1 files changed, 69 insertions, 0 deletions
diff --git a/libjava/sysdep/alpha/locks.h b/libjava/sysdep/alpha/locks.h
new file mode 100644
index 000000000..a6b439408
--- /dev/null
+++ b/libjava/sysdep/alpha/locks.h
@@ -0,0 +1,69 @@
+// locks.h - Thread synchronization primitives. Alpha implementation.
+
+/* Copyright (C) 2002  Free Software Foundation
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+#ifndef __SYSDEP_LOCKS_H__
+#define __SYSDEP_LOCKS_H__
+
+typedef size_t obj_addr_t;	/* Integer type big enough for object	*/
+				/* address.				*/
+
+inline static bool
+compare_and_swap(volatile obj_addr_t *addr,
+		  			      obj_addr_t old,
+					      obj_addr_t new_val) 
+{
+  unsigned long oldval;
+  char result;
+  __asm__ __volatile__(
+      "1:ldq_l %0, %1\n\t" \
+      "cmpeq %0, %5, %2\n\t" \
+      "beq %2, 2f\n\t" \
+      "mov %3, %0\n\t" \
+      "stq_c %0, %1\n\t" \
+      "bne %0, 2f\n\t" \
+      "br 1b\n\t" \
+      "2:mb"
+	      : "=&r"(oldval), "=m"(*addr), "=&r"(result)
+	      : "r" (new_val), "m"(*addr), "r"(old) : "memory");
+  return (bool) result;
+}
+
+inline static void
+release_set(volatile obj_addr_t *addr, obj_addr_t new_val)
+{
+  __asm__ __volatile__("mb" : : : "memory");
+  *(addr) = new_val;
+}
+
+inline static bool
+compare_and_swap_release(volatile obj_addr_t *addr,
+		  				     obj_addr_t old,
+						     obj_addr_t new_val)
+{
+  return compare_and_swap(addr, old, new_val);
+}
+
+// Ensure that subsequent instructions do not execute on stale
+// data that was loaded from memory before the barrier.
+inline static void
+read_barrier()
+{
+  __asm__ __volatile__("mb" : : : "memory");
+}
+
+// Ensure that prior stores to memory are completed with respect to other
+// processors.
+inline static void
+write_barrier()
+{
+  __asm__ __volatile__("wmb" : : : "memory");
+}
+
+#endif