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incubator-nuttx
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sched/sched/sched_waitpid.c: Discard the correct child entry 

Summary:
 - Discard the correct child entry after receiving SIGCHLD.

Impact:
 - waitpid, wait

Testing:
hifive1-revb:nsh (CONFIG_SCHED_HAVE_PARENT=y, CONFIG_SCHED_CHILD_STATUS=y, CONFIG_SIG_DEFAULT=y)
on QEMU

static int task_main(int argc, char *argv[])
{
  sleep(1);
  return 0;
}

int main(int argc, FAR char *argv[])
{
  pid_t pid1;
  pid_t pid2;
  int status;

  task_create("task1", 224, 1024, task_main, NULL);
  task_create("task2", 224, 1024, task_main, NULL);

  pid1 = waitpid(-1, &status, 0);
  pid2 = waitpid(-1, &status, 0);

  assert(pid1 != pid2);

  return 0;
}
This commit is contained in:
Yoshinori Sugino 2020-12-02 02:26:59 +09:00 committed by Masayuki Ishikawa
parent 3865960b89
commit bd79eaa5a6
1 changed files with 1 additions and 1 deletions
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2
sched/sched/sched_waitpid.c
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@ -442,7 +442,7 @@ pid_t nx_waitpid(pid_t pid, int *stat_loc, int options)
{
/* Recover the exiting child */
child = group_exit_child(rtcb->group);
child = group_find_child(rtcb->group, info.si_pid);
DEBUGASSERT(child != NULL);
/* Discard the child entry, if we have one */