forked from Archive/PX4-Autopilot
138 lines
4.6 KiB
C
138 lines
4.6 KiB
C
/************************************************************************
|
|
* 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;
|
|
}
|
|
|