Locking overhead can be significant in some stdio operations
that are common in single threaded applications.
This patch adds the _IO_FLAGS2_NEED_LOCK flag to indicate if
an _IO_FILE object needs to be locked and some of the stdio
functions just jump to their _unlocked variant when not. The
flag is set on all _IO_FILE objects when the first thread is
created. A new GLIBC_PRIVATE libc symbol, _IO_enable_locks,
was added to do this from libpthread.
The optimization can be applied to more stdio functions,
currently it is only applied to single flag check or single
non-wide-char standard operations. The flag should probably
be never set for files with _IO_USER_LOCK, but that's just a
further optimization, not a correctness requirement.
The optimization is valid in a single thread because stdio
operations are non-as-safe (so lock state is not observable
from a signal handler) and stdio locks are recursive (so lock
state is not observable via deadlock). The optimization is not
valid if a thread may be created while an stdio lock is taken
and thus it should be disabled if any user code may run during
an stdio operation (interposed malloc, printf hooks, etc).
This makes the optimization more complicated for some stdio
operations (e.g. printf), but those are bigger and thus less
important to optimize so this patch does not try to do that.
* libio/libio.h (_IO_FLAGS2_NEED_LOCK, _IO_need_lock): Define.
* libio/libioP.h (_IO_enable_locks): Declare.
* libio/Versions (_IO_enable_locks): New symbol.
* libio/genops.c (_IO_enable_locks): Define.
(_IO_old_init): Initialize flags2.
* libio/feof.c.c (_IO_feof): Avoid locking when not needed.
* libio/ferror.c (_IO_ferror): Likewise.
* libio/fputc.c (fputc): Likewise.
* libio/putc.c (_IO_putc): Likewise.
* libio/getc.c (_IO_getc): Likewise.
* libio/getchar.c (getchar): Likewise.
* libio/ioungetc.c (_IO_ungetc): Likewise.
* nptl/pthread_create.c (__pthread_create_2_1): Enable stdio locks.
* libio/iofopncook.c (_IO_fopencookie): Enable locking for the file.
* sysdeps/pthread/flockfile.c (__flockfile): Likewise.
2001-07-06 Paul Eggert <eggert@twinsun.com>
* manual/argp.texi: Remove ignored LGPL copyright notice; it's
not appropriate for documentation anyway.
* manual/libc-texinfo.sh: "Library General Public License" ->
"Lesser General Public License".
2001-07-06 Andreas Jaeger <aj@suse.de>
* All files under GPL/LGPL version 2: Place under LGPL version
2.1.
1999-07-30 Andreas Schwab <schwab@suse.de>
* sysdeps/unix/sysv/linux/getsysstats.c (GET_NPROCS_PARSER): New
definition.
(__get_nprocs): Use it.
(__get_nprocs_conf): Define as separate function if
GET_NPROCS_CONF_PARSER is defined.
* sysdeps/unix/sysv/linux/alpha/getsysstats.c: New file.
* include/sys/sysinfo.h: New file.
* sysdeps/generic/sys/sysinfo.h: Remove declaration of internal
interface.
* sysdeps/unix/sysv/linux/sys/sysinfo.h: Likewise.
1999-07-30 H.J. Lu <hjl@gnu.org>
* libio/iofflush.c (fflush_unlocked): Weak aliase if
_IO_MTSAFE_IO is not defined.
* libio/clearerr.c (clearerr_unlocked): Likewise.
* libio/feof.c (feof_unlocked): Likewise.
* libio/ferror.c (ferror_unlocked): Likewise.
* libio/fputc.c (fputc_unlocked): Likewise.
* libio/getc.c (getc_unlocked, fgetc_unlocked): Likewise.
* libio/getchar.c (getchar_unlocked): Likewise.
* libio/putc.c (putc_unlocked): Likewise.
* libio/putchar.c (putchar_unlocked): Likewise.
1999-07-30 Thorsten Kukuk <kukuk@suse.de>
* sunrpc/Versions: Add svc_getreq_common, svc_getreq_poll,
svc_max_pollfd and svc_pollfd to GLIBC_2.2
* sunrpc/rpc/svc.h: Use rpc*_t types, add new prototypes
for svc_run/poll interface.
