1 //----------------------------------------------------------------------
2 // Copyright (C) 2006 - 2007 by the FRESCOR consortium:
4 // Universidad de Cantabria, SPAIN
5 // University of York, UK
6 // Scuola Superiore Sant'Anna, ITALY
7 // Kaiserslautern University, GERMANY
8 // Univ. Politecnica Valencia, SPAIN
9 // Czech Technical University in Prague, CZECH REPUBLIC
11 // Thales Communication S.A. FRANCE
12 // Visual Tools S.A. SPAIN
13 // Rapita Systems Ltd UK
16 // See http://www.frescor.org
18 // The FRESCOR project (FP6/2005/IST/5-034026) is funded
19 // in part by the European Union Sixth Framework Programme
20 // The European Union is not liable of any use that may be
24 // based on previous work (FSF) done in the FIRST project
26 // Copyright (C) 2005 Mälardalen University, SWEDEN
27 // Scuola Superiore S.Anna, ITALY
28 // Universidad de Cantabria, SPAIN
29 // University of York, UK
31 // This file is part of FOSA (Frsh Operating System Abstraction)
33 // FOSA is free software; you can redistribute it and/or modify it
34 // under terms of the GNU General Public License as published by the
35 // Free Software Foundation; either version 2, or (at your option) any
36 // later version. FOSA is distributed in the hope that it will be
37 // useful, but WITHOUT ANY WARRANTY; without even the implied warranty
38 // of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
39 // General Public License for more details. You should have received a
40 // copy of the GNU General Public License along with FOSA; see file
41 // COPYING. If not, write to the Free Software Foundation, 675 Mass Ave,
42 // Cambridge, MA 02139, USA.
44 // As a special exception, including FOSA header files in a file,
45 // instantiating FOSA generics or templates, or linking other files
46 // with FOSA objects to produce an executable application, does not
47 // by itself cause the resulting executable application to be covered
48 // by the GNU General Public License. This exception does not
49 // however invalidate any other reasons why the executable file might be
50 // covered by the GNU Public License.
51 // -----------------------------------------------------------------------
52 //fosa_clocks_and_timers.h
53 //==============================================
54 // ******** ****** ******** **********
55 // **///// /** ** **////// /** /**
56 // ** /** ** /** /** /**
57 // ******* /** ** /********* /**********
58 // **//// /** ** ////////** /**//////**
59 // ** /** ** /** /** /**
60 // ** /** ** ******** /** /**
61 // // /******/ //////// // //
63 // FOSA(Frescor Operating System Adaptation layer)
64 //================================================
67 #ifndef FOSA_CLOCKS_AND_TIMERS_H_
68 #define FOSA_CLOCKS_AND_TIMERS_H_
70 #include "fosa_types.h"
71 #include "fosa_configuration_parameters.h"
74 * @defgroup clocksandtimers Clocks and Timers
77 * This module defines the types and functions to abstract clocks and
78 * timers for the FRSH implementation.
85 /*************************
87 *************************/
92 * Get the time from a clock
94 * This function sets the variable pointed to by current_time to the
95 * current value of the clock specified by clockid, which may be the
96 * FOSA_CLOCK_REALTIME constant or a value obtained with
97 * fosa_get_cputime_clock()
99 * Returns 0 if successful; otherwise it returns an error code:
100 * FOSA_EINVAL: the value of clockid is invalid
102 * Alternatively, in case of error the implementation is allowed to
103 * notify it to the system console and then terminate the FRSH
104 * implementation and dependant applications
106 int fosa_clock_get_time(fosa_clock_id_t clockid, struct timespec *current_time);
110 * fosa_get_cputime_clock()
112 * Get the identifier of a cpu-time clock
114 * This function stores in the variable pointed to by clockid the
115 * identifier of a cpu-time clock for the thread specified by tid.
117 * Returns 0 if successful; otherwise it returns an error code:
118 * FOSA_EINVAL: the value of tid is invalid
120 * Alternatively, in case of error the implementation is allowed to
121 * notify it to the system console and then terminate the FRSH
122 * implementation and dependant applications
124 int fosa_thread_get_cputime_clock(fosa_thread_id_t tid, fosa_clock_id_t *clockid);
127 /*************************
129 *************************/
132 * fosa_timer_create()
134 * Create a one-shot timer
136 * This function creates a timer based on the clock specified by clock,
137 * and associates to this timer a notification mechanism consisting of
138 * a signal and associated information. Initially, the timer is in the
139 * disarmed state, i.e., not counting time. It can be armed to start
140 * counting time with fosa_timer_arm().
142 * The function stores the identifier of the newly created timer in the
143 * variable pointed to by timerid.
