index 534543eed31447d2fcf2b4ab37aeac4ff7d2798e..174fa60d6ec0a1332d3d974ea223f6f051481b0f 100644 (file)
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/include/storage/s_lock.h,v 1.166 2009年01月01日 17:24:01 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/storage/s_lock.h,v 1.167 2009年07月27日 05:31:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#endif /* __m32r__ */
+#if defined(__sh__) /* Renesas' SuperH */
+#define HAS_TEST_AND_SET
+
+typedef unsigned char slock_t;
+
+#define TAS(lock) tas(lock)
+
+static __inline__ int
+tas(volatile slock_t *lock)
+{
+ register int _res;
+
+ /*
+ * This asm is coded as if %0 could be any register, but actually SuperH
+ * restricts the target of xor-immediate to be R0. That's handled by
+ * the "z" constraint on _res.
+ */
+ __asm__ __volatile__(
+ " tas.b @%2 \n"
+ " movt %0 \n"
+ " xor #1,%0 \n"
+: "=z"(_res), "+m"(*lock)
+: "r"(lock)
+: "memory", "t");
+ return _res;
+}
+
+#endif /* __sh__ */
+
+
/* These live in s_lock.c, but only for gcc */