forked from OSchip/llvm-project
50 lines
1.1 KiB
C++
50 lines
1.1 KiB
C++
// RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
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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 <unistd.h>
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#include <errno.h>
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pthread_t mainth;
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volatile int done;
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static void MyHandler(int, siginfo_t *s, void *c) {
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errno = 1;
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done = 1;
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}
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static void* sendsignal(void *p) {
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sleep(1);
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pthread_kill(mainth, SIGPROF);
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return 0;
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}
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static __attribute__((noinline)) void loop() {
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while (done == 0) {
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volatile char *p = (char*)malloc(1);
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p[0] = 0;
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free((void*)p);
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pthread_yield();
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}
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}
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int main() {
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mainth = pthread_self();
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struct sigaction act = {};
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act.sa_sigaction = &MyHandler;
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sigaction(SIGPROF, &act, 0);
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pthread_t th;
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pthread_create(&th, 0, sendsignal, 0);
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loop();
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pthread_join(th, 0);
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return 0;
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}
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// CHECK: WARNING: ThreadSanitizer: signal handler spoils errno
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// CHECK: #0 MyHandler(int, siginfo{{(_t)?}}*, void*) {{.*}}signal_errno.cc
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// CHECK: main
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// CHECK: SUMMARY: ThreadSanitizer: signal handler spoils errno{{.*}}MyHandler
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