diff options
Diffstat (limited to 'nptl')
| -rw-r--r-- | nptl/ChangeLog | 10 | ||||
| -rw-r--r-- | nptl/sysdeps/pthread/bits/libc-lock.h | 404 | ||||
| -rw-r--r-- | nptl/sysdeps/pthread/bits/libc-lockP.h | 434 |
3 files changed, 448 insertions, 400 deletions
diff --git a/nptl/ChangeLog b/nptl/ChangeLog index 57a9b10d3c..4ca4c38d1c 100644 --- a/nptl/ChangeLog +++ b/nptl/ChangeLog @@ -1,3 +1,9 @@ +2012-03-06 Ulrich Drepper <drepper@gmail.com> + + * sysdeps/pthread/bits/libc-lock.h: Split information not needed in + installed headers... + * sysdeps/pthread/bits/libc-lockP.h: ...here. New file. + 2012-03-06 David S. Miller <davem@davemloft.net> * sysdeps/unix/sysv/linux/sparc/sem_post.c (__new_sem_post): Use @@ -6,8 +12,8 @@ 2012-02-27 David S. Miller <davem@davemloft.net> - * sysdeps/unix/sysv/linux/i386/bits/pthreadtypes.h: Don't refer to non-existing - __pthread_attr. + * sysdeps/unix/sysv/linux/i386/bits/pthreadtypes.h: Don't refer to + non-existing __pthread_attr. * sysdeps/unix/sysv/linux/powerpc/bits/pthreadtypes.h: Likewise. * sysdeps/unix/sysv/linux/s390/bits/pthreadtypes.h: Likewise. * sysdeps/unix/sysv/linux/sh/bits/pthreadtypes.h: Likewise. diff --git a/nptl/sysdeps/pthread/bits/libc-lock.h b/nptl/sysdeps/pthread/bits/libc-lock.h index 4d54e667de..02c0ae5f7e 100644 --- a/nptl/sysdeps/pthread/bits/libc-lock.h +++ b/nptl/sysdeps/pthread/bits/libc-lock.h @@ -24,42 +24,17 @@ #include <stddef.h> -/* Fortunately Linux now has a mean to do locking which is realtime - safe without the aid of the thread library. We also need no fancy - options like error checking mutexes etc. We only need simple - locks, maybe recursive. This can be easily and cheaply implemented - using futexes. We will use them everywhere except in ld.so since - ld.so might be used on old kernels with a different libc.so. */ -#ifdef _LIBC -# include <lowlevellock.h> -# include <tls.h> -# include <pthread-functions.h> -#endif - /* Mutex type. */ #if defined _LIBC || defined _IO_MTSAFE_IO # if (defined NOT_IN_libc && !defined IS_IN_libpthread) || !defined _LIBC -typedef pthread_mutex_t __libc_lock_t; typedef struct { pthread_mutex_t mutex; } __libc_lock_recursive_t; # else -typedef int __libc_lock_t; typedef struct { int lock; int cnt; void *owner; } __libc_lock_recursive_t; # endif -typedef struct { pthread_mutex_t mutex; } __rtld_lock_recursive_t; -# ifdef __USE_UNIX98 -typedef pthread_rwlock_t __libc_rwlock_t; -# else -typedef struct __libc_rwlock_opaque__ __libc_rwlock_t; -# endif #else -typedef struct __libc_lock_opaque__ __libc_lock_t; typedef struct __libc_lock_recursive_opaque__ __libc_lock_recursive_t; -typedef struct __libc_rwlock_opaque__ __libc_rwlock_t; #endif -/* Type for key to thread-specific data. */ -typedef pthread_key_t __libc_key_t; - /* 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 @@ -67,44 +42,8 @@ typedef pthread_key_t __libc_key_t; 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(CLASS,NAME) \ - CLASS __libc_lock_t NAME; -#define __libc_rwlock_define(CLASS,NAME) \ - CLASS __libc_rwlock_t NAME; #define __libc_lock_define_recursive(CLASS,NAME) \ CLASS __libc_lock_recursive_t NAME; -#define __rtld_lock_define_recursive(CLASS,NAME) \ - CLASS __rtld_lock_recursive_t NAME; - -/* Define an initialized lock variable NAME with storage class CLASS. - - For the C library we take a deeper look at the initializer. For - this implementation all fields are initialized to zero. Therefore - we don't initialize the variable which allows putting it into the - BSS section. (Except on PA-RISC and other odd architectures, where - initialized locks must be set to one due to the lack of normal - atomic operations.) */ - -#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread) -# if LLL_LOCK_INITIALIZER == 0 -# define __libc_lock_define_initialized(CLASS,NAME) \ - CLASS __libc_lock_t NAME; -# else -# define __libc_lock_define_initialized(CLASS,NAME) \ - CLASS __libc_lock_t NAME = LLL_LOCK_INITIALIZER; -# endif -#else -# if __LT_SPINLOCK_INIT == 0 -# define __libc_lock_define_initialized(CLASS,NAME) \ - CLASS __libc_lock_t NAME; -# else -# define __libc_lock_define_initialized(CLASS,NAME) \ - CLASS __libc_lock_t NAME = PTHREAD_MUTEX_INITIALIZER; -# endif -#endif - -#define __libc_rwlock_define_initialized(CLASS,NAME) \ - CLASS __libc_rwlock_t NAME = PTHREAD_RWLOCK_INITIALIZER; /* Define an initialized recursive lock variable NAME with storage class CLASS. */ @@ -125,63 +64,7 @@ typedef pthread_key_t __libc_key_t; {PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP} #endif -#define __rtld_lock_define_initialized_recursive(CLASS,NAME) \ - CLASS __rtld_lock_recursive_t NAME = _RTLD_LOCK_RECURSIVE_INITIALIZER; -#define _RTLD_LOCK_RECURSIVE_INITIALIZER \ - {PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP} - -#define __rtld_lock_initialize(NAME) \ - (void) ((NAME) = (__rtld_lock_recursive_t) _RTLD_LOCK_RECURSIVE_INITIALIZER) - -/* If we check for a weakly referenced symbol and then perform a - normal jump to it te code generated for some platforms in case of - PIC is unnecessarily slow. What would happen is that the function - is first referenced as data and then it is called indirectly - through the PLT. We can make this a direct jump. */ -#ifdef __PIC__ -# define __libc_maybe_call(FUNC, ARGS, ELSE) \ - (__extension__ ({ __typeof (FUNC) *_fn = (FUNC); \ - _fn != NULL ? (*_fn) ARGS : ELSE; })) -#else -# define __libc_maybe_call(FUNC, ARGS, ELSE) \ - (FUNC != NULL ? FUNC ARGS : ELSE) -#endif - -/* Call thread functions through the function pointer table. */ -#if defined SHARED && !defined NOT_IN_libc -# define PTFAVAIL(NAME) __libc_pthread_functions_init -# define __libc_ptf_call(FUNC, ARGS, ELSE) \ - (__libc_pthread_functions_init ? PTHFCT_CALL (ptr_##FUNC, ARGS) : ELSE) -# define __libc_ptf_call_always(FUNC, ARGS) \ - PTHFCT_CALL (ptr_##FUNC, ARGS) -#else -# define PTFAVAIL(NAME) (NAME != NULL) -# define __libc_ptf_call(FUNC, ARGS, ELSE) \ - __libc_maybe_call (FUNC, ARGS, ELSE) -# define __libc_ptf_call_always(FUNC, ARGS) \ - FUNC ARGS -#endif - - -/* Initialize the named lock variable, leaving it in a consistent, unlocked - state. */ -#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread) -# define __libc_lock_init(NAME) ((NAME) = LLL_LOCK_INITIALIZER, 0) -#else -# define __libc_lock_init(NAME) \ - __libc_maybe_call (__pthread_mutex_init, (&(NAME), NULL), 0) -#endif -#if defined SHARED && !defined NOT_IN_libc -/* ((NAME) = (__libc_rwlock_t) PTHREAD_RWLOCK_INITIALIZER, 0) is - inefficient. */ -# define __libc_rwlock_init(NAME) \ - (__builtin_memset (&(NAME), '\0', sizeof (NAME)), 0) -#else -# define __libc_rwlock_init(NAME) \ - __libc_maybe_call (__pthread_rwlock_init, (&(NAME), NULL), 0) -#endif - -/* Same as last but this time we initialize a recursive mutex. */ +/* Initialize a recursive mutex. */ #if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread) # define __libc_lock_init_recursive(NAME) \ ((NAME) = (__libc_lock_recursive_t) _LIBC_LOCK_RECURSIVE_INITIALIZER, 0) @@ -199,34 +82,6 @@ typedef pthread_key_t __libc_key_t; } while (0) #endif -#define __rtld_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) - -/* Finalize the named lock variable, which must be locked. It cannot be - used again until __libc_lock_init is called again on it. This must be - called on a lock variable before the containing storage is reused. */ -#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread) -# define __libc_lock_fini(NAME) ((void) 0) -#else -# define __libc_lock_fini(NAME) \ - __libc_maybe_call (__pthread_mutex_destroy, (&(NAME)), 0) -#endif -#if defined SHARED && !defined NOT_IN_libc -# define __libc_rwlock_fini(NAME) ((void) 0) -#else -# define __libc_rwlock_fini(NAME) \ - __libc_maybe_call (__pthread_rwlock_destroy, (&(NAME)), 0) -#endif - /* Finalize recursive named lock. */ #if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread) # define __libc_lock_fini_recursive(NAME) ((void) 0) @@ -235,19 +90,6 @@ typedef pthread_key_t __libc_key_t; __libc_maybe_call (__pthread_mutex_destroy, (&(NAME)), 