File: fork_deadlock.cpp

package info (click to toggle)
swiftlang 6.0.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 2,519,992 kB
  • sloc: cpp: 9,107,863; ansic: 2,040,022; asm: 1,135,751; python: 296,500; objc: 82,456; f90: 60,502; lisp: 34,951; pascal: 19,946; sh: 18,133; perl: 7,482; ml: 4,937; javascript: 4,117; makefile: 3,840; awk: 3,535; xml: 914; fortran: 619; cs: 573; ruby: 573
file content (38 lines) | stat: -rw-r--r-- 787 bytes parent folder | download | duplicates (38) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
 
// RUN: %clangxx_tsan -O1 %s -o %t && %env_tsan_opts=atexit_sleep_ms=50 %run %t 2>&1 | FileCheck %s
#include "test.h"
#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>

int counter;

static void *incrementer(void *p) {
  for (;;)
    __sync_fetch_and_add(&counter, 1);
  return 0;
}

int main() {
  barrier_init(&barrier, 2);
  pthread_t th1;
  pthread_create(&th1, 0, incrementer, 0);
  for (int i = 0; i < 10; i++) {
    switch (fork()) {
    default:  // parent
      while (wait(0) < 0) {}
      fprintf(stderr, ".");
      break;
    case 0:  // child
      __sync_fetch_and_add(&counter, 1);
      exit(0);
      break;
    case -1:  // error
      fprintf(stderr, "failed to fork (%d)\n", errno);
      exit(1);
    }
  }
  fprintf(stderr, "OK\n");
}

// CHECK: OK