407 lines
14 KiB
C
407 lines
14 KiB
C
/*
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* Copyright (c) 2000-2017 Apple Computer, Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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#ifndef _PTHREAD_PRIORITY_PRIVATE_H_
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#define _PTHREAD_PRIORITY_PRIVATE_H_
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#if KERNEL
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#define PTHREAD_EXPOSE_LAYOUT 1
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#else
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#include <TargetConditionals.h>
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#if TARGET_OS_SIMULATOR
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#define PTHREAD_EXPOSE_LAYOUT 0
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#else
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#define PTHREAD_EXPOSE_LAYOUT 1
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#endif /* TARGET_OS_SIMULATOR */
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#endif
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/*!
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* @typedef pthread_priority_t
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*
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* @abstract
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* pthread_priority_t is an on opaque integer that is guaranteed to be ordered
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* such that combations of QoS classes and relative priorities are ordered
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* numerically, according to their combined priority.
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*
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* <b>xnu, pthread & libdispatch flags</b>
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*
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* @const _PTHREAD_PRIORITY_OVERCOMMIT_FLAG
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* The thread this priority is applied to is overcommit (affects the workqueue
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* creation policy for this priority).
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*
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* @const _PTHREAD_PRIORITY_COOPERATIVE_FLAG
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* Used to convey that a thread is part of the cooperative pool. This is used
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* both outgoing form kernel and incoming into kernel
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*
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* @const _PTHREAD_PRIORITY_THREAD_TYPE_MASK
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* The set of bits that encode information about the thread type - whether it is
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* overcommit, non-overcommit or cooperative
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*
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* @const _PTHREAD_PRIORITY_FALLBACK_FLAG
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* Indicates that this priority is is used only when incoming events have no
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* priority at all. It is merely used as a fallback (hence the name) instead of
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* a floor.
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*
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* This is usually used with QOS_CLASS_DEFAULT and a 0 relative priority.
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*
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* @const _PTHREAD_PRIORITY_EVENT_MANAGER_FLAG
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* The event manager flag indicates that this thread/request is for a event
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* manager thread. There can only ever be one event manager thread at a time
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* and it is brought up at the highest of all event manager priorities pthread
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* knows about.
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*
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* @const _PTHREAD_PRIORITY_OVERRIDE_QOS_FLAG
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* This flag indicates that the bits extracted using
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* _PTHREAD_PRIORITY_QOS_CLASS_MASK represent { QoS override, req QoS } instead
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* of just req QoS. This is only currently only used as input to the kernel as
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* part of pthread_set_properties_self(). The override field here represents the
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* dispatch workqueue override.
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*
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* @const _PTHREAD_PRIORITY_SCHED_PRI_FLAG
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* @const _PTHREAD_PRIORITY_SCHED_PRI_MASK
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* This flag indicates that the bits extracted using
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* _PTHREAD_PRIORITY_SCHED_PRI_MASK represent a scheduler priority instead of
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* a {qos, relative priority} pair.
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*
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* This flag is used by the pthread kext to indicate to libdispatch that the
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* event manager queue priority is a scheduling priority and not a QoS. When
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* the manager thread's priority is updated due to creation of pthread root
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* queues, libdispatch passed a pthread_priority_t in to kernel with this flag
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* to specify the new sched pri of manager. This flag is never used as an input
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* by anything else and is why it can perform a double duty with
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* _PTHREAD_PRIORITY_ROOTQUEUE_FLAG.
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*
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* @const _PTHREAD_PRIORITY_NEEDS_UNBIND_FLAG
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* This flag is used for the priority of event delivery threads to indicate
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* to libdispatch that this thread is bound to a kqueue.
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*
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* <b>dispatch only flags</b>
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*
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* @const _PTHREAD_PRIORITY_INHERIT_FLAG
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* This flag is meaningful to libdispatch only and has no meaning for the
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* kernel and/or pthread.
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*
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* @const _PTHREAD_PRIORITY_ROOTQUEUE_FLAG
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* This flag is meaningful to libdispatch only and has no meaning for the
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* kernel and/or pthread.
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*
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* @const _PTHREAD_PRIORITY_ENFORCE_FLAG
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* This flag is used to indicate that this priority should be prefered for work
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* submited asynchronously over the intrinsic priority of the queue/thread the
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* work is submitted to.
