// FOSA(Frescor Operating System Adaptation layer)
//================================================
-#include <fosa.h>
+#include "fosa_clocks_and_timers.h"
/*************************
* Timing: Clocks
*************************/
int fosa_clock_get_time(fosa_clock_id_t clockid,
- struct timespec *current_time)
+ struct timespec *current_time)
{
return clock_gettime(clockid, current_time);
}
int fosa_thread_get_cputime_clock(fosa_thread_id_t tid,
- fosa_clock_id_t *clockid)
+ fosa_clock_id_t *clockid)
{
if (tid.linux_pid == tid.linux_tid) {
- /* we're in a standard UNIX process */
+ /* standard UNIX process */
*clockid = FOSA_CLOCK_REALTIME;
-
return 0;
} else
- /* we're in a thread */
+ /* POSIX thread */
return pthread_getcpuclockid(tid.pthread_id, clockid);
}
* Timing: Timers
*************************/
+/**
+ * fosa_create_timer()
+ *
+ * Create a one-shot timer
+ *
+ * This function creates a timer based on the clock specified by clock,
+ * and associates to this timer a notification mechanism consisting of
+ * a signal and associated information. Initially, the timer is in the
+ * disarmed state, i.e., not counting time. It can be armed to start
+ * counting time with fosa_timer_arm().
+ *
+ * The function stores the identifier of the newly created timer in the
+ * variable pointed to by timerid.
+ *
+ * When the timer expires, the signal number specified by signal will be
+ * sent together with the information specified by info, to the thread
+ * that armed the timer (@see fosa_timer_arm()).
+ *
+ * Note that, since this is a POSIX implementation, the signal will be sent
+ * to any thread waiting fot it (in a given UNIX process).
+ * No signal-waiting thread or similar strategy is implemented, the specific
+ * thread can be choosed (for example) by means of the signal number.
+ *
+ * Returns 0 if successful; otherwise it returns an error code:
+ * EINVAL: the value of clockid or signal is invalid
+ *
+ * EAGAIN: the system lacks enough resources to create the timer
+ **/
int fosa_timer_create(fosa_clock_id_t clockid,
- fosa_signal_t signal,
- fosa_signal_info_t info,
- fosa_timer_id_t *timerid)
+ fosa_signal_t signal,
+ fosa_signal_info_t info,
+ fosa_timer_id_t *timerid)
{
struct sigevent event;
event.sigev_notify = SIGEV_SIGNAL;
event.sigev_signo = signal;
- event.sigev_value.sival_int = info.sival_int;
+ //event.sigev_value.sival_int = info.sival_int;
+ event.sigev_value = *((union sigval*) &info);
return timer_create(clockid, &event, timerid);
}
-int fosa_timer_delete(fosa_timer_id_t timerid){
- timer_delete(timerid);
- return 0;
+/**
+ * fosa_timer_create_with_receiver()
+ *
+ * Create a one-shot timer with a specific signal receiver thread
+ *
+ * This function creates a timer in the same way as fosa_timer_create,
+ * except that the signal generated when the timer expires is sent to
+ * the thread specified by receiver
+ *
+ * In this implementation, since in POSIX we can not specify a receiver,
+ * always returns ENOSYS.
+ *
+ * You have to use the "simple" fosa_timer_create.
+ **/
+ int fosa_timer_create_with_receiver(fosa_clock_id_t clockid,
+ fosa_signal_t signal,
+ fosa_signal_info_t info,
+ fosa_timer_id_t *timerid,
+ fosa_thread_id_t receiver)
+{
+ /* in POSIX the receiver thread cannot be specified!! */
+ //return fosa_timer_create(clockid, signal, info, timerid);
+ return ENOSYS;
+}
+
+ /**
+ * Delete a timer
+ *
+ * The function deletes the timer specified by timerid, which becomes
+ * unusable. If the timer was armed, it is automatically disarmed before
+ * deletion.
+ *
+ * Returns 0 if successful; otherwise it returns an error code:
+ * EINVAL: the value of timerid is not valid
+ **/
+int fosa_timer_delete(fosa_timer_id_t timerid)
+{
+ return timer_delete(timerid);
}
+/**
+ * fosa_timer_arm()
+ *
+ * Arm a timer
+ *
+ * The timer specified by timer is armed and starts counting time.
