339 lines
7.5 KiB
C
339 lines
7.5 KiB
C
/****************************************************************************
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*
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* $Archive: S:/STURGEON/SRC/CALLCONT/VCS/Hangman.c_v $
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*
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* INTEL Corporation Prorietary Information
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*
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* This listing is supplied under the terms of a license agreement
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* with INTEL Corporation and may not be copied nor disclosed except
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* in accordance with the terms of that agreement.
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*
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* Copyright (c) 1993-1994 Intel Corporation.
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*
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* $Revision: 1.16 $
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* $Date: 22 Jan 1997 14:55:52 $
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* $Author: MANDREWS $
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*
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* Deliverable:
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*
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* Abstract:
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*
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*
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* Notes:
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*
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***************************************************************************/
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#include "precomp.h"
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#include "apierror.h"
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#include "incommon.h"
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#include "callcont.h"
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#include "q931.h"
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#include "ccmain.h"
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#include "ccutils.h"
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#include "hangman.h"
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static BOOL bHangupInited = FALSE;
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static struct {
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PHANGUP pHead;
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LOCK Lock;
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} HangupTable;
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static struct {
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HHANGUP hHangup;
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LOCK Lock;
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} HangupHandle;
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HRESULT InitHangupManager()
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{
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ASSERT(bHangupInited == FALSE);
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HangupTable.pHead = NULL;
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InitializeLock(&HangupTable.Lock);
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HangupHandle.hHangup = CC_INVALID_HANDLE + 1;
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InitializeLock(&HangupHandle.Lock);
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bHangupInited = TRUE;
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return CC_OK;
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}
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HRESULT DeInitHangupManager()
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{
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PHANGUP pHangup;
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PHANGUP pNextHangup;
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if (bHangupInited == FALSE)
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return CC_OK;
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pHangup = HangupTable.pHead;
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while (pHangup != NULL) {
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AcquireLock(&pHangup->Lock);
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pNextHangup = pHangup->pNextInTable;
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FreeHangup(pHangup);
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pHangup = pNextHangup;
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}
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DeleteLock(&HangupHandle.Lock);
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DeleteLock(&HangupTable.Lock);
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bHangupInited = FALSE;
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return CC_OK;
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}
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HRESULT _AddHangupToTable( PHANGUP pHangup)
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{
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ASSERT(pHangup != NULL);
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ASSERT(pHangup->hHangup != CC_INVALID_HANDLE);
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ASSERT(pHangup->bInTable == FALSE);
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AcquireLock(&HangupTable.Lock);
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pHangup->pNextInTable = HangupTable.pHead;
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pHangup->pPrevInTable = NULL;
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if (HangupTable.pHead != NULL)
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HangupTable.pHead->pPrevInTable = pHangup;
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HangupTable.pHead = pHangup;
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pHangup->bInTable = TRUE;
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RelinquishLock(&HangupTable.Lock);
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return CC_OK;
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}
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HRESULT _RemoveHangupFromTable( PHANGUP pHangup)
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{
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HHANGUP hHangup;
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BOOL bTimedOut;
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ASSERT(pHangup != NULL);
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ASSERT(pHangup->bInTable == TRUE);
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// Caller must have a lock on the hangup object;
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// in order to avoid deadlock, we must:
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// 1. unlock the hangup object,
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// 2. lock the HangupTable,
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// 3. locate the hangup object in the HangupTable (note that
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// after step 2, the hangup object may be deleted from the
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// HangupTable by another thread),
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// 4. lock the hangup object (someone else may have the lock)
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// 5. remove the hangup object from the HangupTable,
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// 6. unlock the HangupTable
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//
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// The caller can now safely unlock and destroy the hangup object,
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// since no other thread will be able to find the object (its been
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// removed from the HangupTable), and therefore no other thread will
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// be able to lock it.
