Create a generic spin-lock-inline.h using gcc's __sync primitives.

2008-12-11  Neal H. Walfield  <neal@gnu.org>

	* sysdeps/generic/bits/spin-lock-inline.h: New file.

2 files changed, 103 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 8942404..0c7540c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2008-12-11  Neal H. Walfield  <neal@gnu.org>
 
+	* sysdeps/generic/bits/spin-lock-inline.h: New file.
+
+2008-12-11  Neal H. Walfield  <neal@gnu.org>
+
 	* pthread/pt-alloc.c (__pthread_alloc): Use calloc, not malloc, to
 	allocate a new struct __pthread.
 
diff --git a/sysdeps/generic/bits/spin-lock-inline.h b/sysdeps/generic/bits/spin-lock-inline.h
new file mode 100644
index 0000000..6c3e06e
--- /dev/null
+++ b/sysdeps/generic/bits/spin-lock-inline.h
@@ -0,0 +1,99 @@
+/* Machine-specific definitions for spin locks.  Generic version.
+   Copyright (C) 2000, 2005, 2008 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.  */
+
+/*
+ * Never include this file directly; use <pthread.h> or <cthreads.h> instead.
+ */
+
+#ifndef _BITS_SPIN_LOCK_INLINE_H
+#define _BITS_SPIN_LOCK_INLINE_H	1
+
+#include <features.h>
+#include <bits/spin-lock.h>
+
+__BEGIN_DECLS
+
+#if defined __USE_EXTERN_INLINES || defined _FORCE_INLINES
+
+# if !defined (__EBUSY) || !defined (__EINVAL)
+#  include <errno.h>
+#  ifndef __EBUSY
+#   define __EBUSY EBUSY
+#  endif
+#  ifndef __EINVAL
+#   define __EINVAL EINVAL
+#  endif
+# endif
+
+# ifndef __PT_SPIN_INLINE
+#  define __PT_SPIN_INLINE __extern_inline
+# endif
+
+__PT_SPIN_INLINE int __pthread_spin_destroy (__pthread_spinlock_t *__lock);
+
+__PT_SPIN_INLINE int
+__pthread_spin_destroy (__pthread_spinlock_t *__lock)
+{
+  return 0;
+}
+
+__PT_SPIN_INLINE int __pthread_spin_init (__pthread_spinlock_t *__lock,
+					  int __pshared);
+
+__PT_SPIN_INLINE int
+__pthread_spin_init (__pthread_spinlock_t *__lock, int __pshared)
+{
+  *__lock = __SPIN_LOCK_INITIALIZER;
+  return 0;
+}
+
+__PT_SPIN_INLINE int __pthread_spin_trylock (__pthread_spinlock_t *__lock);
+
+__PT_SPIN_INLINE int
+__pthread_spin_trylock (__pthread_spinlock_t *__lock)
+{
+  int __locked = __sync_val_compare_and_swap (__lock, 0, 1);
+  return __locked ? __EBUSY : 0;
+}
+
+__extern_inline int __pthread_spin_lock (__pthread_spinlock_t *__lock);
+extern int _pthread_spin_lock (__pthread_spinlock_t *__lock);
+
+__extern_inline int
+__pthread_spin_lock (__pthread_spinlock_t *__lock)
+{
+  if (__pthread_spin_trylock (__lock))
+    return _pthread_spin_lock (__lock);
+  return 0;
+}
+
+__PT_SPIN_INLINE int __pthread_spin_unlock (__pthread_spinlock_t *__lock);
+
+__PT_SPIN_INLINE int
+__pthread_spin_unlock (__pthread_spinlock_t *__lock)
+{
+  int __locked = __sync_val_compare_and_swap (__lock, 1, 0);
+  return __locked ? 0 : __EINVAL;
+}
+
+#endif /* Use extern inlines or force inlines.  */
+
+__END_DECLS
+
+#endif /* bits/spin-lock.h */