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| | The Old Joel on Software Forum - malloc()ing powers of 2? |
 | | Malloc() has an admin overhead of allocating the chunk of memory and that itself should be on an even boundary so that you don't get into the hi-low fetch swapping problem. | | | malloc() was implemented to optimize for certain use patterns. | | | From memory, ugh inadvertent pun, on i86 sbrk() which partitions memory when malloc() runs out of memory that it last sbrk()'d it does so on paragraph boundaries (the least 4 bits are zero). |
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http://discuss.fogcreek.com/joelonsoftware?cmd=show&ixPost=118148
(1164 words)
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| | malloc |
| | The present implementation of malloc() started out as a filesystem on a drum attached to a 20-bit binary challenged computer built with discrete germanium transistors, and it has since graduated to handle primary stor- age rather than secondary. | | | The malloc() and calloc() functions return a pointer to the allocated space if successful; otherwise, a null pointer is returned and errno is set to ENOMEM. | | | Most malloc() implementations will store a data structure containing a, possibly dou- ble-, linked list in the free chunks of memory, used to tie all the free memory together. |
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http://resin.csoft.net/cgi-bin/man.cgi?section=3&topic=malloc
(1373 words)
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| | malloc(Visual C++ Programmer's Guide) |
| | The startup code uses malloc to allocate storage for the _environ, envp, and argv variables. | | | The malloc function allocates a memory block of at least size bytes. | | | malloc returns a void pointer to the allocated space, or NULL if there is insufficient memory available. |
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http://msdn.microsoft.com/library/en-us/vccore98/html/_crt_malloc.asp
(379 words)
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| | malloc - Man Pages at IceWalkers.com |
| | malloc() allocates size bytes and returns a pointer to the allocated memory. | | | RETURNVALUE For calloc() and malloc(), the value returned is a pointer to the allocated memory, which is suitably aligned for any kind of variable, or NULL if the request fails. | | | MALLOC(3) Linux Programmer's Manual MALLOC(3) NAME calloc, malloc, free, realloc - Allocate and free dynamic memory SYNOPSIS #include void*calloc(size_t nmemb,size_t size); void*malloc(size_t size); voidfree(void *ptr); void*realloc(void *ptr,size_t size); DESCRIPTION calloc() allocates memory for an array of nmemb elements of size bytes each and returns a pointer to the allocated memory. |
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http://www.icewalkers.com/Linux/ManPages/malloc-3.html
(547 words)
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| | Technical Reference: Base Operating System and Extensions, Volume 1 - malloc, free, realloc, calloc, mallopt, mallinfo, ... |
| | The malloc subroutine returns a pointer to a block of memory of at least the number of bytes specified by the Size parameter. | | | The malloc, realloc, calloc, and valloc subroutines return a null pointer if there is no available memory, or if the memory arena has been corrupted by being stored outside the bounds of a block. | | | If the malloc or valloc subroutine is called with a size of 0, the subroutine returns a null pointer. |
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http://publib16.boulder.ibm.com/pseries/Ja_JP/libs/basetrf1/malloc.htm
(1396 words)
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| | Malloc |
| | Malloc takes one argument-a positive integer indicating how many bytes of storage are needed. | | | Malloc is declared in the header file " | | | The built-in function that actually allocates the memory, and returns a pointer to it, is "malloc". |
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http://www.cs.utah.edu/~hamlet/release/lib/lib/lessons/c29/node2.shtml
(342 words)
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| | Manual page for malloc(3X) |
| | Function prototypes for malloc(), realloc(), calloc(), and free() are also defined in the header for compatibility with old applications. | | | malloc(), realloc(), and calloc() return a NULL pointer if there is not enough available memory. | | | malloc, free, realloc, calloc, mallopt, mallinfo - memory allocator |
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http://www.cs.utk.edu/~cs460.is&r/cgi-bin/group4/collection/free.3x.html
(572 words)
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| | CS360 Lecture notes -- Malloc Lecture #1 |
| | Unfortunately, the implementation of malloc() and free() on the cetus and hydra machines does not match my description 100 percent -- see this note on how to map one to the other. | | | you might generate a bus error, because malloc() may return a value that is not a multiple of 4. | | | What this does is allocate a whole bunch of memory regions using malloc(), and then it prints out their starting addresses, and the values that are located one and two words (I use "word" to denote a 4-byte quantity) before the starting addresses. |
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http://www.cs.utk.edu/~plank/plank/classes/cs360/360/notes/Malloc1/lecture.html
(1316 words)
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| | alloc.h |
| | It allocates a block of Size bytes on the CPU stack (local storage space), in opposite to malloc which allocates memory on the memory heap. | | | malloc allocates a block of Size bytes from the memory heap. | | | free deallocates a memory block allocated by a previous call to malloc or calloc. |
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http://tigcc.ticalc.org/doc/alloc.html
(2953 words)
