133 lines
4.7 KiB
C
133 lines
4.7 KiB
C
/****************************************************************************
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* sched/sig_mqnotempty.c
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*
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* Copyright (C) 2007-2009, 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 <nuttx/compiler.h>
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#include <signal.h>
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#include <sched.h>
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#include <errno.h>
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#include <debug.h>
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#include "os_internal.h"
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#include "sig_internal.h"
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/****************************************************************************
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* Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Type Declarations
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****************************************************************************/
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/****************************************************************************
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* Global Variables
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****************************************************************************/
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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/****************************************************************************
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* Private Functionss
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sig_mqnotempty
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*
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* Description:
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* This function is equivalent to sigqueue(), but supports the messaging
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* system's requirement to signal a task when a message queue becomes
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* non-empty. It is identical to sigqueue(), except that it sets the
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* si_code field in the siginfo structure to SI_MESGQ rather than SI_QUEUE.
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*
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****************************************************************************/
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#ifdef CONFIG_CAN_PASS_STRUCTS
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int sig_mqnotempty(int pid, int signo, union sigval value)
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#else
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int sig_mqnotempty(int pid, int signo, void *sival_ptr)
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#endif
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{
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#ifdef CONFIG_SCHED_HAVE_PARENT
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FAR struct tcb_s *rtcb = (FAR struct tcb_s *)g_readytorun.head;
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#endif
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siginfo_t info;
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int ret;
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#ifdef CONFIG_CAN_PASS_STRUCTS
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sdbg("pid=%p signo=%d value=%d\n", pid, signo, value.sival_int);
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#else
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sdbg("pid=%p signo=%d sival_ptr=%p\n", pid, signo, sival_ptr);
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#endif
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/* Verify that we can perform the signalling operation */
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if (!GOOD_SIGNO(signo))
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{
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return -EINVAL;
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}
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/* Create the siginfo structure */
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info.si_signo = signo;
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info.si_code = SI_MESGQ;
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#ifdef CONFIG_CAN_PASS_STRUCTS
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info.si_value = value;
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#else
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info.si_value.sival_ptr = sival_ptr;
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#endif
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#ifdef CONFIG_SCHED_HAVE_PARENT
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info.si_pid = rtcb->pid;
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info.si_status = OK;
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#endif
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/* Process the receipt of the signal */
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sched_lock();
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ret = sig_dispatch(pid, &info);
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sched_unlock();
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return ret;
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}
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