0) #endif -/* Lock the named lock variable. */ -#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread) -# define __libc_lock_lock(NAME) \ - ({ lll_lock (NAME, LLL_PRIVATE); 0; }) -#else -# define __libc_lock_lock(NAME) \ - __libc_maybe_call (__pthread_mutex_lock, (&(NAME)), 0) -#endif -#define __libc_rwlock_rdlock(NAME) \ - __libc_ptf_call (__pthread_rwlock_rdlock, (&(NAME)), 0) -#define __libc_rwlock_wrlock(NAME) \ - __libc_ptf_call (__pthread_rwlock_wrlock, (&(NAME)), 0) - /* Lock the recursive named lock variable. */ #if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread) # define __libc_lock_lock_recursive(NAME) \ @@ -265,19 +107,6 @@ typedef pthread_key_t __libc_key_t; __libc_maybe_call (__pthread_mutex_lock, (&(NAME).mutex), 0) #endif -/* Try to lock the named lock variable. */ -#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread) -# define __libc_lock_trylock(NAME) \ - lll_trylock (NAME) -#else -# define __libc_lock_trylock(NAME) \ - __libc_maybe_call (__pthread_mutex_trylock, (&(NAME)), 0) -#endif -#define __libc_rwlock_tryrdlock(NAME) \ - __libc_maybe_call (__pthread_rwlock_tryrdlock, (&(NAME)), 0) -#define __libc_rwlock_trywrlock(NAME) \ - __libc_maybe_call (__pthread_rwlock_trywrlock, (&(NAME)), 0) - /* Try to lock the recursive named lock variable. */ #if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread) # define __libc_lock_trylock_recursive(NAME) \ @@ -303,20 +132,6 @@ typedef pthread_key_t __libc_key_t; __libc_maybe_call (__pthread_mutex_trylock, (&(NAME)), 0) #endif -#define __rtld_lock_trylock_recursive(NAME) \ - __libc_maybe_call (__pthread_mutex_trylock, (&(NAME).mutex), 0) - -/* Unlock the named lock variable. */ -#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread) -# define __libc_lock_unlock(NAME) \ - lll_unlock (NAME, LLL_PRIVATE) -#else -# define __libc_lock_unlock(NAME) \ - __libc_maybe_call (__pthread_mutex_unlock, (&(NAME)), 0) -#endif -#define __libc_rwlock_unlock(NAME) \ - __libc_ptf_call (__pthread_rwlock_unlock, (&(NAME)), 0) - /* Unlock the recursive named lock variable. */ #if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread) /* We do no error checking here. */ @@ -333,58 +148,10 @@ typedef pthread_key_t __libc_key_t; __libc_maybe_call (__pthread_mutex_unlock, (&(NAME)), 0) #endif -#if defined _LIBC && defined SHARED -# define __rtld_lock_default_lock_recursive(lock) \ - ++((pthread_mutex_t *)(lock))->__data.__count; - -# define __rtld_lock_default_unlock_recursive(lock) \ - --((pthread_mutex_t *)(lock))->__data.__count; - -# define __rtld_lock_lock_recursive(NAME) \ - GL(dl_rtld_lock_recursive) (&(NAME).mutex) - -# define __rtld_lock_unlock_recursive(NAME) \ - GL(dl_rtld_unlock_recursive) (&(NAME).mutex) -#else -# define __rtld_lock_lock_recursive(NAME) \ - __libc_maybe_call (__pthread_mutex_lock, (&(NAME).mutex), 0) - -# define __rtld_lock_unlock_recursive(NAME) \ - __libc_maybe_call (__pthread_mutex_unlock, (&(NAME).mutex), 0) -#endif - -/* Define once control variable. */ -#if PTHREAD_ONCE_INIT == 0 -/* Special case for static variables where we can avoid the initialization - if it is zero. */ -# define __libc_once_define(CLASS, NAME) \ - CLASS pthread_once_t NAME -#else -# define __libc_once_define(CLASS, NAME) \ - CLASS pthread_once_t NAME = PTHREAD_ONCE_INIT -#endif - -/* Call handler iff the first call. */ -#define __libc_once(ONCE_CONTROL, INIT_FUNCTION) \ - do { \ - if (PTFAVAIL (__pthread_once)) \ - __libc_ptf_call_always (__pthread_once, (&(ONCE_CONTROL), \ - INIT_FUNCTION)); \ - else if ((ONCE_CONTROL) == PTHREAD_ONCE_INIT) { \ - INIT_FUNCTION (); \ - (ONCE_CONTROL) |= 2; \ - } \ - } while (0) - - /* Note that for I/O cleanup handling we are using the old-style - cancel handling. It does not have to be integrated with C++ snce + 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 (struct _pthread_cleanup_buffer *buffer, - void (*routine) (void *), void *arg); -extern void _pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer, - int execute); 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, @@ -415,170 +182,11 @@ extern void _pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer _buffer.