winedos / Make timers work without SIGALRM
Jukka Heinonen
jhei at iki.fi
Fri Jun 6 16:55:18 CDT 2003
This patch removes SIGALRM use from DOS timer emulation.
Reason for this is that both ntdll and winedos get simpler
and it is quite a lot easier to add DPMI IRQ support later
after this change. Also, at least under Linux 2.4,
timer resolution should improve significantly even though
jitter in individual timer events will be increased. This
is due to signals using jiffy boundaries while Win32 timers
use gettimeofday/poll loop. Using different Win32 primitives
it should be possible to further improve resolution and reduce
jitter.
Patch for removing SIGALRM handling from ntdll and for
replacing _TEB.alarms with _TEB.dpmi_vif (needed by DPMI
IRQ stuff) will follow if this patch gets applied.
Changelog:
Split timer code into separate source file.
Stop using SIGALRM for timers.
Index: dlls/winedos/Makefile.in
===================================================================
RCS file: /home/wine/wine/dlls/winedos/Makefile.in,v
retrieving revision 1.24
diff -u -r1.24 Makefile.in
--- dlls/winedos/Makefile.in 15 May 2003 23:25:50 -0000 1.24
+++ dlls/winedos/Makefile.in 6 Jun 2003 21:17:18 -0000
@@ -48,6 +48,7 @@
module.c \
relay.c \
soundblaster.c \
+ timer.c \
vga.c \
vxd.c \
xms.c
Index: dlls/winedos/dosvm.c
===================================================================
RCS file: /home/wine/wine/dlls/winedos/dosvm.c,v
retrieving revision 1.37
diff -u -r1.37 dosvm.c
--- dlls/winedos/dosvm.c 6 Jun 2003 18:09:14 -0000 1.37
+++ dlls/winedos/dosvm.c 6 Jun 2003 21:17:20 -0000
@@ -374,6 +374,8 @@
SetEvent( (HANDLE)msg.wParam );
}
break;
+ default:
+ DispatchMessageA(&msg);
}
}
}
@@ -423,13 +425,6 @@
IF_SET(context);
EnterCriticalSection(&qcrit);
sig_sent++;
- while (NtCurrentTeb()->alarms) {
- DOSVM_QueueEvent(0,DOS_PRIORITY_REALTIME,NULL,NULL);
- /* hmm, instead of relying on this signal counter, we should
- * probably check how many ticks have *really* passed, probably using
- * QueryPerformanceCounter() or something like that */
- InterlockedDecrement(&(NtCurrentTeb()->alarms));
- }
TRACE_(int)("context=%p\n", context);
TRACE_(int)("cs:ip=%04lx:%04lx, ss:sp=%04lx:%04lx\n", context->SegCs, context->Eip, context->SegSs, context->Esp);
if (!ISV86(context)) {
@@ -493,40 +488,6 @@
}
}
-/***********************************************************************
- * SetTimer (WINEDOS.@)
- */
-void WINAPI DOSVM_SetTimer( UINT ticks )
-{
- struct itimerval tim;
-
- if (dosvm_pid) {
- /* the PC clocks ticks at 1193180 Hz */
- tim.it_interval.tv_sec=0;
- tim.it_interval.tv_usec=MulDiv(ticks,1000000,1193180);
- /* sanity check */
- if (!tim.it_interval.tv_usec) tim.it_interval.tv_usec=1;
- /* first tick value */
- tim.it_value = tim.it_interval;
- TRACE_(int)("setting timer tick delay to %ld us\n", tim.it_interval.tv_usec);
- setitimer(ITIMER_REAL, &tim, NULL);
- }
-}
-
-/***********************************************************************
- * GetTimer (WINEDOS.@)
- */
-UINT WINAPI DOSVM_GetTimer( void )
-{
- struct itimerval tim;
-
- if (dosvm_pid) {
- getitimer(ITIMER_REAL, &tim);
- return MulDiv(tim.it_value.tv_usec,1193180,1000000);
- }
- return 0;
-}
-
#else /* !MZ_SUPPORTED */
/***********************************************************************
@@ -547,16 +508,6 @@
* OutPIC (WINEDOS.@)
*/
void WINAPI DOSVM_PIC_ioport_out( WORD port, BYTE val) {}
-
-/***********************************************************************
- * SetTimer (WINEDOS.@)
- */
-void WINAPI DOSVM_SetTimer( UINT ticks ) {}
-
-/***********************************************************************
- * GetTimer (WINEDOS.@)
- */
-UINT WINAPI DOSVM_GetTimer( void ) { return 0; }
/***********************************************************************
* QueueEvent (WINEDOS.@)
--- /dev/null Thu Jan 1 02:00:00 1970
+++ dlls/winedos/timer.c Sat Jun 7 00:14:06 2003
@@ -0,0 +1,126 @@
+/*
+ * 8253/8254 Programmable Interval Timer (PIT) emulation
+ *
+ * Copyright 2003 Jukka Heinonen
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "config.h"
+
+#include "dosexe.h"
+#include "wine/debug.h"
+#include "wingdi.h"
+#include "winuser.h"
+
+WINE_DEFAULT_DEBUG_CHANNEL(int);
+
+/*
+ * FIXME: Move timer ioport handling here and remove
+ * Dosvm.GetTimer/Dosvm.SetTimer.