* sunrpc/rpc/types.h: Add rpc*_t typedefs.
* sunrpc/rpc_common.c: Add svc_pollfd and svc_max_pollfd as
global variable.
* sunrpc/svc.c: Add svc_getreq_poll and svc_getreq_common,
rewrite other svc_getreq* functions to use svc_getreq_common.
* sunrpc/svc_run.c: Use poll().
1999-07-30 Andreas Schwab <schwab@suse.de>
* Makerules: Put sysd-versions and Versions.all on
postclean-generated instead of common-generated.
1999-07-29 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* manual/time.texi (Basic CPU Time): Note that clock_t can wrap
around and CLOCKS_PER_SEC is 1e6.
1997-02-24 23:05 Wolfram Gloger <wmglo@dent.med.uni-muenchen.de>
* malloc/malloc.c (malloc_get_state): New function.
Saves global malloc state to an opaque data structure which
is dynamically allocated in the heap.
* malloc/malloc.c (malloc_set_state): New function.
Restore previously obtained state.
* malloc/malloc.h: Add declaration of malloc_get_state()
and malloc_set_state().
1997-02-24 23:27 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/libm-ieee754/s_cbrtl.c: Shift B1_EXP value to right
position.
1997-02-24 17:38 Ulrich Drepper <drepper@cygnus.com>
* misc/error.c: Make error and error_at_line weak aliases of
__error and __error_at_line respectively.
Suggested by David Mosberger-Tang <davidm@AZStarNet.COM>.
* sysdeps/unix/sysv/linux/i386/socket.S: Update copyright.
1997-02-22 11:30 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* elf/ldd.bash.in: Run the program directly, not as argument
to the dynamic linker, if it contains an interpreter segment.
* elf/ldd.sh.in: Likewise.
* elf/rtld.c (dl_main): In verify mode check whether the dynamic
object contains an interpreter segment and exit with 2 if not.
1997-02-23 01:23 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* Makefile (distribute): Remove nsswitch.h, netgroup.h, mcheck.h
and xlocale.h. Make-dist adds them automagically.
1997-02-22 12:25 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* locale/C-time.c (_nl_C_LC_TIME): Add missing entry for
time-era-num-entries.
1997-02-06 13:49 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* rellns-sh: No need to check for existance of first parameter.
1997-02-24 15:20 Jonathan T. Agnew <jtagnew@amherst.edu>
* glibcbug.in: Don't mention destination on MAIL_AGENT command line
to avoid duplicate mail.
1997-02-24 03:51 Ulrich Drepper <drepper@cygnus.com>
* Makefile (distribute): Add isomac.c.
(tests): Run isomac test.
* features.h (__USE_ISOC9X): New macro.
* catgets/catgets.c: Don't use global variable `optind'. Instead
use result computed by argp_parse.
* db/makedb: Likewise.
* locale/programs/locale.c: Likewise.
* locale/programs/localedef.c: Likewise.
* libio/stdio.h: Rewrite. Make it more readable and add comments.
* libio/clearerr.c: Remove clearerr_locked alias.
* libio/feof.c: Remove feof_locked alias.
* libio/ferror.c: Remove feof_locked alias.
* libio/fileno.c: Remove fileno_locked alias.
* libio/fputc.c: Remove fputc_locked alias.
* libio/getc.c: Remove getc_locked alias.
* libio/getchar.c: Remove getchar_locked alias.
* libio/iofflush.c: Remove fflush_locked alias.
* libio/putc.c: Remove putc_locked alias.
* libio/putc.c: Remove putchar_locked alias.
* stdio-common/printf_fp.c: When number is inifinity print INF
or inf depending on case of specifier. Same for NaN where NAN
or nan is printed. Specified in ISO C 9X.
* misc/sys/cdefs.h (__restrict): Define to empty string for now.
* stdio/stdio.h: Add __restrict to prototypes where necessary.
* libio/stdio.h: Likewise.
* stdlib/stdlib.h: Likewise.
* string/string.h: Likewise.
* time/time.h: Likewise.
* wcsmbs/wchar.h: Likewise.