145 * When the timer expires, the signal number specified by signal will be
146 * sent together with the information specified by info, to the thread
147 * that armed the timer (@see fosa_timer_arm()).
149 * In those implementations that do not support queueing a
150 * signal with information to a thread (such as POSIX), the signal may
151 * be sent to any thread that is waiting for this signal via
152 * fosa_signal_wait(). Portability can be ensured by having the receiver
153 * thread be the one who is waiting for the signal.
155 * Returns 0 if successful; otherwise it returns an error code:
156 * FOSA_EINVAL: the value of clockid or signal is invalid
158 * FOSA_EAGAIN: the system lacks enough resources to create the timer
160 * Alternatively, in case of error the implementation is allowed to
161 * notify it to the system console and then terminate the FRSH
162 * implementation and dependant applications
164 int fosa_timer_create
165 (fosa_clock_id_t clockid, fosa_signal_t signal, fosa_signal_info_t info,
166 fosa_timer_id_t *timerid);
169 * fosa_timer_create_with_receiver()
171 * Create a one-shot timer with a specific signal receiver thread
173 * This function creates a timer in the same way as fosa_timer_create,
174 * except that the signal generated when the timer expires is sent to
175 * the thread specified by receiver
177 * Returns 0 if successful; otherwise it returns an error code:
178 * FOSA_EINVAL: the value of clockid or signal is invalid
180 * FOSA_EAGAIN: the system lacks enough resources to create the timer
182 * Alternatively, in case of error the implementation is allowed to
183 * notify it to the system console and then terminate the FRSH
184 * implementation and dependant applications
186 int fosa_timer_create_with_receiver
187 (fosa_clock_id_t clockid, fosa_signal_t signal, fosa_signal_info_t info,
188 fosa_timer_id_t *timerid, fosa_thread_id_t receiver);
191 * fosa_timer_delete()
195 * The function deletes the timer specified by timerid, which becomes
196 * unusable. If the timer was armed, it is automatically disarmed before
199 * Returns 0 if successful; otherwise it returns an error code:
200 * FOSA_EINVAL: the value of timerid is not valid
202 * Alternatively, in case of error the implementation is allowed to
203 * notify it to the system console and then terminate the FRSH
204 * implementation and dependant applications
206 int fosa_timer_delete(fosa_timer_id_t timerid);
213 * The timer specified by timer is armed and starts counting time.
215 * If abstime is true, the value pointed to by value is the absolute
216 * time at which the timer will expire. If value specifies a time instant
217 * in the past, the timer expires immediately.
219 * If abstime is false, the value pointed to by value is the relative interval
220 * that must elapse for the timer to expire.
222 * In both cases, absolute or relative, the time is measured with the clock
223 * associated with the timer when it was created.
225 * If the timer was already armed, the previous time or interval is discarded
226 * and the timer is rearmed with the new value.
228 * When the timer expires, it is disarmed.
230 * Returns 0 if successful; otherwise it returns an error code:
231 * FOSA_EINVAL: the value of timerid or value is invalid
233 * Alternatively, in case of error the implementation is allowed to
234 * notify it to the system console and then terminate the FRSH
235 * implementation and dependant applications
238 (fosa_timer_id_t timerid, bool abstime,
239 const struct timespec *value);
242 * fosa_timer_get_remaining_time()
244 * Get the remaining time for timer expiration
246 * Returns the relative remaining time for timer expiration. If the
247 * clock is a CPU clock it returns the time as if the thread was
248 * executing constantly.
250 * If the timer is disarmed it returns 0.
252 * Returns 0 if successful; otherwise it returns an error code:
253 * FOSA_EINVAL: the value of timerid or value is invalid
255 * Alternatively, in case of error the implementation is allowed to
256 * notify it to the system console and then terminate the FRSH
257 * implementation and dependant applications
259 int fosa_timer_get_remaining_time
260 (fosa_timer_id_t timerid, struct timespec *remaining_time);
263 * fosa_timer_disarm()
265 * Disarm a timer and optionally obtain remaining time before expiration
267 * The timer specified by timer is disarmed, and will not expire unless
268 * it is rearmed. If the timer was already disramed, the function has
271 * If the pointer remaining_time is != NULL, the remaining time before
272 * expiration will be returned in that pointer. If the timer was
273 * disarmed a 0 value will be set.
275 * Returns 0 if successful; otherwise it returns an error code:
276 * FOSA_EINVAL: the value of timerid or value is invalid
278 * Alternatively, in case of error the implementation is allowed to
279 * notify it to the system console and then terminate the FRSH
280 * implementation and dependant applications
282 int fosa_timer_disarm(fosa_timer_id_t timerid, struct timespec
289 #endif /* !FOSA_CLOCKS_AND_TIMERS_H_ */