1 // -----------------------------------------------------------------------
2 // Copyright (C) 2006 - 2007 FRESCOR consortium partners:
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 for a link to partners' websites
18 // 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
23 // This file is part of the FRSH implementation
25 // FRSH is free software; you can redistribute it and/or modify
26 // it under the terms of the GNU General Public License as published by
27 // the Free Software Foundation; either version 2, or (at your option)
30 // FRSH is distributed in the hope that it will be useful, but
31 // WITHOUT ANY WARRANTY; without even the implied warranty of
32 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
33 // General Public License for more details.
35 // You should have received a copy of the GNU General Public License
36 // distributed with FRSH; see file COPYING. If not, write to the
37 // Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
40 // As a special exception, if you include this header file into source
41 // files to be compiled, this header file does not by itself cause
42 // the resulting executable to be covered by the GNU General Public
43 // License. This exception does not however invalidate any other
44 // reasons why the executable file might be covered by the GNU General
46 // -----------------------------------------------------------------------
48 //==============================================
49 // ******** ****** ******** **********
50 // **///// /** ** **////// /** /**
51 // ** /** ** /** /** /**
52 // ******* /** ** /********* /**********
53 // **//// /** ** ////////** /**//////**
54 // ** /** ** /** /** /**
55 // ** /** ** ******** /** /**
56 // // /******/ //////// // //
58 // FOSA(Frescor Operating System Adaptation layer)
59 //================================================
61 #include "fosa_time.h"
62 #include "fosa_clocks_and_timers.h"
64 static const struct timespec zero_time={0,0};
67 /*************************
69 *************************/
74 * Get the time from a clock
76 * This function sets the variable pointed to by current_time to the
77 * current value of the clock specified by clockid, which may be the
78 * FOSA_CLOCK_REALTIME constant or a value obtained with
79 * fosa_get_cputime_clock()
81 * Returns 0 if successful; otherwise it returns an error code:
82 * EINVAL: the value of clockid is invalid
84 int fosa_clock_get_time(fosa_clock_id_t clockid,
85 fosa_abs_time_t *current_time)
88 struct timespec current_time_tspec;
90 ret = clock_gettime(clockid, ¤t_time_tspec);
91 *current_time = fosa_timespec_to_abs_time(current_time_tspec);
97 * fosa_get_cputime_clock()
99 * Get the identifier of a cpu-time clock
101 * This function stores in the variable pointed to by clockid the
102 * identifier of a cpu-time clock for the thread specified by tid.
104 * Returns 0 if successful; otherwise it returns an error code:
105 * EINVAL: the value of tid is invalid
107 int fosa_thread_get_cputime_clock(fosa_thread_id_t tid,
108 fosa_clock_id_t *clockid)
110 if (tid.linux_pid == tid.linux_tid) {
111 /* standard UNIX process */
112 return clock_getcpuclockid(tid.linux_pid, clockid);
115 return pthread_getcpuclockid(tid.pthread_id, clockid);
119 /*************************
121 *************************/
124 * fosa_create_timer()
126 * Create a one-shot timer
128 * This function creates a timer based on the clock specified by clock,
129 * and associates to this timer a notification mechanism consisting of
130 * a signal and associated information. Initially, the timer is in the
131 * disarmed state, i.e., not counting time. It can be armed to start
132 * counting time with fosa_timer_arm().
134 * The function stores the identifier of the newly created timer in the
135 * variable pointed to by timerid.
137 * When the timer expires, the signal number specified by signal will be
138 * sent together with the information specified by info, to the thread
139 * that armed the timer (@see fosa_timer_arm()).
141 * Note that, since this is a POSIX implementation, the signal will be sent
142 * to any thread waiting fot it (in a given UNIX process).
143 * No signal-waiting thread or similar strategy is implemented, the specific
144 * thread can be choosed (for example) by means of the signal number.
146 * Returns 0 if successful; otherwise it returns an error code:
147 * EINVAL: the value of clockid or signal is invalid
149 * EAGAIN: the system lacks enough resources to create the timer
151 int fosa_timer_create(fosa_clock_id_t clockid,
152 fosa_signal_t signal,
153 fosa_signal_info_t info,
154 fosa_timer_id_t *timerid)
156 struct sigevent event;
158 event.sigev_notify = SIGEV_SIGNAL;
159 event.sigev_signo = signal;
160 event.sigev_value = *((union sigval*) &info);
162 return timer_create(clockid, &event, timerid);
166 * fosa_timer_create_with_receiver()
168 * Create a one-shot timer with a specific signal receiver thread
170 * This function creates a timer in the same way as fosa_timer_create,
171 * except that the signal generated when the timer expires is sent to
172 * the thread specified by receiver
174 * You have to use the "simple" fosa_timer_create.
