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Current implementation (sysdeps/nptl/fork.c) replicates the atfork
handlers list backward to invoke the child handlers after fork/clone
syscall.
The internal atfork handlers is implemented as a single-linked list
so a lock-free algorithm can be used, trading fork mulithread call
performance for some code complexity and dynamic stack allocation
(since the backwards list should not fail).
This patch refactor it to use a dynarary instead of a linked list.
It simplifies the external variables need to be exported and also
the internal atfork handler member definition.
The downside is a serialization of fork call in multithread, since to
operate on the dynarray the internal lock should be used. However
as noted by Florian, it already acquires external locks for malloc
and libio so it is already hitting some lock contention. Besides,
posix_spawn should be faster and more scalable to run external programs
in multithread environments.
Checked on x86_64-linux-gnu.
* nptl/Makefile (routines): Remove unregister-atfork.
* nptl/register-atfork.c (fork_handler_pool): Remove variable.
(fork_handler_alloc): Remove function.
(fork_handlers, fork_handler_init): New variables.
(__fork_lock): Rename to atfork_lock.
(__register_atfork, __unregister_atfork, libc_freeres_fn): Rewrite
to use a dynamic array to add/remove atfork handlers.
* sysdeps/nptl/fork.c (__libc_fork): Likewise.
* sysdeps/nptl/fork.h (__fork_lock, __fork_handlers, __linkin_atfork):
Remove declaration.
(fork_handler): Remove next, refcntr, and need_signal member.
(__run_fork_handler_type): New enum.
(__run_fork_handlers): New prototype.
* sysdeps/nptl/libc-lockP.h (__libc_atfork): Remove declaration.
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* All files with FSF copyright notices: Update copyright dates
using scripts/update-copyrights.
* locale/programs/charmap-kw.h: Regenerated.
* locale/programs/locfile-kw.h: Likewise.
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* sysdeps/mach/hurd/libc-lock.h (_LIBC_LOCK_INITIALIZER): Define.
(__libc_lock_define_initialized): Use it.
* sysdeps/nptl/libc-lockP.h (_LIBC_LOCK_INITIALIZER): Define.
* malloc/arena.c (list_lock): Use _LIBC_LOCK_INITIALIZER.
* malloc/malloc.c (main_arena): Likewise.
* sysdeps/generic/malloc-machine.h (MUTEX_INITIALIZER): Remove.
* sysdeps/nptl/malloc-machine.h (MUTEX_INITIALIZER): Remove.
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This patch references __pthread_setcancelstate instead of
pthread_setcancelstate in libc.a.
[BZ #18970]
* misc/error.c (error): Replace pthread_setcancelstate with
__pthread_setcancelstate.
(error_at_line): Likewise.
* posix/wordexp.c (parse_comm): Likewise.
* stdlib/fmtmsg.c (fmtmsg): Likewise.
* nptl/forward.c (pthread_setcancelstate): Renamed to ...
(__pthread_setcancelstate): This.
(pthread_setcancelstate): Add an alias.
* nptl/nptl-init.c (pthread_functions): Replace
ptr_pthread_setcancelstate with ptr___pthread_setcancelstate.
* sysdeps/nptl/pthread-functions.h (pthread_functions): Likewise.
* nptl/pthreadP.h (__pthread_setcancelstate): Mark it with
hidden_proto.
* nptl/pthread_setcancelstate.c (__pthread_setcancelstate): Mark
it with hidden_def.
* sysdeps/nptl/libc-lockP.h (__pthread_setcancelstate): New.
(pthread_setcancelstate): Renamed to ...
(__pthread_setcancelstate): This.
* sysdeps/unix/sysv/linux/fatal-prepare.h (FATAL_PREPARE): Use
__libc_ptf_call with __pthread_setcancelstate.
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It was noted in
<https://sourceware.org/ml/libc-alpha/2012-09/msg00305.html> that the
bits/*.h naming scheme should only be used for installed headers.
This patch renames bits/libc-lock.h to plain libc-lock.h and
bits/libc-lockP.h to plain libc-lockP.h to follow that convention.
Note that I don't know where libc-lockP.h comes from for Hurd (the
Hurd libc-lock.h includes libc-lockP.h, but the only libc-lockP.h in
the glibc source tree is for NPTL) - some unmerged patch? - but I
updated the #include in the Hurd libc-lock.h anyway.
Tested for x86_64 (testsuite, and that installed stripped shared
libraries are unchanged by the patch).
