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.
If the first slab in the list of slabs which share the same chunk size has no more room, it means that all other slabs following it have no room either. This speeds up the test to find a slab with free space, which can now abort and directly proceed to allocate memory for a new slab.
If an empty slab's decay count hits zero, it is moved to the front of the empty slab list to be reclaimed more quickly.
Allocations made from the slab now carry a pointer back to the slab which they are a part of. This speeds up deallocation but has the downside of making the smallest usable slab chunk size 64 bytes, which is double what used to be the minimum before.
Added a slab allocator which replaces the use of memory pools or the plain AllocMem() operations, respectively. In order to activate the slab allocator, choose a slab size (e.g. 2048 bytes or 4096 bytes) and declare a global variable like this:
ULONG __slab_max_size = 2048;
Memory allocations smaller than the slab size will be made from "slabs", i.e. large chunks of memory of the given size. Larger allocations will be managed separately.
A slab-allocator can now be used as the back-end for all memory allocations by setting __slab_max_size to a value > 0. This controls the slab size used for allocations and should be a power of 2, such as 2048 or 4096 bytes.
This change still needs testing.
hard-coded. You can override it at link time with a different
variable value for __break_signal_mask. This may have to be
augmented by an API for changing the value.
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counters for "maximum amount of memory used" and "maximum number of chunks
allocated" to the current figures for these values.
- Fixed the alloca() declaration in <stdlib.h> so that software which keys
off the fact whether or not the alloca preprocessor symbol is defined
will do the right thing.
- Added an optional call-back function which can be called if alloca()
is about to return NULL, which some software does not consider.
Rather than letting such software drop into an illegal memory access
or worse, that call-back function will be invoked instead, which can
print an error message and eventually call abort().
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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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feclearexcept(), fegetenv(), fegetexceptflag(), fegetround(),
feholdexcept(), feraiseexcept(), fesetenv(), fesetexceptflag(),
fetestexcept(), fetestround() and feupdateenv().
- Replaced the old pow() implementation. However, powf() may need to
be changed to set a domain error.
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socket into a separate function which can be overridden by user code.
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daemon startup message by default. You now have to enable this feature
by declaring a global variable called "__check_daemon_startup" which is
described in <dos.h>.
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- The thread-safe library now tries to enable bsdsocket.library base
sharing and attempts to make the TCP/IP stack call the local
__set_errno() and __set_h_errno(), so that any Process calling
the library functions will get a chance to see proper error
codes. Whether any of these features could be enabled can be tested
through two global variables __can_share_socket_library_base and
__thread_safe_errno_h_errno which are defined in <dos.h>. Note that
for both features to work you will need the Roadshow bsdsocket.library
version 4.275 or higher.
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for building code that references the networking API. It is now possible,
provided you build your code with an existing TCP/IP API header file
set (such as from the "Roadshow" SDK) without running into data type
or function prototype declaration conflicts. I have added local versions
of <arpa/inet.h>, <netinet/in.h>, <netdb.h>, <sys/filio.h>, <sys/ioccom.h>,
<sys/ioctl.h>, <sys/select.h> and <sys/socket.h> and updated <unistd.h>,
<pwd.h> and <grp.h> accordingly. Note that some of the function prototypes
will conflict with the bsdsocket.library/usergroup.library API, which is
why you can disable the declarations through the __NO_NET_API preprocessor
symbol: if defined, none of the function prototypes will be defined.
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be defined in <unistd.h> have been moved into a separate header file
<sys/clib2_net.h> which, for backwards compatibility, can be include
from within <unistd.h> if the preprocessor symbol __USE_CLIB2_NETLIB
is defined early on. Eventually, <sys/clib2_net.h> should be removed
from the general header files and become a local library build header
file altogether. Note that in this case you would have to build your
own software using common TCP/IP SDK header files.
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files which initialize global data, such as the new "stdlib_program_name.c"
and "stdlib_malloc.c".
- Until I can find a way to invoke it from within the library, the
__machine_test() function is no longer invoked.
- Tagged global data with NOCOMMON attributes.
- Added the __lib_init() and __lib_exit() functions, which are part of the
thread-safe library and which can be used to hook up clib2 with standard
Amiga shared library/device code. Some documentation on how to use them
can be found in the <dos.h> header file.
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least for clib2) ftell() and fseek() functions, respectively.
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to add it to libunix.a rather than keeping it in a separate libtermios.a
library.
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- nan() and nanf() now return quiet NaNs.
- Added internal __inf() and __inff() functions.
- strtof() now calls nanf() and __inff(), respectively, to produce
the special floating point values for nan/inf/infinity.
- strtod() now calls nan() and __inf(), respectively, to produce
the special floating point values for nan/inf/infinity.
- The scanf() family now calls nan() and __inf(), respectively, to
produce the special floating point values for nan/inf/infinity.
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islessequal() and islessgreater() to <math.h> for C99.
- The wchar_t type is now an 'unsigned short' integer (16 bits wide).
- Added PTRDIFF_MIN/PTRDIFF_MAX, WCHAR_MIN/WCHAR_MAX and
WINT_MIN/WINT_MAX to <stdint.h> for C99.
- Added imaxdiv() and imaxabs() for C99.
- Added strtoimax() and strtoumax() for C99.
- Added nextafter() and nextafterf() for C99.
