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Diffstat (limited to 'nuttx/sched/sig_allocatependingsigaction.c')
-rw-r--r-- | nuttx/sched/sig_allocatependingsigaction.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/nuttx/sched/sig_allocatependingsigaction.c b/nuttx/sched/sig_allocatependingsigaction.c new file mode 100644 index 000000000..15d6470ca --- /dev/null +++ b/nuttx/sched/sig_allocatependingsigaction.c @@ -0,0 +1,137 @@ +/************************************************************************ + * sched/sig_allocatependingsigaction.c + * + * Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ************************************************************************/ + +/************************************************************************ + * Included Files + ************************************************************************/ + +#include <nuttx/config.h> + +#include <signal.h> +#include <assert.h> +#include <nuttx/arch.h> + +#include "os_internal.h" +#include "sig_internal.h" + +/************************************************************************ + * Definitions + ************************************************************************/ + +/************************************************************************ + * Private Type Declarations + ************************************************************************/ + +/************************************************************************ + * Global Variables + ************************************************************************/ + +/************************************************************************ + * Private Variables + ************************************************************************/ + +/************************************************************************ + * Private Function Prototypes + ************************************************************************/ + +/************************************************************************ + * Public Functions + ************************************************************************/ + +/************************************************************************ + * Name: sig_allocatependingsigaction + * + * Description: + * Allocate a new element for the pending signal action queue + * + ************************************************************************/ + +FAR sigq_t *sig_allocatependingsigaction(void) +{ + FAR sigq_t *sigq; + irqstate_t saved_state; + + /* Check if we were called from an interrupt handler. */ + + if (up_interrupt_context()) + { + /* Try to get the pending signal action structure from the free list */ + + sigq = (FAR sigq_t*)sq_remfirst(&g_sigpendingaction); + + /* If so, then try the special list of structures reserved for + * interrupt handlers + */ + + if (!sigq) + { + sigq = (FAR sigq_t*)sq_remfirst(&g_sigpendingirqaction); + } + } + + /* If we were not called from an interrupt handler, then we are + * free to allocate pending signal action structures if necessary. */ + + else + { + /* Try to get the pending signal action structure from the free list */ + + saved_state = irqsave(); + sigq = (FAR sigq_t*)sq_remfirst(&g_sigpendingaction); + irqrestore(saved_state); + + /* Check if we got one. */ + + if (!sigq) + { + /* No...Try the resource pool */ + + if (!sigq) + { + sigq = (FAR sigq_t *)kmalloc((sizeof (sigq_t))); + } + + /* Check if we got an allocated message */ + + if (sigq) + { + sigq->type = SIG_ALLOC_DYN; + } + } + } + + return sigq; +} + |