/***
* _lock - Acquire a multi-thread lock
*
*Purpose:
*       Acquire a multi-thread lock.  If the lock has not already been
*       allocated, do so, but that is an internal CRT error, since all locks
*       should be allocated before first being acquired, either in
*       _mtinitlocks or individually in _mtinitlocknum.
*
*       Note that it is legal for a thread to aquire _EXIT_LOCK1
*       multiple times.
*
*Entry:
*       locknum = number of the lock to aquire
*
*Exit:
*
*Exceptions:
*       A failure to allocate a new lock results in a fatal _RT_LOCK error.
*
*******************************************************************************/

void __cdecl _lock (
        int locknum
        )
{

        /*
         * Create/open the lock, if necessary
         */
        if ( _locktable[locknum].lock == NULL ) {

            if ( !_mtinitlocknum(locknum) )
                _amsg_exit( _RT_LOCK );
        }

        /*
         * Enter the critical section.
         */

        EnterCriticalSection( _locktable[locknum].lock );
}

#ifdef _DEBUG

#include 
#include 
#include 
#include 
#include 

/***
*void operator delete() - delete a block in the debug heap
*
*Purpose:
*       Deletes any type of block.
*
*Entry:
*       void *pUserData - pointer to a (user portion) of memory block in the
*                         debug heap
*
*Return:
*       
*
*******************************************************************************/

void operator delete(
        void *pUserData
        )
{
        _CrtMemBlockHeader * pHead;

        RTCCALLBACK(_RTC_Free_hook, (pUserData, 0));

        if (pUserData == NULL)
            return;

        _mlock(_HEAP_LOCK);  /* block other threads */
        __TRY

            /* get a pointer to memory block header */
            pHead = pHdr(pUserData);

             /* verify block type */
            _ASSERTE(_BLOCK_TYPE_IS_VALID(pHead->nBlockUse));

            _free_dbg( pUserData, pHead->nBlockUse );

        __FINALLY
            _munlock(_HEAP_LOCK);  /* release other threads */
        __END_TRY_FINALLY

        return;
}

#endif  /* _DEBUG */