timer_get.c File Reference

#include <time.h>
#include <limits.h>
#include "trbase.h"

Include dependency graph for timer_get.c:

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Macros
#define	_POSIX_C_SOURCE   199309L

Functions
unsigned long	TR_timerGet (TR_Timer this, unsigned long *missed)

Detailed Description

Author

Georg Hopp

Copyright

Copyright © 2014 Georg Hopp

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Definition in file timer_get.c.

Macro Definition Documentation

#define _POSIX_C_SOURCE   199309L

Definition at line 23 of file timer_get.c.

Function Documentation

unsigned long TR_timerGet	(	TR_Timer	this,
		unsigned long *	missed
	)

Definition at line 31 of file timer_get.c.

References TR_TBASE_MIC, TR_TBASE_MIL, TR_TBASE_NAN, and TR_TBASE_SEC.

{
    struct timespec    now;
    unsigned long long elapsed;
    unsigned long      sec_factor;
    long               nan_factor;
    unsigned long      _missed;

    clock_gettime(CLOCK_REALTIME, &now);

    switch (this->base) {
        case TR_TBASE_NAN:
            sec_factor = 1000 * 1000 * 1000;
            break;
        case TR_TBASE_MIC:
            sec_factor = 1000 * 1000;
            break;
        default:
        case TR_TBASE_MIL:
            sec_factor = 1000;
            break;
        case TR_TBASE_SEC:
            sec_factor = 1;
            break;
    }

    nan_factor = 1000 * 1000 * 1000 / sec_factor;
    elapsed = (now.tv_sec - this->sec) * sec_factor
        + (now.tv_nsec - this->nsec) / nan_factor;

    _missed = elapsed / this->timeout;
    if (_missed) {
        this->sec  += _missed * this->timeout * sec_factor / nan_factor;
        this->nsec += _missed * this->timeout * sec_factor % nan_factor;
        if (missed) *missed = _missed;
    } else {
        if (missed) *missed = 0;
    }

    return this->timeout - (elapsed % this->timeout);
}