275 lines
8.9 KiB
C
275 lines
8.9 KiB
C
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/*****************************Module*Header*******************************\
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* Module Name: local.c *
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* *
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* Support routines for client side objects. *
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* *
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* Created: 30-May-1991 21:55:57 *
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* Author: Charles Whitmer [chuckwh] *
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* *
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* Copyright (c) 1991,1993 Microsoft Corporation *
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\**************************************************************************/
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#include "precomp.h"
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#pragma hdrstop
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#include <ntcsrdll.h>
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LHE *pLocalTable; // Points to handle table.
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ULONG iFreeLhe = INVALID_INDEX; // Identifies a free handle index.
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ULONG cLheCommitted = 0; // Count of LHEs with committed RAM.
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CRITICAL_SECTION semLocal; // Semaphore for handle allocation.
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//XXX Useless but needed by csrgdi.h
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#if DBG
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ULONG gcHits = 0;
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ULONG gcBatch = 0;
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ULONG gcCache = 0;
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ULONG gcUser = 0;
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#endif
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/******************************Private*Routine*****************************\
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* bMakeMoreHandles () *
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* *
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* Commits more RAM to the local handle table and links the new free *
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* handles together. Returns TRUE on success, FALSE on error. *
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* *
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* History: *
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* Sat 01-Jun-1991 17:06:45 -by- Charles Whitmer [chuckwh] *
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* Wrote it. *
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\**************************************************************************/
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BOOL bMakeMoreHandles()
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{
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UINT ii;
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// Commit more RAM for the handle table.
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if (
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(cLheCommitted >= MAX_HANDLES) ||
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(VirtualAlloc(
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(LPVOID) &pLocalTable[cLheCommitted],
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COMMIT_COUNT * sizeof(LHE),
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MEM_COMMIT,
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PAGE_READWRITE
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) == (LPVOID) NULL)
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)
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{
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WARNING("bMakeMoreHandles(): failed to commit more memory\n");
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SetLastError(ERROR_NOT_ENOUGH_MEMORY);
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return(FALSE);
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}
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// Initialize the new handles.
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ii = iFreeLhe = cLheCommitted;
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cLheCommitted += COMMIT_COUNT;
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for (; ii<cLheCommitted; ii++)
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{
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pLocalTable[ii].metalink = ii+1;
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pLocalTable[ii].iUniq = 1;
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pLocalTable[ii].iType = LO_NULL;
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}
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pLocalTable[ii-1].metalink = INVALID_INDEX;
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return(TRUE);
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}
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/******************************Public*Routine******************************\
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* iAllocHandle (iType,hgre,pv) *
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* *
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* Allocates a handle from the local handle table, initializes fields in *
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* the handle entry. Returns the handle index or INVALID_INDEX on error. *
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* *
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* History: *
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* Sat 01-Jun-1991 17:08:54 -by- Charles Whitmer [chuckwh] *
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* Wrote it. *
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\**************************************************************************/
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ULONG iAllocHandle(ULONG iType,ULONG hgre,PVOID pv)
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{
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ULONG ii = INVALID_INDEX;
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PLHE plhe;
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// Get critical for handle allocation.
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ENTERCRITICALSECTION(&semLocal);
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// Make sure a handle is available.
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if (iFreeLhe != INVALID_INDEX || bMakeMoreHandles())
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{
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ii = iFreeLhe;
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plhe = pLocalTable + ii;
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iFreeLhe = plhe->metalink;
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plhe->hgre = hgre;
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plhe->cRef = 0;
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plhe->iType = (BYTE) iType;
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plhe->pv = pv;
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plhe->metalink = 0;
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plhe->tidOwner = 0;
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plhe->cLock = 0;
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}
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// Leave the critical section.
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LEAVECRITICALSECTION(&semLocal);
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return(ii);
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}
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/******************************Public*Routine******************************\
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* vFreeHandle (h) *
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* *
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* Frees up a local handle. The handle is added to the free list. This *
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* may be called with either an index or handle. The iUniq count is *
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* updated so the next user of this handle slot will have a different *
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* handle. *
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* *
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* Note for client side implementation: *
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* Caller should have handle locked before calling this. *
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* *
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* History: *
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* Sat 01-Jun-1991 17:11:23 -by- Charles Whitmer [chuckwh] *
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* Wrote it. *
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\**************************************************************************/
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VOID vFreeHandle(ULONG_PTR h)
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{
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// Extract the index from the handle.
