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  she says so in writing.  Refer to the Aladdin Free Public License (the
  "License") for full details.
  
  Every copy of AFPL Ghostscript must include a copy of the License, normally
  in a plain ASCII text file named PUBLIC.  The License grants you the right
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*/

/*$Id: gsmemlok.h,v 1.2 2000/09/19 19:00:29 lpd Exp $ */
/* Interface to monitor-locked heap memory allocator */

/* Initial version 2/1/98 by John Desrosiers (soho@crl.com) */

#if !defined(gsmemlok_INCLUDED)
#  define gsmemlok_INCLUDED

#include "gsmemory.h"
#include "gxsync.h"

/*
 * This allocator encapsulates another allocator with a mutex.
 * Note that it does not keep track of memory that it acquires:
 * thus free_all with FREE_ALL_DATA is a no-op.
 */

typedef struct gs_memory_locked_s {
    gs_memory_common;		/* interface outside world sees */
    gs_memory_t *target;	/* allocator to front */
    gx_monitor_t *monitor;	/* monitor to serialize access to functions */
} gs_memory_locked_t;

/* ---------- Public constructors/destructors ---------- */

/* Initialize a locked memory manager. */
int gs_memory_locked_init(P2(
			     gs_memory_locked_t * lmem,	/* allocator to init */
			     gs_memory_t * target	/* allocator to monitor lock */
			     ));

/* Release a locked memory manager. */
/* Note that this has no effect on the target. */
void gs_memory_locked_release(P1(gs_memory_locked_t *lmem));

/* Get the target of a locked memory manager. */
gs_memory_t * gs_memory_locked_target(P1(const gs_memory_locked_t *lmem));

#endif /*!defined(gsmemlok_INCLUDED) */