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// Save the hangup handle; its the only way to look up
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// the hangup object in the HangupTable. Note that we
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// can't use pHangup to find the hangup object, since
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// pHangup may be free'd up, and another hangup object
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// allocated at the same address
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hHangup = pHangup->hHangup;
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// step 1
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RelinquishLock(&pHangup->Lock);
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step2:
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// step 2
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AcquireLock(&HangupTable.Lock);
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// step 3
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pHangup = HangupTable.pHead;
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while ((pHangup != NULL) && (pHangup->hHangup != hHangup))
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pHangup = pHangup->pNextInTable;
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if (pHangup != NULL) {
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// step 4
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AcquireTimedLock(&pHangup->Lock,10,&bTimedOut);
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if (bTimedOut) {
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RelinquishLock(&HangupTable.Lock);
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Sleep(0);
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goto step2;
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}
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// step 5
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if (pHangup->pPrevInTable == NULL)
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HangupTable.pHead = pHangup->pNextInTable;
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else
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pHangup->pPrevInTable->pNextInTable = pHangup->pNextInTable;
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if (pHangup->pNextInTable != NULL)
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pHangup->pNextInTable->pPrevInTable = pHangup->pPrevInTable;
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pHangup->pNextInTable = NULL;
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pHangup->pPrevInTable = NULL;
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pHangup->bInTable = FALSE;
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}
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// step 6
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RelinquishLock(&HangupTable.Lock);
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if (pHangup == NULL)
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return CC_BAD_PARAM;
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else
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return CC_OK;
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}
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HRESULT _MakeHangupHandle( PHHANGUP phHangup)
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{
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AcquireLock(&HangupHandle.Lock);
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*phHangup = HangupHandle.hHangup++;
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RelinquishLock(&HangupHandle.Lock);
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return CC_OK;
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}
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HRESULT AllocAndLockHangup( PHHANGUP phHangup,
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CC_HCONFERENCE hConference,
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DWORD_PTR dwUserToken,
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PPHANGUP ppHangup)
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{
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HRESULT status;
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ASSERT(bHangupInited == TRUE);
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// all parameters should have been validated by the caller
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ASSERT(phHangup != NULL);
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ASSERT(hConference != CC_INVALID_HANDLE);
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ASSERT(ppHangup != NULL);
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// set phHangup now, in case we encounter an error
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*phHangup = CC_INVALID_HANDLE;
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*ppHangup = (PHANGUP)MemAlloc(sizeof(HANGUP));
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if (*ppHangup == NULL)
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return CC_NO_MEMORY;
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(*ppHangup)->bInTable = FALSE;
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status = _MakeHangupHandle(&(*ppHangup)->hHangup);
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if (status != CC_OK) {
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MemFree(*ppHangup);
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return status;
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}
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(*ppHangup)->hConference = hConference;
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(*ppHangup)->wNumCalls = 0;
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(*ppHangup)->dwUserToken = dwUserToken;
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(*ppHangup)->pNextInTable = NULL;
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(*ppHangup)->pPrevInTable = NULL;
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InitializeLock(&(*ppHangup)->Lock);
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AcquireLock(&(*ppHangup)->Lock);
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*phHangup = (*ppHangup)->hHangup;
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// add the Hangup to the Hangup table
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status = _AddHangupToTable(*ppHangup);
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if (status != CC_OK)
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FreeHangup(*ppHangup);
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return status;
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}
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// Caller must have a lock on the Hangup object
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HRESULT FreeHangup( PHANGUP pHangup)
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{
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HHANGUP hHangup;
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ASSERT(pHangup != NULL);
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// caller must have a lock on the Hangup object,
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// so there's no need to re-lock it
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hHangup = pHangup->hHangup;
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if (pHangup->bInTable == TRUE)
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if (_RemoveHangupFromTable(pHangup) == CC_BAD_PARAM)
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// the Hangup object was deleted by another thread,
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// so just return CC_OK
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return CC_OK;
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// Since the hangup object has been removed from the HangupTable,
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// no other thread will be able to find the hangup object and obtain
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// a lock, so its safe to unlock the hangup object and delete it here
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RelinquishLock(&pHangup->Lock);
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DeleteLock(&pHangup->Lock);
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MemFree(pHangup);
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return CC_OK;
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}
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HRESULT LockHangup( HHANGUP hHangup,
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PPHANGUP ppHangup)
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{
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BOOL bTimedOut;
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ASSERT(hHangup != CC_INVALID_HANDLE);
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ASSERT(ppHangup != NULL);
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step1:
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AcquireLock(&HangupTable.Lock);
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*ppHangup = HangupTable.pHead;
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while ((*ppHangup != NULL) && ((*ppHangup)->hHangup != hHangup))
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*ppHangup = (*ppHangup)->pNextInTable;
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if (*ppHangup != NULL) {
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AcquireTimedLock(&(*ppHangup)->Lock,10,&bTimedOut);
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if (bTimedOut) {
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RelinquishLock(&HangupTable.Lock);
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Sleep(0);
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goto step1;
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}
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}
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RelinquishLock(&HangupTable.Lock);
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if (*ppHangup == NULL)
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return CC_BAD_PARAM;
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else
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return CC_OK;
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}
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HRESULT ValidateHangup( HHANGUP hHangup)
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{
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PHANGUP pHangup;
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ASSERT(hHangup != CC_INVALID_HANDLE);
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AcquireLock(&HangupTable.Lock);
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pHangup = HangupTable.pHead;
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while ((pHangup != NULL) && (pHangup->hHangup != hHangup))
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pHangup = pHangup->pNextInTable;
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RelinquishLock(&HangupTable.Lock);
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if (pHangup == NULL)
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return CC_BAD_PARAM;
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else
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return CC_OK;
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}
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HRESULT UnlockHangup( PHANGUP pHangup)
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{
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ASSERT(pHangup != NULL);
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RelinquishLock(&pHangup->Lock);
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return CC_OK;
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}
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