* stdlib/strtod.c: Change to recognize INF, INFINITY, NAN, and
NAN(...).
* sysdeps/ieee754/huge_val.h: Define HUGE_VALF and HUGE_VALL instead
of HUGE_VALf and HUGE_VALL.
* stdlib/strtof.c (FLOAT_HUGE_VAL): Use standard name HUGE_VALF
instead of HUGE_VALf.
* wcsmbs/wcstof.c: Likewise.
* stdlib/strtold.c (FLOAT_HUGE_VAL): Use standard name HUGE_VALL
instead of HUGE_VALl.
* wcsmbs/wcstold.c: Likewise.
* sysdeps/posix/gai_strerror.c: Use size_t for counter variable to
avoid warning.
* wcsmbs/Makefile (routines): Add wcscasecmp and wcsncase.
* wcsmbs/wchar.h: Add prototypes for wcscasecmp and wcsncase.
* wcsmbs/wcscasecmp.c: New file.
* wcsmbs/wcsncase.c: New file.
* stdlib/strtol.c: Define wide character quad word functions as
wcstoll and wcstoull and normal versions as strtoll and strtoull.
* wcsmbs/wchar.h: Add prototypes for wcstoll and wcstoull.
* wcsmbs/wcstoq: Renamed to wcstoll.c.
* wcsmbs/wcstouq: Renamed to wcstoull.c.
* wcsmbs/wcstoll.c: Renamed from wcstoq.c. Make wcstoq a weak
alias of wcstoll.
* wcsmbs/wcstoull.c: Renamed from wcstouq.c. Make wcstouq a weak
alias of wcstoull.
* wcsmbs/Makefile (routines): Replace wcstoq and wcstouq by
wcstoll and wcstoull respectively.
* stdlib/strtoq.c: Rename to strtoll.c.
* stdlib/strtouq.c: Rename to strtoull.c.
* stdlib/strtoll.c: Renamed from strtoq.c. Make strtoq a weak
alias of strtoll.
* stdlib/strtoll.c: Renamed from strtouq.c. Make strtouq a weak
alias of strtoull.
* stdlib/Makefile (routines): Replace strtoq and strtouq by
strtoll and strtoull respectively.
* stdio-common/vfscanf.c: Don't use __strtoq_internal and
__strtouq_internal but instead __strtoll_internal and
__strtoull_internal respectively.
* stdlib/stdlib.h (strtoq): Use __internal_strtoll in inline version.
(strtouq): Similar with __internal_strtoull.
* wcsmbs/wchar.h (wcstoq): Use __internal_wcstoll in inline version.
(wcstouq): Similar with __internal_wcstoull.
1997-02-23 04:38 Ulrich Drepper <drepper@cygnus.com>
* stdlib/strtol.c (STRTOL): It is not illegal to parse a minus
sign in the strtouXX functions. The results gets simply negated.
* stdio-common/tstscanf.c: Add testcase for above case.
* stdlib/tst-strtol.c: Correct tests.
* manual/stdio-fp.c: New file. Generate output for example program
in stdio.texi.
* stdio-common/Makefile (routines): Add printf_fphex.
* stdio-common/vfprintf.c: Add handling of %a and %A specifier.
* stdio-common/printf_fphex.c: New file. Implement %a and %A
specifier.
1997-02-22 03:01 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/unix/sysv/linux/timebits.h (CLK_TCK): Don't defined if
__STRICT_ANSI__.
* math/math.h: Prevent definition of struct exception when using
C++.
1997-02-22 01:45 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/unix/syscalls.list: Dup takes only one argument.
Reported by Greg McGary.
1997-02-21 00:22 Miles Bader <miles@gnu.ai.mit.edu>
1997-02-20 01:28 Miles Bader <miles@gnu.ai.mit.edu>
1997-02-19 13:56 Miles Bader <miles@gnu.ai.mit.edu>
1997-02-18 15:39 Miles Bader <miles@gnu.ai.mit.edu>
1997-02-17 10:58 Miles Bader <miles@gnu.ai.mit.edu>
1997-02-15 10:23 Miles Bader <miles@gnu.ai.mit.edu>
(mutex_lock, mutex_unlock, mutex_trylock): Defined in terms of
__mutex_*.
(mutex_t): Type removed & replaced by new macro.
