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/*
ChibiOS/RT - Copyright (C) 2006-2007 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/>.
*/
/**
* @addtogroup VirtualTimers
* @{
*/
#ifndef _DELTA_H_
#define _DELTA_H_
/** Virtual Timer callback function.*/
typedef void (*vtfunc_t)(void *);
typedef struct VirtualTimer VirtualTimer;
/**
* Virtual Timer descriptor structure.
* @extends DeltaList
*/
struct VirtualTimer {
/** Next timer in the delta list.*/
VirtualTimer *vt_next;
/** Previous timer in the delta list.*/
VirtualTimer *vt_prev;
/** Time delta before timeout.*/
systime_t vt_dtime;
/** Timer callback function pointer. The pointer is reset to zero after
the callback is invoked.*/
vtfunc_t vt_func;
/** Timer callback function parameter.*/
void *vt_par;
};
/**
* Delta List header.
* @note The delta list is implemented as a double link bidirectional list in
* order to make the unlink time constant, the reset of a virtual timer
* is often used in the code.
*/
typedef struct {
/** Next timer in the list (the one that will be triggered next).*/
VirtualTimer *dl_next;
/** Last timer in the list.*/
VirtualTimer *dl_prev;
/** Not used but it must be set to -1.*/
systime_t dl_dtime;
volatile systime_t dl_stime;
} DeltaList;
extern DeltaList dlist;
#define chVTDoTickI() { \
dlist.dl_stime++; \
if (&dlist != (DeltaList *)dlist.dl_next) { \
VirtualTimer *vtp; \
\
--dlist.dl_next->vt_dtime; \
while (!(vtp = dlist.dl_next)->vt_dtime) { \
vtfunc_t fn = vtp->vt_func; \
vtp->vt_func = NULL; \
(vtp->vt_next->vt_prev = (void *)&dlist)->vt_next = vtp->vt_next; \
fn(vtp->vt_par); \
} \
} \
}
/** Infinite time specification.*/
#define TIME_INFINITE 0
/*
* Virtual Timers APIs.
*/
#ifdef __cplusplus
extern "C" {
#endif
void chVTInit(void);
void chVTSetI(VirtualTimer *vtp, systime_t time, vtfunc_t vtfunc, void *par);
void chVTResetI(VirtualTimer *vtp);
#ifdef __cplusplus
}
#endif
/** Returns TRUE if the speciified timer is armed.*/
#define chVTIsArmedI(vtp) ((vtp)->vt_func != NULL)
#endif /* _DELTA_H_ */
/** @} */
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