| // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s |
| // UNSUPPORTED: ios |
| |
| #include <pthread.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <sys/types.h> |
| |
| int fds[2]; |
| int X; |
| |
| void *Thread1(void *x) { |
| X = 42; |
| write(fds[1], "a", 1); |
| return NULL; |
| } |
| |
| void *Thread2(void *x) { |
| char buf; |
| while (read(fds[0], &buf, 1) != 1) { |
| } |
| X = 43; |
| return NULL; |
| } |
| |
| int main() { |
| pipe(fds); |
| int pid = vfork(); |
| if (pid < 0) { |
| fprintf(stderr, "FAIL to vfork\n"); |
| exit(1); |
| } |
| if (pid == 0) { // child |
| // Closing of fds must not affect parent process. |
| // Strictly saying this is undefined behavior, because vfork child is not |
| // allowed to call any functions other than exec/exit. But this is what |
| // openjdk does. |
| close(fds[0]); |
| close(fds[1]); |
| _exit(0); |
| } |
| pthread_t t[2]; |
| pthread_create(&t[0], NULL, Thread1, NULL); |
| pthread_create(&t[1], NULL, Thread2, NULL); |
| pthread_join(t[0], NULL); |
| pthread_join(t[1], NULL); |
| fprintf(stderr, "DONE\n"); |
| } |
| |
| // CHECK-NOT: WARNING: ThreadSanitizer: data race |
| // CHECK-NOT: FAIL to vfork |
| // CHECK: DONE |