mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 06:50:07 +00:00
1711991592
_IO_MTSAFE_IO controls whether stdio is *built* with support for
multithreading. In the distant past it might also have worked as a
feature selection macro, allowing library *users* to select
thread-safe or lock-free stdio at application build time, I haven't
done the archaeology. Nowadays, defining _IO_MTSAFE_IO while using
the installed headers, or in _ISOMAC mode, will cause libio.h to throw
syntax errors.
This patch removes _IO_MTSAFE_IO from the public headers
(specifically, from libio/libio.h). The most important thing it
controlled in there was whether libio.h defines _IO_lock_t itself or
expects stdio-lock.h to have done it, and we do still need a
inter-header communication macro for that, because stdio-lock.h can
only define _IO_lock_t as a typedef. I've invented
_IO_lock_t_defined, which is defined by both versions of stdio-lock.h.
_IO_MTSAFE_IO also controlled the definitions of a handful of macros
that _might_ count as part of the public libio.h interface. They are
now unconditionally given their non-_IO_MTSAFE_IO definition in
libio/libio.h, and include/libio.h redefines them with the
_IO_MTSAFE_IO definition. This should minimize the odds of breaking
old software that actually uses those macros.
I suspect that this entire mechanism is vestigial, and that glibc
won't build anymore if you *don't* define _IO_MTSAFE_IO, but that's
another patchset. The bulk of libio.h is internal-use-only stuff that
no longer makes sense to expose (libstdc++ gave up on making a FILE
the same object as a C++ filebuf *decades* ago) but that, too, is
another patchset.
* libio/libio.h: Condition dummy definition of _IO_lock_t on
_IO_lock_t_defined, not _IO_MTSAFE_IO. Unconditionally use the
non-_IO_MTSAFE_IO definitions for _IO_peekc, _IO_flockfile,
_IO_funlockfile, and _IO_ftrylockfile. Only define
_IO_cleanup_region_start and _IO_cleanup_region_end if not
already defined.
* include/libio.h: If _IO_MTSAFE_IO is defined, redefine
_IO_peekc, _IO_flockfile, _IO_funlockfile, and _IO_ftrylockfile
appropriately.
* sysdeps/generic/stdio-lock.h, sysdeps/nptl/stdio-lock.h:
Define _IO_lock_t_defined after defining _IO_lock_t.
72 lines
2.6 KiB
C
72 lines
2.6 KiB
C
/* Thread package specific definitions of stream lock type. Generic version.
|
|
Copyright (C) 2000-2017 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _STDIO_LOCK_H
|
|
#define _STDIO_LOCK_H 1
|
|
|
|
#include <libc-lock.h>
|
|
|
|
__libc_lock_define_recursive (typedef, _IO_lock_t)
|
|
#define _IO_lock_t_defined 1
|
|
|
|
/* We need recursive (counting) mutexes. */
|
|
#ifdef _LIBC_LOCK_RECURSIVE_INITIALIZER
|
|
# define _IO_lock_initializer _LIBC_LOCK_RECURSIVE_INITIALIZER
|
|
#elif _IO_MTSAFE_IO
|
|
#error libio needs recursive mutexes for _IO_MTSAFE_IO
|
|
#endif
|
|
|
|
#define _IO_lock_init(_name) __libc_lock_init_recursive (_name)
|
|
#define _IO_lock_fini(_name) __libc_lock_fini_recursive (_name)
|
|
#define _IO_lock_lock(_name) __libc_lock_lock_recursive (_name)
|
|
#define _IO_lock_trylock(_name) __libc_lock_trylock_recursive (_name)
|
|
#define _IO_lock_unlock(_name) __libc_lock_unlock_recursive (_name)
|
|
|
|
|
|
#define _IO_cleanup_region_start(_fct, _fp) \
|
|
__libc_cleanup_region_start (((_fp)->_flags & _IO_USER_LOCK) == 0, _fct, _fp)
|
|
#define _IO_cleanup_region_start_noarg(_fct) \
|
|
__libc_cleanup_region_start (1, _fct, NULL)
|
|
#define _IO_cleanup_region_end(_doit) \
|
|
__libc_cleanup_region_end (_doit)
|
|
|
|
#if defined _LIBC && IS_IN (libc)
|
|
|
|
# ifdef __EXCEPTIONS
|
|
# define _IO_acquire_lock(_fp) \
|
|
do { \
|
|
_IO_FILE *_IO_acquire_lock_file \
|
|
__attribute__((cleanup (_IO_acquire_lock_fct))) \
|
|
= (_fp); \
|
|
_IO_flockfile (_IO_acquire_lock_file);
|
|
# define _IO_acquire_lock_clear_flags2(_fp) \
|
|
do { \
|
|
_IO_FILE *_IO_acquire_lock_file \
|
|
__attribute__((cleanup (_IO_acquire_lock_clear_flags2_fct))) \
|
|
= (_fp); \
|
|
_IO_flockfile (_IO_acquire_lock_file);
|
|
# else
|
|
# define _IO_acquire_lock(_fp) _IO_acquire_lock_needs_exceptions_enabled
|
|
# define _IO_acquire_lock_clear_flags2(_fp) _IO_acquire_lock (_fp)
|
|
# endif
|
|
# define _IO_release_lock(_fp) ; } while (0)
|
|
|
|
#endif
|
|
|
|
#endif /* stdio-lock.h */
|