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200 lines
3.8 KiB
200 lines
3.8 KiB
/*++
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Copyright (c) 1996,1997 Microsoft Corporation
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Module Name:
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SENDPOOL.C
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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
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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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// Send Descriptor Management.
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//
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PSEND pSendDescPool=NULL;
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UINT nSendDescsAllocated=0; // Number Allocated
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UINT nSendDescsInUse=0; // Number currently in use
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UINT nMaxSendDescsInUse=0; // Maximum number in use since last TICK.
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CRITICAL_SECTION SendDescLock;
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VOID InitSendDescs(VOID)
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{
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InitializeCriticalSection(&SendDescLock);
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}
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VOID FiniSendDescs(VOID)
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{
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PSEND pSend;
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ASSERT(nSendDescsInUse==0);
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while(pSendDescPool){
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pSend=pSendDescPool;
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ASSERT_SIGN(pSend, SEND_SIGN);
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pSendDescPool=pSendDescPool->pNext;
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CloseHandle(pSend->hEvent);
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DeleteCriticalSection(&pSend->SendLock);
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My_GlobalFree(pSend);
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nSendDescsAllocated--;
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}
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ASSERT(nSendDescsAllocated==0);
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DeleteCriticalSection(&SendDescLock);
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}
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PSEND GetSendDesc(VOID)
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{
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PSEND pSend;
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Lock(&SendDescLock);
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if(!pSendDescPool){
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Unlock(&SendDescLock);
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pSend=(PSEND)My_GlobalAlloc(GMEM_FIXED|GMEM_ZEROINIT, sizeof(SEND));
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if(pSend){
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if(!(pSend->hEvent=CreateEventA(NULL, FALSE, FALSE, NULL))){
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My_GlobalFree(pSend);
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goto exit;
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}
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InitBilink(&pSend->StatList);
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InitializeCriticalSection(&pSend->SendLock);
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}
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Lock(&SendDescLock);
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if(pSend){
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SET_SIGN(pSend,SEND_SIGN);
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nSendDescsAllocated++;
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}
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} else {
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pSend=pSendDescPool;
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ASSERT_SIGN(pSend, SEND_SIGN);
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pSendDescPool=pSendDescPool->pNext;
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}
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if(pSend){
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InitBilink(&pSend->TimeoutList);
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InitBilink(&pSend->m_GSendQ);
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InitBilink(&pSend->SendQ);
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nSendDescsInUse++;
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if( nSendDescsInUse > nMaxSendDescsInUse ){
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nMaxSendDescsInUse = nSendDescsInUse;
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}
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}
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ASSERT(nSendDescsAllocated >= nSendDescsInUse);
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Unlock(&SendDescLock);
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if(pSend){
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pSend->NACKMask=0;
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pSend->bCleaningUp=FALSE;
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}
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exit:
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return pSend;
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}
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VOID ReleaseSendDesc(PSEND pSend)
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{
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PSENDSTAT pStat;
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BILINK *pBilink;
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// Dump extra statistics.
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while(!EMPTY_BILINK(&pSend->StatList)){
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pBilink=pSend->StatList.next;
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pStat=CONTAINING_RECORD(pBilink, SENDSTAT, StatList);
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Delete(pBilink);
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ReleaseSendStat(pStat);
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}
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Lock(&SendDescLock);
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nSendDescsInUse--;
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ASSERT(!(nSendDescsInUse&0x80000000));
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pSend->pNext=pSendDescPool;
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pSendDescPool=pSend;
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Unlock(&SendDescLock);
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}
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#if 0
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// let virtual memory handle this. - switched out.
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LONG fInSendDescTick=0;
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VOID SendDescTick(VOID)
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{
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PSEND pSend;
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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(&fInSendDescTick, 1)){
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Lock(&SendDescLock);
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while((nSendDescsAllocated > nMaxSendDescsInUse) && pSendDescPool){
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pSend=pSendDescPool;
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ASSERT_SIGN(pSend,SEND_SIGN);
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pSendDescPool=pSendDescPool->pNext;
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Unlock(&SendDescLock);
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CloseHandle(pSend->hEvent);
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DeleteCriticalSection(&pSend->SendLock);
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My_GlobalFree(pSend);
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Lock(&SendDescLock);
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nSendDescsAllocated--;
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}
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nMaxSendDescsInUse=nSendDescsInUse;
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ASSERT(nMaxSendDescsInUse <= nSendDescsAllocated);
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Unlock(&SendDescLock);
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#ifdef DEBUG
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fLast=
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#endif
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InterlockedExchange(&fInSendDescTick, 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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