1 files changed, 73 insertions, 0 deletions
diff --git a/sysdeps/generic/bits/rwlock.h b/sysdeps/generic/bits/rwlock.h
new file mode 100644
index 0000000..d089b0c
--- /dev/null
+++ b/sysdeps/generic/bits/rwlock.h
@@ -0,0 +1,73 @@
+/* rwlock type.  Generic version.
+   Copyright (C) 2002 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef _BITS_RWLOCK_H
+#define _BITS_RWLOCK_H
+
+#include <bits/spin-lock.h>
+
+/* User visible part of a rwlock.  If __held is not held and readers
+   is 0, then the lock is unlocked.  If __held is held and readers is
+   0, then the lock is held by a writer.  If __held is held and
+   readers is greater than 0, then the lock is held by READERS
+   readers.  */
+struct __pthread_rwlock
+  {
+    __pthread_spinlock_t __held;
+    __pthread_spinlock_t __lock;
+    int readers;
+    struct __pthread *readerqueue;
+    struct __pthread *writerqueue;
+    struct __pthread_rwlockattr *__attr;
+    void *__data;
+  };
+
+/* Initializer for a rwlock.  */
+#define __PTHREAD_RWLOCK_INITIALIZER \
+    ((struct __pthread_rwlock) \
+      { __SPIN_LOCK_INITIALIZER, __SPIN_LOCK_INITIALIZER, 0, 0, 0, 0, 0 })
+
+
+_EXTERN_INLINE int
+pthread_rwlock_init (struct __pthread_rwlock *__rwlock,
+		     const struct __pthread_rwlockattr *__attr)
+{
+  extern int _pthread_rwlock_init (struct __pthread_rwlock *,
+				   const struct __pthread_rwlockattr *);
+
+  if (__attr)
+    return _pthread_rwlock_init (__rwlock, __attr);
+
+  *__rwlock = __PTHREAD_RWLOCK_INITIALIZER;
+  return 0;
+}
+
+_EXTERN_INLINE int
+pthread_rwlock_destroy (struct __pthread_rwlock *__rwlock)
+{
+  extern int _pthread_rwlock_destroy (struct __pthread_rwlock *);
+
+  if (__rwlock->__attr
+      || __rwlock->__data)
+    return _pthread_rwlock_destroy (__rwlock);
+
+  return 0;
+}
+
+#endif /* bits/rwlock.h */