137 lines
4.6 KiB
C
137 lines
4.6 KiB
C
/************************************************************************
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* sched/signal/sig_allocatependingsigaction.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 <signal.h>
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#include <assert.h>
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#include <nuttx/arch.h>
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#include "signal/signal.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 Function Prototypes
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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_allocatependingsigaction
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*
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* Description:
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* Allocate a new element for the pending signal action queue
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*
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************************************************************************/
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FAR sigq_t *sig_allocatependingsigaction(void)
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{
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FAR sigq_t *sigq;
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irqstate_t saved_state;
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/* Check if we were called from an interrupt handler. */
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if (up_interrupt_context())
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{
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/* Try to get the pending signal action structure from the free list */
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sigq = (FAR sigq_t*)sq_remfirst(&g_sigpendingaction);
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/* If so, then try the special list of structures reserved for
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* interrupt handlers
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*/
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if (!sigq)
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{
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sigq = (FAR sigq_t*)sq_remfirst(&g_sigpendingirqaction);
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}
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}
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/* If we were not called from an interrupt handler, then we are
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* free to allocate pending signal action structures if necessary. */
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else
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{
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/* Try to get the pending signal action structure from the free list */
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saved_state = irqsave();
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sigq = (FAR sigq_t*)sq_remfirst(&g_sigpendingaction);
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irqrestore(saved_state);
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/* Check if we got one. */
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if (!sigq)
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{
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/* No...Try the resource pool */
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if (!sigq)
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{
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sigq = (FAR sigq_t *)kmm_malloc((sizeof (sigq_t)));
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}
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/* Check if we got an allocated message */
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if (sigq)
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{
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sigq->type = SIG_ALLOC_DYN;
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}
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}
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}
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return sigq;
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}
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