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      1 // RUN: %clangxx_tsan -O1 %s -o %t && %env_tsan_opts=atexit_sleep_ms=50 %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 #include <sys/wait.h>
      8 
      9 void foo() {
     10   printf("CHILD ATEXIT\n");
     11 }
     12 
     13 void *worker(void *unused) {
     14   return 0;
     15 }
     16 
     17 int main() {
     18   pthread_t t;
     19   pthread_create(&t, NULL, worker, NULL);
     20   int pid = fork();
     21   if (pid == 0) {
     22     // child
     23     atexit(foo);
     24     fprintf(stderr, "CHILD DONE\n");
     25   } else {
     26     pthread_join(t, 0);
     27     if (waitpid(pid, 0, 0) == -1) {
     28       perror("waitpid");
     29       exit(1);
     30     }
     31     fprintf(stderr, "PARENT DONE\n");
     32   }
     33 }
     34 
     35 // CHECK: CHILD DONE
     36 // CHECK: CHILD ATEXIT
     37 // CHECK: PARENT DONE
     38