Source: ../../mrt/timer.h
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/* -*- Mode:C; c-basic-offset:4; tab-width:8; indent-tabs-mode:t -*- */
/*
* Copyright (c) 2001
* YOID Project.
* University of Southern California/Information Sciences Institute.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* $XORP: xorp/mrt/timer.h,v 1.1.1.1 2002/12/11 23:56:07 hodson Exp $
*/
#ifndef __MRT_TIMER_H__
#define __MRT_TIMER_H__
/*
* Timer implementation header file.
*/
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <syslog.h>
#include <sys/time.h>
#include <sys/param.h>
#include <ctype.h>
#include <errno.h>
#include <sys/types.h>
#include "random.h"
/*
* Constants definitions
*/
#if (!defined(TRUE)) || (!defined(FALSE))
#ifdef TRUE
#undef TRUE
#endif
#ifdef FALSE
#undef FALSE
#endif
#define FALSE (0)
#define TRUE (!FALSE)
#ifndef __cplusplus
typedef enum { true = TRUE, false = FALSE } bool;
#endif
typedef bool bool_t;
#endif /* TRUE, FALSE */
#define FOREVER 0xffffffffU
#define NO_DELAY 0
#define SECOND 1
#define MINUTE (60*SECOND)
#define HOUR (60*MINUTE)
#define DAY (24*HOUR)
#define WEEK (7*DAY)
#define MONTH (30*DAY)
#define YEAR (365*DAY)
/*
* Structures, typedefs and macros
*/
#define NOW() (¤t_time_)
#define NOW_SEC() TIMEVAL_SEC(NOW())
#define NOW_USEC() TIMEVAL_USEC(NOW())
/*
* The prototype of the timer function to call
*/
typedef void (*cfunc_t)(void *data_pointer);
/*
* The timer definition. Usually, the user code shoudn't access any
* of its fields directly, but should use the appropriate
* macros or functions instead.
*/
typedef struct mtimer_ {
struct mtimer_ *next; /* next event in the hashed list */
struct mtimer_ *prev; /* prev event in the hashed list */
struct mtimer_ **myself; /* pointer to user code's ptr to me */
struct htimer_ *curr_queue; /* pointer to current queue */
struct timeval abstime; /* absolute expiration time */
cfunc_t func; /* function to call */
void *data_pointer; /* func's data pointer (its argument)*/
} mtimer_t;
/*
* The user code should use only the macros and functions listed below
* to deal with mtimers:
*
* timers_init(void)
* timer_next_timeval(struct timeval *timeval)
*
* TIMER_NULL((mtimer_t *)mtimer_p)
* TIMER_ISSET((mtimer_t *)mtimer_p)
* TIMER_START((mtimer_t *)mtimer_p, uint32_t delay_sec,
* uint32_t delay_usec, cfunc_t func,
* (void *)data_pointer)
* XXX: the scheduled randomized time is @delay +- @delay*@random_factor
* TIMER_START_RANDOM((mtimer_t *)mtimer_p, uint32_t delay_sec,
* uint32_t delay_usec, cfunc_t func,
* (void *)data_pointer,
* (double)random_factor)
* TIMER_START_SEMAPHORE((mtimer_t *mtimer_p, uint32_t delay_sec,
* uint32_t delay_usec)
* TIMER_CANCEL((mtimer_t *)mtimer_p)
* TIMER_LEFT_SEC((mtimer_t *)mtimer_p)
* TIMER_LEFT_TIMEVAL((mtimer_t *)mtimer_p, struct timeval *timeval_diff)
* TIMER_PROCESS()
* TIMER_PROCESS_UNTIL(uint32_t abs_sec, uint32_t abs_usec)
* TIMER_PROCESS_FOREVER()
*/
#define TIMER_NULL(mtimer_p) \
do { \
(mtimer_p) = NULL; \
} while (false)
#define TIMER_ISSET(mtimer_p) ((mtimer_p) != NULL)
#define TIMER_START(mtimer_p, delay_sec, delay_usec, func, \
data_pointer) \
do { \
if (TIMER_ISSET((mtimer_p))) \
timer_cancel((mtimer_p)); \
(mtimer_p) = timer_start((delay_sec), (delay_usec), \
(func), \
(data_pointer)); \
(mtimer_p)->myself = &(mtimer_p); \
} while (false)
#define TIMER_START_RANDOM(timer, delay_sec, delay_usec, func, \
data_pointer, random_factor) \
do { \
struct timeval timer_start_random_timeval_; \
\
TIMEVAL_SET(&timer_start_random_timeval_, (delay_sec), (delay_usec)); \
TIMEVAL_RANDOM(&timer_start_random_timeval_, (random_factor)); \
TIMER_START(timer, TIMEVAL_SEC(&timer_start_random_timeval_), \
TIMEVAL_USEC(&timer_start_random_timeval_), (func), \
(data_pointer)); \
} while (false)
#define TIMER_START_SEMAPHORE(mtimer_p, delay_sec, delay_usec) \
