virtual abstraction of Alsa Raw+Seq

1 files changed, 35 insertions, 0 deletions

diff --git a/libs/backends/alsa/select_sleep.h b/libs/backends/alsa/select_sleep.h
new file mode 100644
index 0000000000..ec6a93d4bc
--- /dev/null
+++ b/libs/backends/alsa/select_sleep.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2004,2014 Robin Gareus <robin@gareus.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <stdint.h>
+#include <sys/select.h>
+
+/* select() sleeps _at most_ a given time.
+ * (compared to usleep() or nanosleep() which sleep at least a given time)
+ */
+static void select_sleep (uint64_t usec) {
+	if (usec <= 10) return;
+	fd_set fd;
+	int max_fd=0;
+	struct timeval tv;
+	tv.tv_sec = usec / 1000000;
+	tv.tv_usec = usec % 1000000;
+	FD_ZERO (&fd);
+	select (max_fd, &fd, NULL, NULL, &tv);
+	// on Linux, tv reflects the actual time slept.
+}