176 int fosa_timer_create_with_receiver(fosa_clock_id_t clockid,
177 fosa_signal_t signal,
178 fosa_signal_info_t info,
179 fosa_timer_id_t *timerid,
180 fosa_thread_id_t receiver)
182 struct sigevent event;
184 event.sigev_notify = SIGEV_SIGNAL;
185 event.sigev_signo = signal;
186 event.sigev_value = *((union sigval*) &info);
187 event.sigev_notify = SIGEV_THREAD_ID | SIGEV_SIGNAL;
188 event._sigev_un._tid = receiver.linux_tid;
190 return timer_create(clockid, &event, timerid);
196 * The function deletes the timer specified by timerid, which becomes
197 * unusable. If the timer was armed, it is automatically disarmed before
200 * Returns 0 if successful; otherwise it returns an error code:
201 * EINVAL: the value of timerid is not valid
203 int fosa_timer_delete(fosa_timer_id_t timerid)
205 return timer_delete(timerid);
209 * fosa_rel_timer_arm()
211 * Arm a timer with a relative time interval
213 * The timer specified by timer is armed and starts counting time.
215 * The value pointed to by value is the relative interval that must
216 * elapse for the timer to expire. Negative values cause the timer to
217 * expire immediately.
219 * The time is measured with the clock associated with the timer when
222 * If the timer was already armed, the previous time or interval is discarded
223 * and the timer is rearmed with the new value.
225 * When the timer expires, it is disarmed.
227 * Returns 0 if successful; otherwise it returns an error code:
228 * FOSA_EINVAL: the value of timerid or value is invalid
230 * Alternatively, in case of error the implementation is allowed to
231 * notify it to the system console and then terminate the FRSH
232 * implementation and dependant applications
234 int fosa_rel_timer_arm (fosa_timer_id_t timerid, const fosa_rel_time_t *value)
236 struct itimerspec when;
238 /* non-periodic one shot timer */
239 when.it_value = fosa_abs_time_to_timespec(*value);
240 when.it_interval = zero_time;
242 return timer_settime(timerid, 0, &when, NULL);
247 * fosa_abs_timer_arm()
249 * Arm a timer that will expire in an absolute time instant.
251 * The timer specified by timer is armed and starts counting time.
253 * The value pointed to by value is the absolute time at which the
254 * timer will expire. If value specifies a time instant in the past,
255 * the timer expires immediately.
257 * The time is measured with the clock associated with the timer when
260 * If the timer was already armed, the previous time or interval is discarded
261 * and the timer is rearmed with the new value.
263 * When the timer expires, it is disarmed.
265 * Returns 0 if successful; otherwise it returns an error code:
266 * FOSA_EINVAL: the value of timerid or value is invalid
268 * Alternatively, in case of error the implementation is allowed to
269 * notify it to the system console and then terminate the FRSH
270 * implementation and dependant applications
272 int fosa_abs_timer_arm(fosa_timer_id_t timerid, const fosa_abs_time_t *value)
274 struct itimerspec when;
276 /* non-periodic one shot timer */
277 when.it_value= fosa_abs_time_to_timespec(*value);
278 when.it_interval=zero_time;
280 return timer_settime(timerid, TIMER_ABSTIME, &when, NULL);
284 * fosa_timer_get_remaining_time()
286 * Get the remaining time for timer expiration
288 * Returns the relative remaining time for timer expiration. If the
289 * clock is a CPU clock it returns the time as if the thread was
290 * executing constantly.
292 * If the timer is disarmed it returns 0.
294 * Returns 0 if successful; otherwise it returns an error code:
295 * EINVAL: the value of timerid or value is invalid
297 int fosa_timer_get_remaining_time(fosa_timer_id_t timerid,
298 fosa_rel_time_t *remaining_time)
301 struct itimerspec time;
303 if (remaining_time == NULL)
306 ret = timer_gettime(timerid, &time);
307 *remaining_time = fosa_timespec_to_rel_time(time.it_value);
313 * fosa_timer_disarm()
317 * The timer specified by timer is disarmed, and will not expire unless
318 * it is rearmed. If the timer was already disramed, the function has
321 * If the pointer remaining_time is != NULL, the remaining time before
322 * expiration will be returned in that pointer. If the timer was
323 * disarmed a 0 value will be set.
325 * Returns 0 if successful; otherwise it returns an error code:
326 * EINVAL: the value of timerid or value is invalid
328 int fosa_timer_disarm(fosa_timer_id_t timerid,
329 struct timespec *remaining_time)
332 struct itimerspec time;
334 if (remaining_time == NULL)
337 ret = timer_gettime(timerid, &time);
338 *remaining_time = fosa_timespec_to_rel_time(time.it_value);
342 time.it_value = zero_time;
343 time.it_interval = zero_time;
345 return timer_settime(timerid, 0, &time, NULL);