coap_time.h

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/* coap_time.h -- Clock Handling
 *
 * Copyright (C) 2010--2013 Olaf Bergmann <bergmann@tzi.org>
 *
 * This file is part of the CoAP library libcoap. Please see
 * README for terms of use. 
 */

#ifndef _COAP_TIME_H_
#define _COAP_TIME_H_

/*
** Make sure we can call this stuff from C++.
*/
#ifdef __cplusplus
extern "C" {
#endif


#include "config.h"

#ifdef WITH_LWIP

#include <stdint.h>
#include <lwip/sys.h>

/* lwIP provides ms in sys_now */
#define COAP_TICKS_PER_SECOND 1000

typedef uint32_t coap_tick_t;

static inline void coap_ticks_impl(coap_tick_t *t)
{
    *t = sys_now();
}

static inline void coap_clock_init_impl(void)
{
}

#define coap_clock_init coap_clock_init_impl

#define coap_ticks coap_ticks_impl

#endif
#ifdef WITH_CONTIKI
#include "clock.h"

typedef clock_time_t coap_tick_t;

typedef int coap_tick_diff_t;

#define COAP_TICKS_PER_SECOND CLOCK_SECOND

extern clock_time_t clock_offset;

static inline void
contiki_clock_init_impl(void) {
  clock_init();
  clock_offset = clock_time();
}

#define coap_clock_init contiki_clock_init_impl

static inline void
contiki_ticks_impl(coap_tick_t *t) {
  *t = clock_time();
}

#define coap_ticks contiki_ticks_impl

#endif /* WITH_CONTIKI */
#ifdef WITH_POSIX
typedef unsigned int coap_tick_t; 

typedef int coap_tick_diff_t;

#define COAP_TICKS_PER_SECOND 1024

extern time_t clock_offset;
#endif /* WITH_POSIX */

#ifndef coap_clock_init
static inline void
coap_clock_init_impl(void) {
#ifdef HAVE_TIME_H
  clock_offset = time(NULL);
#else
#  ifdef __GNUC__
    /* Issue a warning when using gcc. Other prepropressors do 
     *  not seem to have a similar feature. */ 
#   warning "cannot initialize clock"
#  endif
  clock_offset = 0;
#endif
}
#define coap_clock_init coap_clock_init_impl
#endif /* coap_clock_init */

#ifndef coap_ticks
static inline void
coap_ticks_impl(coap_tick_t *t) {
#ifdef HAVE_SYS_TIME_H
  struct timeval tv;
  gettimeofday(&tv, NULL);
  *t = (tv.tv_sec - clock_offset) * COAP_TICKS_PER_SECOND 
    + (tv.tv_usec * COAP_TICKS_PER_SECOND / 1000000);
#else
#error "clock not implemented"
#endif
}
#define coap_ticks coap_ticks_impl
#endif /* coap_ticks */

static inline
int coap_time_lt(coap_tick_t a, coap_tick_t b) {
  return ((coap_tick_diff_t)(a - b)) < 0;
}

static inline
int coap_time_le(coap_tick_t a, coap_tick_t b) {
  return a == b || coap_time_lt(a,b);
}

#ifdef __cplusplus
}
#endif


#endif /* _COAP_TIME_H_ */