1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s 2 #include <pthread.h> 3 #include <stdio.h> 4 #include <stdlib.h> 5 #include <unistd.h> 6 #include <sys/types.h> 7 8 int fds[2]; 9 int X; 10 11 void *Thread1(void *x) { 12 X = 42; 13 write(fds[1], "a", 1); 14 return NULL; 15 } 16 17 void *Thread2(void *x) { 18 char buf; 19 while (read(fds[0], &buf, 1) != 1) { 20 } 21 X = 43; 22 return NULL; 23 } 24 25 int main() { 26 pipe(fds); 27 int pid = vfork(); 28 if (pid < 0) { 29 fprintf(stderr, "FAIL to vfork\n"); 30 exit(1); 31 } 32 if (pid == 0) { // child 33 // Closing of fds must not affect parent process. 34 // Strictly saying this is undefined behavior, because vfork child is not 35 // allowed to call any functions other than exec/exit. But this is what 36 // openjdk does. 37 close(fds[0]); 38 close(fds[1]); 39 _exit(0); 40 } 41 pthread_t t[2]; 42 pthread_create(&t[0], NULL, Thread1, NULL); 43 pthread_create(&t[1], NULL, Thread2, NULL); 44 pthread_join(t[0], NULL); 45 pthread_join(t[1], NULL); 46 fprintf(stderr, "DONE\n"); 47 } 48 49 // CHECK-NOT: WARNING: ThreadSanitizer: data race 50 // CHECK-NOT: FAIL to vfork 51 // CHECK: DONE 52
