xref: /aoo42x/main/sal/inc/rtl/alloc.h (revision 9eab2a37)

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 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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
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 *************************************************************/



#ifndef _RTL_ALLOC_H_
#define _RTL_ALLOC_H_

#	include <sal/types.h>

#ifdef __cplusplus
extern "C" {
#endif


/** Allocate memory.
    @descr A call to this function will return NULL upon the requested
	memory size being either zero or larger than currently allocatable.

	@param  Bytes [in] memory size.
	@return pointer to allocated memory.
 */
void * SAL_CALL rtl_allocateMemory (
	sal_Size Bytes
) SAL_THROW_EXTERN_C();


/** Reallocate memory.
    @descr A call to this function with parameter 'Ptr' being NULL
	is equivalent to a rtl_allocateMemory() call.

	A call to this function with parameter 'Bytes' being 0
	is equivalent to a rtl_freeMemory() call.

	@see rtl_allocateMemory()
	@see rtl_freeMemory()

	@param  Ptr   [in] pointer to previously allocated memory.
	@param  Bytes [in] new memory size.
	@return pointer to reallocated memory. May differ from Ptr.
 */
void * SAL_CALL rtl_reallocateMemory (
	void *   Ptr,
	sal_Size Bytes
) SAL_THROW_EXTERN_C();


/** Free memory.
	@param  Ptr   [in] pointer to previously allocated memory.
	@return none. Memory is released. Ptr is invalid.
 */
void SAL_CALL rtl_freeMemory (
	void * Ptr
) SAL_THROW_EXTERN_C();


/** Allocate and zero memory.
    @descr A call to this function will return NULL upon the requested
	memory size being either zero or larger than currently allocatable.

	@param  Bytes [in] memory size.
	@return pointer to allocated and zero'ed memory.
 */
void * SAL_CALL rtl_allocateZeroMemory (
	sal_Size Bytes
) SAL_THROW_EXTERN_C();


/** Zero and free memory.
	@param  Ptr   [in] pointer to previously allocated memory.
	@param  Bytes [in] memory size.
	@return none. Memory is zero'ed and released. Ptr is invalid.
 */
void SAL_CALL rtl_freeZeroMemory (
	void *   Ptr,
	sal_Size Bytes
) SAL_THROW_EXTERN_C();


/** Opaque rtl_arena_type.
 */
typedef struct rtl_arena_st rtl_arena_type;

#define RTL_ARENA_NAME_LENGTH 31


/** rtl_arena_create()
 *
 *  @param  pName             [in] descriptive name; for debugging purposes.
 *  @param  quantum           [in] resource allocation unit / granularity; rounded up to next power of 2.
 *  @param  quantum_cache_max [in] max resources to cache; rounded up to next multiple of quantum; usually 0.
 *  @param  source_arena      [in] passed as argument to source_alloc, source_free; usually NULL.
 *  @param  source_alloc      [in] function to allocate resources; usually rtl_arena_alloc.
 *  @param  source_free       [in] function to free resources; usually rtl_arena_free.
 *  @param  nFlags            [in] flags; usually 0.
 *
 *  @return pointer to rtl_arena_type, or NULL upon failure.
 *
 *  @see rtl_arena_destroy()
 */
rtl_arena_type *
SAL_CALL rtl_arena_create (
    const char *       pName,
    sal_Size           quantum,
    sal_Size           quantum_cache_max,
    rtl_arena_type *   source_arena,
    void * (SAL_CALL * source_alloc)(rtl_arena_type *, sal_Size *),
    void   (SAL_CALL * source_free) (rtl_arena_type *, void *, sal_Size),
    int                nFlags
) SAL_THROW_EXTERN_C();


/** rtl_arena_destroy()
 *
 *  @param  pArena [in] the arena to destroy.
 *  @return None
 *
 *  @see rtl_arena_create()
 */
void
SAL_CALL rtl_arena_destroy (
    rtl_arena_type * pArena
) SAL_THROW_EXTERN_C();


/** rtl_arena_alloc()
 *
 *  @param  pArena [in]    arena from which resource is allocated.
 *  @param  pBytes [inout] size of resource to allocate.
 *
 *  @return allocated resource, or NULL upon failure.
 *
 *  @see rtl_arena_free()
 */
void *
SAL_CALL rtl_arena_alloc (
    rtl_arena_type * pArena,
    sal_Size *       pBytes
) SAL_THROW_EXTERN_C();


/** rtl_arena_free()
 *
 *  @param  pArena [in] arena from which resource was allocated.
 *  @param  pAddr  [in] resource to free.
 *  @param  nBytes [in] size of resource.
 *
 *  @return None.
 *
 *  @see rtl_arena_alloc()
 */
void
SAL_CALL rtl_arena_free (
    rtl_arena_type * pArena,
    void *           pAddr,
    sal_Size         nBytes
) SAL_THROW_EXTERN_C();


/** Opaque rtl_cache_type.
 */
typedef struct rtl_cache_st rtl_cache_type;

#define RTL_CACHE_NAME_LENGTH 31

#define RTL_CACHE_FLAG_BULKDESTROY 1

/** rtl_cache_create()
 *
 *  @param  pName       [in] descriptive name; for debugging purposes.
 *  @param  nObjSize    [in] object size.
 *  @param  nObjAlign   [in] object alignment; usually 0 for suitable default.
 *  @param  constructor [in] object constructor callback function; returning 1 for success or 0 for failure.
 *  @param  destructor  [in] object destructor callback function.
 *  @param  reclaim     [in] reclaim callback function.
 *  @param  pUserArg    [in] opaque argument passed to callback functions.
 *  @param  nFlags      [in] flags.
 *
 *  @return pointer to rtl_cache_type, or NULL upon failure.
 *
 *  @see rtl_cache_destroy()
 */
rtl_cache_type *
SAL_CALL rtl_cache_create (
    const char *     pName,
    sal_Size         nObjSize,
    sal_Size         nObjAlign,
    int  (SAL_CALL * constructor)(void * pObj, void * pUserArg),
    void (SAL_CALL * destructor) (void * pObj, void * pUserArg),
	void (SAL_CALL * reclaim)    (void * pUserArg),
    void *           pUserArg,
    rtl_arena_type * pSource,
    int              nFlags
) SAL_THROW_EXTERN_C();


/** rtl_cache_destroy()
 *
 *  @param  pCache [in] the cache to destroy.
 *
 *  @return None.
 *
 *  @see rtl_cache_create()
 */
void
SAL_CALL rtl_cache_destroy (
    rtl_cache_type * pCache
) SAL_THROW_EXTERN_C();


/** rtl_cache_alloc()
 *
 *  @param  pCache [in] cache from which object is allocated.
 *
 *  @return pointer to allocated object, or NULL upon failure.
 */
void *
SAL_CALL rtl_cache_alloc (
    rtl_cache_type * pCache
) SAL_THROW_EXTERN_C();


/** rtl_cache_free()
 *
 *  @param  pCache [in] cache from which object was allocated.
 *  @param  pObj   [in] object to free.
 *
 *  @return None.
 *
 *  @see rtl_cache_alloc()
 */
void
SAL_CALL rtl_cache_free (
    rtl_cache_type * pCache,
    void *           pObj
) SAL_THROW_EXTERN_C();


#ifdef __cplusplus
}
#endif

#endif /*_RTL_ALLOC_H_ */