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The C Users' Group Library 1994 August
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wc-cdrom-cusersgrouplibrary-1994-08.iso
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vol_300
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330_03
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tskmemw.c
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1990-10-12
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/*
--- Version 2.2 90-10-12 10:33 ---
TSKMEMW.C - CTask - Memory watch operations.
CTask - a Multitasking Kernel for C
Public Domain Software written by
Thomas Wagner
Ferrari electronic Gmbh
Beusselstrasse 27
D-1000 Berlin 21
Germany
No rights reserved.
This file is new with 2.1. The memory watch related functions were moved
from tsktimer to this module.
Version 2.2 adds a create routine that does not enqueue the created
element. Separate enable and disable routines have been added in
tsktsub.c.
*/
#include "tsk.h"
#include "tsklocal.h"
#include <stdarg.h>
/*
create_memory_watch_elem
Creates a memory watch element.
*/
tlinkptr CGlobalfunc create_memory_watch_elem (tlinkptr elem, farptr address,
word mask, word compare,
byte cmpkind, farptr strucp,
byte kind, int rept, ...)
{
va_list val;
if (cmpkind < TCMP_EQ || cmpkind > TCMP_CHG)
return LNULL;
va_start (val, rept);
elem = tsk_setup_telem (elem, TYP_WATCH, strucp, kind, va_arg (val, dword));
va_end (val);
if (elem == LNULL)
return LNULL;
if (rept)
elem->flags |= TFLAG_REPEAT;
elem->elkind = (byte)(TELEM_MEM | cmpkind);
elem->elem.mem.address = address;
elem->elem.mem.mask = mask;
elem->elem.mem.compare = compare;
return elem;
}
/*
create_memory_watch
Creates a memory watch element and activates it.
Fro compatibility to previous versions only.
*/
tlinkptr CGlobalfunc create_memory_watch (tlinkptr elem, farptr address,
word mask, word compare, byte cmpkind,
farptr strucp, byte kind, int rept, ...)
{
va_list val;
va_start (val, rept);
elem = create_memory_watch_elem (elem, address, mask, compare, cmpkind,
strucp, kind, rept, va_arg (val, dword));
va_end (val);
if (elem != LNULL)
enable_watch (elem);
return elem;
}
/*
wait_memory
Delay current task until specified memory watch condition is met.
*/
int Globalfunc wait_memory (farptr address,
word mask, word compare, byte cmpkind)
{
tlinkptr elem;
tcbptr task = GLOBDATA current_task;
if (cmpkind < TCMP_EQ || cmpkind > TCMP_CHG)
return 1;
elem = &task->timerq;
elem->link.kind = TYP_WATCH;
elem->struckind = TKIND_WAKE;
elem->elkind = (byte)(TELEM_MEM | cmpkind);
elem->flags = 0;
elem->elem.mem.address = address;
elem->elem.mem.mask = mask;
elem->elem.mem.compare = compare;
tsk_cli ();
task->state = ST_DELAYED;
task->qhead = LNULL;
tsk_putqueue (&GLOBDATA watch_queue, &elem->link);
schedule ();
return (int)((dword)task->retptr);
}