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*
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*
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* pthread_priority_t encoding - outgoing from kernel:
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*
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* Regular:
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* flags req QoS class Rel pri
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* |---------------------------------|--------------------|--------------------|
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* 22 - 31 8-21 0-7
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*
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* With _PTHREAD_PRIORITY_SCHED_PRI_FLAG:
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*
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* flags unused sched priority
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* |---------------------------------|----------|------------------------------|
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* 22 - 31 16-21 0-15
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*
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* pthread_priority_t encoding - incoming to kernel via various syscalls:
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*
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* Regular:
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*
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* flags req QoS class Rel pri
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* |---------------------------------|--------------------|--------------------|
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* 22 - 31 8-21 0-7
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*
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* With _PTHREAD_PRIORITY_OVERRIDE_QOS_FLAG:
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*
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* flags QoS ovr QoS class Rel pri
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* |---------------------------------|---------|----------|--------------------|
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* 22 - 31 14-21 8-13 0-7
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*
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* With _PTHREAD_PRIORITY_SCHED_PRI_FLAG:
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*
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* flags unused sched priority
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* |---------------------------------|----------|------------------------------|
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* 22 - 31 16-21 0-15
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*/
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typedef unsigned long pthread_priority_t;
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#define _PTHREAD_PRIORITY_OVERCOMMIT_FLAG 0x80000000u
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#define _PTHREAD_PRIORITY_INHERIT_FLAG 0x40000000u /* dispatch only */
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#define _PTHREAD_PRIORITY_ROOTQUEUE_FLAG 0x20000000u /* dispatch only */
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#define _PTHREAD_PRIORITY_SCHED_PRI_FLAG 0x20000000u
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#define _PTHREAD_PRIORITY_ENFORCE_FLAG 0x10000000u /* dispatch only */
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#define _PTHREAD_PRIORITY_FALLBACK_FLAG 0x04000000u
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#define _PTHREAD_PRIORITY_COOPERATIVE_FLAG 0x08000000u
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#define _PTHREAD_PRIORITY_EVENT_MANAGER_FLAG 0x02000000u
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#define _PTHREAD_PRIORITY_NEEDS_UNBIND_FLAG 0x01000000u
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#define _PTHREAD_PRIORITY_DEFAULTQUEUE_FLAG _PTHREAD_PRIORITY_FALLBACK_FLAG // compat
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#define _PTHREAD_PRIORITY_OVERRIDE_QOS_FLAG 0x00800000u
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#define _PTHREAD_PRIORITY_THREAD_TYPE_MASK (_PTHREAD_PRIORITY_COOPERATIVE_FLAG | _PTHREAD_PRIORITY_OVERCOMMIT_FLAG)
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#if PTHREAD_EXPOSE_LAYOUT || defined(__PTHREAD_EXPOSE_INTERNALS__)
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// Masks for encoding of pthread priority
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#define _PTHREAD_PRIORITY_FLAGS_MASK 0xff000000u
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#define _PTHREAD_PRIORITY_SCHED_PRI_MASK 0x0000ffffu
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#define _PTHREAD_PRIORITY_QOS_CLASS_MASK 0x003fff00u
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#define _PTHREAD_PRIORITY_QOS_CLASS_SHIFT (8ull)
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#define _PTHREAD_PRIORITY_VALID_QOS_CLASS_MASK 0x00003f00u
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#define _PTHREAD_PRIORITY_VALID_OVERRIDE_QOS_MASK 0x003fc000u
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#define _PTHREAD_PRIORITY_QOS_OVERRIDE_SHIFT (14ull)
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#define _PTHREAD_PRIORITY_PRIORITY_MASK 0x000000ffu
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#define _PTHREAD_PRIORITY_PRIORITY_SHIFT (0)
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#endif /* PTHREAD_EXPOSE_LAYOUT */
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#if PRIVATE
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#if XNU_KERNEL_PRIVATE && !defined(__PTHREAD_EXPOSE_INTERNALS__)
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#define __PTHREAD_EXPOSE_INTERNALS__ 1
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#endif // XNU_KERNEL_PRIVATE
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#ifdef __PTHREAD_EXPOSE_INTERNALS__
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/*
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* This exposes the encoding used for pthread_priority_t
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* and is meant to be used by pthread and XNU only
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*/
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#include <mach/thread_policy.h> // THREAD_QOS_*
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#include <stdbool.h>
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// pthread_priority_t's type is unfortunately 64bits on LP64
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// so we use this type for people who need to store it in structs
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typedef unsigned int pthread_priority_compact_t;
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__attribute__((always_inline, const))
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static inline bool
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_pthread_priority_has_qos(pthread_priority_t pp)
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{
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return (pp & (_PTHREAD_PRIORITY_SCHED_PRI_FLAG |
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_PTHREAD_PRIORITY_EVENT_MANAGER_FLAG)) == 0 &&
