119 lines
2.7 KiB
C
119 lines
2.7 KiB
C
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/* Copyright (c) 1998 Microsoft Corporation */
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/*
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* @Doc DMusic16
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*
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* @module locks.c - Manage page-locking the code which will be accessed via callbacks from MMSYSTEM |
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*
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*/
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#include <windows.h>
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#include <mmsystem.h>
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#include "dmusic16.h"
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#include "debug.h"
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#define SINTEXT __segname("FIX_IN_TEXT")
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#define SOUTTEXT __segname("FIX_OUT_TEXT")
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#define SCOMMTEXT __segname("FIX_COMM_TEXT")
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#define SDATA __segname("_DATA")
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static VOID PASCAL NEAR
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ForcePresent(
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WORD wSegment)
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{
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LPBYTE lpb = (LPBYTE)MAKELP(wSegment, 0);
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_asm
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{
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les bx, [lpb]
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mov al, es:[bx]
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}
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}
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/* @func Page lock needed segments
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*
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*/
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VOID PASCAL
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LockCode(
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WORD wFlags) /* @parm What to lock: Any combination of: */
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/* @flag LOCK_F_INPUT | To lock the MIDI input code segments */
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/* @flag LOCK_F_OUTPUT | To lock the MIDI output code segments */
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/* @flag LOCK_F_COMMON | To lock the common code segments */
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{
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if (wFlags & LOCK_F_INPUT)
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{
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ForcePresent(SINTEXT);
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if (!GlobalSmartPageLock(SINTEXT))
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{
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DPF(0, "Could not lock input text");
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}
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}
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if (wFlags & LOCK_F_OUTPUT)
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{
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ForcePresent(SOUTTEXT);
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if (!GlobalSmartPageLock(SOUTTEXT))
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{
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DPF(0, "Could not lock output text");
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}
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}
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if (wFlags & LOCK_F_COMMON)
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{
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ForcePresent(SCOMMTEXT);
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if (!GlobalSmartPageLock(SCOMMTEXT))
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{
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DPF(0, "Could not lock common text");
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}
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ForcePresent(SDATA);
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if (!GlobalSmartPageLock(SDATA))
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{
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DPF(0, "Could not lock data segment");
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}
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}
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}
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/* @func Page unlock needed segments
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*
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* @comm
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*/
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VOID PASCAL
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UnlockCode(
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WORD wFlags) /* @parm What to unlock: Any combination of: */
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/* @flag LOCK_F_INPUT | To unlock the MIDI input code segments */
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/* @flag LOCK_F_OUTPUT | To unlock the MIDI output code segments */
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/* @flag LOCK_F_COMMON | To unlock the common code segments */
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{
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if (wFlags & LOCK_F_INPUT)
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{
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if (!GlobalSmartPageUnlock(SINTEXT))
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{
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DPF(0, "Could not unlock input text");
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}
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}
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if (wFlags & LOCK_F_OUTPUT)
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{
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if (!GlobalSmartPageUnlock(SOUTTEXT))
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{
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DPF(0, "Could not unlock output text");
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}
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}
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if (wFlags & LOCK_F_COMMON)
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{
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if (!GlobalSmartPageUnlock(SCOMMTEXT))
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{
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DPF(0, "Could not unlock common text");
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}
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if (!GlobalSmartPageUnlock(SDATA))
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{
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DPF(0, "Could not unlock data");
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}
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}
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}
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