Philippe Gerum wrote:
> Tomas Kalibera wrote:
>> Hi,
>>
>> what can, besides an explicit call, resume a suspended task ? I created
>> and started a child task, then shadowed the current thread with T_SUSP
>> flag. The child was supposed to call rt_task_resume to wake-up the
>> parent and let it terminate the process, but, the parent was resumed
>> before this call. The call to rt_task_suspend in parent returned 0. The
>> program uses SIGALRM signal. Could this be the cause ?
>>
>
> Yes, but the syscall should be silently restarted by default. This patch
> should
> fix the issue:
>
This one will compile:
--- ksrc/skins/native/task.c (revision 3698)
+++ ksrc/skins/native/task.c (working copy)
@@ -410,11 +410,17 @@
* A nesting count is maintained so that rt_task_suspend() and
* rt_task_resume() must be used in pairs.
*
+ * Receiving a Linux signal causes the suspended task to resume
+ * immediately.
+ *
* @param task The descriptor address of the affected task. If @a task
* is NULL, the current task is suspended.
*
* @return 0 is returned upon success. Otherwise:
*
+ * - -EINTR is returned if a Linux signal has been received by the
+ * suspended task.
+ *
* - -EINVAL is returned if @a task is not a task descriptor.
*
* - -EPERM is returned if the addressed @a task is not allowed to sleep
@@ -463,9 +469,12 @@
goto unlock_and_exit;
}
- if (task->suspend_depth++ == 0)
+ if (task->suspend_depth++ == 0) {
xnpod_suspend_thread(&task->thread_base, XNSUSP,
XN_INFINITE, XN_RELATIVE, NULL);
+ if (xnthread_test_info(&task->thread_base, XNBREAK))
+ err = -EINTR;
+ }
unlock_and_exit:
--
Philippe.
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