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Diffstat (limited to 'kdecore/malloc/README')
| -rw-r--r-- | kdecore/malloc/README | 56 |
1 files changed, 0 insertions, 56 deletions
diff --git a/kdecore/malloc/README b/kdecore/malloc/README deleted file mode 100644 index 6a24a39db..000000000 --- a/kdecore/malloc/README +++ /dev/null @@ -1,56 +0,0 @@ - - This malloc is based on Doug Lea's malloc ( ftp://gee.cs.oswego.edu/pub/misc/ ), the changes -are listed below. See http://lists.kde.org/?l=kde-core-devel&m=101351949010285&w=2 for details. -Basically, it's here because for now it has better performance than both glibc-2.2.x and -FreeBSD's libc. - - There's a new configure switch, --enable-fast-malloc. By default it's turned off, disabling -the system libc one and using this one. Using --enable-fast-malloc=full enables this -malloc unconditionally, aiming for the maximum performance. By using only --enable-fast-malloc, -it's possible to select both malloc implementations at runtime. When $KDE_MALLOC is set to 0, -the system libc malloc is used, otherwise this malloc is used. - - For now, the requirements are : - - x86 CPU (because of the spinlock implementation in assembler), it should be easy to add - new ones - - glibc (for --enable-fast-malloc=yes, =full doesn't need it), because it needs to refer - to the libc implementation of malloc (__libc_malloc etc.) - - gcc (for __inline__ , nothing else should depend on gcc) - - - If you have any problem with this malloc, try first using --enable-fast-malloc=debug and -recompiling libtdecore, or use valgrind. This malloc seems to be more vulnerable to heap -corruption, such as deleting a block twice, so faulty code may run without problems -with standard malloc shipped with your libc, but it will crash with this malloc. In case -you think there's any problem with this malloc, please mail me. - -changes (against malloc-2.7.0): - -#define USE_MALLOC_LOCK -#define INLINE __inline__ -#define USE_MEMCPY 0 -#define MMAP_CLEARS 1 -made all functions INLINE -added #ifdef KDE_MALLOC_DEBUG -> #define DEBUG -reordered all functions in order to avoid 'warning: `XYZ' declared inline after being called' - especially moved the public_* ones at the end of the file -commented out #including malloc.h -added #include <config.h> at the top and enclosed whole file in #ifdef KDE_MALLOC -taken posix_memalign() from glibc -removed public icalloc(),icomalloc(),mtrim(),musable() (they don't exist everywhere anyway) -enclosed the pthreads part by #if 0 and replaced it with spinlock from glibc CVS (in x86.h) - also added : ----------- -static mutex_t spinlock = MUTEX_INITIALIZER; -#define MALLOC_PREACTION lock( &spinlock ) -#define MALLOC_POSTACTION unlock( &spinlock ) ----------- -public functions call either functions in this malloc or in libc, depending on $KDE_MALLOC -the kde_malloc_is_used hack - - -TODO: -malloc_set_state/malloc_get_state ? - - -Lubos Lunak <l.lunak@kde.org> |