(tsd_key_t): Typedef to int instead of pthread_key_t.
(tsd_key_create, tsd_setspecific, tsd_getspecific): New macros.
(__pthread_initialize): New macro, work around assumption of pthreads.
* sysdeps/mach/hurd/i386/init-first.c (__libc_argv, __libc_argc):
__hurd_sigthread_stack_end, __hurd_sigthread_stack_variables,
__hurd_threadvar_max, __hurd_threadvar_stack_offset,
__hurd_threadvar_stack_mask): Variables removed.
1997-02-14 14:07 Miles Bader <miles@gnu.ai.mit.edu>
* hurd/hurd.h (_hurd_pids_changed_stamp, _hurd_pids_changed_sync):
1997-02-24 17:06 Geoffrey Keating <geoffk@discus.anu.edu.au>
* sysdeps/unix/sysv/linux/accept.S (NARGS): Describe number of
arguments taken, for sysdeps/unix/sysv/linux/powerpc/socket.S.
* sysdeps/unix/sysv/linux/bind.S: Likewise.
* sysdeps/unix/sysv/linux/connect.S: Likewise.
* sysdeps/unix/sysv/linux/getpeername.S: Likewise.
* sysdeps/unix/sysv/linux/getsockname.S: Likewise.
* sysdeps/unix/sysv/linux/getsockopt.S: Likewise.
* sysdeps/unix/sysv/linux/listen.S: Likewise.
* sysdeps/unix/sysv/linux/recv.S: Likewise.
* sysdeps/unix/sysv/linux/recvfrom.S: Likewise.
* sysdeps/unix/sysv/linux/recvmsg.S: Likewise.
* sysdeps/unix/sysv/linux/send.S: Likewise.
* sysdeps/unix/sysv/linux/sendmsg.S: Likewise.
* sysdeps/unix/sysv/linux/sendto.S: Likewise.
* sysdeps/unix/sysv/linux/setsockopt.S: Likewise.
* sysdeps/unix/sysv/linux/shutdown.S: Likewise.
* sysdeps/unix/sysv/linux/socketpair.S: Likewise.
1997-02-15 04:51 Ulrich Drepper <drepper@cygnus.com>
Sun Dec 15 01:53:20 1996 Ulrich Drepper <drepper@cygnus.com>
* Makefile (subdirs): Change crypt to md5-crypt.
* crypt/Makefile, crypt/md5-crypt.c, crypt/md5.c, crypt/md5.h,
crypt/md5c-test.c, crypt/md5test.c: Move to new directory
md5-crypt.
* sysdeps/unix/sysv/linux/configure.in: Refer to linuxthreads and
crypt instead of LinuxThreads and des-crypt.
* Makefile (subdirs): Add nss back.
* sysdeps/unix/inet/Subdirs: Move nis to end of file to fulfill
dependencies.
* libio/iofclose.c: Implement fclose(NULL) as closing all streams.
* stdio-common/Makefile (routines): Add fcloseall.
* stdio-common/fcloseall.c: New file.
* sysdeps/generic/abort.c: Make implementation POSIX.1 compatible.
* sysdeps/mach/libc-lock.h: Add definition of __libc_lock_trylock.
* sysdeps/stub/libc-lock.h: Define __libc_lock_trylock to always
return 0.
* stdio-common/printf.h: Define MIN and MAX only if not already
defined.
* stdio-common/vfprintf.c: Set errno to EBADF if stream does not
allow writing. Required by POSIX.1.
* libio/libioP.h (CHECK_FILE): Use MAYBE_SET_EINVAL instead of
assignment.
* interp.c: Update copyright.
* libio/clearerr.c: Likewise.
* libio/ioseekoff.c: Likewise.
* libio/ioseekpos.c: Likewise.
* stdio/fclose.c: Likewise.
* stdio/fflus.c: Likewise.
* libio/libio.h [!_IO_MTSAFE_IO]: Define _IO_cleanup_region_start
and _IO_cleanup_region_end as empty.
