54 lines · cpp
1// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s2// UNSUPPORTED: ios3 4#include <pthread.h>5#include <stdio.h>6#include <stdlib.h>7#include <unistd.h>8#include <sys/types.h>9 10int fds[2];11int X;12 13void *Thread1(void *x) {14 X = 42;15 write(fds[1], "a", 1);16 return NULL;17}18 19void *Thread2(void *x) {20 char buf;21 while (read(fds[0], &buf, 1) != 1) {22 }23 X = 43;24 return NULL;25}26 27int main() {28 pipe(fds);29 int pid = vfork();30 if (pid < 0) {31 fprintf(stderr, "FAIL to vfork\n");32 exit(1);33 }34 if (pid == 0) { // child35 // Closing of fds must not affect parent process.36 // Strictly saying this is undefined behavior, because vfork child is not37 // allowed to call any functions other than exec/exit. But this is what38 // openjdk does.39 close(fds[0]);40 close(fds[1]);41 _exit(0);42 }43 pthread_t t[2];44 pthread_create(&t[0], NULL, Thread1, NULL);45 pthread_create(&t[1], NULL, Thread2, NULL);46 pthread_join(t[0], NULL);47 pthread_join(t[1], NULL);48 fprintf(stderr, "DONE\n");49}50 51// CHECK-NOT: WARNING: ThreadSanitizer: data race52// CHECK-NOT: FAIL to vfork53// CHECK: DONE54