1 files changed, 72 insertions, 0 deletions
diff --git a/src/thread/Util.hxx b/src/thread/Util.hxx
new file mode 100644
index 000000000..fe36468c3
--- /dev/null
+++ b/src/thread/Util.hxx
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_THREAD_UTIL_HXX
+#define MPD_THREAD_UTIL_HXX
+
+#ifdef __linux__
+#include <sched.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+#elif defined(WIN32)
+#include <windows.h>
+#endif
+
+#ifdef __linux__
+
+static int
+ioprio_set(int which, int who, int ioprio)
+{
+	return syscall(SYS_ioprio_set, which, who, ioprio);
+}
+
+static void
+ioprio_set_idle()
+{
+	static constexpr int _IOPRIO_WHO_PROCESS = 1;
+	static constexpr int _IOPRIO_CLASS_IDLE = 3;
+	static constexpr int _IOPRIO_CLASS_SHIFT = 13;
+	static constexpr int _IOPRIO_IDLE =
+		(_IOPRIO_CLASS_IDLE << _IOPRIO_CLASS_SHIFT) | 7;
+
+	ioprio_set(_IOPRIO_WHO_PROCESS, 0, _IOPRIO_IDLE);
+}
+
+#endif
+
+/**
+ * Lower the current thread's priority to "idle" (very low).
+ */
+static inline void
+SetThreadIdlePriority()
+{
+#ifdef __linux__
+#ifdef SCHED_IDLE
+	static struct sched_param sched_param;
+	sched_setscheduler(0, SCHED_IDLE, &sched_param);
+#endif
+
+	ioprio_set_idle();
+
+#elif defined(WIN32)
+	SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_IDLE);
+#endif
+};
+
+#endif