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| | General Programming Concepts: Writing and Debugging Programs - Malloc Buckets |
| | For optimal performance, malloc buckets should be enabled and configured on a per-application basis. | | | This allows the malloc subsystem to support concurrent enablement of malloc buckets and malloc multiheap so that threaded processes running on multiprocessor systems can benefit from the buckets algorithm. | | | The value of n is also used to determine how many blocks to add when a bucket is automatically enlarged because all of its blocks have been allocated. |
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http://www.ncsa.uiuc.edu/UserInfo/Resources/Hardware/IBMp690/IBM/usr/share/man/info/en_US/a_doc_lib/aixprggd/genprogc/malloc_buckets.htm
(1430 words)
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| | malloc |
| | The malloc() function allocates unused space for an object whose size in bytes is specified by size and whose value is indeterminate. | | | If the size of the space requested is 0, the behaviour is implementation-dependent; the value returned will be either a null pointer or a unique pointer. | | | If size is 0, either a null pointer or a unique pointer that can be successfully passed to free() will be returned. |
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http://www.opengroup.org/onlinepubs/007908799/xsh/malloc.html
(208 words)
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| | Why is Malloc Different Under uClinux? |
| | This version of malloc has since been merged with malloc-simple as the extra code required is no longer a significant overhead when using shared libraries for uClinux. | | | Several small malloc implementations have been created to alleviate point 1 by reducing the effect of the 56 byte overhead by allocating larger blocks and then managing those blocks internally for better results. | | | Generally the more complex mallocs deliver faster allocations and are more efficient for small allocations. |
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http://www.linuxdevices.com/articles/AT7777470166.html
(2160 words)
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| | Avoid Using malloc() and free() in C++ |
| | malloc() requires the exact number of bytes as an argument whereas new calculates the size of the allocated object automatically. | | | malloc() does not handle allocation failures, so you have to test the return value of malloc() on each and every call. | | | The use of objects allocated this way is undefined and should never occur. |
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http://www.devx.com/tips/Tip/12491
(231 words)
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| | efence(3): Electric Fence Malloc Debugger - Linux man page |
| | By default, Electric Fence traps calls to malloc() with a size of zero, because they are often the result of a software bug. | | | Then, Electric Fence malloc() will return an address such that the first byte after the end of the allocation is on the inaccessible page. | | | Electric Fence helps you detect two common programming bugs: software that overruns the boundaries of a malloc() memory allocation, and software that touches a memory allocation that has been released by free(). |
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http://www.die.net/doc/linux/man/man3/efence.3.html
(2070 words)
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| | New Malloc |
| | Similar algorithm to BSD's malloc, but uses binary search to find buckets and doesn't pre-allocate small chunks. | | | This is just a simulated suite of calls used to compare the various mallocs fairly. | | | The test keeps track of elapsed CPU time, total memory used, and the amount of memory the program thinks it has. |
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http://www.delorie.com/djgpp/malloc
(448 words)
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| | [No title] |
| | The debug_malloc Library The debug_malloc library is a replacement for the standard malloc and strings library routines that can be used during software development/debugging. | | | * Each malloc segment is filled with a distinctive non-zero pattern so code that depends upon malloc segments being filled with null characters will fail. | | | EFFICIENCY The debug_malloc library is much less efficient than the standard library due in part to the extra error checking, and thus should only be used during development and testing. |
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http://zoo.cs.yale.edu/classes/cs223/doc/dbmalloc
(696 words)
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| | avr-libc: <stdlib.h>: General utilities |
| | If malloc() fails, a NULL pointer is returned. | | | Note that malloc() does not initialize the returned memory to zero bytes. | | | If the new memory cannot be allocated, realloc() returns NULL, and the region at |
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http://www.nongnu.org/avr-libc/user-manual/group__avr__stdlib.html
(2144 words)
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| | HI-TECH Software Forums: malloc |
| | If not, there is malloc source code in the HI-TECH sources directory and there are malloc implementations available on the Internet, so you could implement your own even though indiscriminate use of dynamic memory allocation facilities is ill-advised in embedded systems (just a word of warning -- I'm not saying you lack judgement!). | | | I did not download the FlashFile source code to see for myself, but you might do a quick check to see if its malloc usage is for fixed sized blocks, in which case you could easily dispense with the dynamic sized aspect of malloc and roll your own block memory manager. | | | You have to include malloc.c from the sources directory in your project. |
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http://www.htsoft.com/forum/all/showflat.php?Cat=&Board=pic&Number=10360
