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