__routine (_buffer.__arg); \ } -/* Sometimes we have to exit the block in the middle. */ -#define __libc_cleanup_end(DOIT) \ - if (_avail) { \ - __libc_ptf_call_always (_pthread_cleanup_pop_restore, (&_buffer, DOIT));\ - } else if (DOIT) \ - _buffer.__routine (_buffer.__arg) - - -/* Normal cleanup handling, based on C cleanup attribute. */ -__extern_inline void -__libc_cleanup_routine (struct __pthread_cleanup_frame *f) -{ - if (f->__do_it) - f->__cancel_routine (f->__cancel_arg); -} - -#define __libc_cleanup_push(fct, arg) \ - do { \ - struct __pthread_cleanup_frame __clframe \ - __attribute__ ((__cleanup__ (__libc_cleanup_routine))) \ - = { .__cancel_routine = (fct), .__cancel_arg = (arg), \ - .__do_it = 1 }; - -#define __libc_cleanup_pop(execute) \ - __clframe.__do_it = (execute); \ - } while (0) - - -/* Create thread-specific key. */ -#define __libc_key_create(KEY, DESTRUCTOR) \ - __libc_ptf_call (__pthread_key_create, (KEY, DESTRUCTOR), 1) -/* Get thread-specific data. */ -#define __libc_getspecific(KEY) \ - __libc_ptf_call (__pthread_getspecific, (KEY), NULL) - -/* Set thread-specific data. */ -#define __libc_setspecific(KEY, VALUE) \ - __libc_ptf_call (__pthread_setspecific, (KEY, VALUE), 0) - - -/* Register handlers to execute before and after `fork'. Note that the - last parameter is NULL. The handlers registered by the libc are - never removed so this is OK. */ -#define __libc_atfork(PREPARE, PARENT, CHILD) \ - __register_atfork (PREPARE, PARENT, CHILD, NULL) -extern int __register_atfork (void (*__prepare) (void), - void (*__parent) (void), - void (*__child) (void), - void *__dso_handle); - -/* Functions that are used by this file and are internal to the GNU C - library. */ - -extern int __pthread_mutex_init (pthread_mutex_t *__mutex, - const pthread_mutexattr_t *__mutex_attr); - -extern int __pthread_mutex_destroy (pthread_mutex_t *__mutex); - -extern int __pthread_mutex_trylock (pthread_mutex_t *__mutex); - -extern int __pthread_mutex_lock (pthread_mutex_t *__mutex); - -extern int __pthread_mutex_unlock (pthread_mutex_t *__mutex); - -extern int __pthread_mutexattr_init (pthread_mutexattr_t *__attr); - -extern int __pthread_mutexattr_destroy (pthread_mutexattr_t *__attr); - -extern int __pthread_mutexattr_settype (pthread_mutexattr_t *__attr, - int __kind); - -#ifdef __USE_UNIX98 -extern int __pthread_rwlock_init (pthread_rwlock_t *__rwlock, - const pthread_rwlockattr_t *__attr); - -extern int __pthread_rwlock_destroy (pthread_rwlock_t *__rwlock); - -extern int __pthread_rwlock_rdlock (pthread_rwlock_t *__rwlock); - -extern int __pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock); - -extern int __pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock); - -extern int __pthread_rwlock_trywrlock (pthread_rwlock_t *__rwlock); - -extern int __pthread_rwlock_unlock (pthread_rwlock_t *__rwlock); -#endif - -extern int __pthread_key_create (pthread_key_t *__key, - void (*__destr_function) (void *)); - -extern int __pthread_setspecific (pthread_key_t __key, - const void *__pointer); - -extern void *__pthread_getspecific (pthread_key_t __key); - -extern int __pthread_once (pthread_once_t *__once_control, - void (*__init_routine) (void)); - -extern int __pthread_atfork (void (*__prepare) (void), - void (*__parent) (void), - void (*__child) (void)); - - - -/* Make the pthread functions weak so that we can elide them from - single-threaded processes. */ -#ifndef __NO_WEAK_PTHREAD_ALIASES -# ifdef weak_extern -# if _LIBC -# include <bp-sym.h> -# else -# define BP_SYM(sym) sym -# endif -weak_extern (BP_SYM (__pthread_mutex_init)) -weak_extern (BP_SYM (__pthread_mutex_destroy)) -weak_extern (BP_SYM (__pthread_mutex_lock)) -weak_extern (BP_SYM (__pthread_mutex_trylock)) -weak_extern (BP_SYM (__pthread_mutex_unlock)) -weak_extern (BP_SYM (__pthread_mutexattr_init)) -weak_extern (BP_SYM (__pthread_mutexattr_destroy)) -weak_extern (BP_SYM (__pthread_mutexattr_settype)) -weak_extern (BP_SYM (__pthread_rwlock_init)) -weak_extern (BP_SYM (__pthread_rwlock_destroy)) -weak_extern (BP_SYM (__pthread_rwlock_rdlock)) -weak_extern (BP_SYM (__pthread_rwlock_tryrdlock)) -weak_extern (BP_SYM (__pthread_rwlock_wrlock)) -weak_extern (BP_SYM (__pthread_rwlock_trywrlock)) -weak_extern (BP_SYM (__pthread_rwlock_unlock)) -weak_extern (BP_SYM (__pthread_key_create)) -weak_extern (BP_SYM (__pthread_setspecific)) -weak_extern (BP_SYM (__pthread_getspecific)) -weak_extern (BP_SYM (__pthread_once)) -weak_extern (__pthread_initialize) -weak_extern (__pthread_atfork) -weak_extern (BP_SYM (_pthread_cleanup_push_defer)) -weak_extern (BP_SYM (_pthread_cleanup_pop_restore)) -weak_extern (BP_SYM (pthread_setcancelstate)) -# else -# pragma weak __pthread_mutex_init -# pragma weak __pthread_mutex_destroy -# pragma weak __pthread_mutex_lock -# pragma weak __pthread_mutex_trylock -# pragma weak __pthread_mutex_unlock -# pragma weak __pthread_mutexattr_init -# pragma weak __pthread_mutexattr_destroy -# pragma weak __pthread_mutexattr_settype -# pragma weak __pthread_rwlock_destroy -# pragma weak __pthread_rwlock_rdlock -# pragma weak __pthread_rwlock_tryrdlock -# pragma weak __pthread_rwlock_wrlock -# pragma weak __pthread_rwlock_trywrlock -# pragma weak __pthread_rwlock_unlock -# pragma weak __pthread_key_create -# pragma weak __pthread_setspecific -# pragma weak __pthread_getspecific -# pragma weak __pthread_once -# pragma weak __pthread_initialize -# pragma weak __pthread_atfork -# pragma weak _pthread_cleanup_push_defer -# pragma weak _pthread_cleanup_pop_restore -# pragma weak pthread_setcancelstate -# endif +/* 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 /* bits/libc-lock.h */ diff --git a/nptl/sysdeps/pthread/bits/libc-lockP.h b/nptl/sysdeps/pthread/bits/libc-lockP.h new file mode 100644 index 0000000000..d08fb9db3c --- /dev/null +++ b/nptl/sysdeps/pthread/bits/libc-lockP.h @@ -0,0 +1,434 @@ +/* Private libc-internal interface for mutex locks. NPTL version. + Copyright (C) 1996-2003, 2005, 2007, 2012 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 <http://www.gnu.org/licenses/>. */ + +#ifndef _BITS_LIBC_LOCKP_H +#define _BITS_LIBC_LOCKP_H 1 + +#include <pthread.h> +#define __need_NULL +#include <stddef.h> + + +/* Fortunately Linux now has a mean to do locking which is realtime + safe without the aid of the thread library. We also need no fancy + options like error checking mutexes etc. We only need simple + locks, maybe recursive. This can be easily and cheaply implemented + using futexes. We will use them everywhere except in ld.so since + ld.so might be used on old kernels with a different libc.so. */ +#include <lowlevellock.h> +#include <tls.h> +#include <pthread-functions.h> + +/* Mutex type. */ +#if defined NOT_IN_libc && !defined IS_IN_libpthread +typedef pthread_mutex_t __libc_lock_t; +#else +typedef int __libc_lock_t; +#endif +typedef struct { pthread_mutex_t mutex; } __rtld_lock_recursive_t; +typedef pthread_rwlock_t __libc_rwlock_t; + +/* Type for key to thread-specific data. */ +typedef pthread_key_t __libc_key_t; + +/* 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(CLASS,NAME) \ + CLASS __libc_lock_t NAME; +#define __libc_rwlock_define(CLASS,NAME) \ + CLASS __libc_rwlock_t NAME; +#define __rtld_lock_define_recursive(CLASS,NAME) \ + CLASS __rtld_lock_recursive_t NAME; + +/* Define an initialized lock variable NAME with storage class CLASS. + + For the C library we take a deeper look at the initializer. For + this implementation all fields are initialized to zero. Therefore + we don't initialize the variable which allows putting it into the + BSS section. (Except on PA-RISC and other odd architectures, where + initialized locks must be set to one due to the lack of normal + atomic operations.) */ + +#if !defined NOT_IN_libc || defined IS_IN_libpthread +# if LLL_LOCK_INITIALIZER == 0 +# define __libc_lock_define_initialized(CLASS,NAME) \ + CLASS __libc_lock_t