+ * FIXME: Use QueryPerformanceCounter for
+ * more precise GetTimer implementation.
+ * FIXME: Use QueryPerformanceCounter (or GetTimer implementation)
+ * in timer tick routine to compensate for lost ticks.
+ * This should also make it possible to
+ * emulate really fast timers.
+ * FIXME: Support special timer modes in addition to periodic mode.
+ * FIXME: Make sure that there are only limited number
+ * of pending timer IRQ events queued. This makes sure that
+ * timer handling does not eat all available memory even
+ * if IRQ handling stops for some reason (suspended process?).
+ * This is easy to do by using DOSRELAY parameter.
+ * FIXME: Use timeSetEvent, NtSetEvent or timer thread for more precise
+ * timing.
+ * FIXME: Move Win16 timer emulation code here.
+ */
+
+/* The PC clocks ticks at 1193180 Hz. */
+#define TIMER_FREQ 1193180
+
+/* Unique system timer identifier. */
+static UINT_PTR TIMER_id = 0;
+
+/* Time when timer IRQ was last queued. */
+static DWORD TIMER_stamp = 0;
+
+/* Timer ticks between timer IRQs. */
+static UINT TIMER_ticks = 0;
+
+
+/***********************************************************************
+ * TIMER_TimerProc
+ */
+static void CALLBACK TIMER_TimerProc( HWND hwnd,
+ UINT uMsg,
+ UINT_PTR idEvent,
+ DWORD dwTime )
+{
+ TIMER_stamp = dwTime;
+ DOSVM_QueueEvent( 0, DOS_PRIORITY_REALTIME, NULL, NULL );
+}
+
+
+/***********************************************************************
+ * TIMER_DoSetTimer
+ */
+static void WINAPI TIMER_DoSetTimer( ULONG_PTR arg )
+{
+ INT millis = MulDiv( arg, 1000, TIMER_FREQ );
+
+ /* sanity check - too fast timer */
+ if (millis < 1)
+ millis = 1;
+
+ TRACE_(int)( "setting timer tick delay to %d ms\n", millis );
+
+ if (TIMER_id)
+ KillTimer( NULL, TIMER_id );
+
+ TIMER_id = SetTimer( NULL, 0, millis, TIMER_TimerProc );
+ TIMER_stamp = GetTickCount();
+ TIMER_ticks = arg;
+}
+
+
+/***********************************************************************
+ * GetTimer (WINEDOS.@)
+ */
+UINT WINAPI DOSVM_GetTimer( void )
+{
+ if (!DOSVM_IsWin16())
+ {
+ DWORD millis = GetTickCount() - TIMER_stamp;
+ INT ticks = MulDiv( millis, TIMER_FREQ, 1000 );
+
+ /* sanity check - tick wrap or suspended process or update race */
+ if (ticks < 0 || ticks >= TIMER_ticks)
+ ticks = 0;
+
+ return ticks;
+ }
+
+ return 0;
+}
+
+
+/***********************************************************************
+ * SetTimer (WINEDOS.@)
+ */
+void WINAPI DOSVM_SetTimer( UINT ticks )
+{
+ if (!DOSVM_IsWin16())
+ MZ_RunInThread( TIMER_DoSetTimer, ticks );
+}
--
Jukka Heinonen <http://www.iki.fi/jhei/>
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