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Diffstat (limited to 'sysdeps/mach/hurd/libc-lock.h')
| -rw-r--r-- | sysdeps/mach/hurd/libc-lock.h | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/libc-lock.h b/sysdeps/mach/hurd/libc-lock.h new file mode 100644 index 0000000000..f6cbe50fc2 --- /dev/null +++ b/sysdeps/mach/hurd/libc-lock.h @@ -0,0 +1,213 @@ +/* libc-internal interface for mutex locks. Hurd version using Mach cthreads. + Copyright (C) 1996-2016 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 _LIBC_LOCK_H +#define _LIBC_LOCK_H 1 + +#if (_LIBC - 0) || (_CTHREADS_ - 0) +#include <cthreads.h> +#include <hurd/threadvar.h> + +typedef struct mutex __libc_lock_t; +typedef struct +{ + struct mutex mutex; + void *owner; + int count; +} __libc_lock_recursive_t; +typedef __libc_lock_recursive_t __rtld_lock_recursive_t; + +#define __libc_lock_owner_self() ((void *) __hurd_threadvar_location (0)) + +#else +typedef struct __libc_lock_opaque__ __libc_lock_t; +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(CLASS,NAME) \ + CLASS __libc_lock_t NAME; + +/* Define an initialized lock variable NAME with storage class CLASS. */ +#define _LIBC_LOCK_INITIALIZER MUTEX_INITIALIZER +#define __libc_lock_define_initialized(CLASS,NAME) \ + CLASS __libc_lock_t NAME = _LIBC_LOCK_INITIALIZER; + +/* Initialize the named lock variable, leaving it in a consistent, unlocked + state. */ +#define __libc_lock_init(NAME) __mutex_init (&(NAME)) + +/* 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. */ +#define __libc_lock_fini(NAME) __mutex_unlock (&(NAME)) +#define __libc_lock_fini_recursive(NAME) __mutex_unlock (&(NAME).mutex) +#define __rtld_lock_fini_recursive(NAME) __mutex_unlock (&(NAME).mutex) + + +/* Lock the named lock variable. */ +#define __libc_lock_lock(NAME) __mutex_lock (&(NAME)) + +/* Lock the named lock variable. */ +#define __libc_lock_trylock(NAME) (!__mutex_trylock (&(NAME))) + +/* Unlock the named lock variable. */ +#define __libc_lock_unlock(NAME) __mutex_unlock (&(NAME)) + + +#define __libc_lock_define_recursive(CLASS,NAME) \ + CLASS __libc_lock_recursive_t NAME; +#define _LIBC_LOCK_RECURSIVE_INITIALIZER { MUTEX_INITIALIZER, 0, 0 } +#define __libc_lock_define_initialized_recursive(CLASS,NAME) \ + CLASS __libc_lock_recursive_t NAME = _LIBC_LOCK_RECURSIVE_INITIALIZER; + +#define __rtld_lock_define_recursive(CLASS,NAME) \ + __libc_lock_define_recursive (CLASS, NAME) +#define _RTLD_LOCK_RECURSIVE_INITIALIZER \ + _LIBC_LOCK_RECURSIVE_INITIALIZER +#define __rtld_lock_define_initialized_recursive(CLASS,NAME) \ + __libc_lock_define_initialized_recursive (CLASS, NAME) + +#define __libc_lock_init_recursive(NAME) \ + ({ __libc_lock_recursive_t *const __lock = &(NAME); \ + __lock->owner = 0; mutex_init (&__lock->mutex); }) + +#define __libc_lock_trylock_recursive(NAME) \ + ({ __libc_lock_recursive_t *const __lock = &(NAME); \ + void *__self = __libc_lock_owner_self (); \ + __mutex_trylock (&__lock->mutex) \ + ? (__lock->owner = __self, __lock->count = 1, 0) \ + : __lock->owner == __self ? (++__lock->count, 0) : 1; }) + +#define __libc_lock_lock_recursive(NAME) \ + ({ __libc_lock_recursive_t *const __lock = &(NAME); \ + void *__self = __libc_lock_owner_self (); \ + if (__mutex_trylock (&__lock->mutex) \ + || (__lock->owner != __self \ + && (__mutex_lock (&__lock->mutex), 1))) \ + __lock->owner = __self, __lock->count = 1; \ + else \ + ++__lock->count; \ + }) +#define __libc_lock_unlock_recursive(NAME) \ + ({ __libc_lock_recursive_t *const __lock = &(NAME); \ + if (--__lock->count == 0) \ + { \ + __lock->owner = 0; \ + __mutex_unlock (&__lock->mutex); \ + } \ + }) + + +#define __rtld_lock_initialize(NAME) \ + (void) ((NAME) = (__rtld_lock_recursive_t) _RTLD_LOCK_RECURSIVE_INITIALIZER) +#define __rtld_lock_trylock_recursive(NAME) \ + __libc_lock_trylock_recursive (NAME) +#define __rtld_lock_lock_recursive(NAME) \ + __libc_lock_lock_recursive(NAME) +#define __rtld_lock_unlock_recursive(NAME) \ + __libc_lock_unlock_recursive (NAME) + + +/* XXX for now */ +#define __libc_rwlock_define __libc_lock_define +#define __libc_rwlock_define_initialized __libc_lock_define_initialized +#define __libc_rwlock_init __libc_lock_init +#define __libc_rwlock_fini __libc_lock_fini +#define __libc_rwlock_rdlock __libc_lock_lock +#define __libc_rwlock_wrlock __libc_lock_lock +#define __libc_rwlock_tryrdlock __libc_lock_trylock +#define __libc_rwlock_trywrlock __libc_lock_trylock +#define __libc_rwlock_unlock __libc_lock_unlock + + +/* Start a critical region with a cleanup function */ +#define __libc_cleanup_region_start(DOIT, FCT, ARG) \ +{ \ + typeof (***(FCT)) *__save_FCT = (DOIT) ? (FCT) : 0; \ + typeof (ARG) __save_ARG = ARG; \ + /* close brace is in __libc_cleanup_region_end below. */ + +/* End a critical region started with __libc_cleanup_region_start. */ +#define __libc_cleanup_region_end(DOIT) \ + if ((DOIT) && __save_FCT != 0) \ + (*__save_FCT)(__save_ARG); \ +} + +/* Sometimes we have to exit the block in the middle. */ +#define __libc_cleanup_end(DOIT) \ + if ((DOIT) && __save_FCT != 0) \ + (*__save_FCT)(__save_ARG); \ + +#define __libc_cleanup_push(fct, arg) __libc_cleanup_region_start (1, fct, arg) +#define __libc_cleanup_pop(execute) __libc_cleanup_region_end (execute) + +#if (_CTHREADS_ - 0) + +/* Use mutexes as once control variables. */ + +struct __libc_once + { + __libc_lock_t lock; + int done; + }; + +#define __libc_once_define(CLASS,NAME) \ + CLASS struct __libc_once NAME = { MUTEX_INITIALIZER, 0 } + +/* Call handler iff the first call. */ +#define __libc_once(ONCE_CONTROL, INIT_FUNCTION) \ + do { \ + __libc_lock_lock (ONCE_CONTROL.lock); \ + if (!ONCE_CONTROL.done) \ + (INIT_FUNCTION) (); \ + ONCE_CONTROL.done = 1; \ + __libc_lock_unlock (ONCE_CONTROL.lock); \ + } while (0) + +/* Get once control variable. */ +#define __libc_once_get(ONCE_CONTROL) ((ONCE_CONTROL).done != 0) + +#ifdef _LIBC +/* We need portable names for some functions. E.g., when they are + used as argument to __libc_cleanup_region_start. */ +#define __libc_mutex_unlock __mutex_unlock +#endif + +/* Type for key of thread specific data. */ +typedef cthread_key_t __libc_key_t; + +#define __libc_key_create(KEY,DEST) cthread_keycreate (KEY) +#define __libc_setspecific(KEY,VAL) cthread_setspecific (KEY, VAL) +void *__libc_getspecific (__libc_key_t key); + +#endif /* _CTHREADS_ */ + +/* 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 */ |