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:
--- 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, XNBREAK))
+ err = -EINTR;
+ }
unlock_and_exit:
--
Philippe.
_______________________________________________
Xenomai-help mailing list
[email protected]
https://mail.gna.org/listinfo/xenomai-help
