You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
202 lines
7.2 KiB
C
202 lines
7.2 KiB
C
/*
|
|
ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio.
|
|
|
|
This file is part of ChibiOS.
|
|
|
|
ChibiOS 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 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 nil/src/chmsg.c
|
|
* @brief Nil RTOS synchronous messages source file.
|
|
*
|
|
* @addtogroup NIL_MESSAGES
|
|
* @{
|
|
*/
|
|
|
|
#include "ch.h"
|
|
|
|
#if (CH_CFG_USE_MESSAGES == TRUE) || defined(__DOXYGEN__)
|
|
|
|
/*===========================================================================*/
|
|
/* Module local definitions. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Module exported variables. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Module local variables. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Module local functions. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Module interrupt handlers. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Module exported functions. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief Sends a message to the specified thread.
|
|
* @details The sender is stopped until the receiver executes a
|
|
* @p chMsgRelease()after receiving the message.
|
|
*
|
|
* @param[in] tp the pointer to the thread
|
|
* @param[in] msg the message
|
|
* @return The answer message from @p chMsgRelease().
|
|
*
|
|
* @api
|
|
*/
|
|
msg_t chMsgSend(thread_t *tp, msg_t msg) {
|
|
thread_t *ctp = nil.current;
|
|
|
|
chDbgCheck(tp != NULL);
|
|
|
|
chSysLock();
|
|
ctp->sntmsg = msg;
|
|
ctp->u1.tp = tp;
|
|
if (NIL_THD_IS_WTMSG(tp)) {
|
|
(void) chSchReadyI(tp, (msg_t)ctp);
|
|
}
|
|
msg = chSchGoSleepTimeoutS(NIL_STATE_SNDMSGQ, TIME_INFINITE);
|
|
chSysUnlock();
|
|
|
|
return msg;
|
|
}
|
|
|
|
/**
|
|
* @brief Suspends the thread and waits for an incoming message.
|
|
* @post After receiving a message the function @p chMsgGet() must be
|
|
* called in order to retrieve the message and then @p chMsgRelease()
|
|
* must be invoked in order to acknowledge the reception and send
|
|
* the answer.
|
|
* @note If the message is a pointer then you can assume that the data
|
|
* pointed by the message is stable until you invoke @p chMsgRelease()
|
|
* because the sending thread is suspended until then.
|
|
* @note The reference counter of the sender thread is not increased, the
|
|
* returned pointer is a temporary reference.
|
|
*
|
|
* @return A pointer to the thread carrying the message.
|
|
*
|
|
* @api
|
|
*/
|
|
thread_t *chMsgWait(void) {
|
|
thread_t *tp;
|
|
|
|
chSysLock();
|
|
tp = chMsgWaitS();
|
|
chSysUnlock();
|
|
|
|
return tp;
|
|
}
|
|
|
|
/**
|
|
* @brief Suspends the thread and waits for an incoming message or a
|
|
* timeout to occur.
|
|
* @post After receiving a message the function @p chMsgGet() must be
|
|
* called in order to retrieve the message and then @p chMsgRelease()
|
|
* must be invoked in order to acknowledge the reception and send
|
|
* the answer.
|
|
* @note If the message is a pointer then you can assume that the data
|
|
* pointed by the message is stable until you invoke @p chMsgRelease()
|
|
* because the sending thread is suspended until then.
|
|
* @note The reference counter of the sender thread is not increased, the
|
|
* returned pointer is a temporary reference.
|
|
*
|
|
* @param[in] timeout the number of ticks before the operation timeouts,
|
|
* the following special values are allowed:
|
|
* - @a TIME_IMMEDIATE immediate timeout.
|
|
* - @a TIME_INFINITE no timeout.
|
|
* .
|
|
* @return A pointer to the thread carrying the message.
|
|
* @retval NULL if a timeout occurred.
|
|
*
|
|
* @api
|
|
*/
|
|
thread_t *chMsgWaitTimeout(sysinterval_t timeout) {
|
|
thread_t *tp;
|
|
|
|
chSysLock();
|
|
tp = chMsgWaitTimeoutS(timeout);
|
|
chSysUnlock();
|
|
|
|
return tp;
|
|
}
|
|
|
|
/**
|
|
* @brief Suspends the thread and waits for an incoming message or a
|
|
* timeout to occur.
|
|
* @post After receiving a message the function @p chMsgGet() must be
|
|
* called in order to retrieve the message and then @p chMsgRelease()
|
|
* must be invoked in order to acknowledge the reception and send
|
|
* the answer.
|
|
* @note If the message is a pointer then you can assume that the data
|
|
* pointed by the message is stable until you invoke @p chMsgRelease()
|
|
* because the sending thread is suspended until then.
|
|
* @note The reference counter of the sender thread is not increased, the
|
|
* returned pointer is a temporary reference.
|
|
*
|
|
* @param[in] timeout the number of ticks before the operation timeouts,
|
|
* the following special values are allowed:
|
|
* - @a TIME_INFINITE no timeout.
|
|
* .
|
|
* @return A pointer to the thread carrying the message.
|
|
* @retval NULL if a timeout occurred.
|
|
*
|
|
* @sclass
|
|
*/
|
|
thread_t *chMsgWaitTimeoutS(sysinterval_t timeout) {
|
|
thread_t *tp;
|
|
|
|
chDbgCheckClassS();
|
|
|
|
tp = nil_find_thread(NIL_STATE_SNDMSGQ, nil.current);
|
|
if (tp == NULL) {
|
|
msg_t msg = chSchGoSleepTimeoutS(NIL_STATE_WTMSG, timeout);
|
|
if (msg != MSG_TIMEOUT) {
|
|
return (thread_t *)msg;
|
|
}
|
|
}
|
|
|
|
return tp;
|
|
}
|
|
|
|
/**
|
|
* @brief Releases a sender thread specifying a response message.
|
|
* @pre Invoke this function only after a message has been received
|
|
* using @p chMsgWait().
|
|
*
|
|
* @param[in] tp pointer to the thread
|
|
* @param[in] msg message to be returned to the sender
|
|
*
|
|
* @api
|
|
*/
|
|
void chMsgRelease(thread_t *tp, msg_t msg) {
|
|
|
|
chSysLock();
|
|
chDbgAssert(tp->state == NIL_STATE_SNDMSGQ, "invalid state");
|
|
chMsgReleaseS(tp, msg);
|
|
chSysUnlock();
|
|
}
|
|
|
|
#endif /* CH_CFG_USE_MESSAGES == TRUE */
|
|
|
|
/** @} */
|