a60059d9d0
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@20 42af7a65-404d-4744-a932-0658087f49c3
127 lines
4.3 KiB
C
127 lines
4.3 KiB
C
/************************************************************
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* sig_mqnotempty.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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 Gregory Nutt 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/compiler.h>
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#include <sys/types.h>
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#include <signal.h>
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#include <sched.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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* Function: sig_mqnotempty
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*
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* Description:
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* This function is equivalent to sigqueue(), but supports
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* the messaging system's requirement to signal a task when
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* a message queue becomes non-empty. It is identical to
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* sigqueue(), except that it sets the si_code field in
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* 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, const 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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FAR _TCB *stcb;
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siginfo_t info;
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int ret = ERROR;
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sched_lock();
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/* Get the TCB of the receiving task */
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stcb = sched_gettcb(pid);
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#ifdef CONFIG_CAN_PASS_STRUCTS
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dbg("TCB=%p signo=%d value=%d\n", stcb, signo, value.sival_int);
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#else
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dbg("TCB=%p signo=%d sival_ptr=%p\n", stcb, signo, sival_ptr);
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#endif
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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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/* Verify that we can perform the signalling operation */
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if ((stcb) && (GOOD_SIGNO(signo)))
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{
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/* Process the receipt of the signal */
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ret = sig_received(stcb, &info);
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}
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sched_unlock();
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return ret;
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}
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