thodg/cgminer

diff --git a/miner.h b/miner.h
index c2a0bd5..c368480 100644
--- a/miner.h
+++ b/miner.h
@@ -426,7 +426,7 @@ struct thr_info {
 extern int thr_info_create(struct thr_info *thr, pthread_attr_t *attr, void *(*start) (void *), void *arg);
 extern void thr_info_cancel(struct thr_info *thr);
 extern void thr_info_freeze(struct thr_info *thr);
-
+extern void nmsleep(unsigned int msecs);
 
 struct string_elist {
 	char *string;
diff --git a/util.c b/util.c
index b17ecea..01cbb20 100644
--- a/util.c
+++ b/util.c
@@ -687,3 +687,14 @@ void thr_info_cancel(struct thr_info *thr)
 		PTH(thr) = 0L;
 	}
 }
+
+/* Provide a ms based sleep that uses nanosleep to avoid poor usleep accuracy
+ * on SMP machines */
+void nmsleep(unsigned int msecs)
+{
+	struct timespec twait;
+
+	twait.tv_sec = msecs / 1000;
+	twait.tv_nsec = (uint64_t)(msecs * 1000000) - (uint64_t)(twait.tv_sec / 1000000000);
+	nanosleep(&twait, NULL);
+}