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a0efb1fefe
The kmm_alloc can break the critical section, if it sleeps on the heap mutex. If we run out of pending signal structures, allocate more right after entering the critical section but before checking if the signal needs to be added to the pending queue. Signed-off-by: Jukka Laitinen <jukka.laitinen@tii.ae>
86 lines
2.7 KiB
C
86 lines
2.7 KiB
C
/****************************************************************************
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* sched/signal/sig_allocpendingsigaction.c
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*
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* SPDX-License-Identifier: Apache-2.0
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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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}
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return sigq;
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}
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