NAME; +# else +# define __libc_lock_define_initialized(CLASS,NAME) \ + CLASS __libc_lock_t NAME = LLL_LOCK_INITIALIZER; +# endif +#else +# if __LT_SPINLOCK_INIT == 0 +# define __libc_lock_define_initialized(CLASS,NAME) \ + CLASS __libc_lock_t NAME; +# else +# define __libc_lock_define_initialized(CLASS,NAME) \ + CLASS __libc_lock_t NAME = PTHREAD_MUTEX_INITIALIZER; +# endif +#endif + +#define __libc_rwlock_define_initialized(CLASS,NAME) \ + CLASS __libc_rwlock_t NAME = PTHREAD_RWLOCK_INITIALIZER; + +#define __rtld_lock_define_initialized_recursive(CLASS,NAME) \ + CLASS __rtld_lock_recursive_t NAME = _RTLD_LOCK_RECURSIVE_INITIALIZER; +#define _RTLD_LOCK_RECURSIVE_INITIALIZER \ + {PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP} + +#define __rtld_lock_initialize(NAME) \ + (void) ((NAME) = (__rtld_lock_recursive_t) _RTLD_LOCK_RECURSIVE_INITIALIZER) + +/* If we check for a weakly referenced symbol and then perform a + normal jump to it te code generated for some platforms in case of + PIC is unnecessarily slow. What would happen is that the function + is first referenced as data and then it is called indirectly + through the PLT. We can make this a direct jump. */ +#ifdef __PIC__ +# define __libc_maybe_call(FUNC, ARGS, ELSE) \ + (__extension__ ({ __typeof (FUNC) *_fn = (FUNC); \ + _fn != NULL ? (*_fn) ARGS : ELSE; })) +#else +# define __libc_maybe_call(FUNC, ARGS, ELSE) \ + (FUNC != NULL ? FUNC ARGS : ELSE) +#endif + +/* Call thread functions through the function pointer table. */ +#if defined SHARED && !defined NOT_IN_libc +# define PTFAVAIL(NAME) __libc_pthread_functions_init +# define __libc_ptf_call(FUNC, ARGS, ELSE) \ + (__libc_pthread_functions_init ? PTHFCT_CALL (ptr_##FUNC, ARGS) : ELSE) +# define __libc_ptf_call_always(FUNC, ARGS) \ + PTHFCT_CALL (ptr_##FUNC, ARGS) +#else +# define PTFAVAIL(NAME) (NAME != NULL) +# define __libc_ptf_call(FUNC, ARGS, ELSE) \ + __libc_maybe_call (FUNC, ARGS, ELSE) +# define __libc_ptf_call_always(FUNC, ARGS) \ + FUNC ARGS +#endif + + +/* Initialize the named lock variable, leaving it in a consistent, unlocked + state. */ +#if !defined NOT_IN_libc || defined IS_IN_libpthread +# define __libc_lock_init(NAME) ((NAME) = LLL_LOCK_INITIALIZER, 0) +#else +# define __libc_lock_init(NAME) \ + __libc_maybe_call (__pthread_mutex_init, (&(NAME), NULL), 0) +#endif +#if defined SHARED && !defined NOT_IN_libc +/* ((NAME) = (__libc_rwlock_t) PTHREAD_RWLOCK_INITIALIZER, 0) is + inefficient. */ +# define __libc_rwlock_init(NAME) \ + (__builtin_memset (&(NAME), '\0', sizeof (NAME)), 0) +#else +# define __libc_rwlock_init(NAME) \ + __libc_maybe_call (__pthread_rwlock_init, (&(NAME), NULL), 0) +#endif + +#define __rtld_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) + +/* Finalize the named lock variable, which must be locked. It cannot be + used again until __libc_lock_init is called again on it. This must be + called on a lock variable before the containing storage is reused. */ +#if !defined NOT_IN_libc || defined IS_IN_libpthread +# define __libc_lock_fini(NAME) ((void) 0) +#else +# define __libc_lock_fini(NAME) \ + __libc_maybe_call (__pthread_mutex_destroy, (&(NAME)), 0) +#endif +#if defined SHARED && !defined NOT_IN_libc +# define __libc_rwlock_fini(NAME) ((void) 0) +#else +# define __libc_rwlock_fini(NAME) \ + __libc_maybe_call (__pthread_rwlock_destroy, (&(NAME)), 0) +#endif + +/* Lock the named lock variable. */ +#if !defined NOT_IN_libc || defined IS_IN_libpthread +# define __libc_lock_lock(NAME) \ + ({ lll_lock (NAME, LLL_PRIVATE); 0; }) +#else +# define __libc_lock_lock(NAME) \ + __libc_maybe_call (__pthread_mutex_lock, (&(NAME)), 0) +#endif +#define __libc_rwlock_rdlock(NAME) \ + __libc_ptf_call (__pthread_rwlock_rdlock, (&(NAME)), 0) +#define __libc_rwlock_wrlock(NAME) \ + __libc_ptf_call (__pthread_rwlock_wrlock, (&(NAME)), 0) + +/* Try to lock the named lock variable. */ +#if !defined NOT_IN_libc || defined IS_IN_libpthread +# define __libc_lock_trylock(NAME) \ + lll_trylock (NAME) +#else +# define __libc_lock_trylock(NAME) \ + __libc_maybe_call (__pthread_mutex_trylock, (&(NAME)), 0) +#endif +#define __libc_rwlock_tryrdlock(NAME) \ + __libc_maybe_call (__pthread_rwlock_tryrdlock, (&(NAME)), 0) +#define __libc_rwlock_trywrlock(NAME) \ + __libc_maybe_call (__pthread_rwlock_trywrlock, (&(NAME)), 0) + +#define __rtld_lock_trylock_recursive(NAME) \ + __libc_maybe_call (__pthread_mutex_trylock, (&(NAME).mutex), 0) + +/* Unlock the named lock variable. */ +#if !defined NOT_IN_libc || defined IS_IN_libpthread +# define __libc_lock_unlock(NAME) \ + lll_unlock (NAME, LLL_PRIVATE) +#else +# define __libc_lock_unlock(NAME) \ + __libc_maybe_call (__pthread_mutex_unlock, (&(NAME)), 0) +#endif +#define __libc_rwlock_unlock(NAME) \ + __libc_ptf_call (__pthread_rwlock_unlock, (&(NAME)), 0) + +#ifdef SHARED +# define __rtld_lock_default_lock_recursive(lock) \ + ++((pthread_mutex_t *)(lock))->__data.__count; + +# define __rtld_lock_default_unlock_recursive(lock) \ + --((pthread_mutex_t *)(lock))->__data.__count; + +# define __rtld_lock_lock_recursive(NAME) \ + GL(dl_rtld_lock_recursive) (&(NAME).mutex) + +# define __rtld_lock_unlock_recursive(NAME) \ + GL(dl_rtld_unlock_recursive) (&(NAME).mutex) +#else +# define __rtld_lock_lock_recursive(NAME) \ + __libc_maybe_call (__pthread_mutex_lock, (&(NAME).mutex), 0) + +# define __rtld_lock_unlock_recursive(NAME) \ + __libc_maybe_call (__pthread_mutex_unlock, (&(NAME).mutex), 0) +#endif + +/* Define once control variable. */ +#if PTHREAD_ONCE_INIT == 0 +/* Special case for static variables where we can avoid the initialization + if it is zero. */ +# define __libc_once_define(CLASS, NAME) \ + CLASS pthread_once_t NAME +#else +# define __libc_once_define(CLASS, NAME) \ + CLASS pthread_once_t NAME = PTHREAD_ONCE_INIT +#endif + +/* Call handler iff the first call. */ +#define __libc_once(ONCE_CONTROL, INIT_FUNCTION) \ + do { \ + if (PTFAVAIL (__pthread_once)) \ + __libc_ptf_call_always (__pthread_once, (&(ONCE_CONTROL), \ + INIT_FUNCTION)); \ + else if ((ONCE_CONTROL) == PTHREAD_ONCE_INIT) { \ + INIT_FUNCTION (); \ + (ONCE_CONTROL) |= 2; \ + } \ + } while (0) + + +/* Note that for I/O cleanup handling we are using the old-style + cancel handling. It does not have to be integrated with C++ snce + 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 (struct _pthread_cleanup_buffer *buffer, + void (*routine) (void *), void *arg); +extern void _pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer, + int execute); +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); + +/* Sometimes we have to exit the block in the middle. */ +#define __libc_cleanup_end(DOIT) \ + if (_avail) { \ + __libc_ptf_call_always (_pthread_cleanup_pop_restore, (&_buffer, DOIT));\ + } else if (DOIT) \ + _buffer.__routine (_buffer.__arg) + + +/* Normal cleanup handling, based on C cleanup attribute. */ +__extern_inline void +__libc_cleanup_routine (struct __pthread_cleanup_frame *f) +{ + if (f->__do_it) + f->__cancel_routine (f->__cancel_arg); +} + +#define __libc_cleanup_push(fct, arg) \ + do { \ + struct __pthread_cleanup_frame __clframe \ + __attribute__ ((__cleanup__ (__libc_cleanup_routine))) \ + = { .__cancel_routine = (fct), .__cancel_arg = (arg), \ + .__do_it = 1 }; + +#define __libc_cleanup_pop(execute) \ + __clframe.__do_it = (execute); \ + } while (0) + + +/* Create thread-specific key. */ +#define __libc_key_create(KEY, DESTRUCTOR) \ + __libc_ptf_call (__pthread_key_create, (KEY, DESTRUCTOR), 1) + +/* Get thread-specific data. */ +#define __libc_getspecific(KEY) \ + __libc_ptf_call (__pthread_getspecific, (KEY), NULL) + +/* Set thread-specific data. */ +#define __libc_setspecific(KEY, VALUE) \ + __libc_ptf_call (__pthread_setspecific, (KEY, VALUE), 0) + + +/* Register handlers to execute before and after `fork'. Note that the + last parameter is NULL. The handlers registered by the libc are + never removed so this is OK. */ +#define __libc_atfork(PREPARE, PARENT, CHILD) \ + __register_atfork (PREPARE, PARENT, CHILD, NULL) +extern int __register_atfork (void (*__prepare) (void), + void (*__parent) (void), + void (*__child) (void), + void *__dso_handle); + +/* Functions that are used by this file and are internal to the GNU C + library. */ + +extern int __pthread_mutex_init (pthread_mutex_t *__mutex, + const pthread_mutexattr_t *__mutex_attr); + +extern int __pthread_mutex_destroy (pthread_mutex_t *__mutex); + +extern int __pthread_mutex_trylock (pthread_mutex_t *__mutex); + +extern int __pthread_mutex_lock (pthread_mutex_t *__mutex); + +extern int __pthread_mutex_unlock (pthread_mutex_t *__mutex); + +extern int __pthread_mutexattr_init (pthread_mutexattr_t *__attr); + +extern int __pthread_mutexattr_destroy (pthread_mutexattr_t *__attr); + +extern int __pthread_mutexattr_settype (pthread_mutexattr_t *__attr, + int __kind); + +extern int __pthread_rwlock_init (pthread_rwlock_t *__rwlock, + const pthread_rwlockattr_t *__attr); + +extern int __pthread_rwlock_destroy (pthread_rwlock_t *__rwlock); + +extern int __pthread_rwlock_rdlock (pthread_rwlock_t *__rwlock); + +extern int __pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock); + +extern int __pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock); + +extern int __pthread_rwlock_trywrlock (pthread_rwlock_t *__rwlock); + +extern int __pthread_rwlock_unlock (pthread_rwlock_t *__rwlock); + +extern int __pthread_key_create (pthread_key_t *__key, + void (*__destr_function) (void *)); + +extern int __pthread_setspecific (pthread_key_t __key, + const void *__pointer); + +extern void *__pthread_getspecific (pthread_key_t __key); + +extern int __pthread_once (pthread_once_t *__once_control, + void (*__init_routine) (void)); + +extern int __pthread_atfork (void (*__prepare) (void), + void (*__parent) (void), + void (*__child) (void)); + + + +/* Make the pthread functions weak so that we can elide them from + single-threaded processes. */ +#ifndef __NO_WEAK_PTHREAD_ALIASES +# ifdef weak_extern +# include <bp-sym.h> +weak_extern (BP_SYM (__pthread_mutex_init)) +weak_extern (BP_SYM (__pthread_mutex_destroy)) +weak_extern (BP_SYM (__pthread_mutex_lock)) +weak_extern (BP_SYM (__pthread_mutex_trylock)) +weak_extern (BP_SYM (__pthread_mutex_unlock)) +weak_extern (BP_SYM (__pthread_mutexattr_init)) +weak_extern (BP_SYM (__pthread_mutexattr_destroy)) +weak_extern (BP_SYM (__pthread_mutexattr_settype)) +weak_extern (BP_SYM (__pthread_rwlock_init)) +weak_extern (BP_SYM (__pthread_rwlock_destroy)) +weak_extern (BP_SYM (__pthread_rwlock_rdlock)) +weak_extern (BP_SYM (__pthread_rwlock_tryrdlock)) +weak_extern (BP_SYM (__pthread_rwlock_wrlock)) +weak_extern (BP_SYM (__pthread_rwlock_trywrlock)) +weak_extern (BP_SYM (__pthread_rwlock_unlock)) +weak_extern (BP_SYM (__pthread_key_create)) +weak_extern (BP_SYM (__pthread_setspecific)) +weak_extern (BP_SYM (__pthread_getspecific)) +weak_extern (BP_SYM (__pthread_once)) +weak_extern (__pthread_initialize) +weak_extern (__pthread_atfork) +weak_extern (BP_SYM (_pthread_cleanup_push_defer)) +weak_extern (BP_SYM (_pthread_cleanup_pop_restore)) +weak_extern (BP_SYM (pthread_setcancelstate)) +# else +# pragma weak __pthread_mutex_init +# pragma weak __pthread_mutex_destroy +# pragma weak __pthread_mutex_lock +# pragma weak __pthread_mutex_trylock +# pragma weak __pthread_mutex_unlock +# pragma weak __pthread_mutexattr_init +# pragma weak __pthread_mutexattr_destroy +# pragma weak __pthread_mutexattr_settype +# pragma weak __pthread_rwlock_destroy +# pragma weak __pthread_rwlock_rdlock +# pragma weak __pthread_rwlock_tryrdlock +# pragma weak __pthread_rwlock_wrlock +# pragma weak __pthread_rwlock_trywrlock +# pragma weak __pthread_rwlock_unlock +# pragma weak __pthread_key_create +# pragma weak __pthread_setspecific +# pragma weak __pthread_getspecific +# pragma weak __pthread_once +# pragma weak __pthread_initialize +# pragma weak __pthread_atfork +# pragma weak _pthread_cleanup_push_defer +# pragma weak _pthread_cleanup_pop_restore +# pragma weak pthread_setcancelstate +# endif +#endif + +#endif /* bits/libc-lockP.h */ |