/*

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%                         W   W   AAA   N   N  DDDD                           %

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%                                                                             %

%                         MagickWand Support Methods                          %

%                                                                             %

%                              Software Design                                %

%                                   Cristy                                    %

%                                  May 2004                                   %

%                                                                             %

%                                                                             %

%  Copyright @ 1999 ImageMagick Studio LLC, a non-profit organization         %

%  dedicated to making software imaging solutions freely available.           %

%                                                                             %

%  You may not use this file except in compliance with the License.  You may  %

%  obtain a copy of the License at                                            %

%                                                                             %

%    https://imagemagick.org/license/                                         %

%                                                                             %

%  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.                                             %

%                                                                             %

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

% Assign unique ID's to each magick wand.  We store the ID's in a splay-tree

% to track which ID's persist and which were destroyed.

%

%

*/

/*

  Include declarations.

*/

#include "MagickWand/studio.h"

#include "MagickWand/MagickWand.h"

#include "MagickWand/magick-wand-private.h"

#include "MagickWand/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.

%

%  The format of the AcquireWandId() method is:

%

%      size_t AcquireWandId()

%

*/

WandExport size_t AcquireWandId(void)

{

  MagickAddressType

    wand_id;

  static size_t

    id = 0;

  if (wand_semaphore == (SemaphoreInfo *) NULL)

    ActivateSemaphoreInfo(&wand_semaphore);

  LockSemaphoreInfo(wand_semaphore);

  if (wand_ids == (SplayTreeInfo *) NULL)

    wand_ids=NewSplayTree((int (*)(const void *,const void *)) NULL,

      (void *(*)(void *)) NULL,(void *(*)(void *)) NULL);

  wand_id=id++;

  (void) AddValueToSplayTree(wand_ids,(const void *) wand_id,(const void *)

    wand_id);

  instantiate_wand=MagickTrue;

  UnlockSemaphoreInfo(wand_semaphore);

  return((size_t) wand_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.

%

%  The format of the DestroyWandIds() method is:

%

%      void DestroyWandIds(void)

%

%  A description of each parameter follows:

%

*/

WandExport void DestroyWandIds(void)

{

  if (wand_semaphore == (SemaphoreInfo *) NULL)

    ActivateSemaphoreInfo(&wand_semaphore);

  LockSemaphoreInfo(wand_semaphore);

  if (wand_ids != (SplayTreeInfo *) NULL)

    wand_ids=DestroySplayTree(wand_ids);

  instantiate_wand=MagickFalse;

  UnlockSemaphoreInfo(wand_semaphore);

  RelinquishSemaphoreInfo(&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.

%

%  The format of the RelinquishWandId() method is:

%

%      void RelinquishWandId(const size_t *id)

%

%  A description of each parameter follows:

%

%    o id: a unique wand id.

%

*/

WandExport void RelinquishWandId(const size_t id)

{

  MagickAddressType

    wand_id = (MagickAddressType) id;

  LockSemaphoreInfo(wand_semaphore);

  if (wand_ids != (SplayTreeInfo *) NULL)

    (void) DeleteNodeFromSplayTree(wand_ids,(const void *) wand_id);

  UnlockSemaphoreInfo(wand_semaphore);

}