2004-02-10 Randolph Chung <tausq@debian.org>

        * configure.in: Build java for hppa target.
        * configure: Regenerate.
        * libjava/configure.host (hppa-*): Add target.
        * libjava/sysdeps/pa/lock.h: New file.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@79703 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 78 insertions, 0 deletions

diff --git a/libjava/sysdep/pa/locks.h b/libjava/sysdep/pa/locks.h
new file mode 100644
index 00000000000..3f24afc5669
--- /dev/null
+++ b/libjava/sysdep/pa/locks.h
@@ -0,0 +1,78 @@
+// locks.h - Thread synchronization primitives. PARISC 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.				*/
+
+// Atomically replace *addr by new_val if it was initially equal to old.
+// Return true if the comparison succeeded.
+// Assumed to have acquire semantics, i.e. later memory operations
+// cannot execute before the compare_and_swap finishes.
+inline static bool
+compare_and_swap(volatile obj_addr_t *addr,
+	 	 obj_addr_t old,
+		 obj_addr_t new_val) 
+{
+  /* FIXME: not atomic */
+  obj_addr_t prev;
+
+  if ((prev = *addr) == old)
+    {
+      *addr = new_val;
+      return true;
+    }
+  else
+    {
+      return false;
+    }
+}
+
+// Set *addr to new_val with release semantics, i.e. making sure
+// that prior loads and stores complete before this
+// assignment.
+inline static void
+release_set(volatile obj_addr_t *addr, obj_addr_t new_val)
+{
+  __asm__ __volatile__(" " : : : "memory");
+  *(addr) = new_val;
+}
+
+// Compare_and_swap with release semantics instead of acquire semantics.
+// On many architecture, the operation makes both guarantees, so the
+// implementation can be the same.
+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__(" " : : : "memory");
+}
+
+// Ensure that prior stores to memory are completed with respect to other
+// processors.
+inline static void
+write_barrier()
+{
+  __asm__ __volatile__(" " : : : "memory");
+}
+
+#endif
+