1 files changed, 102 insertions, 0 deletions
diff --git a/libpthread/linuxthreads/spinlock.h b/libpthread/linuxthreads/spinlock.h
new file mode 100644
index 000000000..aae18a27b
--- /dev/null
+++ b/libpthread/linuxthreads/spinlock.h
@@ -0,0 +1,102 @@
+/* Linuxthreads - a simple clone()-based implementation of Posix        */
+/* threads for Linux.                                                   */
+/* Copyright (C) 1998 Xavier Leroy (Xavier.Leroy@inria.fr)              */
+/*                                                                      */
+/* This program 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.               */
+/*                                                                      */
+/* This program 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.                 */
+
+#if defined(TEST_FOR_COMPARE_AND_SWAP)
+
+extern int __pthread_has_cas;
+extern int __pthread_compare_and_swap(long * ptr, long oldval, long newval,
+                                      int * spinlock);
+
+static inline int compare_and_swap(long * ptr, long oldval, long newval,
+                                   int * spinlock)
+{
+  if (__builtin_expect (__pthread_has_cas, 1))
+    return __compare_and_swap(ptr, oldval, newval);
+  else
+    return __pthread_compare_and_swap(ptr, oldval, newval, spinlock);
+}
+
+#elif defined(HAS_COMPARE_AND_SWAP)
+
+static inline int compare_and_swap(long * ptr, long oldval, long newval,
+                                   int * spinlock)
+{
+  return __compare_and_swap(ptr, oldval, newval);
+}
+
+#else
+
+extern int __pthread_compare_and_swap(long * ptr, long oldval, long newval,
+                                      int * spinlock);
+
+static inline int compare_and_swap(long * ptr, long oldval, long newval,
+                                   int * spinlock)
+{
+  return __pthread_compare_and_swap(ptr, oldval, newval, spinlock);
+}
+
+#endif
+
+/* Internal locks */
+
+extern void internal_function __pthread_lock(struct _pthread_fastlock * lock,
+					     pthread_descr self);
+extern void internal_function __pthread_unlock(struct _pthread_fastlock *lock);
+
+static inline void __pthread_init_lock(struct _pthread_fastlock * lock)
+{
+  lock->__status = 0;
+  lock->__spinlock = 0;
+}
+
+static inline int __pthread_trylock (struct _pthread_fastlock * lock)
+{
+  long oldstatus;
+
+  do {
+    oldstatus = lock->__status;
+    if (oldstatus != 0) return EBUSY;
+  } while(! compare_and_swap(&lock->__status, 0, 1, &lock->__spinlock));
+  return 0;
+}
+
+#define LOCK_INITIALIZER {0, 0}
+
+/* Operations on pthread_atomic, which is defined in internals.h */
+
+static inline long atomic_increment(struct pthread_atomic *pa)
+{
+    long oldval;
+
+    do {
+	oldval = pa->p_count;
+    } while (!compare_and_swap(&pa->p_count, oldval, oldval + 1, &pa->p_spinlock));
+
+    return oldval;
+}
+
+
+static inline long atomic_decrement(struct pthread_atomic *pa)
+{
+    long oldval;
+
+    do {
+	oldval = pa->p_count;
+    } while (!compare_and_swap(&pa->p_count, oldval, oldval - 1, &pa->p_spinlock));
+
+    return oldval;
+}
+
+#define ATOMIC_INITIALIZER { 0, 0 }
+