SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
brief: |
  Gets the number of messages pending on the queue.
copyrights:
- Copyright (C) 2021 embedded brains GmbH & Co. KG
- Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR)
definition:
  default:
    attributes: null
    body: null
    params:
    - ${../../type/if/id:/name} ${.:/params[0]/name}
    - ${/c/if/uint32_t:/name} *${.:/params[1]/name}
    return: ${../../status/if/code:/name}
  variants: []
description: |
  This directive returns the number of messages pending on the queue specified
  by ${.:/params[0]/name} in ${.:/params[1]/name}.  If no messages are present
  on the queue, count is set to zero.
enabled-by: true
index-entries:
- get number of pending messages
interface-type: function
links:
- role: interface-placement
  uid: header
- role: interface-ingroup
  uid: group
- role: constraint
  uid: /constraint/directive-ctx-task
- role: constraint
  uid: /constraint/directive-ctx-isr
- role: constraint
  uid: /constraint/directive-remote
name: rtems_message_queue_get_number_pending
notes: null
params:
- description: |
    is the queue identifier.
  dir: null
  name: id
- description: |
    is the pointer to an ${/c/if/uint32_t:/name} object.  When the directive
    call is successful, the number of pending messages will be stored in this
    object.
  dir: out
  name: count
return:
  return: null
  return-values:
  - description: |
      The requested operation was successful.
    value: ${../../status/if/successful:/name}
  - description: |
      There was no queue associated with the identifier specified by
      ${.:/params[0]/name}.
    value: ${../../status/if/invalid-id:/name}
  - description: |
      The ${.:/params[1]/name} parameter was ${/c/if/null:/name}.
    value: ${../../status/if/invalid-address:/name}
type: interface