mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-30 10:45:40 +03:00
2b778ceb40
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 6694 files FOO. I then removed trailing white space from benchtests/bench-pthread-locks.c and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this diagnostic from Savannah: remote: *** pre-commit check failed ... remote: *** error: lines with trailing whitespace found remote: error: hook declined to update refs/heads/master
188 lines
6.7 KiB
C++
188 lines
6.7 KiB
C++
/* libc-internal interface for mutex locks. NPTL version.
|
|
Copyright (C) 1996-2021 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; see the file COPYING.LIB. If
|
|
not, see <https://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _LIBC_LOCK_H
|
|
#define _LIBC_LOCK_H 1
|
|
|
|
#include <pthread.h>
|
|
#define __need_NULL
|
|
#include <stddef.h>
|
|
|
|
|
|
/* Mutex type. */
|
|
#if defined _LIBC || defined _IO_MTSAFE_IO
|
|
# if (!IS_IN (libc) && !IS_IN (libpthread)) || !defined _LIBC
|
|
typedef struct { pthread_mutex_t mutex; } __libc_lock_recursive_t;
|
|
# else
|
|
typedef struct { int lock; int cnt; void *owner; } __libc_lock_recursive_t;
|
|
# endif
|
|
#else
|
|
typedef struct __libc_lock_recursive_opaque__ __libc_lock_recursive_t;
|
|
#endif
|
|
|
|
/* Define a lock variable NAME with storage class CLASS. The lock must be
|
|
initialized with __libc_lock_init before it can be used (or define it
|
|
with __libc_lock_define_initialized, below). Use `extern' for CLASS to
|
|
declare a lock defined in another module. In public structure
|
|
definitions you must use a pointer to the lock structure (i.e., NAME
|
|
begins with a `*'), because its storage size will not be known outside
|
|
of libc. */
|
|
#define __libc_lock_define_recursive(CLASS,NAME) \
|
|
CLASS __libc_lock_recursive_t NAME;
|
|
|
|
/* Define an initialized recursive lock variable NAME with storage
|
|
class CLASS. */
|
|
#if defined _LIBC && (IS_IN (libc) || IS_IN (libpthread))
|
|
# define __libc_lock_define_initialized_recursive(CLASS, NAME) \
|
|
CLASS __libc_lock_recursive_t NAME = _LIBC_LOCK_RECURSIVE_INITIALIZER;
|
|
# define _LIBC_LOCK_RECURSIVE_INITIALIZER \
|
|
{ LLL_LOCK_INITIALIZER, 0, NULL }
|
|
#else
|
|
# define __libc_lock_define_initialized_recursive(CLASS,NAME) \
|
|
CLASS __libc_lock_recursive_t NAME = _LIBC_LOCK_RECURSIVE_INITIALIZER;
|
|
# define _LIBC_LOCK_RECURSIVE_INITIALIZER \
|
|
{PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP}
|
|
#endif
|
|
|
|
/* Initialize a recursive mutex. */
|
|
#if defined _LIBC && (IS_IN (libc) || IS_IN (libpthread))
|
|
# define __libc_lock_init_recursive(NAME) \
|
|
((void) ((NAME) = (__libc_lock_recursive_t) _LIBC_LOCK_RECURSIVE_INITIALIZER))
|
|
#else
|
|
# define __libc_lock_init_recursive(NAME) \
|
|
do { \
|
|
if (__pthread_mutex_init != NULL) \
|
|
{ \
|
|
pthread_mutexattr_t __attr; \
|
|
__pthread_mutexattr_init (&__attr); \
|
|
__pthread_mutexattr_settype (&__attr, PTHREAD_MUTEX_RECURSIVE_NP); \
|
|
__pthread_mutex_init (&(NAME).mutex, &__attr); \
|
|
__pthread_mutexattr_destroy (&__attr); \
|
|
} \
|
|
} while (0)
|
|
#endif
|
|
|
|
/* Finalize recursive named lock. */
|
|
#if defined _LIBC && (IS_IN (libc) || IS_IN (libpthread))
