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Diffstat (limited to 'nuttx/sched/mq_initialize.c')
| -rw-r--r-- | nuttx/sched/mq_initialize.c | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/nuttx/sched/mq_initialize.c b/nuttx/sched/mq_initialize.c new file mode 100644 index 0000000000..deff6a2545 --- /dev/null +++ b/nuttx/sched/mq_initialize.c @@ -0,0 +1,246 @@ +/************************************************************ + * mq_initialize.c + * + * Copyright (C) 2007 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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 Gregory Nutt 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 <sys/types.h> /* uint32, etc. */ +#include <queue.h> +#include <nuttx/kmalloc.h> +#include "mq_internal.h" + +/************************************************************ + * Definitions + ************************************************************/ + +/************************************************************ + * Private Type Declarations + ************************************************************/ + +/* This is a container for a list of message queue + * descriptors. + */ + +struct mq_des_block_s +{ + sq_entry_t queue; + struct mq_des mqdes[NUM_MSG_DESCRIPTORS]; +}; + +/************************************************************ + * Global Variables + ************************************************************/ + +/* This is a list of all opened message queues */ + +sq_queue_t g_msgqueues; + +/* The g_msgfree is a list of messages that are available + * for general use. The number of messages in this list is a + * system configuration item. + */ + +sq_queue_t g_msgfree; + +/* The g_msgfreeInt is a list of messages that are reserved + * for use by interrupt handlers. + */ + +sq_queue_t g_msgfreeirq; + +/* The g_desfree data structure is a list of message + * descriptors available to the operating system for general use. + * The number of messages in the pool is a constant. + */ + +sq_queue_t g_desfree; + +/************************************************************ + * Private Variables + ************************************************************/ + +/* g_msgalloc is a pointer to the start of the allocated + * block of messages. + */ + +static mqmsg_t *g_msgalloc; + +/* g_msgfreeirqalloc is a pointer to the start of the + * allocated block of messages. + */ + +static mqmsg_t *g_msgfreeirqalloc; + +/* g_desalloc is a list of allocated block of message queue + * descriptors. + */ + +static sq_queue_t g_desalloc; + +/************************************************************ + * Private Functions + ************************************************************/ + +/************************************************************ + * Function: mq_msgblockalloc + * + * Description: + * Allocate a block of messages and place them on the free + * list. + * + * + * Inputs: + * queue + ************************************************************/ + +static mqmsg_t *mq_msgblockalloc(sq_queue_t *queue, uint16 nmsgs, + ubyte alloc_type) +{ + mqmsg_t *mqmsgblock; + + /* The g_msgfree must be loaded at initialization time to hold the + * configured number of messages. + */ + + mqmsgblock = (mqmsg_t*)kmalloc(sizeof(mqmsg_t) * nmsgs); + if (mqmsgblock) + { + mqmsg_t *mqmsg = mqmsgblock; + int i; + + for (i = 0; i < nmsgs; i++) + { + mqmsg->type = alloc_type; + sq_addlast((sq_entry_t*)mqmsg++, queue); + } + } + + return mqmsgblock; +} + +/************************************************************ + * Public Functions + ************************************************************/ + +/************************************************************ + * Function: mq_initialize + * + * Description: + * This function initializes the messasge system. This + * function must be called early in the initialization + * sequence before any of the other message interfaces + * execute. + * + * Inputs: + * None + * + * Return Value: + * None + * + ************************************************************/ + +void mq_initialize(void) +{ + /* Initialize the list of message queues */ + + sq_init(&g_msgqueues); + + /* Initialize the message free lists */ + + sq_init(&g_msgfree); + sq_init(&g_msgfreeirq); + sq_init(&g_desalloc); + + /* Allocate a block of messages for general use */ + + g_msgalloc = + mq_msgblockalloc(&g_msgfree, CONFIG_PREALLOC_MQ_MSGS, + MQ_ALLOC_FIXED); + + /* Allocate a block of messages for use exclusively by + * interrupt handlers + */ + + g_msgfreeirqalloc = + mq_msgblockalloc(&g_msgfreeirq, NUM_INTERRUPT_MSGS, + MQ_ALLOC_IRQ); + + /* Allocate a block of message queue descriptors */ + + mq_desblockalloc(); +} + +/************************************************************ + * Function: mq_desblockalloc + * + * Description: + * Allocate a block of message descriptors and place them + * on the free list. + * + * Inputs: + * None + * + * Return Value: + * None + * + ************************************************************/ + +void mq_desblockalloc(void) +{ + struct mq_des_block_s *mqdesblock; + + /* Allocate a block of message descriptors */ + + mqdesblock = (struct mq_des_block_s *)kmalloc(sizeof(struct mq_des_block_s)); + if (mqdesblock) + { + int i; + + /* Add the block to the list of allocated blocks (in case + * we ever need to reclaim the memory. + */ + + sq_addlast(&mqdesblock->queue, &g_desalloc); + + /* Then add each message queue descriptor to the free list */ + + for (i = 0; i < NUM_MSG_DESCRIPTORS; i++) + { + sq_addlast((sq_entry_t*)&mqdesblock->mqdes[i], &g_desfree); + } + } +} + |