+ *
+ * If abstime is true, the value pointed to by value is the absolute
+ * time at which the timer will expire. If value specifies a time instant
+ * in the past, the timer expires immediately.
+ *
+ * If abstime is false, the value pointed to by value is the relative interval
+ * that must elapse for the timer to expire.
+ *
+ * In both cases, absolute or relative, the time is measured with the clock
+ * associated with the timer when it was created.
+ *
+ * If the timer was already armed, the previous time or interval is discarded
+ * and the timer is rearmed with the new value.
+ *
+ * When the timer expires, it is disarmed.
+ *
+ * Returns 0 if successful; otherwise it returns an error code:
+ * EINVAL: the value of timerid or value is invalid
+ **/
int fosa_timer_arm (fosa_timer_id_t timerid,
- bool abstime,
- const struct timespec *value)
+ bool abstime,
+ const struct timespec *value)
{
- int flags;
struct itimerspec when;
- when.it_value = *value; /* one shot timer */
+ /* non-periodic one shot timer configuration */
+ when.it_value = *value;
when.it_interval.tv_sec = 0;
- when.it_interval.tv_nsec = 0; /* no periodic behaviour */
- if (abstime)
- flags = TIMER_ABSTIME;
- else
- flags = 0;
+ when.it_interval.tv_nsec = 0;
- return timer_settime(timerid, flags, &when, NULL);
+ return timer_settime(timerid,
+ (abstime ? TIMER_ABSTIME : 0),
+ &when,
+ NULL);
}
-int fosa_timer_get_remaining_time(fosa_timer_id_t timerid, struct timespec *remaining_time)
+/**
+ * fosa_timer_get_remaining_time()
+ *
+ * Get the remaining time for timer expiration
+ *
+ * Returns the relative remaining time for timer expiration. If the
+ * clock is a CPU clock it returns the time as if the thread was
+ * executing constantly.
+ *
+ * If the timer is disarmed it returns 0.
+ *
+ * Returns 0 if successful; otherwise it returns an error code:
+ * EINVAL: the value of timerid or value is invalid
+ **/
+int fosa_timer_get_remaining_time(fosa_timer_id_t timerid,
+ struct timespec *remaining_time)
{
- errno = EINVAL;
- return -1;
+ int error;
+ struct itimerspec time;
+
+ if (remaining_time != NULL) {
+ if ((error = timer_gettime(timerid, &time)) == -1)
+ return error;
+
+ *remaining_time = time.it_value;
+ } else
+ return EINVAL;
+
+ return 0;
}
-int fosa_timer_disarm(fosa_timer_id_t timerid, struct timespec *remaining_time)
+/**
+ * fosa_timer_disarm()
+ *
+ * Disarm a timer
+ *
+ * The timer specified by timer is disarmed, and will not expire unless
+ * it is rearmed. If the timer was already disramed, the function has
+ * no effect.
+ *
+ * If the pointer remaining_time is != NULL, the remaining time before
+ * expiration will be returned in that pointer. If the timer was
+ * disarmed a 0 value will be set.
+ *
+ * Returns 0 if successful; otherwise it returns an error code:
+ * EINVAL: the value of timerid or value is invalid
+ **/
+int fosa_timer_disarm(fosa_timer_id_t timerid,
+ struct timespec *remaining_time)
{
- struct itimerspec when;
+ int error;
+ struct itimerspec time;
+
+ if (remaining_time != NULL) {
+ if ((error = timer_gettime(timerid, &time)) == -1)
+ return error;
+
+ *remaining_time = time.it_value;
+ }
- /* maybe not needed but safer */
- when.it_value.tv_sec = 0;
- when.it_value.tv_nsec = 0;
- when.it_interval = when.it_value;
+ time.it_value.tv_sec = 0;
+ time.it_value.tv_nsec = 0;
- return timer_settime(timerid, TIMER_ABSTIME , &when, NULL);
+ return timer_settime(timerid, 0, &time, NULL);
}
projects / frescor / fosa.git / blobdiff