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(pp & _PTHREAD_PRIORITY_VALID_QOS_CLASS_MASK) != 0;
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}
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__attribute__((always_inline, const))
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static inline bool
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_pthread_priority_has_sched_pri(pthread_priority_t pp)
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{
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return pp & _PTHREAD_PRIORITY_SCHED_PRI_FLAG;
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}
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__attribute__((always_inline, const))
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static inline bool
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_pthread_priority_has_override_qos(pthread_priority_t pp)
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{
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return (pp & (_PTHREAD_PRIORITY_SCHED_PRI_FLAG |
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_PTHREAD_PRIORITY_EVENT_MANAGER_FLAG)) == 0 &&
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(pp & _PTHREAD_PRIORITY_OVERRIDE_QOS_FLAG) != 0 &&
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(pp & _PTHREAD_PRIORITY_VALID_OVERRIDE_QOS_MASK) != 0;
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}
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__attribute__((always_inline, const))
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static inline pthread_priority_compact_t
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_pthread_priority_make_from_thread_qos(thread_qos_t qos, int relpri,
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unsigned long flags)
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{
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pthread_priority_compact_t pp = (flags & _PTHREAD_PRIORITY_FLAGS_MASK);
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if (qos && qos < THREAD_QOS_LAST) {
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pp |= (1 << (_PTHREAD_PRIORITY_QOS_CLASS_SHIFT + qos - 1));
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pp |= ((uint8_t)relpri - 1) & _PTHREAD_PRIORITY_PRIORITY_MASK;
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}
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return pp;
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}
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__attribute__((always_inline, const))
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static inline pthread_priority_compact_t
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_pthread_priority_make_from_sched_pri(int sched_pri, unsigned long flags)
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{
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pthread_priority_compact_t pp = (flags & _PTHREAD_PRIORITY_FLAGS_MASK);
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pp |= _PTHREAD_PRIORITY_SCHED_PRI_FLAG;
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pp |= (pthread_priority_compact_t) sched_pri;
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return pp;
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}
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__attribute__((always_inline, const))
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static inline pthread_priority_compact_t
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_pthread_priority_make_from_thread_qos_and_override(thread_qos_t req_qos,
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int relpri, thread_qos_t override_qos, unsigned long flags)
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{
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pthread_priority_compact_t pp;
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pp = _pthread_priority_make_from_thread_qos(req_qos, relpri, flags);
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if (override_qos && override_qos < THREAD_QOS_LAST) {
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pp |= (1 << (_PTHREAD_PRIORITY_QOS_OVERRIDE_SHIFT + (override_qos - 1)));
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pp |= _PTHREAD_PRIORITY_OVERRIDE_QOS_FLAG;
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}
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return pp;
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}
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__attribute__((always_inline, const))
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static inline pthread_priority_compact_t
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_pthread_event_manager_priority(void)
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{
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return _PTHREAD_PRIORITY_EVENT_MANAGER_FLAG;
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}
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__attribute__((always_inline, const))
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static inline pthread_priority_compact_t
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_pthread_unspecified_priority(void)
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{
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return _pthread_priority_make_from_thread_qos(THREAD_QOS_UNSPECIFIED, 0, 0);
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}
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__attribute__((always_inline, const))
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static inline pthread_priority_compact_t
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_pthread_default_priority(unsigned long flags)
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{
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return _pthread_priority_make_from_thread_qos(THREAD_QOS_LEGACY, 0, flags);
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}
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__attribute__((always_inline, const))
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static inline thread_qos_t
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_pthread_priority_thread_qos_fast(pthread_priority_t pp)
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{
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pp &= _PTHREAD_PRIORITY_VALID_QOS_CLASS_MASK;
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pp >>= _PTHREAD_PRIORITY_QOS_CLASS_SHIFT;
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return (thread_qos_t)__builtin_ffs((int)pp);
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}
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__attribute__((always_inline, const))
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static inline thread_qos_t
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_pthread_priority_thread_override_qos_fast(pthread_priority_t pp)
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{
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pp &= _PTHREAD_PRIORITY_VALID_OVERRIDE_QOS_MASK;
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pp >>= _PTHREAD_PRIORITY_QOS_OVERRIDE_SHIFT;
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return (thread_qos_t)__builtin_ffs((int)pp);
