* configure.host: Add SH support.

        * sysdep/sh/locks.h: New file.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@55922 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 72 insertions, 0 deletions

diff --git a/libjava/sysdep/sh/locks.h b/libjava/sysdep/sh/locks.h
new file mode 100644
index 00000000000..f6076d60199
--- /dev/null
+++ b/libjava/sysdep/sh/locks.h
@@ -0,0 +1,72 @@
+// locks.h - Thread synchronization primitives. SuperH 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.				*/
+
+static unsigned char __cas_lock = 0;
+
+inline static void
+__cas_start_atomic (void)
+{
+  unsigned int val;
+
+  do
+    __asm__ __volatile__ ("tas.b @%1; movt %0"
+			  : "=r" (val)
+			  : "r" (&__cas_lock)
+			  : "memory");
+  while (val == 0);
+}
+
+inline static void
+__cas_end_atomic (void)
+{
+  __asm__ __volatile__ (" " : : : "memory");
+  __cas_lock = 0;
+}
+
+inline static bool
+compare_and_swap (volatile obj_addr_t *addr, obj_addr_t old,
+		  obj_addr_t new_val)
+{
+  bool ret;
+
+  __cas_start_atomic ();
+  if (*addr != old)
+    ret = false;
+  else
+    {
+      *addr = new_val;
+      ret = true;
+    }
+  __cas_end_atomic ();
+
+  return ret;
+}
+
+inline static void
+release_set (volatile obj_addr_t *addr, obj_addr_t new_val)
+{
+  __asm__ __volatile__ (" " : : : "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);
+}
+
+#endif /* ! __SYSDEP_LOCKS_H__ */