[rtems-docs commit] posix-users/message_passing.rst: Add status for cannot block in ISR

[Joel Sherrill]

Module:    rtems-docs
Branch:    master
Commit:    565df3126357f05c46a689f12fbc1bd8fe60abf2
Changeset: http://git.rtems.org/rtems-docs/commit/?id=565df3126357f05c46a689f12fbc1bd8fe60abf2

Author:    Joel Sherrill <joel at rtems.org>
Date:      Fri Jan 24 07:59:38 2020 -0600

posix-users/message_passing.rst: Add status for cannot block in ISR

Updates #3857.

---

 posix-users/message_passing.rst | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/posix-users/message_passing.rst b/posix-users/message_passing.rst
index 50c43dd..c003967 100644
--- a/posix-users/message_passing.rst
+++ b/posix-users/message_passing.rst
@@ -550,6 +550,8 @@ mq_receive - Receive a Message from a Message Queue
    - The msg_len is less than the ``mq_msgsize`` attribute of the message queue
  * - ``EAGAIN``
    - The message queue is non-blocking, and the queue is empty
+ * - ``EAGAIN``
+   - The operation would block but has been called from an ISR
  * - ``EINTR``
    - The message queue is blocking. While the process was waiting for a message
      to arrive on the queue, a signal arrived that interrupted the wait.