9fab85c2de
* Renamed struct timer to struct minix_timer * Renamed timer_t to minix_timer_t * Ensured all the code uses the minix_timer_t typedef * Removed ifdef around _BSD_TIMER_T * Removed include/timers.h and merged it into include/minix/timers.h * Resolved prototype conflict by renaming kernel's (re)set_timer to (re)set_kernel_timer. Change-Id: I56f0f30dfed96e1a0575d92492294cf9a06468a5
191 lines
3.2 KiB
C
191 lines
3.2 KiB
C
/*
|
|
clock.c
|
|
|
|
Copyright 1995 Philip Homburg
|
|
*/
|
|
|
|
#include "inet.h"
|
|
#include "proto.h"
|
|
#include "generic/assert.h"
|
|
#include "generic/buf.h"
|
|
#include "generic/clock.h"
|
|
|
|
THIS_FILE
|
|
|
|
int clck_call_expire;
|
|
|
|
static clock_t curr_time;
|
|
static clock_t prev_time;
|
|
static minix_timer_t *timer_chain;
|
|
static time_t next_timeout;
|
|
|
|
static void clck_fast_release(minix_timer_t *timer);
|
|
static void set_timer(void);
|
|
|
|
void clck_init()
|
|
{
|
|
clck_call_expire= 0;
|
|
curr_time= 0;
|
|
prev_time= 0;
|
|
next_timeout= 0;
|
|
timer_chain= 0;
|
|
}
|
|
|
|
time_t get_time()
|
|
{
|
|
if (!curr_time)
|
|
{
|
|
if (getticks(&curr_time) != OK)
|
|
ip_panic(("can't read clock"));
|
|
assert(curr_time >= prev_time);
|
|
}
|
|
return curr_time;
|
|
}
|
|
|
|
void set_time (tim)
|
|
clock_t tim;
|
|
{
|
|
if (!curr_time && tim >= prev_time)
|
|
{
|
|
/* Some code assumes that no time elapses while it is
|
|
* running.
|
|
*/
|
|
curr_time= tim;
|
|
}
|
|
else if (!curr_time)
|
|
{
|
|
DBLOCK(0x20, printf("set_time: new time %lu < prev_time %lu\n",
|
|
tim, prev_time));
|
|
}
|
|
}
|
|
|
|
void reset_time()
|
|
{
|
|
prev_time= curr_time;
|
|
curr_time= 0;
|
|
}
|
|
|
|
void clck_timer(timer, timeout, func, fd)
|
|
minix_timer_t *timer;
|
|
time_t timeout;
|
|
timer_func_t func;
|
|
int fd;
|
|
{
|
|
minix_timer_t *timer_index;
|
|
|
|
if (timer->tim_active)
|
|
clck_fast_release(timer);
|
|
assert(!timer->tim_active);
|
|
|
|
timer->tim_next= 0;
|
|
timer->tim_func= func;
|
|
timer->tim_ref= fd;
|
|
timer->tim_time= timeout;
|
|
timer->tim_active= 1;
|
|
|
|
if (!timer_chain)
|
|
timer_chain= timer;
|
|
else if (timeout < timer_chain->tim_time)
|
|
{
|
|
timer->tim_next= timer_chain;
|
|
timer_chain= timer;
|
|
}
|
|
else
|
|
{
|
|
timer_index= timer_chain;
|
|
while (timer_index->tim_next &&
|
|
timer_index->tim_next->tim_time < timeout)
|
|
timer_index= timer_index->tim_next;
|
|
timer->tim_next= timer_index->tim_next;
|
|
timer_index->tim_next= timer;
|
|
}
|
|
if (next_timeout == 0 || timer_chain->tim_time < next_timeout)
|
|
set_timer();
|
|
}
|
|
|
|
void clck_tick (mess)
|
|
message *mess;
|
|
{
|
|
next_timeout= 0;
|
|
set_timer();
|
|
}
|
|
|
|
static void clck_fast_release (timer)
|
|
minix_timer_t *timer;
|
|
{
|
|
minix_timer_t *timer_index;
|
|
|
|
if (!timer->tim_active)
|
|
return;
|
|
|
|
if (timer == timer_chain)
|
|
timer_chain= timer_chain->tim_next;
|
|
else
|
|
{
|
|
timer_index= timer_chain;
|
|
while (timer_index && timer_index->tim_next != timer)
|
|
timer_index= timer_index->tim_next;
|
|
assert(timer_index);
|
|
timer_index->tim_next= timer->tim_next;
|
|
}
|
|
timer->tim_active= 0;
|
|
}
|
|
|
|
static void set_timer()
|
|
{
|
|
time_t new_time;
|
|
time_t now;
|
|
|
|
if (!timer_chain)
|
|
return;
|
|
|
|
now= get_time();
|
|
new_time= timer_chain->tim_time;
|
|
if (new_time <= now)
|
|
{
|
|
clck_call_expire= 1;
|
|
return;
|
|
}
|
|
|
|
if (next_timeout == 0 || new_time < next_timeout)
|
|
{
|
|
next_timeout= new_time;
|
|
new_time -= now;
|
|
|
|
if (sys_setalarm(new_time, 0) != OK)
|
|
ip_panic(("can't set timer"));
|
|
}
|
|
}
|
|
|
|
void clck_untimer (timer)
|
|
minix_timer_t *timer;
|
|
{
|
|
clck_fast_release (timer);
|
|
set_timer();
|
|
}
|
|
|
|
void clck_expire_timers()
|
|
{
|
|
time_t now;
|
|
minix_timer_t *timer_index;
|
|
|
|
clck_call_expire= 0;
|
|
|
|
if (timer_chain == NULL)
|
|
return;
|
|
|
|
now= get_time();
|
|
while (timer_chain && timer_chain->tim_time<=now)
|
|
{
|
|
assert(timer_chain->tim_active);
|
|
timer_chain->tim_active= 0;
|
|
timer_index= timer_chain;
|
|
timer_chain= timer_chain->tim_next;
|
|
(*timer_index->tim_func)(timer_index->tim_ref, timer_index);
|
|
}
|
|
set_timer();
|
|
}
|
|
|
|
/*
|
|
* $PchId: clock.c,v 1.10 2005/06/28 14:23:40 philip Exp $
|
|
*/
|