/************************************************************************ * sched/signal/sig_initialize.c * * Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #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); } }