mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-31 22:25:30 +00:00
141 lines
5.1 KiB
C
141 lines
5.1 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/*
|
|
* The contents of this file are subject to the Netscape Public License
|
|
* Version 1.0 (the "NPL"); you may not use this file except in
|
|
* compliance with the NPL. You may obtain a copy of the NPL at
|
|
* http://www.mozilla.org/NPL/
|
|
*
|
|
* Software distributed under the NPL is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
|
|
* for the specific language governing rights and limitations under the
|
|
* NPL.
|
|
*
|
|
* The Initial Developer of this code under the NPL is Netscape
|
|
* Communications Corporation. Portions created by Netscape are
|
|
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
|
|
* Reserved.
|
|
*/
|
|
|
|
/*
|
|
** File: prmem.h
|
|
** Description: API to NSPR 2.0 memory management functions
|
|
**
|
|
*/
|
|
#ifndef prmem_h___
|
|
#define prmem_h___
|
|
|
|
#include "prtypes.h"
|
|
#include <stddef.h>
|
|
#include <stdlib.h>
|
|
|
|
PR_BEGIN_EXTERN_C
|
|
|
|
/*
|
|
** Thread safe memory allocation.
|
|
**
|
|
** NOTE: pr wraps up malloc, free, calloc, realloc so they are already
|
|
** thread safe (and are not declared here - look in stdlib.h).
|
|
*/
|
|
|
|
/*
|
|
** PR_Malloc, PR_Calloc, PR_Realloc, and PR_Free have the same signatures
|
|
** as their libc equivalent malloc, calloc, realloc, and free, and have
|
|
** the same semantics. (Note that the argument type size_t is replaced
|
|
** by PRUint32.) Memory allocated by PR_Malloc, PR_Calloc, or PR_Realloc
|
|
** must be freed by PR_Free.
|
|
*/
|
|
|
|
PR_EXTERN(void *) PR_Malloc(PRUint32 size);
|
|
|
|
PR_EXTERN(void *) PR_Calloc(PRUint32 nelem, PRUint32 elsize);
|
|
|
|
PR_EXTERN(void *) PR_Realloc(void *ptr, PRUint32 size);
|
|
|
|
PR_EXTERN(void) PR_Free(void *ptr);
|
|
|
|
/*
|
|
** The following are some convenience macros defined in terms of
|
|
** PR_Malloc, PR_Calloc, PR_Realloc, and PR_Free.
|
|
*/
|
|
|
|
/***********************************************************************
|
|
** FUNCTION: PR_MALLOC()
|
|
** DESCRIPTION:
|
|
** PR_NEW() allocates an untyped item of size _size from the heap.
|
|
** INPUTS: _size: size in bytes of item to be allocated
|
|
** OUTPUTS: untyped pointer to the node allocated
|
|
** RETURN: pointer to node or error returned from malloc().
|
|
***********************************************************************/
|
|
#define PR_MALLOC(_bytes) (PR_Malloc((_bytes)))
|
|
|
|
/***********************************************************************
|
|
** FUNCTION: PR_NEW()
|
|
** DESCRIPTION:
|
|
** PR_NEW() allocates an item of type _struct from the heap.
|
|
** INPUTS: _struct: a data type
|
|
** OUTPUTS: pointer to _struct
|
|
** RETURN: pointer to _struct or error returns from malloc().
|
|
***********************************************************************/
|
|
#define PR_NEW(_struct) ((_struct *) PR_MALLOC(sizeof(_struct)))
|
|
|
|
/***********************************************************************
|
|
** FUNCTION: PR_REALLOC()
|
|
** DESCRIPTION:
|
|
** PR_REALLOC() re-allocates _ptr bytes from the heap as a _size
|
|
** untyped item.
|
|
** INPUTS: _ptr: pointer to node to reallocate
|
|
** _size: size of node to allocate
|
|
** OUTPUTS: pointer to node allocated
|
|
** RETURN: pointer to node allocated
|
|
***********************************************************************/
|
|
#define PR_REALLOC(_ptr, _size) (PR_Realloc((_ptr), (_size)))
|
|
|
|
/***********************************************************************
|
|
** FUNCTION: PR_CALLOC()
|
|
** DESCRIPTION:
|
|
** PR_CALLOC() allocates a _size bytes untyped item from the heap
|
|
** and sets the allocated memory to all 0x00.
|
|
** INPUTS: _size: size of node to allocate
|
|
** OUTPUTS: pointer to node allocated
|
|
** RETURN: pointer to node allocated
|
|
***********************************************************************/
|
|
#define PR_CALLOC(_size) (PR_Calloc(1, (_size)))
|
|
|
|
/***********************************************************************
|
|
** FUNCTION: PR_NEWZAP()
|
|
** DESCRIPTION:
|
|
** PR_NEWZAP() allocates an item of type _struct from the heap
|
|
** and sets the allocated memory to all 0x00.
|
|
** INPUTS: _struct: a data type
|
|
** OUTPUTS: pointer to _struct
|
|
** RETURN: pointer to _struct
|
|
***********************************************************************/
|
|
#define PR_NEWZAP(_struct) ((_struct*)PR_Calloc(1, sizeof(_struct)))
|
|
|
|
/***********************************************************************
|
|
** FUNCTION: PR_DELETE()
|
|
** DESCRIPTION:
|
|
** PR_DELETE() unallocates an object previosly allocated via PR_NEW()
|
|
** or PR_NEWZAP() to the heap.
|
|
** INPUTS: pointer to previously allocated object
|
|
** OUTPUTS: the referenced object is returned to the heap
|
|
** RETURN: void
|
|
***********************************************************************/
|
|
#define PR_DELETE(_ptr) { PR_Free(_ptr); (_ptr) = NULL; }
|
|
|
|
/***********************************************************************
|
|
** FUNCTION: PR_FREEIF()
|
|
** DESCRIPTION:
|
|
** PR_FREEIF() conditionally unallocates an object previously allocated
|
|
** vial PR_NEW() or PR_NEWZAP(). If the pointer to the object is
|
|
** equal to zero (0), the object is not released.
|
|
** INPUTS: pointer to previously allocated object
|
|
** OUTPUTS: the referenced object is conditionally returned to the heap
|
|
** RETURN: void
|
|
***********************************************************************/
|
|
#define PR_FREEIF(_ptr) if (_ptr) PR_DELETE(_ptr)
|
|
|
|
PR_END_EXTERN_C
|
|
|
|
#endif /* prmem_h___ */
|