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diff --git a/libgomp/config/posix/ptrlock.h b/libgomp/config/posix/ptrlock.h
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+/* Copyright (C) 2008, 2009 Free Software Foundation, Inc.
+ Contributed by Jakub Jelinek <jakub@redhat.com>.
+
+ This file is part of the GNU OpenMP Library (libgomp).
+
+ Libgomp is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3, or (at your option)
+ any later version.
+
+ Libgomp 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 General Public License for
+ more details.
+
+ Under Section 7 of GPL version 3, you are granted additional
+ permissions described in the GCC Runtime Library Exception, version
+ 3.1, as published by the Free Software Foundation.
+
+ You should have received a copy of the GNU General Public License and
+ a copy of the GCC Runtime Library Exception along with this program;
+ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+ <http://www.gnu.org/licenses/>. */
+
+/* This is a Linux specific implementation of a mutex synchronization
+ mechanism for libgomp. This type is private to the library. This
+ implementation uses atomic instructions and the futex syscall. */
+
+#ifndef GOMP_PTRLOCK_H
+#define GOMP_PTRLOCK_H 1
+
+typedef struct { void *ptr; gomp_mutex_t lock; } gomp_ptrlock_t;
+
+static inline void gomp_ptrlock_init (gomp_ptrlock_t *ptrlock, void *ptr)
+{
+ ptrlock->ptr = ptr;
+ gomp_mutex_init (&ptrlock->lock);
+}
+
+static inline void *gomp_ptrlock_get (gomp_ptrlock_t *ptrlock)
+{
+ if (ptrlock->ptr != NULL)
+ return ptrlock->ptr;
+
+ gomp_mutex_lock (&ptrlock->lock);
+ if (ptrlock->ptr != NULL)
+ {
+ gomp_mutex_unlock (&ptrlock->lock);
+ return ptrlock->ptr;
+ }
+
+ return NULL;
+}
+
+static inline void gomp_ptrlock_set (gomp_ptrlock_t *ptrlock, void *ptr)
+{
+ ptrlock->ptr = ptr;
+ gomp_mutex_unlock (&ptrlock->lock);
+}
+
+static inline void gomp_ptrlock_destroy (gomp_ptrlock_t *ptrlock)
+{
+ gomp_mutex_destroy (&ptrlock->lock);
+}
+
+#endif /* GOMP_PTRLOCK_H */