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 // -----------------------------------------------------------------------
41 //fosa_clocks_and_timers.c
42 //==============================================
43 // ******** ****** ******** **********
44 // **///// /** ** **////// /** /**
45 // ** /** ** /** /** /**
46 // ******* /** ** /********* /**********
47 // **//// /** ** ////////** /**//////**
48 // ** /** ** /** /** /**
49 // ** /** ** ******** /** /**
50 // // /******/ //////// // //
52 // FOSA(Frescor Operating System Adaptation layer)
53 //================================================
56 #include <fosa_clocks_and_timers.h>
62 static const struct timespec zero_time={0,0};
65 /*************************
67 *************************/
72 * Get the time from a clock
74 * This function sets the variable pointed to by current_time to the
75 * current value of the clock specified by clockid, which may be the
76 * FOSA_CLOCK_REALTIME constant or a value obtained with
77 * fosa_get_cputime_clock()
79 * Returns 0 if successful; otherwise it returns an error code:
80 * EINVAL: the value of clockid is invalid
82 * Alternatively, in case of error the implementation is allowed to
83 * notify it to the system console and then terminate the FRSH
84 * implementation and dependant applications
86 int fosa_clock_get_time(fosa_clock_id_t clockid, struct timespec *current_time)
88 return clock_gettime(clockid,current_time);
93 * fosa_get_cputime_clock()
95 * Get the identifier of a cpu-time clock
97 * This function stores in the variable pointed to by clockid the
98 * identifier of a cpu-time clock for the thread specified by tid.
100 * Returns 0 if successful; otherwise it returns an error code:
101 * EINVAL: the value of tid is invalid
103 * Alternatively, in case of error the implementation is allowed to
104 * notify it to the system console and then terminate the FRSH
105 * implementation and dependant applications
107 int fosa_thread_get_cputime_clock
108 (frsh_thread_id_t tid, fosa_clock_id_t *clockid)
110 return pthread_getcpuclockid(tid,clockid);
114 /*************************
116 *************************/
119 * fosa_create_timer()
121 * Create a one-shot timer
123 * This function creates a timer based on the clock specified by clock,
124 * and associates to this timer a notification mechanism consisting of
125 * a signal and associated information. Initially, the timer is in the
126 * disarmed state, i.e., not counting time. It can be armed to start
127 * counting time with fosa_timer_arm().
129 * The function stores the identifier of the newly created timer in the
130 * variable pointed to by timerid.
132 * When the timer expires, the signal number specified by signal will be
133 * sent together with the information specified by info, to the thread
134 * that armed the timer (@see fosa_timer_arm()).
136 * In those implementations that do not support queueing a
137 * signal with information to a thread (such as POSIX), the signal may
138 * be sent to any thread that is waiting for this signal via
139 * fosa_signal_wait(). Portability can be ensured by having the receiver
140 * thread be the one who is waiting for the signal.
142 * Returns 0 if successful; otherwise it returns an error code:
143 * EINVAL: the value of clockid or signal is invalid
145 * EAGAIN: the system lacks enough resources to create the timer
147 * Alternatively, in case of error the implementation is allowed to
148 * notify it to the system console and then terminate the FRSH
149 * implementation and dependant applications
151 int fosa_timer_create
152 (fosa_clock_id_t clockid, frsh_signal_t signal, frsh_signal_info_t info,
153 fosa_timer_id_t *timerid)
156 evp.sigev_notify=SIGEV_SIGNAL;
157 evp.sigev_signo=signal;
158 evp.sigev_value=*( (union sigval *) &info);
159 return timer_create(clockid,&evp,timerid);
165 * The function deletes the timer specified by timerid, which becomes
166 * unusable. If the timer was armed, it is automatically disarmed before
169 * Returns 0 if successful; otherwise it returns an error code:
170 * EINVAL: the value of timerid is not valid
172 * Alternatively, in case of error the implementation is allowed to
173 * notify it to the system console and then terminate the FRSH
174 * implementation and dependant applications
176 int fosa_timer_delete(fosa_timer_id_t timerid)
178 return timer_delete(timerid);
186 * The timer specified by timer is armed and starts counting time.
188 * If abstime is true, the value pointed to by value is the absolute
189 * time at which the timer will expire. If value specifies a time instant
190 * in the past, the timer expires immediately.
192 * If abstime is false, the value pointed to by value is the relative interval
193 * that must elapse for the timer to expire.
195 * In both cases, absolute or relative, the time is measured with the clock
196 * associated with the timer when it was created.
198 * If the timer was already armed, the previous time or interval is discarded
199 * and the timer is rearmed with the new value.
201 * When the timer expires, it is disarmed.
203 * Returns 0 if successful; otherwise it returns an error code:
204 * EINVAL: the value of timerid or value is invalid
206 * Alternatively, in case of error the implementation is allowed to
207 * notify it to the system console and then terminate the FRSH
208 * implementation and dependant applications
211 (fosa_timer_id_t timerid, bool abstime,
212 const struct timespec *value)
215 struct itimerspec timer_value;
217 // set the abstime flag if necessary
219 timer_abstime=TIMER_ABSTIME;
222 // set the timer to the specified value, one shot only
223 timer_value.it_value=*value;
224 timer_value.it_interval=zero_time;
227 return timer_settime(timerid,timer_abstime,&timer_value,NULL);
231 * fosa_timer_disarm()
235 * The timer specified by timer is disarmed, and will not expire unless
236 * it is rearmed. If the timer was already disramed, the function has
239 * Returns 0 if successful; otherwise it returns an error code:
240 * EINVAL: the value of timerid or value is invalid
242 * Alternatively, in case of error the implementation is allowed to
243 * notify it to the system console and then terminate the FRSH
244 * implementation and dependant applications
246 int fosa_timer_disarm(fosa_timer_id_t timerid, struct timespec *remaining_time)
248 struct itimerspec timer_value;
249 struct itimerspec it_remaining_time;
252 memset(&it_remaining_time, 0, sizeof(it_remaining_time) );
254 timer_value.it_value=zero_time;
255 timer_value.it_interval=zero_time;
257 if (remaining_time == NULL)
259 return timer_settime(timerid,0,&timer_value,NULL);
262 /* We need to return the remaining time */
263 error = timer_settime(timerid, 0, &timer_value, &it_remaining_time);
270 *remaining_time = it_remaining_time.it_value;