[BZ #14912]
* bits/libc-lock.h: Move to ...
* sysdeps/generic/libc-lock.h: ...here.
(_BITS_LIBC_LOCK_H): Rename macro to _LIBC_LOCK_H.
* sysdeps/mach/hurd/bits/libc-lock.h: Move to ...
* sysdeps/mach/hurd/libc-lock.h: ...here.
(_BITS_LIBC_LOCK_H): Rename macro to _LIBC_LOCK_H.
[_LIBC]: Include <libc-lockP.h> instead of <bits/libc-lockP.h>.
* sysdeps/mach/bits/libc-lock.h: Move to ...
* sysdeps/mach/libc-lock.h: ...here.
(_BITS_LIBC_LOCK_H): Rename macro to _LIBC_LOCK_H.
* sysdeps/nptl/bits/libc-lock.h: Move to ...
* sysdeps/nptl/libc-lock.h: ...here.
(_BITS_LIBC_LOCK_H): Rename macro to _LIBC_LOCK_H.
* sysdeps/nptl/bits/libc-lockP.h: Move to ...
* sysdeps/nptl/libc-lockP.h: ...here.
(_BITS_LIBC_LOCKP_H): Rename macro to _LIBC_LOCKP_H.
* crypt/crypt_util.c: Include <libc-lock.h> instead of
<bits/libc-lock.h>.
* dirent/scandir-tail.c: Likewise.
* dlfcn/dlerror.c: Likewise.
* elf/dl-close.c: Likewise.
* elf/dl-iteratephdr.c: Likewise.
* elf/dl-lookup.c: Likewise.
* elf/dl-open.c: Likewise.
* elf/dl-support.c: Likewise.
* elf/dl-writev.h: Likewise.
* elf/rtld.c: Likewise.
* grp/fgetgrent.c: Likewise.
* gshadow/fgetsgent.c: Likewise.
* gshadow/sgetsgent.c: Likewise.
* iconv/gconv_conf.c: Likewise.
* iconv/gconv_db.c: Likewise.
* iconv/gconv_dl.c: Likewise.
* iconv/gconv_int.h: Likewise.
* iconv/gconv_trans.c: Likewise.
* include/link.h: Likewise.
* inet/getnameinfo.c: Likewise.
* inet/getnetgrent.c: Likewise.
* inet/getnetgrent_r.c: Likewise.
* intl/bindtextdom.c: Likewise.
* intl/dcigettext.c: Likewise.
* intl/finddomain.c: Likewise.
* intl/gettextP.h: Likewise.
* intl/loadmsgcat.c: Likewise.
* intl/localealias.c: Likewise.
* intl/textdomain.c: Likewise.
* libidn/idn-stub.c: Likewise.
* libio/libioP.h: Likewise.
* locale/duplocale.c: Likewise.
* locale/freelocale.c: Likewise.
* locale/newlocale.c: Likewise.
* locale/setlocale.c: Likewise.
* login/getutent_r.c: Likewise.
* login/getutid_r.c: Likewise.
* login/getutline_r.c: Likewise.
* login/utmp-private.h: Likewise.
* login/utmpname.c: Likewise.
* malloc/mtrace.c: Likewise.
* misc/efgcvt.c: Likewise.
* misc/error.c: Likewise.
* misc/fstab.c: Likewise.
* misc/getpass.c: Likewise.
* misc/mntent.c: Likewise.
* misc/syslog.c: Likewise.
* nis/nis_call.c: Likewise.
* nis/nis_callback.c: Likewise.
* nis/nss-default.c: Likewise.
* nis/nss_compat/compat-grp.c: Likewise.
* nis/nss_compat/compat-initgroups.c: Likewise.
* nis/nss_compat/compat-pwd.c: Likewise.
* nis/nss_compat/compat-spwd.c: Likewise.
* nis/nss_nis/nis-alias.c: Likewise.
* nis/nss_nis/nis-ethers.c: Likewise.
* nis/nss_nis/nis-grp.c: Likewise.
* nis/nss_nis/nis-hosts.c: Likewise.
* nis/nss_nis/nis-network.c: Likewise.
* nis/nss_nis/nis-proto.c: Likewise.
* nis/nss_nis/nis-pwd.c: Likewise.
* nis/nss_nis/nis-rpc.c: Likewise.
* nis/nss_nis/nis-service.c: Likewise.
* nis/nss_nis/nis-spwd.c: Likewise.
* nis/nss_nisplus/nisplus-alias.c: Likewise.
