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Diffstat (limited to 'nuttx/sched/sig_initialize.c')
-rw-r--r-- | nuttx/sched/sig_initialize.c | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/nuttx/sched/sig_initialize.c b/nuttx/sched/sig_initialize.c new file mode 100644 index 000000000..966d818a1 --- /dev/null +++ b/nuttx/sched/sig_initialize.c @@ -0,0 +1,271 @@ +/************************************************************************ + * sched/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 "os_internal.h" +#include "sig_internal.h" + +/************************************************************************ + * 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*)kmalloc((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*)kmalloc((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*)kmalloc((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); + } +} |