forked from OSchip/llvm-project
98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
// RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t > %t.out
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// RUN: FileCheck %s --check-prefixes=CHECK,PARENT --input-file %t.out
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// RUN: FileCheck %s --check-prefixes=CHECK,CHILD --input-file %t.out
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// Regression test for
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// https://groups.google.com/g/thread-sanitizer/c/TQrr4-9PRYo/m/HFR4FMi6AQAJ
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#include "test.h"
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#include <errno.h>
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#include <signal.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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long glob = 0;
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void *worker(void *main) {
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glob++;
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// synchronize with main
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barrier_wait(&barrier);
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// synchronize with atfork
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barrier_wait(&barrier);
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pthread_kill((pthread_t)main, SIGPROF);
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barrier_wait(&barrier);
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// synchronize with afterfork
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barrier_wait(&barrier);
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pthread_kill((pthread_t)main, SIGPROF);
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barrier_wait(&barrier);
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return NULL;
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}
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void atfork() {
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barrier_wait(&barrier);
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barrier_wait(&barrier);
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write(2, "in atfork\n", strlen("in atfork\n"));
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static volatile long a;
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__atomic_fetch_add(&a, 1, __ATOMIC_RELEASE);
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}
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void afterfork() {
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barrier_wait(&barrier);
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barrier_wait(&barrier);
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write(2, "in afterfork\n", strlen("in afterfork\n"));
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static volatile long a;
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__atomic_fetch_add(&a, 1, __ATOMIC_RELEASE);
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}
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void afterfork_child() {
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write(2, "in afterfork_child\n", strlen("in afterfork_child\n"));
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glob++;
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}
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void handler(int sig) {
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write(2, "in handler\n", strlen("in handler\n"));
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glob++;
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}
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int main() {
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barrier_init(&barrier, 2);
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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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pthread_atfork(atfork, afterfork, afterfork_child);
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pthread_t t;
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pthread_create(&t, NULL, worker, (void *)pthread_self());
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barrier_wait(&barrier);
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pid_t pid = fork();
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if (pid < 0) {
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fprintf(stderr, "fork failed: %d\n", errno);
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return 1;
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}
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if (pid == 0) {
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fprintf(stderr, "CHILD\n");
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return 0;
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}
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if (pid != waitpid(pid, NULL, 0)) {
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fprintf(stderr, "waitpid failed: %d\n", errno);
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return 1;
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}
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pthread_join(t, NULL);
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fprintf(stderr, "PARENT\n");
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return 0;
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}
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// CHECK: in atfork
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// CHECK: in handler
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// CHECK: ThreadSanitizer: data race
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// CHECK: Write of size 8
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// CHECK: #0 handler
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// CHECK: Previous write of size 8
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// CHECK: #0 worker
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// PARENT: afterfork
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// PARENT: in handler
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// CHILD: afterfork_child
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// CHILD: CHILD
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// CHECK: PARENT
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