Messages in this thread Patch in this message |  | | | Date | Wed, 14 Jan 2004 14:50:32 -0800 | | From | inaky.perez-gonzalez@intel ... | | Subject | [RFC/PATCH] FUSYN 9/10: stub for priority protection |
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fulock-pp.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 66 insertions(+) --- /dev/null Wed Jan 14 14:39:30 2004 +++ linux/kernel/fulock-pp.c Wed Jan 14 11:13:33 2004 @@ -0,0 +1,66 @@ + +/* + * Fast User real-time/pi/pp/robust/deadlock SYNchronization + * (C) 2002-2003 Intel Corp + * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>. + * + * Licensed under the FSF's GNU Public License v2 or later. + * + * Based on normal futexes (futex.c), (C) Rusty Russell. + * Please refer to Documentation/fusyn.txt for more info. + * + * Stuff for priority-protected fulocks + */ + +#include <linux/fulock.h> +#include <linux/plist.h> +#include <linux/time.h> /* struct timespec */ +#include <linux/sched.h> /* MAX_SCHEDULE_TIMEOUT */ +#include <linux/errno.h> +#include <linux/fulock.h> + +/** + * Check if a process is allowed to lock a PP fulock. + * + * @fulock: fulock to check on. + * @task: Task to check for acquisition. + */ +int __fulock_pp_allowed (struct fulock *fulock) +{ + int policy = fulock->flags & FULOCK_FL_PP_PLC_MK > 20; + int priority = fulock->flags & FULOCK_FL_PP_PRIO_MK > 12; + int prio; + + if (policy != SCHED_NORMAL) + prio = MAX_USER_RT_PRIO - 1 - priority; + else + prio = priority; + fulock->flags &= ~FULOCK_FL_PP_PRIO_MK; + fulock->flags |= prio & FULOCK_FL_PP_PRIO_MK; +#warning FIXME: interaction with PI? Compare against static, not dynamic? + if (prio > current->prio) + return -EINVAL; + return 0; +} + + +/** FIXME */ +void __fulock_pp_boost (struct fulock *fulock) +{ +#warning FIXME: finish me +} + + +/** + * Remove the boosting in priority of the owner of a + * priority-protected @fulock. + * + * @fulock: fulock whose owner's priority is to be boosted. + * + * If the fulock is a priority-protected lock, boost the priority of + * the owner to the fulock's priority ceiling. + */ +void __fulock_pp_unboost (struct fulock *fulock) +{ +} + - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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