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nuttx/sched/signal/sig_initialize.c

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/************************************************************************
* sched/signal/sig_initialize.c
*
* Copyright (C) 2007, 2009, 2011 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 <stdint.h>
#include <queue.h>
#include <nuttx/kmalloc.h>
#include "signal/signal.h"
/************************************************************************
* Pre-processor Definitions
************************************************************************/
/************************************************************************
* Private Type Declarations
************************************************************************/
/************************************************************************
* Global Variables
************************************************************************/
/* The g_sigfreeaction data structure is a list of available signal
* action structures.
*/
sq_queue_t g_sigfreeaction;
/* The g_sigpendingaction data structure is a list of available pending
* signal action structures.
*/
sq_queue_t g_sigpendingaction;
/* The g_sigpendingirqaction is a list of available pending signal actions
* that are reserved for use by interrupt handlers.
*/
sq_queue_t g_sigpendingirqaction;
/* The g_sigpendingsignal data structure is a list of available pending
* signal structures.
*/
sq_queue_t g_sigpendingsignal;
/* The g_sigpendingirqsignal data structure is a list of available
* pending signal structures that are reserved for use by interrupt
* handlers.
*/
sq_queue_t g_sigpendingirqsignal;
/************************************************************************
* Private Variables
************************************************************************/
/* g_sigactionalloc is a pointer to the start of the allocated blocks of
* signal actions.
*/
static sigactq_t *g_sigactionalloc;
/* g_sigpendingactionalloc is a pointer to the start of the allocated
* blocks of pending signal actions.
*/
static sigq_t *g_sigpendingactionalloc;
/* g_sigpendingirqactionalloc is a pointer to the start of the allocated
* block of pending signal actions.
*/
static sigq_t *g_sigpendingirqactionalloc;
/* g_sigpendingsignalalloc is a pointer to the start of the allocated
* blocks of pending signals.
*/
static sigpendq_t *g_sigpendingsignalalloc;
/* g_sigpendingirqsignalalloc is a pointer to the start of the allocated
* blocks of pending signals.
*/
static sigpendq_t *g_sigpendingirqsignalalloc;
/************************************************************************
* Private Function Prototypes
************************************************************************/
static sigq_t *sig_allocateblock(sq_queue_t *siglist, uint16_t nsigs,
uint8_t sigtype);
static sigpendq_t *sig_allocatependingsignalblock(sq_queue_t *siglist,
uint16_t nsigs, uint8_t sigtype);
/************************************************************************
* Private Functions
************************************************************************/
/************************************************************************
* Name: sig_allocateblock
*
* Description:
* Allocate a block of pending signal actions and place them
* on the free list.
*
************************************************************************/
static sigq_t *sig_allocateblock(sq_queue_t *siglist, uint16_t nsigs,
uint8_t sigtype)
{
sigq_t *sigqalloc;
sigq_t *sigq;
int i;
/* Allocate a block of pending signal actions */
sigqalloc = (sigq_t*)kmm_malloc((sizeof(sigq_t)) * nsigs);
sigq = sigqalloc;
for (i = 0; i < nsigs; i++)
{
sigq->type = sigtype;
sq_addlast((FAR sq_entry_t*)sigq++, siglist);
}
return sigqalloc;
}
/************************************************************************
* Name: sig_allocatependingsignalblock
*
* Description:
* Allocate a block of pending signal structures and place them on
* the free list.
*
************************************************************************/
static sigpendq_t *sig_allocatependingsignalblock(sq_queue_t *siglist,
uint16_t nsigs, uint8_t sigtype)
{
sigpendq_t *sigpendalloc;
sigpendq_t *sigpend;
int i;
/* Allocate a block of pending signal structures */
sigpendalloc =
(sigpendq_t*)kmm_malloc((sizeof(sigpendq_t)) * nsigs);
sigpend = sigpendalloc;
for (i = 0; i < nsigs; i++)
{
sigpend->type = sigtype;
sq_addlast((FAR sq_entry_t*)sigpend++, siglist);
}
return sigpendalloc;
}
/************************************************************************
* Public Functions
************************************************************************/
/************************************************************************
* Name: sig_initialize
*
* Description:
* Perform one-time power-up initialization
*
************************************************************************/
void sig_initialize(void)
{
/* Initialize free lists */
sq_init(&g_sigfreeaction);
sq_init(&g_sigpendingaction);
sq_init(&g_sigpendingirqaction);
sq_init(&g_sigpendingsignal);
sq_init(&g_sigpendingirqsignal);
/* Add a block of signal structures to each list */
g_sigpendingactionalloc =
sig_allocateblock(&g_sigpendingaction,
NUM_PENDING_ACTIONS,
SIG_ALLOC_FIXED);
g_sigpendingirqactionalloc =
sig_allocateblock(&g_sigpendingirqaction,
NUM_PENDING_INT_ACTIONS,
SIG_ALLOC_IRQ);
sig_allocateactionblock();
g_sigpendingsignalalloc =
sig_allocatependingsignalblock(&g_sigpendingsignal,
NUM_SIGNALS_PENDING,
SIG_ALLOC_FIXED);
g_sigpendingirqsignalalloc =
sig_allocatependingsignalblock(&g_sigpendingirqsignal,
NUM_INT_SIGNALS_PENDING,
SIG_ALLOC_IRQ);
}
/************************************************************************
* Name: sig_allocateactionblock
*
* Description:
* Allocate a block of signal actions and place them
* on the free list.
*
************************************************************************/
void sig_allocateactionblock(void)
{
sigactq_t *sigact;
int i;
/* Allocate a block of signal actions */
g_sigactionalloc =
(sigactq_t*)kmm_malloc((sizeof(sigactq_t)) * NUM_SIGNAL_ACTIONS);
sigact = g_sigactionalloc;
for (i = 0; i < NUM_SIGNAL_ACTIONS; i++)
{
sq_addlast((FAR sq_entry_t*)sigact++, &g_sigfreeaction);
}
}
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