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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012,2013 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file chlists.h
* @brief Thread queues and lists header.
*
* @addtogroup queues_list
* @{
*/
#ifndef _CHLISTS_H_
#define _CHLISTS_H_
/*===========================================================================*/
/* Module constants. */
/*===========================================================================*/
/*===========================================================================*/
/* Module pre-compile time settings. */
/*===========================================================================*/
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
/*===========================================================================*/
/* Module data structures and types. */
/*===========================================================================*/
/*===========================================================================*/
/* Module macros. */
/*===========================================================================*/
/**
* @brief Data part of a static threads queue initializer.
* @details This macro should be used when statically initializing a threads
* queue that is part of a bigger structure.
*
* @param[in] name the name of the threads queue variable
*/
#define _threads_queue_t_DATA(name) {(thread_t *)&name, (thread_t *)&name}
/**
* @brief Static threads queue initializer.
* @details Statically initialized threads queues require no explicit
* initialization using @p queue_init().
*
* @param[in] name the name of the threads queue variable
*/
#define threads_queue_t_DECL(name) \
threads_queue_t name = _threads_queue_t_DATA(name)
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
msg_t chQueueGoSleepTimeoutS(threads_queue_t *tqp, systime_t timeout);
void chQueueWakeupOneI(threads_queue_t *tqp, msg_t msg);
void chQueueWakeupAllI(threads_queue_t *tqp, msg_t msg);
#ifdef __cplusplus
}
#endif
/*===========================================================================*/
/* Module inline functions. */
/*===========================================================================*/
/**
* @brief Threads list initialization.
*
* @notapi
*/
static inline void list_init(threads_list_t *tlp) {
tlp->p_next = (thread_t *)tlp;
}
/**
* @brief Evaluates to @p true if the specified threads list is empty.
*
* @notapi
*/
static inline bool list_isempty(threads_list_t *tlp) {
return (bool)(tlp->p_next == (thread_t *)tlp);
}
/**
* @brief Evaluates to @p true if the specified threads list is not empty.
*
* @notapi
*/
static inline bool list_notempty(threads_list_t *tlp) {
return (bool)(tlp->p_next != (thread_t *)tlp);
}
/**
* @brief Threads queue initialization.
*
* @notapi
*/
static inline void queue_init(threads_queue_t *tqp) {
tqp->p_next = tqp->p_prev = (thread_t *)tqp;
}
/**
* @brief Evaluates to @p true if the specified threads queue is empty.
*
* @notapi
*/
static inline bool queue_isempty(threads_queue_t *tqp) {
return (bool)(tqp->p_next == (thread_t *)tqp);
}
/**
* @brief Evaluates to @p true if the specified threads queue is not empty.
*
* @notapi
*/
static inline bool queue_notempty(threads_queue_t *tqp) {
return (bool)(tqp->p_next != (thread_t *)tqp);
}
/* If the performance code path has been chosen then all the following
functions are inlined into the various kernel modules.*/
#if CH_CFG_OPTIMIZE_SPEED
static inline void list_insert(thread_t *tp, threads_list_t *tlp) {
tp->p_next = tlp->p_next;
tlp->p_next = tp;
}
static inline thread_t *list_remove(threads_list_t *tlp) {
thread_t *tp = tlp->p_next;
tlp->p_next = tp->p_next;
return tp;
}
static inline void queue_prio_insert(thread_t *tp, threads_queue_t *tqp) {
thread_t *cp = (thread_t *)tqp;
do {
cp = cp->p_next;
} while ((cp != (thread_t *)tqp) && (cp->p_prio >= tp->p_prio));
tp->p_next = cp;
tp->p_prev = cp->p_prev;
tp->p_prev->p_next = cp->p_prev = tp;
}
static inline void queue_insert(thread_t *tp, threads_queue_t *tqp) {
tp->p_next = (thread_t *)tqp;
tp->p_prev = tqp->p_prev;
tp->p_prev->p_next = tqp->p_prev = tp;
}
static inline thread_t *queue_fifo_remove(threads_queue_t *tqp) {
thread_t *tp = tqp->p_next;
(tqp->p_next = tp->p_next)->p_prev = (thread_t *)tqp;
return tp;
}
static inline thread_t *queue_lifo_remove(threads_queue_t *tqp) {
thread_t *tp = tqp->p_prev;
(tqp->p_prev = tp->p_prev)->p_next = (thread_t *)tqp;
return tp;
}
static inline thread_t *queue_dequeue(thread_t *tp) {
tp->p_prev->p_next = tp->p_next;
tp->p_next->p_prev = tp->p_prev;
return tp;
}
#endif /* CH_CFG_OPTIMIZE_SPEED */
/**
* @brief Initializes a threads queue object.
*
* @param[out] tqp pointer to the threads queue object
*
* @init
*/
static inline void chQueueObjectInit(threads_queue_t *tqp) {
queue_init(tqp);
}
#endif /* _CHLISTS_H_ */
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