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/*
* SYSTEM DLL routines
*
* Copyright 1996 Alexandre Julliard
*/
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <time.h>
#include <sys/time.h>
#include <sys/timeb.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "callback.h"
#include "windows.h"
#include "miscemu.h"
typedef struct
{
FARPROC16 callback; /* NULL if not in use */
INT32 rate;
INT32 ticks;
} SYSTEM_TIMER;
#define NB_SYS_TIMERS 8
#define SYS_TIMER_RATE 54925
static SYSTEM_TIMER SYS_Timers[NB_SYS_TIMERS];
static int SYS_NbTimers = 0;
static BOOL32 SYS_TimersDisabled = FALSE;
/***********************************************************************
* SYSTEM_TimerTick
*/
static void SYSTEM_TimerTick(void)
{
int i;
for (i = 0; i < NB_SYS_TIMERS; i++)
{
if (!SYS_Timers[i].callback) continue;
if ((SYS_Timers[i].ticks -= SYS_TIMER_RATE) <= 0)
{
SYS_Timers[i].ticks += SYS_Timers[i].rate;
Callbacks->CallSystemTimerProc( SYS_Timers[i].callback );
}
}
}
/**********************************************************************
* SYSTEM_StartTicks
*
* Start the system tick timer.
*/
static void SYSTEM_StartTicks(void)
{
static BOOL32 handler_installed = FALSE;
if (!handler_installed)
{
handler_installed = TRUE;
SIGNAL_SetHandler( SIGALRM, SYSTEM_TimerTick, 1 );
}
#ifndef __EMX__ /* FIXME: Time don't work... Use BIOS directly instead */
{
struct itimerval vt_timer;
vt_timer.it_interval.tv_sec = 0;
vt_timer.it_interval.tv_usec = 54929;
vt_timer.it_value = vt_timer.it_interval;
setitimer( ITIMER_REAL, &vt_timer, NULL );
}
#endif
}
/**********************************************************************
* SYSTEM_StopTicks
*
* Stop the system tick timer.
*/
static void SYSTEM_StopTicks(void)
{
#ifndef __EMX__ /* FIXME: Time don't work... Use BIOS directly instead */
struct itimerval vt_timer;
vt_timer.it_interval.tv_sec = 0;
vt_timer.it_interval.tv_usec = 0;
vt_timer.it_value = vt_timer.it_interval;
setitimer( ITIMER_REAL, &vt_timer, NULL );
#endif
}
/***********************************************************************
* InquireSystem (SYSTEM.1)
*
* Note: the function always takes 2 WORD arguments, contrary to what
* "Undocumented Windows" says.
*/
DWORD WINAPI InquireSystem( WORD code, WORD arg )
{
WORD drivetype;
switch(code)
{
case 0: /* Get timer resolution */
return SYS_TIMER_RATE;
case 1: /* Get drive type */
drivetype = GetDriveType16( arg );
return MAKELONG( drivetype, drivetype );
case 2: /* Enable one-drive logic */
fprintf( stderr, "InquireSystem(2): set single-drive %d not supported\n", arg );
return 0;
}
fprintf( stderr, "InquireSystem: unknown code %d\n", code );
return 0;
}
/***********************************************************************
* CreateSystemTimer (SYSTEM.2)
*/
WORD WINAPI CreateSystemTimer( WORD rate, FARPROC16 callback )
{
int i;
for (i = 0; i < NB_SYS_TIMERS; i++)
if (!SYS_Timers[i].callback) /* Found one */
{
SYS_Timers[i].rate = (UINT32)rate * 1000;
if (SYS_Timers[i].rate < SYS_TIMER_RATE)
SYS_Timers[i].rate = SYS_TIMER_RATE;
SYS_Timers[i].ticks = SYS_Timers[i].rate;
SYS_Timers[i].callback = callback;
if ((++SYS_NbTimers == 1) && !SYS_TimersDisabled)
SYSTEM_StartTicks();
return i + 1; /* 0 means error */
}
return 0;
}
/***********************************************************************
* KillSystemTimer (SYSTEM.3)
*
* Note: do not confuse this function with USER.182
*/
WORD WINAPI SYSTEM_KillSystemTimer( WORD timer )
{
if (!timer || (timer > NB_SYS_TIMERS)) return timer; /* Error */
SYS_Timers[timer-1].callback = NULL;
if ((!--SYS_NbTimers) && !SYS_TimersDisabled) SYSTEM_StopTicks();
return 0;
}
/***********************************************************************
* EnableSystemTimers (SYSTEM.4)
*/
void WINAPI EnableSystemTimers(void)
{
SYS_TimersDisabled = FALSE;
if (SYS_NbTimers) SYSTEM_StartTicks();
}
/***********************************************************************
* DisableSystemTimers (SYSTEM.5)
*/
void WINAPI DisableSystemTimers(void)
{
SYS_TimersDisabled = TRUE;
if (SYS_NbTimers) SYSTEM_StopTicks();
}
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