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Diffstat (limited to 'libpthread/linuxthreads/sysdeps/arc/pt-machine.h')
-rw-r--r--libpthread/linuxthreads/sysdeps/arc/pt-machine.h42
1 files changed, 42 insertions, 0 deletions
diff --git a/libpthread/linuxthreads/sysdeps/arc/pt-machine.h b/libpthread/linuxthreads/sysdeps/arc/pt-machine.h
new file mode 100644
index 000000000..8df1e77e3
--- /dev/null
+++ b/libpthread/linuxthreads/sysdeps/arc/pt-machine.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#ifndef _PT_MACHINE_H
+#define _PT_MACHINE_H 1
+#include <features.h>
+
+#ifndef PT_EI
+# define PT_EI __extern_always_inline
+#endif
+
+extern long int testandset (int *spinlock);
+extern int __compare_and_swap (long int *p, long int oldval, long int newval);
+
+PT_EI long int
+testandset (int *spinlock)
+{
+ unsigned int old = 1;
+
+ /* Atomically exchange @spinlock with 1 */
+ __asm__ __volatile__(
+ "ex %0, [%1]"
+ : "+r" (old)
+ : "r" (spinlock)
+ : "memory");
+
+ return old;
+
+}
+
+/* Get some notion of the current stack. Need not be exactly the top
+ of the stack, just something somewhere in the current frame.
+ I don't trust register variables, so let's do this the safe way. */
+#define CURRENT_STACK_FRAME \
+__extension__ ({ char *__sp; __asm__ ("mov %0,sp" : "=r" (__sp)); __sp; })
+
+#else
+#error PT_MACHINE already defined
+#endif /* pt-machine.h */