mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-16 19:48:18 +00:00
181 lines
6.9 KiB
C
181 lines
6.9 KiB
C
|
|
/* W3 Copyright statement
|
|
Copyright 1995 by: Massachusetts Institute of Technology (MIT), INRIA</H2>
|
|
|
|
This W3C software is being provided by the copyright holders under the
|
|
following license. By obtaining, using and/or copying this software,
|
|
you agree that you have read, understood, and will comply with the
|
|
following terms and conditions:
|
|
|
|
Permission to use, copy, modify, and distribute this software and its
|
|
documentation for any purpose and without fee or royalty is hereby
|
|
granted, provided that the full text of this NOTICE appears on
|
|
<EM>ALL</EM> copies of the software and documentation or portions
|
|
thereof, including modifications, that you make.
|
|
|
|
<B>THIS SOFTWARE IS PROVIDED "AS IS," AND COPYRIGHT HOLDERS MAKE NO
|
|
REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED. BY WAY OF EXAMPLE,
|
|
BUT NOT LIMITATION, COPYRIGHT HOLDERS MAKE NO REPRESENTATIONS OR
|
|
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR
|
|
THAT THE USE OF THE SOFTWARE OR DOCUMENTATION WILL NOT INFRINGE ANY
|
|
THIRD PARTY PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS.
|
|
COPYRIGHT HOLDERS WILL BEAR NO LIABILITY FOR ANY USE OF THIS SOFTWARE
|
|
OR DOCUMENTATION.
|
|
|
|
The name and trademarks of copyright holders may NOT be used
|
|
in advertising or publicity pertaining to the software without
|
|
specific, written prior permission. Title to copyright in this
|
|
software and any associated documentation will at all times remain
|
|
with copyright holders.
|
|
*/
|
|
/* W3C Reference Library libwww Dynamic Memory Handlers
|
|
DYNAMIC MEMORY HANDLERS
|
|
|
|
*/
|
|
/*
|
|
** (c) COPYRIGHT MIT 1995.
|
|
** Please first read the full copyright statement in the file COPYRIGH.
|
|
*/
|
|
/*
|
|
|
|
This module defines any memory handler to be used by libwww for allocating and
|
|
de-allocating dynamic memory. As dynamic memory may be a scarce resource, it is
|
|
required that an application can handle memory exhaustion gracefully. This module
|
|
provides an interface that covers the following situations:
|
|
|
|
Handling of allocation, reallocation and de-allocation of dynamic memory
|
|
|
|
Recovering from temporary lack of available memory
|
|
|
|
Panic handling in case a new allocation fails
|
|
|
|
_Note_: The Library _core_ provides a default set of memory handlers for allocating and
|
|
de-allocating dynamic memory. In order to maintain a reasonable performance, they are
|
|
not registered dynamically but assigned using _C style macros_. Hence, it is not
|
|
possible to swap memory handler at run time but this was considered to be a reasonable
|
|
trade-off.
|
|
|
|
This module is implemented by HTMemory.c, and it is a part of the W3C Reference
|
|
Library.
|
|
|
|
*/
|
|
#ifndef HTMEMORY_H
|
|
#define HTMEMORY_H
|
|
/*
|
|
|
|
ALLOCATION, REALLOCATION AND DE-ALLOCATION
|
|
|
|
The Library provides a default set of methods for handling dynamic memory. They are
|
|
very basic and essentially identical to the C style malloc, calloc, realloc, and free:
|
|
|
|
*/
|
|
|
|
/* --- BEGIN added by mharmsen@netscape.com on 7/10/97 --- */
|
|
#ifndef BOOL
|
|
#define BOOL char
|
|
#endif
|
|
/* --- END added by mharmsen@netscape.com on 7/10/97 --- */
|
|
|
|
extern void* HTMemory_malloc(size_t size);
|
|
extern void* HTMemory_calloc(size_t count, size_t size);
|
|
extern void* HTMemory_realloc(void * ptr, size_t size);
|
|
extern void HTMemory_free(void* ptr);
|
|
|
|
/*
|
|
|
|
Memory Macros
|
|
|
|
The methods above are not referred directly in the Library. Instead we use a set of C
|
|
style macros. If you don't wany any memory management beyond normal malloc and alloc
|
|
then you can just use that instead of the HTMemory_* function. You can of course also
|
|
provide your own methods as well.
