forked from OSchip/llvm-project
50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
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// RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
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// Regression test for
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// https://groups.google.com/d/msg/thread-sanitizer/e_zB9gYqFHM/DmAiTsrLAwAJ
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// pthread_atfork() callback triggers a data race and we deadlocked
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// on the report_mtx as we lock it around fork.
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#include "test.h"
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <errno.h>
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int glob = 0;
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void *worker(void *unused) {
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glob++;
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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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glob++;
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}
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int main() {
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barrier_init(&barrier, 2);
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pthread_atfork(atfork, NULL, NULL);
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pthread_t t;
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pthread_create(&t, NULL, worker, NULL);
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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-NOT: ThreadSanitizer: data race
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// CHECK: CHILD
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// CHECK: PARENT
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