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-rw-r--r--db2/mutex/x86.gcc17
1 files changed, 17 insertions, 0 deletions
diff --git a/db2/mutex/x86.gcc b/db2/mutex/x86.gcc
new file mode 100644
index 0000000000..886a6811a2
--- /dev/null
+++ b/db2/mutex/x86.gcc
@@ -0,0 +1,17 @@
+/*
+ * @(#)x86.gcc	10.2 (Sleepycat) 6/21/97
+ *
+ * For gcc/x86, 0 is clear, 1 is set.
+ */
+#define	TSL_SET(tsl) ({							\
+	register tsl_t *__l = (tsl);					\
+	int __r;							\
+	asm volatile("movl $1,%%eax; xchgb %1,%%al; xorl $1,%%eax"	\
+	    : "=&a" (__r), "=m" (*__l)					\
+	    : "1" (*__l)						\
+	    );								\
+	__r & 1;							\
+})
+
+#define	TSL_UNSET(tsl)	(*(tsl) = 0)
+#define	TSL_INIT(tsl)	TSL_UNSET(tsl)