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}
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__attribute__((always_inline, const))
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static inline int
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_pthread_priority_sched_pri_fast(pthread_priority_t pp)
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{
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return pp & _PTHREAD_PRIORITY_SCHED_PRI_MASK;
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}
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__attribute__((always_inline, const))
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static inline thread_qos_t
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_pthread_priority_thread_qos(pthread_priority_t pp)
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{
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if (_pthread_priority_has_qos(pp)) {
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return _pthread_priority_thread_qos_fast(pp);
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}
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return THREAD_QOS_UNSPECIFIED;
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}
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__attribute__((always_inline, const))
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static inline thread_qos_t
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_pthread_priority_thread_override_qos(pthread_priority_t pp)
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{
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if (_pthread_priority_has_override_qos(pp)) {
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return _pthread_priority_thread_override_qos_fast(pp);
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}
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return THREAD_QOS_UNSPECIFIED;
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}
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__attribute__((always_inline, const))
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static inline int
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_pthread_priority_sched_pri(pthread_priority_t pp)
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{
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if (_pthread_priority_has_sched_pri(pp)) {
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return _pthread_priority_sched_pri_fast(pp);
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}
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return 0;
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}
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__attribute__((always_inline, const))
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static inline int
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_pthread_priority_relpri(pthread_priority_t pp)
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{
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if (_pthread_priority_has_qos(pp)) {
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pp &= _PTHREAD_PRIORITY_PRIORITY_MASK;
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pp >>= _PTHREAD_PRIORITY_PRIORITY_SHIFT;
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return (int8_t)pp + 1;
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}
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return 0;
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}
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__attribute__((always_inline, const))
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static inline bool
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_pthread_priority_is_overcommit(pthread_priority_t pp)
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{
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return pp & _PTHREAD_PRIORITY_OVERCOMMIT_FLAG;
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}
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__attribute__((always_inline, const))
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static inline bool
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_pthread_priority_is_cooperative(pthread_priority_t pp)
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{
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return pp & _PTHREAD_PRIORITY_COOPERATIVE_FLAG;
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}
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__attribute__((always_inline, const))
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static inline bool
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_pthread_priority_is_nonovercommit(pthread_priority_t pp)
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{
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return !_pthread_priority_is_cooperative(pp) && !_pthread_priority_is_overcommit(pp);
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}
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#if XNU_KERNEL_PRIVATE
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// Interfaces only used by the kernel and not implemented in userspace.
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/*
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* Keep managerness, overcomitness and fallback, discard other flags.
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* Normalize and validate QoS/relpri
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*/
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__attribute__((const))
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pthread_priority_compact_t
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_pthread_priority_normalize(pthread_priority_t pp);
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/*
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* Keep managerness, discard other flags.
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* Normalize and validate QoS/relpri
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*/
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__attribute__((const))
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pthread_priority_compact_t
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_pthread_priority_normalize_for_ipc(pthread_priority_t pp);
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/*
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* Keep the flags from base_pp and return the priority with the maximum priority
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* of base_pp and _pthread_priority_make_from_thread_qos(qos, 0, 0)
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*/
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__attribute__((const))
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pthread_priority_compact_t
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_pthread_priority_combine(pthread_priority_t base_pp, thread_qos_t qos);
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#endif // XNU_KERNEL_PRIVATE
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#endif // __PTHREAD_EXPOSE_INTERNALS__
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#endif // PRIVATE
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#endif // _PTHREAD_PRIORITY_PRIVATE_H_
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