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_clocks_and_timers.h"
63 /*************************
65 *************************/
67 int fosa_clock_get_time(fosa_clock_id_t clockid,
68 struct timespec *current_time)
70 return clock_gettime(clockid, current_time);
73 int fosa_thread_get_cputime_clock(fosa_thread_id_t tid,
74 fosa_clock_id_t *clockid)
76 if (tid.linux_pid == tid.linux_tid) {
77 /* standard UNIX process */
78 *clockid = FOSA_CLOCK_REALTIME;
82 return pthread_getcpuclockid(tid.pthread_id, clockid);
85 /*************************
87 *************************/
92 * Create a one-shot timer
94 * This function creates a timer based on the clock specified by clock,
95 * and associates to this timer a notification mechanism consisting of
96 * a signal and associated information. Initially, the timer is in the
97 * disarmed state, i.e., not counting time. It can be armed to start
98 * counting time with fosa_timer_arm().
100 * The function stores the identifier of the newly created timer in the
101 * variable pointed to by timerid.
103 * When the timer expires, the signal number specified by signal will be
104 * sent together with the information specified by info, to the thread
105 * that armed the timer (@see fosa_timer_arm()).
107 * Note that, since this is a POSIX implementation, the signal will be sent
108 * to any thread waiting fot it (in a given UNIX process).
109 * No signal-waiting thread or similar strategy is implemented, the specific
110 * thread can be choosed (for example) by means of the signal number.
112 * Returns 0 if successful; otherwise it returns an error code:
113 * EINVAL: the value of clockid or signal is invalid
115 * EAGAIN: the system lacks enough resources to create the timer
117 int fosa_timer_create(fosa_clock_id_t clockid,
118 fosa_signal_t signal,
119 fosa_signal_info_t info,
120 fosa_timer_id_t *timerid)
122 struct sigevent event;
124 event.sigev_notify = SIGEV_SIGNAL;
125 event.sigev_signo = signal;
126 //event.sigev_value.sival_int = info.sival_int;
127 event.sigev_value = *((union sigval*) &info);
129 return timer_create(clockid, &event, timerid);
133 * fosa_timer_create_with_receiver()
135 * Create a one-shot timer with a specific signal receiver thread
137 * This function creates a timer in the same way as fosa_timer_create,
138 * except that the signal generated when the timer expires is sent to
139 * the thread specified by receiver
141 * In this implementation, since in POSIX we can not specify a receiver,
142 * always returns ENOSYS.
144 * You have to use the "simple" fosa_timer_create.
146 int fosa_timer_create_with_receiver(fosa_clock_id_t clockid,
147 fosa_signal_t signal,
148 fosa_signal_info_t info,
149 fosa_timer_id_t *timerid,
150 fosa_thread_id_t receiver)
152 /* in POSIX the receiver thread cannot be specified!! */
153 //return fosa_timer_create(clockid, signal, info, timerid);
160 * The function deletes the timer specified by timerid, which becomes
161 * unusable. If the timer was armed, it is automatically disarmed before
164 * Returns 0 if successful; otherwise it returns an error code:
165 * EINVAL: the value of timerid is not valid
167 int fosa_timer_delete(fosa_timer_id_t timerid)
169 return timer_delete(timerid);
177 * The timer specified by timer is armed and starts counting time.
179 * If abstime is true, the value pointed to by value is the absolute
180 * time at which the timer will expire. If value specifies a time instant
181 * in the past, the timer expires immediately.
183 * If abstime is false, the value pointed to by value is the relative interval
184 * that must elapse for the timer to expire.
186 * In both cases, absolute or relative, the time is measured with the clock
187 * associated with the timer when it was created.
189 * If the timer was already armed, the previous time or interval is discarded
190 * and the timer is rearmed with the new value.
192 * When the timer expires, it is disarmed.
194 * Returns 0 if successful; otherwise it returns an error code:
195 * EINVAL: the value of timerid or value is invalid
197 int fosa_timer_arm (fosa_timer_id_t timerid,
199 const struct timespec *value)
201 struct itimerspec when;
203 /* non-periodic one shot timer configuration */
204 when.it_value = *value;
205 when.it_interval.tv_sec = 0;
206 when.it_interval.tv_nsec = 0;
208 return timer_settime(timerid,
209 (abstime ? TIMER_ABSTIME : 0),
215 * fosa_timer_get_remaining_time()
217 * Get the remaining time for timer expiration
219 * Returns the relative remaining time for timer expiration. If the
220 * clock is a CPU clock it returns the time as if the thread was
221 * executing constantly.
223 * If the timer is disarmed it returns 0.
225 * Returns 0 if successful; otherwise it returns an error code:
226 * EINVAL: the value of timerid or value is invalid
228 int fosa_timer_get_remaining_time(fosa_timer_id_t timerid,
229 struct timespec *remaining_time)
232 struct itimerspec time;
234 if (remaining_time != NULL) {
235 if ((error = timer_gettime(timerid, &time)) == -1)
238 *remaining_time = time.it_value;
246 * fosa_timer_disarm()
250 * The timer specified by timer is disarmed, and will not expire unless
251 * it is rearmed. If the timer was already disramed, the function has
254 * If the pointer remaining_time is != NULL, the remaining time before
255 * expiration will be returned in that pointer. If the timer was
256 * disarmed a 0 value will be set.
258 * Returns 0 if successful; otherwise it returns an error code:
259 * EINVAL: the value of timerid or value is invalid
261 int fosa_timer_disarm(fosa_timer_id_t timerid,
262 struct timespec *remaining_time)
265 struct itimerspec time;
267 if (remaining_time != NULL) {
268 if ((error = timer_gettime(timerid, &time)) == -1)
271 *remaining_time = time.it_value;
274 time.it_value.tv_sec = 0;
275 time.it_value.tv_nsec = 0;
277 return timer_settime(timerid, 0, &time, NULL);