(445 words)
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| | malloc Free discussion |
| | If malloc returns NULL then it could not allocate the memory you need. | | | malloc() itself uses 4 bytes more for internal bookkeeping. | | | Thust repeat the malloc() in a loop until it returns a non-zero value? |
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http://qaix.com/cpp-programming/302-770-malloc-read.shtml
(4508 words)
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| | Not Just Another Malloc Debugger |
| | Malloc debuggers change all this by mapping protected memory before or after your buffer, so your program crashes immediately after an overflow. | | | This is due to the fact that malloc implementations store book keeping information before and after allocated segments. | | | In addition, it is able to trace memory leaks even through arbitrary library functions that wrap malloc(3), such as strdup(3), GUI widget allocators, and even C++ new and delete. |
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http://fscked.org/proj/njamd.shtml
(678 words)
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| | A Memory Allocator |
| | These papers find that versions of this malloc increasingly rank as simultaneously among the most time- and space-efficient memory allocators available. | | | However, the 16 bytes minimum at least is characteristic of any system requiring 8-byte alignment in which there is any malloc bookkeeping overhead. | | | The majority of recent changes were instigated by people using the version supplied in Linux, and were implemented in large part by Wolfram Gloger for the Linux version and then integrated by me. |
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http://gee.cs.oswego.edu/dl/html/malloc.html
(2938 words)
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| | Malloc Debug Library |
| | For the malloc debug library only the place of the allocation counts which makes it difficult to track down memory leaks because all the structures allocated in a function like that will have the same file position. | | | With this macro you can set the file position to the position where the macro was invoked. | | | The malloc debug library implements wrappers for the normal heap handling functions: |
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http://www.hexco.de/rmdebug
(2171 words)
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| | User's Guide - Using Debug Memory Routines for XL Fortran |
| | Note that the external interfaces and functionality of malloc, free, calloc, realloc, and strdup are not shown in this table, since they have not changed. | | | It may also be invoked explicitly in areas of code where a user believes there may be memory problems. | | | This routine prints information to stderr about each memory block that is currently allocated or was allocated using the debug memory management routines. |
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http://www.ncsa.uiuc.edu/UserInfo/Resources/Hardware/IBMp690/IBM/usr/share/man/info/en_US/xlf/html/UG93.HTM
(1059 words)
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| | developerWorks : Power Architecture : Forums : malloc on SPU |
| | The malloc subroutine attempts to allocate at least size bytes from local store memory heap. | | | This is what I have gathered from backtracking some really strange bugs where my program seems to just freeze on (in the source code) simple arithmetic instructions (such as spu_add). | | | And in my fist example, if I change the malloc size from 1024 to 128 malloc fails and returns NULL. |
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http://www-128.ibm.com/developerworks/forums/dw_thread.jsp?forum=739&thread=102642&cat=46
(333 words)
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| | A Framework for the User Defined Malloc Replacement Feature |
| | Recognizing the need to support user-supplied malloc subsytem implementations, the malloc plug-in feature was added to AIX 4.3.3. | | | This article has drawn upon existing documentation in the AIX General Programming Concepts: Writing and Debugging Programs manual, with the goal of elaborating on the malloc replacement feature using working code, as well as touching upon other facets of the AIX such as creating and using shared modules. | | | This feature allows a developer to create a dynamically loadable module that implements the complete allocation subsystem interface and use this module in any existing application, without recompilation or relinking. |
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http://www.ibm.com/developerworks/eserver/articles/framework.html
(2988 words)
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| | Trouble with malloc and multithreading - GameDev.Net Discussion Forums |
| | Right now we think that we could use the primary thread (the one that can allocate memory without problem) as a 'malloc server' and switch to the primary thread every time before calling malloc, and then switch back. | | | The thread itself needs about 130 bytes (for registers, priority and status etc.) and our default stack size is 2kB (pretty tight with memory on the GBA). |
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http://www.gamedev.net/community/forums/topic.asp?topic_id=107530
(771 words)
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| | casting return value from malloc - dBforums |
| | \r\nbehaviour with malloc, cast or no cast, header or no header. | | | \r\nfrom malloc() and related functions because it is unnecessary and can | | | >from malloc() and related functions because it is unnecessary and can |
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http://www.dbforums.com/t508350.html
(4728 words)
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| | The Old Joel on Software Forum - Don't you malloc() me... |