|
|
|
|
*/
|
|
#ifndef __FILE__
|
|
#define __FILE__ ""
|
|
#endif
|
|
|
|
#ifndef __LINE__
|
|
#define __LINE__ 0L
|
|
#endif
|
|
|
|
#define HT_MALLOC(size) HTMemory_malloc((size))
|
|
#define HT_CALLOC(count, size) HTMemory_calloc((count), (size))
|
|
#define HT_REALLOC(ptr, size) HTMemory_realloc((ptr), (size))
|
|
#define HT_FREE(pointer) {HTMemory_free((pointer));((pointer))=NULL;}
|
|
/*
|
|
|
|
MEMORY FREER FUNCTIONS
|
|
|
|
The dynamic memory freer functions are typically functions that are capable of freeing
|
|
large chunks of memory. In case a new allocation fails, the allocation method looks for
|
|
any registered freer functions to call. There can be multiple freer functions and after
|
|
each call, the allocation method tries again to allocate the desired amount of dynamic
|
|
memory. The freer functions are called in reverseorder meaning that the lastone
|
|
registered gets called first. That way, it is easy to add temporary freer functions
|
|
which then are guaranteed to be called first if a methods fails.
|
|
|
|
Add a Freer Function
|
|
|
|
You can add a freer function by using the following method. The Library may itself
|
|
register a set of free functions during initialization. If the application does not
|
|
register any freer functions then the Library looks how it can free internal memory.
|
|
The freer function is passed the total number of _bytes_ requested by the allocation.
|
|
|
|
*/
|
|
typedef void (*HTMemoryCallback()); /* jhines -- 7/9/97 */
|
|
/* typedef void HTMemoryCallback(size_t size); */
|
|
|
|
extern BOOL HTMemoryCall_add (HTMemoryCallback * cbf);
|
|
/*
|
|
|
|
Delete a Freer Function
|
|
|
|
Freer functions can be deleted at any time in which case they are not called anymore.
|
|
|
|
*/
|
|
extern BOOL HTMemoryCall_delete (HTMemoryCallback * cbf);
|
|
extern BOOL HTMemoryCall_deleteAll (void);
|
|
/*
|
|
|
|
PANIC HANDLING
|
|
|
|
If the freer functions are not capable of de-allocation enough memory then the
|
|
application must have an organized way of closing down. This is done using the panic
|
|
handler. In the libwww, each allocation is tested and HT_OUTOFMEMis called if a NULLwas
|
|
returned. HT_OUTOFMEMis a macro which by default calls HTMemory_outofmem()but of course
|
|
can point to any method. The default handler calls an exit function defined by the
|
|
application in a call to HTMemory_setExit(). If the application has _not_ defined an
|
|
exit function, HTMemory_outofmem()prints an error message and calls exit(1).
|
|
|
|
*/
|
|
typedef void HTMemory_exitCallback(char *name, char *file, unsigned long line);
|
|
|
|
extern void HTMemory_setExit(HTMemory_exitCallback * pExit);
|
|
extern HTMemory_exitCallback * HTMemory_exit(void);
|
|
/*
|
|
|
|
Call the Exit Handler
|
|
|
|
If an allocation fails then this function is called. If the application has registered
|
|
its own panic handler then this is called directly from this function. Otherwise, the
|
|
default behavior is to write a small message to stderr and then exit.
|
|
|
|
*/
|
|
#define outofmem(file, name) HT_OUTOFMEM(name)
|
|
#define HT_OUTOFMEM(name) HTMemory_outofmem((name), __FILE__, __LINE__)
|
|
|
|
extern void HTMemory_outofmem(char * name, char * file, unsigned long line);
|
|
/*
|
|
|
|
*/
|
|
#endif /* HTMEMORY_H */
|
|
/*
|
|
|
|
|
|
___________________________________
|
|
|
|
@(#) $Id: htmemory.h,v 3.1 1998/03/28 03:32:07 ltabb Exp $
|
|
|
|
*/
|