- Added copysign() and copysignf() for C99.
- Unless I missed something, clib2 should now be functionally complete
with regard to C99, except for the floating point operations covered.
These are a major challenge all by themselves, and I wonder both
whether they are worth the effort and how one could implement them
correctly.
- fflush() now consistently supports a NULL parameter, causing all
streams to be flushed for which this behaviour is defined.
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number rather than a decimal one. Now how odd is that?
- strtod() and strtof() now support "inf"/"infinity"/"nan"/"nan(..)" and
hexadecimal floating point numbers, for C99.
- Added the fpclassify(), isfinite(), isnormal() and signbit() macros for C99.
- Reimplemented isnan() and isinf() as macros for C99. The corresponding
functions will be dropped from the library. Note that the isinf() macro
does not return -1, 0 or 1 like the old function did, but only 0 or 1
depending upon whether the parameter represents +/- infinity or not.
- Added fabsf() for C99.
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very much! This includes the following:
- Added SSIZE_MAX to <limits.h>.
- Added <sys/uio.h>, readv() and writev().
- Cut back the soft link resolution code in lstat().
- In <fcntl.h> O_NDELAY is now an alias for O_NONBLOCK.
- Added <complex.h>, carg(), cargf(), cargl(), cimag(), cimagf(),
cimagl(), conj(), conjf(), conjl(), creal(), crealf() and creall().
Note that the C99 support for the complex floating point data
types is limited to GCC 3.x for now.
- Added va_copy() to <stdarg.h>.
- Added _Exit() to <stdlib.h>.
- Added <stdbool.h>.
- Added vfscanf() to <stdio.h>.
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a separate file.
- Simplified the library/open close code in "stdlib_main.c".
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should no longer spell big trouble on account of the stdio
data structures possibly not being in a well-defined and
initialized state.
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- Dropped unused stub code which is now redundant because of
the constructor/destructor mechanism.
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that the constructors/destructors are called in the proper
order, too.
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or initializes it.
- The stdlib constructor now performs the CPU/FPU compatibility test.
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Both the 68k and PowerPC platform now invoke them in the same order
and the 68k code uses the designated invocation priorities. The
PowerPC destructor function now sets up the exit() jmp_buf before
the destructor functions are called.
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socket_data.c, dirent_data.c and stdio_data.c and into the
code that initializes them.
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initialization code for the stdin/stdout/stderr streams and
out of the program parameter setup.
- The current program name is now set up in the stdlib
initialization function.
- Simplified the machine test code; moved the FPU check into
the math initialization code.
- Added more safety checks to verify that file descriptor
file handles are valid.
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into a dedicated module. This also has the advantage that it's
harder to break code by accidentally forgetting to call
InitSemaphore() after having allocated the memory for it.
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contributed by Peter Bengtsson. Thank you very much!
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and dirent data operations. That should do it! While the library is
not reentrant (this is not ixemul.library) it should be thread-safe
now. Thread-safe in the sense of POSIX 1003.1c-1995.
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and ftrylockfile().
- Modified the internal FILE structure to allow for thread locking.
Note that this again requires that the library is rebuilt!
- Added or modified macros for getc_unlocked(), getchar_unlocked(),
putc_unlocked() and putchar_unlocked().
- Added rand_r().
- Added flockfile()/funlockfile() wrappers around all stdio
functions.
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parameters (which is by default linked in with libunix.a),
regular expressions can no longer prompt dos.library requesters
to appear. However, to be on the safe side, if you are expecting
to pass regular expressions on the command line, do not use
the wildcard expansion code such as by overriding the library
symbols with dummy functions such as are used in the file
"stdlib_wildcard_expand.c".
- Added a new variable '__open_locale' which can be used to
restrict all library functions to use the "C" language locale
rather than the current system locale settings. In addition
to that, two new functions __locale_exit() and __locale_init()
can be used to close and (re-)open the system locale at a
later time.
- Local ("static") functions are now identified by the STATIC
qualifier. This was done in preparation for changes that will
deal with global and local data and the issue of thread safety.
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function pointers alone. The utility.library/CallHookPkt mechanism
is no longer required.
- Moved the entire lseek() code relevant for files into the hook
function.
- Simplified the close() function which now just calls into the
hook code to perform whatever is necessary. The hook code is
responsible for cleaning up after aliases, etc. This change in
turn made it possible to greatly simplify the hook code for
buffered files which now bypasses close/read/write/lseek and
directly invokes the hook code for unbuffered files.
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the file descriptor hook and into the respective functions,
such as dup2(), fchmod(), fchown(), fcntl(), fdatasync(), fstatfs(),
fsync(), ftruncate() and lseek(). Code which is not strictly
required will no longer find its way into your programs if you
link with the updated library.
NOTE: these changes require that the entire library is rebuilt!
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<inttypes.h> header files contributed by Peter Bengtsson. Thank
you very much!
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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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so far as used by the the __convert_time() function and the conversion
code in strftime().
- Also changed the algorithm used by strftime() to produce the week numbers
(the '%U' and '%W' format specifiers). The new method is much simpler
than the old one.
- Made the code that converts a 'time_t' value into the 'struct DateStamp',
as used by strftime() and utime(), into its own function. This also
fixes a bug in the code strftime() would use which was completely
unaware of the local time zone settings.
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