92 lines
3.5 KiB
C
92 lines
3.5 KiB
C
/****************************************************************************
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* libs/libnx/nxmu/nx_eventnotify.c
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*
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* Copyright (C) 2008-2009, 2011, 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdlib.h>
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#include <mqueue.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/nx/nx.h>
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#include <nuttx/nx/nxmu.h>
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#ifndef CONFIG_DISABLE_SIGNALS
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nx_eventnotify
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*
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* Description:
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* Rather than calling nx_eventhandler periodically, the client may
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* register to receive a signal when a server event is available. The
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* client can then call nv_eventhandler() only when incoming events are
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* available.
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*
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* Only one such event is issued. Upon receipt of the signal, if the client
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* wishes further notifications, it must call nx_eventnotify again.
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*
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* Input Parameters:
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* handle - the handle returned by nx_connect
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*
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* Returned Value:
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* OK: No errors occurred. If CONFIG_NX_BLOCKING is defined, then
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* one or more server message was processed.
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* ERROR: An error occurred and errno has been set appropriately
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*
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****************************************************************************/
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int nx_eventnotify(NXHANDLE handle, int signo)
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{
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FAR struct nxfe_conn_s *conn = (FAR struct nxfe_conn_s *)handle;
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struct sigevent se;
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se.sigev_notify = SIGEV_SIGNAL;
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se.sigev_signo = signo;
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se.sigev_value.sival_ptr = (FAR void *)handle;
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return mq_notify(conn->crdmq, &se);
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}
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#endif /* CONFIG_DISABLE_SIGNALS */
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