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