|
|
# define __libc_lock_fini_recursive(NAME) ((void) 0)
|
|
#else
|
|
# define __libc_lock_fini_recursive(NAME) \
|
|
__libc_maybe_call (__pthread_mutex_destroy, (&(NAME).mutex), 0)
|
|
#endif
|
|
|
|
/* Lock the recursive named lock variable. */
|
|
#if defined _LIBC && (IS_IN (libc) || IS_IN (libpthread))
|
|
# define __libc_lock_lock_recursive(NAME) \
|
|
do { \
|
|
void *self = THREAD_SELF; \
|
|
if ((NAME).owner != self) \
|
|
{ \
|
|
lll_lock ((NAME).lock, LLL_PRIVATE); \
|
|
(NAME).owner = self; \
|
|
} \
|
|
++(NAME).cnt; \
|
|
} while (0)
|
|
#else
|
|
# define __libc_lock_lock_recursive(NAME) \
|
|
__libc_maybe_call (__pthread_mutex_lock, (&(NAME).mutex), 0)
|
|
#endif
|
|
|
|
/* Try to lock the recursive named lock variable. */
|
|
#if defined _LIBC && (IS_IN (libc) || IS_IN (libpthread))
|
|
# define __libc_lock_trylock_recursive(NAME) \
|
|
({ \
|
|
int result = 0; \
|
|
void *self = THREAD_SELF; \
|
|
if ((NAME).owner != self) \
|
|
{ \
|
|
if (lll_trylock ((NAME).lock) == 0) \
|
|
{ \
|
|
(NAME).owner = self; \
|
|
(NAME).cnt = 1; \
|
|
} \
|
|
else \
|
|
result = EBUSY; \
|
|
} \
|
|
else \
|
|
++(NAME).cnt; \
|
|
result; \
|
|
})
|
|
#else
|
|
# define __libc_lock_trylock_recursive(NAME) \
|
|
__libc_maybe_call (__pthread_mutex_trylock, (&(NAME).mutex), 0)
|
|
#endif
|
|
|
|
/* Unlock the recursive named lock variable. */
|
|
#if defined _LIBC && (IS_IN (libc) || IS_IN (libpthread))
|
|
/* We do no error checking here. */
|
|
# define __libc_lock_unlock_recursive(NAME) \
|
|
do { \
|
|
if (--(NAME).cnt == 0) \
|
|
{ \
|
|
(NAME).owner = NULL; \
|
|
lll_unlock ((NAME).lock, LLL_PRIVATE); \
|
|
} \
|
|
} while (0)
|
|
#else
|
|
# define __libc_lock_unlock_recursive(NAME) \
|
|
__libc_maybe_call (__pthread_mutex_unlock, (&(NAME).mutex), 0)
|
|
#endif
|
|
|
|
/* Note that for I/O cleanup handling we are using the old-style
|
|
cancel handling. It does not have to be integrated with C++ since
|
|
no C++ code is called in the middle. The old-style handling is
|
|
faster and the support is not going away. */
|
|
extern void _pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
|
|
void (*routine) (void *), void *arg);
|
|
extern void _pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
|
|
int execute);
|
|
|
|
/* Start critical region with cleanup. */
|
|
#define __libc_cleanup_region_start(DOIT, FCT, ARG) \
|
|
{ struct _pthread_cleanup_buffer _buffer; \
|
|
int _avail; \
|
|
if (DOIT) { \
|
|
_avail = PTFAVAIL (_pthread_cleanup_push_defer); \
|
|
if (_avail) { \
|
|
__libc_ptf_call_always (_pthread_cleanup_push_defer, (&_buffer, FCT, \
|
|
ARG)); \
|
|
} else { \
|
|
_buffer.__routine = (FCT); \
|
|
_buffer.__arg = (ARG); \
|
|
} \
|
|
} else { \
|
|
_avail = 0; \
|
|
}
|
|
|
|
/* End critical region with cleanup. */
|
|
#define __libc_cleanup_region_end(DOIT) \
|
|
if (_avail) { \
|
|
__libc_ptf_call_always (_pthread_cleanup_pop_restore, (&_buffer, DOIT));\
|
|
} else if (DOIT) \
|
|
_buffer.__routine (_buffer.__arg); \
|
|
}
|
|
|
|
|
|
/* Hide the definitions which are only supposed to be used inside libc in
|
|
a separate file. This file is not present in the installation! */
|
|
#ifdef _LIBC
|
|
# include "libc-lockP.h"
|
|
#endif
|
|
|
|
#endif /* libc-lock.h */
|