| | Separately implemented versions of malloc will belong to their respective creators. | | | Ummm as Caldera were the beneficiaries of the Digital Research v Microsoft suit it would be a supreme irony of corporate relations that saw Caldera doing Microsoft's work for them. | | | The idea that SCO, was Novell, was Unix Labs, was ATTL could lay claim to copyrighting malloc() |
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http://discuss.fogcreek.com/joelonsoftware?cmd=show&ixPost=65107
(488 words)
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| | Augmented malloc interface |
| | malloc: No, I cannot change the size of your 1000 byte memory block. | | | malloc: No, but I can expand your 1000 byte block to 1500 bytes. | | | I'll just allocate a new 2000 byte block. |
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http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1085.htm
(2112 words)
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| | Mark_malloc |
| | For example, each time a pointer becomes useless somewhere in our code, free it systematically, even if we will do a malloc of the same size in the next line (this is the extreme case, as you can imagine, but you get the point). | | | This is nonsense, we all make errors, and malloc/free errors are some of the most elusive (distributed programming is even harder, but that's off-topic). | | | A solution could be to impose upon us the use of some coding practice. |
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http://sed.free.fr/mark_malloc
(1348 words)
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| | Constructor call with malloc? - GameDev.Net Discussion Forums |
| | There are no maintenence costs with overloading new and delete, that's why they exist and the best way to get with the language would be to use its more powerfull features (operator overloading and the like) to make his code easier to use. | | | Posted - 3/16/2005 9:28:36 PM I think this is a pretty bad idea, but here's an example of how you could do it. | | | Seeing as I'm a die-hard C programmer and shudder to think of anyone but me messing around with my memory allocation, is there any way to call the default/any constructor after mallocing? |
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http://www.gamedev.net/community/forums/topic.asp?topic_id=307385&whichpage=1�
(1046 words)
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| |
| | 11.1 Allocating Memory with malloc |
| | As a second example, we might have occasion to allocate a piece of memory, and to copy a string into it with | | | A ``byte'' in C is, by definition, an amount of storage suitable for storing one character, so the above invocation of | | | If we didn't want to read a line of input into a fixed-size array, we could use |
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http://www.eskimo.com/~scs/cclass/notes/sx11a.html
(968 words)
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| | malloc |
| | The function malloc() returns a pointer to a chunk of memory of size size, or NULL if there is an error. | | | The memory pointed to will be on the heap, not the stack, so make sure to free it when you are done with it. |
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http://www.cppreference.com/stdmem/malloc.html
(79 words)
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| |
| | Infrequently Asked Questions in comp.lang.c |
| | The standard does not specify an allocation scheme; the famous author the allocation scheme is based on is implementation specified. | | | Not exactly; because the objects are dynamically allocated, their size can change at run time, so this will not be reliable. | | | 6.6: So can I query the malloc package to find out how big an allocated block is? |
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http://www.plethora.net/~seebs/faqs/c-iaq.html
(7043 words)
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| | Malloc vs Calloc - ITtoolbox Groups |
| | Amit 8/26/2005 - Hello List, what the difference between malloc() and calloc(). | | | Also malloc just returns the number of bytes you require, calloc aligns | | | k_srini_cit 8/27/2005 - hi amit malloc is serious of memory allocation, and the memory area con... |
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http://database.ittoolbox.com/groups/technical-functional/CPP-L/810634
(424 words)
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| |
| | Memory Allocation |
| | typedef struct { gpointer (*malloc) (gsize n_bytes); gpointer (*realloc) (gpointer mem, gsize n_bytes); void (*free) (gpointer mem); /* optional; set to NULL if not used ! |
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http://developer.gnome.org/doc/API/2.0/glib/glib-Memory-Allocation.html
(760 words)
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| |
| | Minutes from MALLOC WG - IETF 46, Washington DC |
| | A revised version of the IPv6 multicast address static allocation scheme described in draft-haberman-malloc-static-ipv6-alloc-00.txt is expected soon (but this is not a MALLOC work item). | | | Roger Kermode described the changes included in the latest version of the Multicast Nesting State Option document, which was sent to the malloc mailing list on Tuesday (draft-ietf-malloc-madcap-nest-opt-03.txt). | | | Static Allocation: moved out of MALLOC into MBONED |
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http://www.icir.org/malloc/minutes.99.11.html
(2180 words)
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| |
| | Malloc - Wikipedia, the free encyclopedia |
| | The same dynamic memory allocator is often used to implement both malloc and | | | Definition of malloc in IEEE Std 1003.1 standard | | | Implementation of the allocator on IA-32 architectures is commonly done using the heap, or data segment. |
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http://en.wikipedia.org/wiki/Malloc
(1582 words)
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| | malloc(3C) |