* libio/fgetc.c: Use _IO_cleanup_region_start and
_IO_cleanup_region_end instead of __libc_cleanup_region_start and
__libc_cleanup_region_end.
* libio/fputc.c: Likewise.
* libio/freopen.c: Likewise.
* libio/fseek.c: Likewise.
* libio/getc.c: Likewise.
* libio/getchar.c: Likewise.
* libio/iofclose.c: Likewise.
* libio/iofflush.c: Likewise.
* libio/iofgetpos.c: Likewise.
* libio/iofgets.c: Likewise.
* libio/iofputs.c: Likewise.
* libio/iofread.c: Likewise.
* libio/iofsetpos.c: Likewise.
* libio/ioftell.c: Likewise.
* libio/iofwrite.c: Likewise.
* libio/iogetdelim.c: Likewise.
* libio/iogets.c: Likewise.
* libio/ioputs.c: Likewise.
* libio/iosetbuffer.c: Likewise.
* libio/iosetvbuf.c: Likewise.
* libio/ioungetc.c: Likewise.
* libio/iovspintf.c: Use cleanup handler to make sure no dangling
locks can stay over.
* libio/iovsscanf.c: Likewise.
* libio/genops.c: Use _IO_lock_init_recursive and _IO_lock_fini
instead of __libc_lock_init_recursive and __libc_lock_fini.
* libio/filedoalloc.c: Only use __isatty when compiling GNU libc.
Otherwise use isatty.
* libio/fileops.c: Likewise for __open and open.
* login/utmp_file.c (getutent_r_file): Use fcntl instead of
flock.
* nis/ypclnt.h: Add more casts to prevent warnings.
* nss/Makefile (services): Remove dns.
(libnss_dns, libnss_dns-inhibit-o): Remove definition.
($(objpfx)libnss_dns.so): Removed.
* nss/nss_dns/dns-host.c, nss/nss_dns/dns-network.c: Moved to...
* resolv/nss_dns: ...here.
* resolv/Makefile (extra-libs): Add libnss_dns.
(libnss_dns-routines, libnss_dns-inhibit-o): Define as in
nss/Makefile.
* nss/XXX-lookup.c: Call __nss_database_lookup with new argument
specifying alternate name for entry in /etc/nsswitch.conf
* nss/nsswitch.c: If no entry with primary name is found in
/etc/nsswitch.conf try alternate name if given.
* nss/nsswitch.h: Add new parameter in prototype for
__nss_database_lookup.
* nss/spwd-lookup.c: Provide alternative entry name to look for.
This makes our NSS compatible with Solaris' nsswitch.conf files.
* string/tst-strlen.c: Change all counting variables to type size_t
to prevent warnings.
* sysdeps/posix/fpathconf.c: Update copyright.
* sysdeps/posix/pathconf.c: Don't call fpathconf to do the work.
Opening the file at this path may fail if it is a FIFO or pipe.
These changes make the time implementation POSIX.1 compliant.
* time/localtime.c (__localtime_r): Always call __tzset not only
if __tzset_run is zero.
* time/strftime.c: Add definition of memset_space to help to
reduce for systems which have memset.
(strftime): Don't use tm_zone member of argument for zone name.
Instead always use tzname[].
Call tzset() as required by POSIX.1 before any action.
* time/tzset.c (tzset): Set tzname[] as required by POSIX.1.
Remove global variable __tzset_run. __tzset is now called always
when a dependent function is used.
(__tzset): Caching happens based on the contents of the
environment variable TZ.
Fri Dec 13 01:06:52 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* sysdeps/unix/sysv/linux/paths.h: Add _PATH_KLOG.
Thu Dec 12 09:16:35 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* rellns-sh: Correctly handle a relative source file name.
Wed Dec 11 19:18:40 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* login/utmp_file.c (setutent_file): Seek back to beginning of the
file if resetting.
Thu Dec 12 16:39:12 1996 Thomas Bushnell, n/BSG <thomas@gnu.ai.mit.edu>
* hurd/hurdinit.c (map0): Delete function. Don't do this on
_hurd_preinit_hook.
* hurd/hurdstartup.c (_hurd_startup): Map page zero redzone here.
