Unused slabs which get recycled are no longer reinitialized from scratch if their chunk size matches what the allocator needed. If the chunk size matches, the list of available chunks is left unchanged, and just the various counters are reset.
Added __get_slab_stats() function.
Added support for global __slab_purge_threshold tuning variable.
Added a short test program for the slab allocator.
The malloc-test program was linked against the wrong object file in GNUmakefile.68k. Fixed.
- Replaced ISO Latin 1 code #160 with a plain blank space (ASCII code #32) where necessary
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request to allocate 0 bytes as an error, returning NULL. They all
return a pointer sized memory chunk (= four bytes) initialized to
NULL (= 0) instead.
- The alloca() implementation which allocates memory from the system
rather than the local stack frame is thread-safe now. It also
interacts with the realloc(), calloc(), free() and malloc() functions
in that the alloca() cleanup routine is called once alloca() has
done its job. If all the memory allocated through alloca() has been
released no further calls to the cleanup function will be made.
- In the thread-safe library, realloc() permitted two different overlapping
calls to succeed in trying to reallocate the same chunk of memory due to
a race condition. Fixed.
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request to allocate 0 bytes as an error, returning NULL. They all
return a 1 byte memory chunk initialized to 0 instead.
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- Dropped unused stub code which is now redundant because of
the constructor/destructor mechanism.
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code which initialized them.
- Reading/changing the errno variable is no longer done directly, but
involves accessor functions.
- References to the HUGE_VAL quantity now involve an accessor function, too.
- Changed the manner in which the __huge_val constant is initialized by
the __math_init() function.
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to the built-in function.
- Updated the stdio.h, stdlib.h, string.h and unistd.h header files
to declare function prototypes for the __MEM_DEBUG versions of the
library functions only if that preprocessor symbol is defined.
- If a SIGINT signal is caught and processed by the default signal
handler, the localized "*** BREAK" string will be printed rather
than the built-in one.
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management code in the default link library along with the
normal versions. Let's see how well this works out in the GCC
version. SAS/C does not seem to like it...
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