272 lines
8.4 KiB
C
272 lines
8.4 KiB
C
/************************************************************************
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* sched/sig_initialize.c
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*
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* Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <stdint.h>
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#include <queue.h>
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#include <nuttx/kmalloc.h>
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#include "os_internal.h"
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#include "signal/signal.h"
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/************************************************************************
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* Definitions
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************************************************************************/
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/************************************************************************
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* Private Type Declarations
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************************************************************************/
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/************************************************************************
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* Global Variables
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************************************************************************/
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/* The g_sigfreeaction data structure is a list of available signal
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* action structures.
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*/
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sq_queue_t g_sigfreeaction;
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/* The g_sigpendingaction data structure is a list of available pending
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* signal action structures.
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*/
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sq_queue_t g_sigpendingaction;
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/* The g_sigpendingirqaction is a list of available pending signal actions
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* that are reserved for use by interrupt handlers.
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*/
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sq_queue_t g_sigpendingirqaction;
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/* The g_sigpendingsignal data structure is a list of available pending
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* signal structures.
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*/
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sq_queue_t g_sigpendingsignal;
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/* The g_sigpendingirqsignal data structure is a list of available
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* pending signal structures that are reserved for use by interrupt
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* handlers.
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*/
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sq_queue_t g_sigpendingirqsignal;
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/************************************************************************
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* Private Variables
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************************************************************************/
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/* g_sigactionalloc is a pointer to the start of the allocated blocks of
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* signal actions.
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*/
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static sigactq_t *g_sigactionalloc;
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/* g_sigpendingactionalloc is a pointer to the start of the allocated
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* blocks of pending signal actions.
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*/
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static sigq_t *g_sigpendingactionalloc;
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/* g_sigpendingirqactionalloc is a pointer to the start of the allocated
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* block of pending signal actions.
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*/
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static sigq_t *g_sigpendingirqactionalloc;
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/* g_sigpendingsignalalloc is a pointer to the start of the allocated
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* blocks of pending signals.
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*/
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static sigpendq_t *g_sigpendingsignalalloc;
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/* g_sigpendingirqsignalalloc is a pointer to the start of the allocated
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* blocks of pending signals.
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*/
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static sigpendq_t *g_sigpendingirqsignalalloc;
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/************************************************************************
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* Private Function Prototypes
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************************************************************************/
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static sigq_t *sig_allocateblock(sq_queue_t *siglist, uint16_t nsigs,
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uint8_t sigtype);
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static sigpendq_t *sig_allocatependingsignalblock(sq_queue_t *siglist,
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uint16_t nsigs, uint8_t sigtype);
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/************************************************************************
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* Private Functions
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************************************************************************/
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/************************************************************************
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* Name: sig_allocateblock
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*
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* Description:
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* Allocate a block of pending signal actions and place them
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* on the free list.
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*
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************************************************************************/
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static sigq_t *sig_allocateblock(sq_queue_t *siglist, uint16_t nsigs,
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uint8_t sigtype)
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{
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sigq_t *sigqalloc;
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sigq_t *sigq;
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int i;
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/* Allocate a block of pending signal actions */
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sigqalloc = (sigq_t*)kmalloc((sizeof(sigq_t)) * nsigs);
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sigq = sigqalloc;
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for (i = 0; i < nsigs; i++)
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{
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sigq->type = sigtype;
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sq_addlast((FAR sq_entry_t*)sigq++, siglist);
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}
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return sigqalloc;
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}
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/************************************************************************
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* Name: sig_allocatependingsignalblock
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*
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* Description:
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* Allocate a block of pending signal structures and place them on
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* the free list.
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*
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************************************************************************/
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static sigpendq_t *sig_allocatependingsignalblock(sq_queue_t *siglist,
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uint16_t nsigs, uint8_t sigtype)
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{
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sigpendq_t *sigpendalloc;
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sigpendq_t *sigpend;
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int i;
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/* Allocate a block of pending signal structures */
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sigpendalloc =
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(sigpendq_t*)kmalloc((sizeof(sigpendq_t)) * nsigs);
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sigpend = sigpendalloc;
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for (i = 0; i < nsigs; i++)
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{
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sigpend->type = sigtype;
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sq_addlast((FAR sq_entry_t*)sigpend++, siglist);
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}
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return sigpendalloc;
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}
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/************************************************************************
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* Public Functions
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************************************************************************/
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/************************************************************************
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* Name: sig_initialize
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*
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* Description:
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* Perform one-time power-up initialization
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*
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************************************************************************/
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void sig_initialize(void)
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{
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/* Initialize free lists */
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sq_init(&g_sigfreeaction);
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sq_init(&g_sigpendingaction);
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sq_init(&g_sigpendingirqaction);
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sq_init(&g_sigpendingsignal);
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sq_init(&g_sigpendingirqsignal);
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/* Add a block of signal structures to each list */
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g_sigpendingactionalloc =
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sig_allocateblock(&g_sigpendingaction,
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NUM_PENDING_ACTIONS,
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SIG_ALLOC_FIXED);
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g_sigpendingirqactionalloc =
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sig_allocateblock(&g_sigpendingirqaction,
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NUM_PENDING_INT_ACTIONS,
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SIG_ALLOC_IRQ);
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sig_allocateactionblock();
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g_sigpendingsignalalloc =
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sig_allocatependingsignalblock(&g_sigpendingsignal,
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NUM_SIGNALS_PENDING,
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SIG_ALLOC_FIXED);
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g_sigpendingirqsignalalloc =
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sig_allocatependingsignalblock(&g_sigpendingirqsignal,
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NUM_INT_SIGNALS_PENDING,
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SIG_ALLOC_IRQ);
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}
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/************************************************************************
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* Name: sig_allocateactionblock
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*
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* Description:
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* Allocate a block of signal actions and place them
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* on the free list.
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*
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************************************************************************/
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void sig_allocateactionblock(void)
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{
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sigactq_t *sigact;
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int i;
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/* Allocate a block of signal actions */
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g_sigactionalloc =
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(sigactq_t*)kmalloc((sizeof(sigactq_t)) * NUM_SIGNAL_ACTIONS);
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sigact = g_sigactionalloc;
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for (i = 0; i < NUM_SIGNAL_ACTIONS; i++)
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{
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sq_addlast((FAR sq_entry_t*)sigact++, &g_sigfreeaction);
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}
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}
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