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169 lines
3.5 KiB
169 lines
3.5 KiB
/*++
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Copyright (c) 1996,1997 Microsoft Corporation
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Module Name:
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RCVPOOL.CPP
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Abstract:
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Manages pool of send descriptors.
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Author:
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Aaron Ogus (aarono)
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Environment:
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Win32/COM
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Revision History:
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Date Author Description
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====== ====== ============================================================
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12/10/96 aarono Original
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--*/
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#include <windows.h>
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#include <mmsystem.h>
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#include <dplay.h>
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#include <dplaysp.h>
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#include <dplaypr.h>
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#include "mydebug.h"
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#include "arpd.h"
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#include "arpdint.h"
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#include "macros.h"
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//
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// Receive Descriptor Management.
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//
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VOID InitRcvDescs(PPROTOCOL this)
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{
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this->pRcvDescPool=NULL;
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this->nRcvDescsAllocated=0;
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this->nRcvDescsInUse=0;
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this->nMaxRcvDescsInUse=0;
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this->fInRcvDescTick=FALSE;
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InitializeCriticalSection(&this->RcvDescLock);
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}
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VOID FiniRcvDescs(PPROTOCOL this)
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{
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PRECEIVE pReceive;
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ASSERT(this->nRcvDescsInUse==0);
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while(this->pRcvDescPool){
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pReceive=this->pRcvDescPool;
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ASSERT_SIGN(pReceive, RECEIVE_SIGN);
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this->pRcvDescPool=this->pRcvDescPool->pNext;
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DeleteCriticalSection(&pReceive->ReceiveLock);
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My_GlobalFree(pReceive);
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this->nRcvDescsAllocated--;
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}
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ASSERT(this->nRcvDescsAllocated==0);
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DeleteCriticalSection(&this->RcvDescLock);
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}
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PRECEIVE GetRcvDesc(PPROTOCOL this)
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{
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PRECEIVE pReceive;
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Lock(&this->RcvDescLock);
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if(!this->pRcvDescPool){
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Unlock(&this->RcvDescLock);
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pReceive=(PRECEIVE)My_GlobalAlloc(GMEM_FIXED, sizeof(RECEIVE)+this->m_dwSPHeaderSize);
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if(pReceive){
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SET_SIGN(pReceive,RECEIVE_SIGN);
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InitializeCriticalSection(&pReceive->ReceiveLock);
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InitBilink(&pReceive->RcvBuffList);
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}
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Lock(&this->RcvDescLock);
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if(pReceive){
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this->nRcvDescsAllocated++;
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}
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} else {
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pReceive=this->pRcvDescPool;
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ASSERT_SIGN(pReceive, RECEIVE_SIGN);
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this->pRcvDescPool=this->pRcvDescPool->pNext;
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}
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if(pReceive){
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this->nRcvDescsInUse++;
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if( this->nRcvDescsInUse > this->nMaxRcvDescsInUse ){
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this->nMaxRcvDescsInUse = this->nRcvDescsInUse;
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}
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}
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ASSERT(this->nRcvDescsAllocated >= this->nRcvDescsInUse);
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Unlock(&this->RcvDescLock);
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return pReceive;
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}
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VOID ReleaseRcvDesc(PPROTOCOL this, PRECEIVE pReceive)
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{
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Lock(&this->RcvDescLock);
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this->nRcvDescsInUse--;
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ASSERT(!(this->nRcvDescsInUse&0x80000000));
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pReceive->pNext=this->pRcvDescPool;
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this->pRcvDescPool=pReceive;
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Unlock(&this->RcvDescLock);
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}
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#if 0
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// few enough of these, that we can just let virtual memory handle it. - switched off
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VOID RcvDescTick(PPROTOCOL this)
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{
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PRECEIVE pReceive;
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#ifdef DEBUG
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LONG fLast;
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#endif
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// Adjusts Number of allocated buffers to
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// highwater mark over the last ticks.
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// Call once per delta t (around a minute).
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DEBUG_BREAK(); //TRACE all paths.
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if(!InterlockedExchange(&this->fInRcvDescTick, 1)){
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Lock(&this->RcvDescLock);
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while((this->nRcvDescsAllocated > this->nMaxRcvDescsInUse) && this->pRcvDescPool){
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pReceive=this->pRcvDescPool;
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ASSERT_SIGN(pReceive,RECEIVE_SIGN);
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this->pRcvDescPool=this->pRcvDescPool->pNext;
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Unlock(&this->RcvDescLock);
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DeleteCriticalSection(&pReceive->ReceiveLock);
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My_GlobalFree(pReceive);
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Lock(&this->RcvDescLock);
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this->nRcvDescsAllocated--;
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}
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this->nMaxRcvDescsInUse=this->nRcvDescsInUse;
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ASSERT(this->nMaxRcvDescsInUse <= this->nRcvDescsAllocated);
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Unlock(&this->RcvDescLock);
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#ifdef DEBUG
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fLast=
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#endif
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InterlockedExchange(&this->fInRcvDescTick, 0);
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#ifdef DEBUG
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ASSERT(fLast==1);
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#endif
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}
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}
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#endif
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