124 lines
2.1 KiB
C
124 lines
2.1 KiB
C
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/*++
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Copyright (c) 1997 Microsoft Corporation
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Module Name:
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BUFPOOL.C
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Abstract:
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Manages a pool of BUFFER descriptors (BUFFERS)
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16 at a time are allocated. They are not freed until
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shutdown.
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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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1/27/97 aarono Original
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--*/
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#include <windows.h>
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#include "newdpf.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 "bufpool.h"
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#include "macros.h"
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#include "mydebug.h"
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CRITICAL_SECTION BufferPoolLock;
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PBUFFER_POOL pBufferPoolList;
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PBUFFER pBufferFreeList;
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VOID InitBufferPool(VOID)
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{
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pBufferPoolList=NULL;
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pBufferFreeList=NULL;
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InitializeCriticalSection(&BufferPoolLock);
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}
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VOID FiniBufferPool(VOID)
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{
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PBUFFER_POOL pNextBufPool;
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while(pBufferPoolList){
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pNextBufPool=pBufferPoolList->pNext;
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My_GlobalFree(pBufferPoolList);
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pBufferPoolList=pNextBufPool;
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}
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DeleteCriticalSection(&BufferPoolLock);
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}
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PBUFFER GetBuffer(VOID)
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{
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PBUFFER pBuffer=NULL;
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PBUFFER_POOL pBufferPool;
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UINT i;
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Top:
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//BUGBUG: out of interest track allocated/free buffers.
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if(pBufferPoolList){
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Lock(&BufferPoolLock);
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if(pBufferFreeList){
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pBuffer=pBufferFreeList;
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pBufferFreeList=pBuffer->pNext;
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}
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Unlock(&BufferPoolLock);
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if(pBuffer){
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return pBuffer;
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}
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}
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pBufferPool=(PBUFFER_POOL)My_GlobalAlloc(GMEM_FIXED, sizeof(BUFFER_POOL));
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if(pBufferPool){
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// link the buffers into a chain.
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for(i=0;i<BUFFER_POOL_SIZE-1;i++){
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pBufferPool->Buffers[i].pNext=&pBufferPool->Buffers[i+1];
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}
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Lock(&BufferPoolLock);
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// link the pool on the pool list.
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pBufferPool->pNext=pBufferPoolList;
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pBufferPoolList=pBufferPool;
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// link the buffers on the buffer list.
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pBufferPool->Buffers[BUFFER_POOL_SIZE-1].pNext=pBufferFreeList;
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pBufferFreeList=&pBufferPool->Buffers[0];
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Unlock(&BufferPoolLock);
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goto Top;
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} else {
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ASSERT(0); //TRACE ALL PATHS
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return NULL;
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}
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}
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VOID FreeBuffer(PBUFFER pBuffer)
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{
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Lock(&BufferPoolLock);
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pBuffer->pNext=pBufferFreeList;
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pBufferFreeList=pBuffer;
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Unlock(&BufferPoolLock);
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}
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