private/workqueue_private.h

   1 /*
   2  * Copyright (c) 2007, 2012 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #ifndef __PTHREAD_WORKQUEUE_H__
  25 #define __PTHREAD_WORKQUEUE_H__
  26
  27 #include <sys/cdefs.h>
  28 #include <sys/event.h>
  29 #include <Availability.h>
  30 #include <pthread/pthread.h>
  31 #include <pthread/qos.h>
  32 #ifndef _PTHREAD_BUILDING_PTHREAD_
  33 #include <pthread/qos_private.h>
  34 #endif
  35
  36 #define PTHREAD_WORKQUEUE_SPI_VERSION 20150304
  37
  38 /* Feature checking flags, returned by _pthread_workqueue_supported()
  39  *
  40  * Note: These bits should match the definition of PTHREAD_FEATURE_*
  41  * bits defined in libpthread/kern/kern_internal.h */
  42
  43 #define WORKQ_FEATURE_DISPATCHFUNC      0x01    // pthread_workqueue_setdispatch_np is supported (or not)
  44 #define WORKQ_FEATURE_FINEPRIO          0x02    // fine grained pthread workq priorities
  45 #define WORKQ_FEATURE_MAINTENANCE       0x10    // QOS class maintenance
  46 #define WORKQ_FEATURE_KEVENT        0x20    // Support for direct kevent delivery
  47
  48 /* Legacy dispatch priority bands */
  49
  50 #define WORKQ_NUM_PRIOQUEUE     4
  51
  52 #define WORKQ_HIGH_PRIOQUEUE    0       // high priority queue
  53 #define WORKQ_DEFAULT_PRIOQUEUE 1       // default priority queue
  54 #define WORKQ_LOW_PRIOQUEUE     2       // low priority queue
  55 #define WORKQ_BG_PRIOQUEUE      3       // background priority queue
  56 #define WORKQ_NON_INTERACTIVE_PRIOQUEUE 128 // libdispatch SPI level
  57
  58 /* Legacy dispatch workqueue function flags */
  59 #define WORKQ_ADDTHREADS_OPTION_OVERCOMMIT 0x00000001
  60
  61 __BEGIN_DECLS
  62
  63 // Legacy callback prototype, used with pthread_workqueue_setdispatch_np
  64 typedef void (*pthread_workqueue_function_t)(int queue_priority, int options, void *ctxt);
  65 // New callback prototype, used with pthread_workqueue_init
  66 typedef void (*pthread_workqueue_function2_t)(pthread_priority_t priority);
  67 // Newer callback prototype, used in conjection with function2 when there are kevents to deliver
  68 // both parameters are in/out parameters
  69 typedef void (*pthread_workqueue_function_kevent_t)(void **events, int *nevents);
  70
  71 // Initialises the pthread workqueue subsystem, passing the new-style callback prototype,
  72 // the dispatchoffset and an unused flags field.
  73 __OSX_AVAILABLE_STARTING(__MAC_10_10, __IPHONE_8_0)
  74 int
  75 _pthread_workqueue_init(pthread_workqueue_function2_t func, int offset, int flags);
  76
  77 __OSX_AVAILABLE_STARTING(__MAC_10_11, __IPHONE_9_0)
  78 int
  79 _pthread_workqueue_init_with_kevent(pthread_workqueue_function2_t queue_func, pthread_workqueue_function_kevent_t kevent_func, int offset, int flags);
  80
  81 // Non-zero enables kill on current thread, zero disables it.
  82 __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_3_2)
  83 int
  84 __pthread_workqueue_setkill(int);
  85
  86 // Dispatch function to be called when new worker threads are created.
  87 __OSX_AVAILABLE_STARTING(__MAC_10_8, __IPHONE_6_0)
  88 int
  89 pthread_workqueue_setdispatch_np(pthread_workqueue_function_t worker_func);
  90
  91 // Dispatch offset to be set in the kernel.
  92 __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_7_0)
  93 void
  94 pthread_workqueue_setdispatchoffset_np(int offset);
  95
  96 // Request additional worker threads.
  97 __OSX_AVAILABLE_STARTING(__MAC_10_8, __IPHONE_6_0)
  98 int
  99 pthread_workqueue_addthreads_np(int queue_priority, int options, int numthreads);
 100
 101 // Retrieve the supported pthread feature set
 102 __OSX_AVAILABLE_STARTING(__MAC_10_10, __IPHONE_8_0)
 103 int
 104 _pthread_workqueue_supported(void);
 105
 106 // Request worker threads (fine grained priority)
 107 __OSX_AVAILABLE_STARTING(__MAC_10_10, __IPHONE_8_0)
 108 int
 109 _pthread_workqueue_addthreads(int numthreads, pthread_priority_t priority);
 110
 111 __OSX_AVAILABLE_STARTING(__MAC_10_11, __IPHONE_9_0)
 112 int
 113 _pthread_workqueue_set_event_manager_priority(pthread_priority_t priority);
 114
 115 // Apply a QoS override without allocating userspace memory
 116 __OSX_AVAILABLE_STARTING(__MAC_10_10, __IPHONE_8_0)
 117 int
 118 _pthread_override_qos_class_start_direct(mach_port_t thread, pthread_priority_t priority);
 119
 120 // Drop a corresponding QoS override made above.
 121 __OSX_AVAILABLE_STARTING(__MAC_10_10, __IPHONE_8_0)
 122 int
 123 _pthread_override_qos_class_end_direct(mach_port_t thread);
 124
 125 // Apply a QoS override on a given workqueue thread.
 126 __OSX_AVAILABLE_STARTING(__MAC_10_10, __IPHONE_8_0)
 127 int
 128 _pthread_workqueue_override_start_direct(mach_port_t thread, pthread_priority_t priority);
 129
 130 // Drop all QoS overrides on the current workqueue thread.
 131 __OSX_AVAILABLE_STARTING(__MAC_10_10, __IPHONE_8_0)
 132 int
 133 _pthread_workqueue_override_reset(void);
 134
 135 // Apply a QoS override on a given thread (can be non-workqueue as well) with a resource/queue token
 136 __OSX_AVAILABLE_STARTING(__MAC_10_10_2, __IPHONE_NA)
 137 int
 138 _pthread_workqueue_asynchronous_override_add(mach_port_t thread, pthread_priority_t priority, void *resource);
 139
 140 // Reset overrides for the given resource for the current thread
 141 __OSX_AVAILABLE_STARTING(__MAC_10_10_2, __IPHONE_NA)
 142 int
 143 _pthread_workqueue_asynchronous_override_reset_self(void *resource);
 144
 145 // Reset overrides for all resources for the current thread
 146 __OSX_AVAILABLE_STARTING(__MAC_10_10_2, __IPHONE_NA)
 147 int
 148 _pthread_workqueue_asynchronous_override_reset_all_self(void);
 149
 150 __END_DECLS
 151
 152 #endif // __PTHREAD_WORKQUEUE_H__