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127 lines
4.6 KiB
C
127 lines
4.6 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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** File: prmem.h
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** Description: API to NSPR memory management functions
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**
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*/
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#ifndef prmem_h___
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#define prmem_h___
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#include "prtypes.h"
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#include <stdlib.h>
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PR_BEGIN_EXTERN_C
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/*
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** Thread safe memory allocation.
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**
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** NOTE: pr wraps up malloc, free, calloc, realloc so they are already
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** thread safe (and are not declared here - look in stdlib.h).
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*/
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/*
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** PR_Malloc, PR_Calloc, PR_Realloc, and PR_Free have the same signatures
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** as their libc equivalent malloc, calloc, realloc, and free, and have
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** the same semantics. (Note that the argument type size_t is replaced
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** by PRUint32.) Memory allocated by PR_Malloc, PR_Calloc, or PR_Realloc
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** must be freed by PR_Free.
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*/
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NSPR_API(void *) PR_Malloc(PRUint32 size);
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NSPR_API(void *) PR_Calloc(PRUint32 nelem, PRUint32 elsize);
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NSPR_API(void *) PR_Realloc(void *ptr, PRUint32 size);
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NSPR_API(void) PR_Free(void *ptr);
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/*
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** The following are some convenience macros defined in terms of
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** PR_Malloc, PR_Calloc, PR_Realloc, and PR_Free.
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*/
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/***********************************************************************
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** FUNCTION: PR_MALLOC()
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** DESCRIPTION:
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** PR_NEW() allocates an untyped item of size _size from the heap.
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** INPUTS: _size: size in bytes of item to be allocated
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** OUTPUTS: untyped pointer to the node allocated
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** RETURN: pointer to node or error returned from malloc().
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***********************************************************************/
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#define PR_MALLOC(_bytes) (PR_Malloc((_bytes)))
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/***********************************************************************
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** FUNCTION: PR_NEW()
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** DESCRIPTION:
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** PR_NEW() allocates an item of type _struct from the heap.
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** INPUTS: _struct: a data type
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** OUTPUTS: pointer to _struct
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** RETURN: pointer to _struct or error returns from malloc().
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***********************************************************************/
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#define PR_NEW(_struct) ((_struct *) PR_MALLOC(sizeof(_struct)))
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/***********************************************************************
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** FUNCTION: PR_REALLOC()
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** DESCRIPTION:
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** PR_REALLOC() re-allocates _ptr bytes from the heap as a _size
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** untyped item.
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** INPUTS: _ptr: pointer to node to reallocate
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** _size: size of node to allocate
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** OUTPUTS: pointer to node allocated
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** RETURN: pointer to node allocated
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***********************************************************************/
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#define PR_REALLOC(_ptr, _size) (PR_Realloc((_ptr), (_size)))
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/***********************************************************************
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** FUNCTION: PR_CALLOC()
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** DESCRIPTION:
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** PR_CALLOC() allocates a _size bytes untyped item from the heap
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** and sets the allocated memory to all 0x00.
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** INPUTS: _size: size of node to allocate
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** OUTPUTS: pointer to node allocated
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** RETURN: pointer to node allocated
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***********************************************************************/
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#define PR_CALLOC(_size) (PR_Calloc(1, (_size)))
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/***********************************************************************
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** FUNCTION: PR_NEWZAP()
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** DESCRIPTION:
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** PR_NEWZAP() allocates an item of type _struct from the heap
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** and sets the allocated memory to all 0x00.
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** INPUTS: _struct: a data type
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** OUTPUTS: pointer to _struct
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** RETURN: pointer to _struct
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***********************************************************************/
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#define PR_NEWZAP(_struct) ((_struct*)PR_Calloc(1, sizeof(_struct)))
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/***********************************************************************
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** FUNCTION: PR_DELETE()
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** DESCRIPTION:
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** PR_DELETE() unallocates an object previosly allocated via PR_NEW()
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** or PR_NEWZAP() to the heap.
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** INPUTS: pointer to previously allocated object
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** OUTPUTS: the referenced object is returned to the heap
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** RETURN: void
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***********************************************************************/
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#define PR_DELETE(_ptr) { PR_Free(_ptr); (_ptr) = NULL; }
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/***********************************************************************
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** FUNCTION: PR_FREEIF()
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** DESCRIPTION:
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** PR_FREEIF() conditionally unallocates an object previously allocated
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** vial PR_NEW() or PR_NEWZAP(). If the pointer to the object is
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** equal to zero (0), the object is not released.
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** INPUTS: pointer to previously allocated object
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** OUTPUTS: the referenced object is conditionally returned to the heap
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** RETURN: void
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***********************************************************************/
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#define PR_FREEIF(_ptr) if (_ptr) PR_DELETE(_ptr)
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PR_END_EXTERN_C
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#endif /* prmem_h___ */
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