101 lines
3.0 KiB
C
101 lines
3.0 KiB
C
/****************************************************************************
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* sched/signal/sig_allocpendingsigaction.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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/irq.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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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxsig_alloc_pendingsigaction
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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 *nxsig_alloc_pendingsigaction(void)
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{
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FAR sigq_t *sigq;
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irqstate_t flags;
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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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*/
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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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flags = enter_critical_section();
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sigq = (FAR sigq_t *)sq_remfirst(&g_sigpendingaction);
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leave_critical_section(flags);
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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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sigq = (FAR sigq_t *)kmm_malloc((sizeof (sigq_t)));
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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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