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