do { \
if (TIMER_ISSET((mtimer_p))) \
timer_cancel((mtimer_p)); \
(mtimer_p) = timer_start((delay_sec), (delay_usec), \
timer_timeout_semaphore, \
&(mtimer_p)); \
(mtimer_p)->myself = &(mtimer_p); \
} while (false)
#define TIMER_CANCEL(mtimer_p) \
do { \
timer_cancel((mtimer_p)); \
TIMER_NULL((mtimer_p)); \
} while (false)
#define TIMER_LEFT_SEC(mtimer_p) \
(timer_left_sec((mtimer_p)))
#define TIMER_LEFT_TIMEVAL(mtimer_p, timeval) \
(timer_left_timeval((mtimer_p), (timeval)))
#define TIMER_PROCESS() \
do { \
struct timeval timeout_; \
\
do { \
gettimeofday(&timeout_, NULL); \
} while (timer_process_abs_event_queue(&timeout_)); \
} while (false)
#define TIMER_PROCESS_UNTIL(abs_sec, abs_usec) \
do { \
struct timeval timeout_; \
\
TIMEVAL_SET(&timeout_, (abs_sec), (abs_usec)); \
timer_process_abs_event_queue(&timeout_); \
} while (false)
#define TIMER_PROCESS_FOREVER() \
do { \
TIMER_PROCESS_UNTIL(FOREVER, 0); \
} while (false)
/*
* Convenient macros for operations on timevals.
* Taken and adapted from <sys/time.h>
*
* XXX: NOTE: The Linux and Solaris-5.5.1 code in <sys/time.h> have a comment
* that timercmp() does not work for >= or <= , but FreeBSD does
* not have this comment. However, it turned out that the Solaris
* definition of timercmp() indeed doesn't work for those two comparison.
* The FreeBSD and Linux definitions seem to be OK, and I don't see
* any reason why 'TIMEVAL_CMP()' below won't work either.
*/
#define TIMEVAL_SEC(tvp) ((uint32_t)(tvp)->tv_sec)
#define TIMEVAL_USEC(tvp) ((uint32_t)(tvp)->tv_usec)
#define TIMEVAL_CLEAR(tvp) (tvp)->tv_sec = (tvp)->tv_usec = 0
#define TIMEVAL_ISSET(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
#define TIMEVAL_SET(tvp, sec, usec) \
do { \
(tvp)->tv_sec = (sec); \
(tvp)->tv_usec = (usec); \
} while (false)
#define TIMEVAL_COPY(s, d) \
do { \
(d)->tv_sec = (s)->tv_sec; \
(d)->tv_usec = (s)->tv_usec; \
} while (false)
#define TIMEVAL_CMP(a, b, CMP) \
(((a)->tv_sec == (b)->tv_sec) ? \
((uint32_t)(a)->tv_usec CMP (uint32_t)(b)->tv_usec) : \
((uint32_t)(a)->tv_sec CMP (uint32_t)(b)->tv_sec))
#define TIMEVAL_ADD(a, b, result) \
do { \
(result)->tv_sec = (uint32_t)(a)->tv_sec + (uint32_t)(b)->tv_sec; \
(result)->tv_usec = (uint32_t)(a)->tv_usec + (uint32_t)(b)->tv_usec; \
if ((uint32_t)(result)->tv_usec >= 1000000) { \
++(result)->tv_sec; \
(result)->tv_usec -= 1000000; \
} \
} while (false)
#define TIMEVAL_INCR(result, a) TIMEVAL_ADD(a, result, result)
#define TIMEVAL_SUB(a, b, result) \
do { \
(result)->tv_sec = (uint32_t)(a)->tv_sec - (uint32_t)(b)->tv_sec; \
(result)->tv_usec = (uint32_t)(a)->tv_usec - (uint32_t)(b)->tv_usec; \
if ((signed)(result)->tv_usec < 0) { \
--(result)->tv_sec; \
(result)->tv_usec += 1000000; \
} \
} while (false)
#define TIMEVAL_DECR(result, b) TIMEVAL_SUB(result, b, result)
#define TIMEVAL_DIV(a, d, result) \
do { \
uint32_t rem_; \
\
rem_ = (uint32_t)(a)->tv_sec % (d); \
(result)->tv_sec = (uint32_t)(a)->tv_sec / (d); \
(result)->tv_usec = ((uint32_t)(a)->tv_usec + 1000000*rem_)/(d);\
} while (false)
#define TIMEVAL_MUL(a, m, result) \
do { \
(result)->tv_sec = (uint32_t)((uint32_t)(a)->tv_sec * (m)); \
(result)->tv_usec = (uint32_t)((uint32_t)(a)->tv_usec * (m)); \
(result)->tv_sec += (uint32_t)((uint32_t)(result)->tv_usec / 1000000); \
(result)->tv_usec = (uint32_t)((uint32_t)(result)->tv_usec % 1000000); \
} while (false)
#define TIMEVAL2FLOAT(t) \
((double)TIMEVAL_SEC(t) + ((double)TIMEVAL_USEC(t))/1000000.0)
#define FLOAT2TIMEVAL(f, tv) \
do { \
(tv)->tv_sec = (uint32_t)(f); \
(tv)->tv_usec = (uint32_t) \
(((double)(f) - (uint32_t)(tv)->tv_sec) \
* 1000000.0 + .0000001); \
} while(false)
/*
* Randomize 'tvp' (a pointer to 'struct timeval') with 'random_factor'
* in either direction. E.g., if 'random_factor' is 0.1, add/substract
* up to 10% to/from 'tvp'.
