Initial checkin.

1 files changed, 46 insertions, 0 deletions

diff --git a/libpthread/linuxthreads/sysdeps/v850/pt-machine.h b/libpthread/linuxthreads/sysdeps/v850/pt-machine.h
new file mode 100644
index 000000000..a28360c58
--- /dev/null
+++ b/libpthread/linuxthreads/sysdeps/v850/pt-machine.h
@@ -0,0 +1,46 @@
+/*
+ * sysdeps/v850/pt-machine.h -- v850-specific pthread definitions
+ *
+ *  Copyright (C) 2002  NEC Electronics Corporation
+ *  Copyright (C) 2002  Miles Bader <miles@gnu.org>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License.  See the file COPYING in the main directory of this
+ * archive for more details.
+ *
+ * Written by Miles Bader <miles@gnu.org>
+ */
+
+#ifndef PT_EI
+# define PT_EI extern inline
+#endif
+
+/* Get some notion of the current stack.  Need not be exactly the top
+   of the stack, just something somewhere in the current frame.  */
+#define CURRENT_STACK_FRAME  __stack_pointer
+register char *__stack_pointer __asm__ ("sp");
+
+#define HAS_COMPARE_AND_SWAP
+
+/* Atomically:  If *PTR == OLD, set *PTR to NEW and return true,
+   otherwise do nothing and return false.  */
+PT_EI int
+__compare_and_swap (long *ptr, long old, long new)
+{
+  unsigned long psw;
+
+  /* disable interrupts  */
+  __asm__ __volatile__ ("stsr psw, %0; di" : "=&r" (psw));
+
+  if (likely (*ptr == old))
+    {
+      *ptr = new;
+      __asm__ __volatile__ ("ldsr %0, psw" :: "r" (psw)); /* re-enable */
+      return 1;
+    }
+  else
+    {
+      __asm__ __volatile__ ("ldsr %0, psw" :: "r" (psw)); /* re-enable */
+      return 0;
+    }
+}