Provide an nusleep equivalent function to nmsleep.

util.c

@@ -844,6 +844,29 @@ void nmsleep(unsigned int msecs)
 #endif
 }
 
+/* Same for usecs */
+void nusleep(unsigned int usecs)
+{
+	struct timespec twait, tleft;
+	int ret;
+	ldiv_t d;
+
+#ifdef WIN32
+	timeBeginPeriod(1);
+#endif
+	d = ldiv(usecs, 1000000);
+	tleft.tv_sec = d.quot;
+	tleft.tv_nsec = d.rem * 1000;
+	do {
+		twait.tv_sec = tleft.tv_sec;
+		twait.tv_nsec = tleft.tv_nsec;
+		ret = nanosleep(&twait, &tleft);
+	} while (ret == -1 && errno == EINTR);
+#ifdef WIN32
+	timeEndPeriod(1);
+#endif
+}
+
 /* This is a cgminer gettimeofday wrapper. Since we always call gettimeofday
  * with tz set to NULL, and windows' default resolution is only 15ms, this
  * gives us higher resolution times on windows. */

util.h

@@ -58,6 +58,7 @@ int thr_info_create(struct thr_info *thr, pthread_attr_t *attr, void *(*start) (
 void thr_info_freeze(struct thr_info *thr);
 void thr_info_cancel(struct thr_info *thr);
 void nmsleep(unsigned int msecs);
+void nusleep(unsigned int usecs);
 void cgtime(struct timeval *tv);
 void subtime(struct timeval *a, struct timeval *b);
 void addtime(struct timeval *a, struct timeval *b);