| | malloc(), free(), realloc(), calloc(), valloc(), mallopt(), mallinfo(), memorymap(), alloca() — main memory allocator | | | Makefiles that reference this library will continue to work. |
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http://docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B9106-90010/B9106-90010_top.html&con=/hpux/onlinedocs/B9106-90010/00/03/397-con.html&toc=/hpux/onlinedocs/B9106-90010/00/03/397-toc.html&searchterms=_M_ARENA_OPTS&queryid=20021207-173644
(1370 words)
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| | libc.a reference |
| | Note: this version of malloc is designed to reduce memory usage. | | | This memory must be returned to the heap with |
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http://www.delorie.com/djgpp/doc/libc/libc_551.html
(84 words)
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| | FedoraForum.org - perror after malloc !!! |
| | The C language cannot garantee that errno will be set on a failed malloc because malloc will fail when your computer is out of memory and if your computer is out of memory then you have some other serious issues to worry about then if errno has been set. | | | The Unix98 standard requires malloc(), calloc(), and realloc() to set | | | The C language doesn't garantee that a fail on malloc() will raise |
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http://forums.fedoraforum.org/forum/showthread.php?t=60180
(166 words)
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| | gmane.ietf.malloc |
| | The new address of the list would be: malloc at ietf.org I will automatically subscribe all current members so you don't need to do anything. | | | All, The mailing list of the now concluded IETF MALLOC working group would be moved from its current location to the IETF site. | | | Subject: WG Action: Multicast-Address Allocation (malloc) Working Group to conclude |
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http://blog.gmane.org/gmane.ietf.malloc?set_skin=leftmenu
(1204 words)
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| | Checker - GNU Project - Free Software Foundation (FSF) |
| | Its primary function is to emit a warning when the program reads an uninitialized variable or memory area, or when the program accesses an unallocated memory area. | | | The Malloc library of Checker is very robust, though a bit slower than the usual GNU Malloc. | | | Checker's Malloc will refrain from reusing a freed block immediately; reuse of the block is delayed for some additional number of calls to free. |
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http://www.gnu.org/software/checker/checker.html
(579 words)
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| | malloc() inside functions - dBforums |
| | instances where i find the need to malloc() inside a function and then use that | | | i'm wondering if the malloc storage is local to the | | | dBforums > Usenet Groups > comp.lang.* > comp.lang.c > malloc() inside functions |
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http://www.dbforums.com/showthread.php?t=474043
(81 words)
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| | CITI: Projects: Linux scalability: malloc() performance report |
| | As the C library is built on most Linux distributions, the debugging extensions and tunability are compiled out, so it is necessary to rebuild the C library, or pre-load a separate version of malloc(), in order to take advantage of these features. | | | Of course, both of these system calls are essentially the same under the covers, using anonymous maps to provide large pageable areas of virtual memory to processes. | | | /* * malloc-test * cel - Thu Jan 7 15:49:16 EST 1999 * * Benchmark libc's malloc, and check how well it * can handle malloc requests from multiple threads. |
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http://www.citi.umich.edu/projects/linux-scalability/reports/malloc.html
(1628 words)
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| |
| | MoDaCo -> MicroTurismo Beta *unreleased* |
| | Hey malloc i really like your game, i am wondering if i might be able to see your source, not to finish the game but because i am trying to make a GTA kind of game but can't figure out some things (like rotation of the car etc etc etc) and more?...... | | | it has the potential of a great game, but i would say the gfx need a total overhaul (those f1 cars in particular), i suppose it depends on what the developer feels is satisfactory, and i think malloc himself no doubt feels that lots of work is needed aswell, hence giving up on the project |
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http://www.modaco.com/index.php?showtopic=102321
(1041 words)
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| | Debugging and Performance Tuning with Library Interposers |
| | /* Example of a library interposer: interpose on * malloc(). | | | Using the library interposers described in this article, you can monitor your applications' patterns of system-resource consumption and provide useful feedback to application developers. | | | void *malloc(size_t size) { static void * (*func)(); if(!func) func = (void *(*)()) dlsym(RTLD_NEXT, "malloc"); printf("malloc(%d) is called\n", size); return(func(size)); } |
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http://developers.sun.com/solaris/articles/lib_interposers.html
(1211 words)
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| | Dynamic Memory Allocation and Dynamic Structures |
| | Calloc there is slightly more computationally expensive but, occasionally, more convenient than malloc. | | | Thus to assign 100 integer elements that are all initially zero you would do: | | | If you wish to initialise memory then use |
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http://www.cs.cf.ac.uk/Dave/C/node11.html
(746 words)
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