* nis/nss_nisplus/nisplus-ethers.c: Likewise.
* nis/nss_nisplus/nisplus-grp.c: Likewise.
* nis/nss_nisplus/nisplus-hosts.c: Likewise.
* nis/nss_nisplus/nisplus-initgroups.c: Likewise.
* nis/nss_nisplus/nisplus-network.c: Likewise.
* nis/nss_nisplus/nisplus-proto.c: Likewise.
* nis/nss_nisplus/nisplus-pwd.c: Likewise.
* nis/nss_nisplus/nisplus-rpc.c: Likewise.
* nis/nss_nisplus/nisplus-service.c: Likewise.
* nis/nss_nisplus/nisplus-spwd.c: Likewise.
* nis/ypclnt.c: Likewise.
* nptl/libc_pthread_init.c: Likewise.
* nss/getXXbyYY.c: Likewise.
* nss/getXXent.c: Likewise.
* nss/getXXent_r.c: Likewise.
* nss/nss_db/db-XXX.c: Likewise.
* nss/nss_db/db-netgrp.c: Likewise.
* nss/nss_db/nss_db.h: Likewise.
* nss/nss_files/files-XXX.c: Likewise.
* nss/nss_files/files-alias.c: Likewise.
* nss/nsswitch.c: Likewise.
* posix/regex_internal.h: Likewise.
* posix/wordexp.c: Likewise.
* pwd/fgetpwent.c: Likewise.
* resolv/res_hconf.c: Likewise.
* resolv/res_libc.c: Likewise.
* shadow/fgetspent.c: Likewise.
* shadow/lckpwdf.c: Likewise.
* shadow/sgetspent.c: Likewise.
* socket/opensock.c: Likewise.
* stdio-common/reg-modifier.c: Likewise.
* stdio-common/reg-printf.c: Likewise.
* stdio-common/reg-type.c: Likewise.
* stdio-common/vfprintf.c: Likewise.
* stdio-common/vfscanf.c: Likewise.
* stdlib/abort.c: Likewise.
* stdlib/cxa_atexit.c: Likewise.
* stdlib/fmtmsg.c: Likewise.
* stdlib/random.c: Likewise.
* stdlib/setenv.c: Likewise.
* string/strsignal.c: Likewise.
* sunrpc/auth_none.c: Likewise.
* sunrpc/bindrsvprt.c: Likewise.
* sunrpc/create_xid.c: Likewise.
* sunrpc/key_call.c: Likewise.
* sunrpc/rpc_thread.c: Likewise.
* sysdeps/arm/backtrace.c: Likewise.
* sysdeps/generic/ldsodefs.h: Likewise.
* sysdeps/generic/stdio-lock.h: Likewise.
* sysdeps/generic/unwind-dw2-fde.c: Likewise.
* sysdeps/i386/backtrace.c: Likewise.
* sysdeps/ieee754/ldbl-opt/nldbl-compat.c: Likewise.
* sysdeps/m68k/backtrace.c: Likewise.
* sysdeps/mach/hurd/cthreads.c: Likewise.
* sysdeps/mach/hurd/dirstream.h: Likewise.
* sysdeps/mach/hurd/malloc-machine.h: Likewise.
* sysdeps/nptl/malloc-machine.h: Likewise.
* sysdeps/nptl/stdio-lock.h: Likewise.
* sysdeps/posix/dirstream.h: Likewise.
* sysdeps/posix/getaddrinfo.c: Likewise.
* sysdeps/posix/system.c: Likewise.
* sysdeps/pthread/aio_suspend.c: Likewise.
* sysdeps/s390/s390-32/backtrace.c: Likewise.
* sysdeps/s390/s390-64/backtrace.c: Likewise.
* sysdeps/unix/sysv/linux/check_pf.c: Likewise.
* sysdeps/unix/sysv/linux/if_index.c: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/getutent_r.c: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/getutid_r.c: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/getutline_r.c: Likewise.
* sysdeps/unix/sysv/linux/shm-directory.c: Likewise.
* sysdeps/unix/sysv/linux/system.c: Likewise.
* sysdeps/x86_64/backtrace.c: Likewise.
* time/alt_digit.c: Likewise.
* time/era.c: Likewise.
* time/tzset.c: Likewise.
* wcsmbs/wcsmbsload.c: Likewise.
* nptl/tst-initializers1.c (do_test): Refer to <libc-lock.h>
instead of <bits/libc-lock.h> in comment.
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