, "pthread_sigmask failed %d\n", errno);
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exit(1);
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}
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signal_blocked = 1;
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usleep(1);
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signal_blocked = 0;
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if (pthread_sigmask(SIG_UNBLOCK, &myset, 0)) {
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fprintf(stderr, "pthread_sigmask failed %d\n", errno);
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exit(1);
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}
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}
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return 0;
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}
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int main(int argc, char** argv) {
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struct sigaction act = {};
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act.sa_handler = &handler;
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if (sigaction(SIGUSR1, &act, 0)) {
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fprintf(stderr, "sigaction failed %d\n", errno);
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return 1;
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}
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pthread_t th;
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pthread_create(&th, 0, thread, 0);
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for (int i = 0; i < 100000; i++)
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pthread_kill(th, SIGUSR1);
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__atomic_store_n(&stop, 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: ThreadSanitizer CHECK
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// CHECK-NOT: WARNING: ThreadSanitizer:
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// CHECK: DONE
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