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DEFINITIONS
This source file includes following definitions.
- AcquireWandId
- DestroyWandIds
- RelinquishWandId
/*
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% W W AAA N N DDDD %
% W W A A NN N D D %
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% W W A A N N DDDD %
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% MagickWand Support Methods %
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% Software Design %
% John Cristy %
% May 2004 %
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% Copyright 1999-2011 ImageMagick Studio LLC, a non-profit organization %
% dedicated to making software imaging solutions freely available. %
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% You may not use this file except in compliance with the License. You may %
% obtain a copy of the License at %
% %
% http://www.imagemagick.org/script/license.php %
% %
% Unless required by applicable law or agreed to in writing, software %
% distributed under the License is distributed on an "AS IS" BASIS, %
% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
% See the License for the specific language governing permissions and %
% limitations under the License. %
% %
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*/
/*
Include declarations.
*/
#include "wand/studio.h"
#include "wand/MagickWand.h"
#include "wand/magick-wand-private.h"
#include "wand/wand.h"
static SplayTreeInfo
*wand_ids = (SplayTreeInfo *) NULL;
static MagickBooleanType
instantiate_wand = MagickFalse;
static SemaphoreInfo
*wand_semaphore = (SemaphoreInfo *) NULL;
/*
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% A c q u i r e W a n d I d %
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% AcquireWandId() returns a unique wand id.
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% The format of the AcquireWandId() method is:
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% size_t AcquireWandId()
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*/
WandExport size_t AcquireWandId(void)
{
static size_t
id = 0;
if (wand_semaphore == (SemaphoreInfo *) NULL)
AcquireSemaphoreInfo(&wand_semaphore);
LockSemaphoreInfo(wand_semaphore);
if ((wand_ids == (SplayTreeInfo *) NULL) && (instantiate_wand == MagickFalse))
{
wand_ids=NewSplayTree((int (*)(const void *,const void *)) NULL,
(void *(*)(void *)) NULL,(void *(*)(void *)) NULL);
instantiate_wand=MagickTrue;
}
id++;
(void) AddValueToSplayTree(wand_ids,(const void *) id,(const void *) id);
UnlockSemaphoreInfo(wand_semaphore);
return(id);
}
/*
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% D e s t r o y W a n d I d s %
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% DestroyWandIds() deallocates memory associated with the wand id's.
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% The format of the DestroyWandIds() method is:
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% void DestroyWandIds(void)
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% A description of each parameter follows:
%
*/
WandExport void DestroyWandIds(void)
{
if (wand_semaphore == (SemaphoreInfo *) NULL)
AcquireSemaphoreInfo(&wand_semaphore);
LockSemaphoreInfo(wand_semaphore);
if (wand_ids != (SplayTreeInfo *) NULL)
wand_ids=DestroySplayTree(wand_ids);
instantiate_wand=MagickFalse;
UnlockSemaphoreInfo(wand_semaphore);
DestroySemaphoreInfo(&wand_semaphore);
}
/*
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% R e l i n q u i s h W a n d I d %
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% RelinquishWandId() relinquishes a unique wand id.
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% The format of the RelinquishWandId() method is:
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% void RelinquishWandId(const size_t *id)
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% A description of each parameter follows:
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% o id: a unique wand id.
%
*/
WandExport void RelinquishWandId(const size_t id)
{
LockSemaphoreInfo(wand_semaphore);
if (wand_ids != (SplayTreeInfo *) NULL)
(void) DeleteNodeByValueFromSplayTree(wand_ids,(const void *) id);
UnlockSemaphoreInfo(wand_semaphore);
}