97 lines
3.1 KiB
C
97 lines
3.1 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011,2012 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file mail.c
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* @brief Threads mail code.
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*
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* @addtogroup mail
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* @{
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*/
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#include "ch.h"
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#include "mail.h"
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/**
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* @brief Initializes a Mail Pool.
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* @note The number of the mail objects in the mail pool should be at
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* least <b>2+size(mailbox)</b>, this considering one writer and
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* one reader, add one element for each extra reader or writer in
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* order to avoid waiting on the mail pool. A smaller number of
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* elements can be specified if waiting on the pool is acceptable.
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*
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* @param[out] mlp pointer to a @p MailPool structure
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* @param[in] size the size of the mail objects to be placed in the pool
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* @param[in] p pointer to the mail objects array first element
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* @param[in] n number of elements in the mail objects array
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*
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* @init
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*/
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void mailInit(MailPool *mlp, size_t size, void *p, size_t n) {
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chPoolInit(&mlp->pool, size, NULL);
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chPoolLoadArray(&mlp->pool, p, n);
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chSemInit(&mlp->sem, (cnt_t)n);
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}
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/**
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* @brief Allocates a mail object from a mail pool.
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* @pre The mail pool must be already been initialized.
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*
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* @param[in] mlp pointer to a @p MailPool structure
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* @param[in] time the number of ticks before the operation timeouts,
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* the following special values are allowed:
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* - @a TIME_IMMEDIATE immediate timeout.
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* - @a TIME_INFINITE no timeout.
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* .
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* @return The mail object.
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* @retval NULL timeout expired.
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*
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* @api
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*/
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void *mailCreate(MailPool *mlp, systime_t time) {
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msg_t msg;
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void *mailp;
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msg = chSemWaitTimeout(&mlp->sem, time);
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if (msg != RDY_OK)
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return NULL;
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mailp = chPoolAlloc(&mlp->pool);
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chDbgAssert(mailp != NULL, "mailCreate(), #1", "empty pool");
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return mailp;
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}
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/**
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* @brief Releases a mail object into a mail pool.
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* @pre The mail pool must be already been initialized.
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*
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* @param[in] mlp pointer to a @p MailPool structure
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* @param[in] mailp the pointer to the mail object to be released
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*
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* @api
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*/
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void mailDelete(MailPool *mlp, void *mailp) {
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chPoolFree(&mlp->pool, mailp);
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chSemSignal(&mlp->sem);
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}
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/** @} */
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