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UINT ii = MASKINDEX(h);
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// Get critical for handle deallocation.
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ENTERCRITICALSECTION(&semLocal);
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// Caller should lock handle before freeing.
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ASSERTOPENGL(pLocalTable[ii].cLock == 1,
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"vFreeHandle(): cLock != 1\n");
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ASSERTOPENGL(pLocalTable[ii].tidOwner == GetCurrentThreadId(),
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"vFreeHandle(): thread not owner\n");
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// Add the handle to the free list.
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pLocalTable[ii].metalink = iFreeLhe;
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iFreeLhe = ii;
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// Increment the iUniq count.
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pLocalTable[ii].iUniq++;
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if (pLocalTable[ii].iUniq == 0)
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pLocalTable[ii].iUniq = 1;
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pLocalTable[ii].iType = LO_NULL;
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// Leave the critical section.
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LEAVECRITICALSECTION(&semLocal);
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}
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/******************************Public*Routine******************************\
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* cLockHandle (h)
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*
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* Lock handle for access by a thread. If another thread possesses the lock,
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* this will fail.
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*
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* Returns:
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* Lock count. Returns -1 if failure.
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*
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* History:
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* 31-Jan-1995 -by- Gilman Wong [gilmanw]
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* Wrote it.
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\**************************************************************************/
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LONG cLockHandle(ULONG_PTR h)
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{
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LONG lRet = -1;
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// Extract the index from the handle.
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UINT ii = MASKINDEX(h);
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PLHE plhe = pLocalTable + ii;
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// Get critical for handle locking.
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ENTERCRITICALSECTION(&semLocal);
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if ((ii >= cLheCommitted) ||
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(!MATCHUNIQ(plhe,h)) ||
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((plhe->iType != LO_RC))
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)
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{
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DBGLEVEL1(LEVEL_ERROR, "cLockHandle: invalid handle 0x%lx\n", h);
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SetLastError(ERROR_INVALID_HANDLE);
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goto cLockHandle_exit;
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}
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// If not currently locked or if current owning thread is the same,
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// do the lock.
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if ( (pLocalTable[ii].cLock == 0) ||
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(pLocalTable[ii].tidOwner == GetCurrentThreadId()) )
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{
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pLocalTable[ii].cLock++;
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pLocalTable[ii].tidOwner = GetCurrentThreadId();
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lRet = (LONG) pLocalTable[ii].cLock;
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}
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else
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{
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WARNING("cLockHandle(): current thread not owner\n");
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SetLastError(ERROR_BUSY);
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}
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// Leave the critical section.
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cLockHandle_exit:
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LEAVECRITICALSECTION(&semLocal);
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return lRet;
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}
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/******************************Public*Routine******************************\
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* vUnlockHandle (h)
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*
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* Removes a lock from the handle. Must be owned by current thread.
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*
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* Note:
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* Caller should possess the lock before this is called. This implies
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* that cLockHandle must be called and its return code must be heeded.
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*
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* History:
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* 31-Jan-1995 -by- Gilman Wong [gilmanw]
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* Wrote it.
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\**************************************************************************/
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VOID vUnlockHandle(ULONG_PTR h)
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{
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// Extract the index from the handle.
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UINT ii = MASKINDEX(h);
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// Get critical for handle deallocation.
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ENTERCRITICALSECTION(&semLocal);
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// If not currently locked or if current owning thread is the same,
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// do the lock.
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ASSERTOPENGL(pLocalTable[ii].cLock > 0,
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"vUnlockHandle(): not locked\n");
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ASSERTOPENGL(pLocalTable[ii].tidOwner == GetCurrentThreadId(),
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"vUnlockHandle(): thread not owner\n");
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if ( (pLocalTable[ii].cLock > 0) &&
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(pLocalTable[ii].tidOwner == GetCurrentThreadId()) )
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{
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pLocalTable[ii].cLock--;
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}
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// Leave the critical section.
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LEAVECRITICALSECTION(&semLocal);
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}
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