nuttx/sched/signal/sig_mqnotempty.c

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/****************************************************************************
* sched/signal/sig_mqnotempty.c
*
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* Copyright (C) 2007-2009, 2013, 2015 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/compiler.h>
#include <signal.h>
#include <sched.h>
#include <errno.h>
#include <debug.h>
#include "sched/sched.h"
#include "signal/signal.h"
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: sig_mqnotempty
*
* Description:
* This function is equivalent to sigqueue(), but supports the messaging
* system's requirement to signal a task when a message queue becomes
* non-empty. It is identical to sigqueue(), except that it sets the
* si_code field in the siginfo structure to SI_MESGQ rather than SI_QUEUE.
*
****************************************************************************/
#ifdef CONFIG_CAN_PASS_STRUCTS
int sig_mqnotempty(int pid, int signo, union sigval value)
#else
int sig_mqnotempty(int pid, int signo, void *sival_ptr)
#endif
{
#ifdef CONFIG_SCHED_HAVE_PARENT
FAR struct tcb_s *rtcb = this_task();
#endif
siginfo_t info;
int ret;
#ifdef CONFIG_CAN_PASS_STRUCTS
sdbg("pid=%p signo=%d value=%d\n", pid, signo, value.sival_int);
#else
sdbg("pid=%p signo=%d sival_ptr=%p\n", pid, signo, sival_ptr);
#endif
/* Verify that we can perform the signalling operation */
if (!GOOD_SIGNO(signo))
{
return -EINVAL;
}
/* Create the siginfo structure */
info.si_signo = signo;
info.si_code = SI_MESGQ;
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info.si_errno = OK;
#ifdef CONFIG_CAN_PASS_STRUCTS
info.si_value = value;
#else
info.si_value.sival_ptr = sival_ptr;
#endif
#ifdef CONFIG_SCHED_HAVE_PARENT
info.si_pid = rtcb->pid;
info.si_status = OK;
#endif
/* Process the receipt of the signal */
sched_lock();
ret = sig_dispatch(pid, &info);
sched_unlock();
return ret;
}