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Diffstat (limited to '')
-rw-r--r-- | src/thread/Util.hxx | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/src/thread/Util.hxx b/src/thread/Util.hxx new file mode 100644 index 000000000..d71230c20 --- /dev/null +++ b/src/thread/Util.hxx @@ -0,0 +1,85 @@ +/* + * 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 +}; + +/** + * Raise the current thread's priority to "real-time" (very high). + */ +static inline void +SetThreadRealtime() +{ +#ifdef __linux__ + struct sched_param sched_param; + sched_param.sched_priority = 50; + sched_setscheduler(0, SCHED_FIFO|SCHED_RESET_ON_FORK, &sched_param); +#endif +}; + +#endif |