Sun Oct 13 22:52:56 1996 Ulrich Drepper <drepper@cygnus.com>
* shlib-versions: Add version number/name for ld.so.
* Makeconfig: Move definition of rtld-installed-name after
inclusion of soversions.mk.
Don't add . before version number from shlib-versions file when
when name does not start with digit. This is needed for ld.so.
Sat Oct 12 20:31:58 1996 Richard Henderson <rth@tamu.edu>
* libio/iogets.c: Warn when gets used.
* stdio/gets.c: Strengthen the warning.
Sat Oct 12 23:10:43 1996 Ulrich Drepper <drepper@cygnus.com>
* libio/Makefile [_LIBC_REENTRANT] (routines): Add peekc.
* libio/libio.h: Add prototypes for _IO_getc, _IO_putc, _IO_feof,
_IO_ferror, _IO_peekc_locked, and _IO_ftrylockfile.
Remove prototypes for _IO_getc_locked and _IO_putc_locked.
[_IO_MTSAFE_IO]: Add weak aliases for _IO_flockfile and
_IO_funlockfile.
[! _IO_MTSAFE_IO]: Define _IO_ftrylockfile as empty.
Define _IO_getc, _IO_peekc, _IO_putc, _IO_feof, _IO_ferror to
appropriate values according to __USE_REENTRANT.
* libio/stdio.h: Add prototype for ftrylockfile.
[!_LIBC]: Define getc_locked, getchar_locked, putchar_locked,
getc, getchar, putc, and putchar using _IO_* names.
* libio/feof.c: Rename to _IO_feof and make feof weak alias.
* libio/ferror.c: Rename to _IO_ferror and make ferror weak alias.
* libio/getc.c: Rename to _IO_getc and make getc weak alias.
* libio/putc.c: Rename to _IO_putc and make putc weak alias.
* libio/putc_u.c: Don't define alias _IO_putc_unlocked.
* libio/peekc.c: New file.
* stdio-common/vfprintf.c (vfprintf): Unconditionally call
__flockfile.
* sysdeps/stub/locfile.c [USE_IN_LIBIO]: Also define _IO_* names.
* crypt/Makefile (tests): Add md5test and md5c-test.
* crypt/md5-crypt.c: Correct various error. Now md5_process_bytes
is called, the buffer limit is honoured and a loop in a inner
loop is corrected.
* crypt/md5.h (struct md5_ctx): Add new fields.
Add prototypes for new functions.
* crypt/md5.c (md5_init_ctx): Initialize new fields.
(md5_finish_ctx): New function. Like md5_read_ctx but before
perform correct finalization.
(md5_process_bytes): New function. Similar to md5_proces_block,
but does not require input size to be multiple of 64.
(md5_stream): Rewrite using md5_process_bytes and md5_finish_ctx.
(md5_buffer): Likewise.
(md5_process_block): Count number of bytes.
* crypt/md5test.c: New file. Test program for MD5 functions.
* crypt/md5c-test.c: New file: Test program for MD5 crypt
function.
* po/fr.po: Update.
* time/strptime.c: Recognize %s, %u, %g, and %G format.
* posix/getopt.c: Add some more casts and initializations to
prevent warnings.
Sat Oct 12 16:15:29 1996 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/unix/sysv/linux/speed.c (speeds): Removed. We provide
an extra function to provide this functionality.
(cfgetospeed): Simply return masked value.
(cfsetospeed): Don't use speeds array and so we can simply test
the value of SPEED for illegal values.
* termios/cfsetspeed.c: Rewrite. We convert here between the
real values and the B* constants.
Changes suggested by Uwe Ohse <uwe@tirka.gun.de>.
Fri Oct 11 21:45:34 1996 Andreas Jaeger <aj@arthur.pfalz.de>
* locale/programs/xstrdup.c: Define prototypes.
* locale/programs/xmalloc.c: Likewise.
* stdio-common/xbug.c (main): Change definition to avoid warning.
Fri Oct 11 23:36:31 1996 Miles Bader <miles@gnu.ai.mit.edu>
* db/hash/hash.c (__hash_open): Correctly test for a read-write db.
Joseph Myers