summary refs log tree commit diff
path: root/sysdeps/mach/hurd/bits/libc-lock.h
diff options
context:
space:
mode:
Diffstat (limited to 'sysdeps/mach/hurd/bits/libc-lock.h')
-rw-r--r--sysdeps/mach/hurd/bits/libc-lock.h183
1 files changed, 183 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/bits/libc-lock.h b/sysdeps/mach/hurd/bits/libc-lock.h
new file mode 100644
index 0000000000..6e3835371c
--- /dev/null
+++ b/sysdeps/mach/hurd/bits/libc-lock.h
@@ -0,0 +1,183 @@
+/* libc-internal interface for mutex locks.  Hurd version using Mach cthreads.
+   Copyright (C) 1996,97,98,2000,01 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _BITS_LIBC_LOCK_H
+#define _BITS_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;
+
+#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_define_initialized(CLASS,NAME) \
+  CLASS __libc_lock_t NAME = MUTEX_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)
+
+
+/* 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 __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);				      \
+       }								      \
+  })
+
+
+/* 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);						    \
+
+
+#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)
+
+#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_ */
+
+#endif	/* bits/libc-lock.h */