1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
2
3 // The test tries to provoke internal allocator to be locked during fork
4 // and then force the child process to use the internal allocator.
5
6 #include "../test.h"
7 #include <errno.h>
8 #include <sys/types.h>
9 #include <sys/wait.h>
10
forker(void * arg)11 static void *forker(void *arg) {
12 void *p = calloc(1, 16);
13 static_cast<volatile int *>(p)[0]++;
14 __atomic_fetch_add(static_cast<int *>(p), 1, __ATOMIC_SEQ_CST);
15 int pid = fork();
16 if (pid < 0) {
17 fprintf(stderr, "failed to fork (%d)\n", errno);
18 exit(1);
19 }
20 if (pid == 0) {
21 __atomic_fetch_add(&static_cast<int *>(p)[1], 1, __ATOMIC_SEQ_CST);
22 exit(0);
23 }
24 int status = 0;
25 while (waitpid(pid, &status, 0) != pid) {
26 }
27 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
28 fprintf(stderr, "subprocess failed (%d)\n", status);
29 exit(1);
30 }
31 free(p);
32 return 0;
33 }
34
main()35 int main() {
36 for (int i = 0; i < 10; i++) {
37 pthread_t threads[100];
38 for (auto &th : threads)
39 pthread_create(&th, 0, forker, 0);
40 for (auto th : threads)
41 pthread_join(th, 0);
42 }
43 fprintf(stderr, "DONE\n");
44 }
45
46 // CHECK: DONE
47