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128 lines
4.6 KiB
128 lines
4.6 KiB
/**************************************************************************** |
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* sched/sig_mqnotempty.c |
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* |
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* Copyright (C) 2007-2009 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 <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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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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sdbg("TCB=%p signo=%d value=%d\n", stcb, signo, value.sival_int); |
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#else |
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sdbg("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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