*/
#define TIMEVAL_RANDOM(tvp, random_factor) \
do { \
uint32_t random_sec_, random_usec_; \
struct timeval timeval_random_timeval_; \
double xsec_; \
\
if (random_factor == 0.0) \
break; \
/* Randomize by up to 'random_factor' either way */ \
random_sec_ = TIMEVAL_SEC(tvp); \
random_usec_ = TIMEVAL_USEC(tvp); \
/* Randomize */ \
xsec_ = (random_factor)*(random_sec_); \
random_sec_ = (uint32_t)(xsec_ + 0.5); \
random_usec_ = (uint32_t)((random_factor)*(random_usec_) + 0.5) \
+ (uint32_t)((xsec_ - random_sec_)*1000000); \
if ((uint32_t)random_sec_ > 0) { \
/* To make sure that random_usec didn't get negative */ \
/* and it may only happen if xsec_ was rounded up */ \
random_sec_--; \
random_usec_ += 1000000; \
} \
/* losing precision here! */ \
if (random_sec_ != 0) \
random_sec_ = RANDOM(random_sec_); \
if (random_usec_ != 0) \
random_usec_ = RANDOM(random_usec_); \
if ((uint32_t)random_usec_ >= 1000000) { \
random_sec_ += random_usec_ / 1000000; \
random_usec_ %= 1000000; \
} \
/* Assign to 'timeval_random_timeval_', then add or substract */ \
TIMEVAL_SET(&timeval_random_timeval_, random_sec_, random_usec_); \
if (RANDOM(2)) { \
/* Add */ \
TIMEVAL_ADD(&timeval_random_timeval_, (tvp), (tvp)); \
} else { \
/* Substract */ \
if (TIMEVAL_CMP((tvp), &timeval_random_timeval_, >)) \
TIMEVAL_SUB((tvp), &timeval_random_timeval_, (tvp)); \
else \
TIMEVAL_CLEAR(tvp); \
} \
} while (false)
/*
* MIN/MAX handy macros
*/
#ifndef MAX
#define MAX(a, b) (((a) >= (b))? (a) : (b))
#define MIN(a, b) (((a) <= (b))? (a) : (b))
#endif /* MAX & MIN */
#ifndef MAX_VAL_SET
#define MAX_VAL_SET(a, val) \
do { \
if ((a) < (val)) \
(a) = (val); \
} while (false)
#define MIN_VAL_SET(a, val) \
do { \
if ((a) > (val)) \
(a) = (val); \
} while (false)
#endif /* MAX_VAL_SET & MIN_VAL_SET */
/*
* Global variables
*/
extern struct timeval current_time_;
/*
* Global functions prototypes
*/
__BEGIN_DECLS
extern int timers_init(void);
extern int timers_exit(void);
extern bool_t timer_process_event_queue(struct timeval *elapsed_time);
extern bool_t timer_process_abs_event_queue(struct timeval *end_time);
extern mtimer_t *timer_start(uint32_t delay_sec,
uint32_t delay_usec,
cfunc_t func,
void *data_pointer);
extern bool_t timer_cancel(mtimer_t *mtimer);
extern uint32_t timer_next_timeval(struct timeval *timeval);
extern uint32_t timer_left_sec(mtimer_t *mtimer);
extern uint32_t timer_left_timeval(mtimer_t *mtimer,
struct timeval *timeval_diff);
extern void timer_timeout_semaphore(void *data_pointer);
__END_DECLS
#endif /* __MRT_TIMER_H__ */
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