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"
61 static const struct timespec zero_time={0,0};
64 /*************************
66 *************************/
71 * Get the time from a clock
73 * This function sets the variable pointed to by current_time to the
74 * current value of the clock specified by clockid, which may be the
75 * FOSA_CLOCK_REALTIME constant or a value obtained with
76 * fosa_get_cputime_clock()
78 * Returns 0 if successful; otherwise it returns an error code:
79 * EINVAL: the value of clockid is invalid
81 * Alternatively, in case of error the implementation is allowed to
82 * notify it to the system console and then terminate the FRSH
83 * implementation and dependant applications
85 int fosa_clock_get_time(fosa_clock_id_t clockid, struct timespec *current_time)
87 return clock_gettime(clockid,current_time);
92 * fosa_get_cputime_clock()
94 * Get the identifier of a cpu-time clock
96 * This function stores in the variable pointed to by clockid the
97 * identifier of a cpu-time clock for the thread specified by tid.
99 * Returns 0 if successful; otherwise it returns an error code:
100 * EINVAL: the value of tid 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_thread_get_cputime_clock
107 (frsh_thread_id_t tid, fosa_clock_id_t *clockid)
109 return pthread_getcpuclockid(tid,clockid);
113 /*************************
115 *************************/
118 * fosa_create_timer()
120 * Create a one-shot timer
122 * This function creates a timer based on the clock specified by clock,
123 * and associates to this timer a notification mechanism consisting of
124 * a signal and associated information. Initially, the timer is in the
125 * disarmed state, i.e., not counting time. It can be armed to start
126 * counting time with fosa_timer_arm().
128 * The function stores the identifier of the newly created timer in the
129 * variable pointed to by timerid.
131 * When the timer expires, the signal number specified by signal will be
132 * sent together with the information specified by info, to the thread
133 * that armed the timer (@see fosa_timer_arm()).
135 * In those implementations that do not support queueing a
136 * signal with information to a thread (such as POSIX), the signal may
137 * be sent to any thread that is waiting for this signal via
138 * fosa_signal_wait(). Portability can be ensured by having the receiver
139 * thread be the one who is waiting for the signal.
141 * Returns 0 if successful; otherwise it returns an error code:
142 * EINVAL: the value of clockid or signal is invalid
144 * EAGAIN: the system lacks enough resources to create the timer
146 * Alternatively, in case of error the implementation is allowed to
147 * notify it to the system console and then terminate the FRSH
148 * implementation and dependant applications
150 int fosa_timer_create
151 (fosa_clock_id_t clockid, frsh_signal_t signal, frsh_signal_info_t info,
152 fosa_timer_id_t *timerid)
155 evp.sigev_notify=SIGEV_SIGNAL;
156 evp.sigev_signo=signal;
157 evp.sigev_value=* ((union sigval *) &info);
158 // the above casting construct is used to overcome the compiler
159 // restriction that does not allow casts between unions
160 return timer_create(clockid,&evp,timerid);
166 * The function deletes the timer specified by timerid, which becomes
167 * unusable. If the timer was armed, it is automatically disarmed before
170 * Returns 0 if successful; otherwise it returns an error code:
171 * EINVAL: the value of timerid is not valid
173 * Alternatively, in case of error the implementation is allowed to
174 * notify it to the system console and then terminate the FRSH
175 * implementation and dependant applications
177 int fosa_timer_delete(fosa_timer_id_t timerid)
179 return timer_delete(timerid);
187 * The timer specified by timer is armed and starts counting time.
189 * If abstime is true, the value pointed to by value is the absolute
190 * time at which the timer will expire. If value specifies a time instant
191 * in the past, the timer expires immediately.
193 * If abstime is false, the value pointed to by value is the relative interval
194 * that must elapse for the timer to expire.
196 * In both cases, absolute or relative, the time is measured with the clock
197 * associated with the timer when it was created.
199 * If the timer was already armed, the previous time or interval is discarded
200 * and the timer is rearmed with the new value.
202 * When the timer expires, it is disarmed.
204 * Returns 0 if successful; otherwise it returns an error code:
205 * EINVAL: the value of timerid or value is invalid
207 * Alternatively, in case of error the implementation is allowed to
208 * notify it to the system console and then terminate the FRSH
209 * implementation and dependant applications
212 (fosa_timer_id_t timerid, bool abstime,
213 const struct timespec *value)
216 struct itimerspec timer_value;
218 // set the abstime flag if necessary
220 timer_abstime=TIMER_ABSTIME;
223 // set the timer to the specified value, one shot only
224 timer_value.it_value=*value;
225 timer_value.it_interval=zero_time;
228 return timer_settime(timerid,timer_abstime,&timer_value,NULL);
232 * fosa_timer_disarm()
236 * The timer specified by timer is disarmed, and will not expire unless
237 * it is rearmed. If the timer was already disramed, the function has
240 * If the pointer remaining_time is != NULL, the remaining time before
241 * expiration will be returned in that pointer. If the timer was
242 * disarmed a 0 value will be set.
244 * Returns 0 if successful; otherwise it returns an error code:
245 * EINVAL: the value of timerid or value is invalid
247 * Alternatively, in case of error the implementation is allowed to
248 * notify it to the system console and then terminate the FRSH
249 * implementation and dependant applications
251 int fosa_timer_disarm
252 (fosa_timer_id_t timerid,
253 struct timespec *remaining_time)
255 struct itimerspec timer_value;
258 if (remaining_time!=NULL) {
259 error_code=timer_gettime(timerid,&timer_value);
260 if (error_code==-1) return errno;
261 *remaining_time=timer_value.it_value;
263 timer_value.it_value=zero_time;
264 timer_value.it_interval=zero_time;
265 return timer_settime(timerid,0,&timer_value,NULL);