| | 1 | /* |
| | 2 | * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved. |
| | 3 | * |
| | 4 | * @APPLE_OSREFERENCE_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. The rights granted to you under the License |
| | 10 | * may not be used to create, or enable the creation or redistribution of, |
| | 11 | * unlawful or unlicensed copies of an Apple operating system, or to |
| | 12 | * circumvent, violate, or enable the circumvention or violation of, any |
| | 13 | * terms of an Apple operating system software license agreement. |
| | 14 | * |
| | 15 | * Please obtain a copy of the License at |
| | 16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. |
| | 17 | * |
| | 18 | * The Original Code and all software distributed under the License are |
| | 19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
| | 20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| | 21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
| | 22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| | 23 | * Please see the License for the specific language governing rights and |
| | 24 | * limitations under the License. |
| | 25 | * |
| | 26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
| | 27 | */ |
| | 28 | /* |
| | 29 | * @OSF_COPYRIGHT@ |
| | 30 | */ |
| | 31 | /* |
| | 32 | * Mach Operating System |
| | 33 | * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University |
| | 34 | * All Rights Reserved. |
| | 35 | * |
| | 36 | * Permission to use, copy, modify and distribute this software and its |
| | 37 | * documentation is hereby granted, provided that both the copyright |
| | 38 | * notice and this permission notice appear in all copies of the |
| | 39 | * software, derivative works or modified versions, and any portions |
| | 40 | * thereof, and that both notices appear in supporting documentation. |
| | 41 | * |
| | 42 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" |
| | 43 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR |
| | 44 | * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. |
| | 45 | * |
| | 46 | * Carnegie Mellon requests users of this software to return to |
| | 47 | * |
| | 48 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU |
| | 49 | * School of Computer Science |
| | 50 | * Carnegie Mellon University |
| | 51 | * Pittsburgh PA 15213-3890 |
| | 52 | * |
| | 53 | * any improvements or extensions that they make and grant Carnegie Mellon |
| | 54 | * the rights to redistribute these changes. |
| | 55 | */ |
| | 56 | /* |
| | 57 | */ |
| | 58 | /* |
| | 59 | * File: sched_prim.h |
| | 60 | * Author: David Golub |
| | 61 | * |
| | 62 | * Scheduling primitive definitions file |
| | 63 | * |
| | 64 | */ |
| | 65 | |
| | 66 | #ifndef _KERN_SCHED_PRIM_H_ |
| | 67 | #define _KERN_SCHED_PRIM_H_ |
| | 68 | |
| | 69 | #include <mach/boolean.h> |
| | 70 | #include <mach/machine/vm_types.h> |
| | 71 | #include <mach/kern_return.h> |
| | 72 | #include <kern/clock.h> |
| | 73 | #include <kern/kern_types.h> |
| | 74 | #include <kern/thread.h> |
| | 75 | #include <sys/cdefs.h> |
| | 76 | |
| | 77 | #ifdef MACH_KERNEL_PRIVATE |
| | 78 | |
| | 79 | /* Initialization */ |
| | 80 | extern void sched_init(void) __attribute__((section("__TEXT, initcode"))); |
| | 81 | |
| | 82 | extern void sched_startup(void); |
| | 83 | |
| | 84 | extern void sched_timebase_init(void); |
| | 85 | |
| | 86 | /* Force a preemption point for a thread and wait for it to stop running */ |
| | 87 | extern boolean_t thread_stop( |
| | 88 | thread_t thread); |
| | 89 | |
| | 90 | /* Release a previous stop request */ |
| | 91 | extern void thread_unstop( |
| | 92 | thread_t thread); |
| | 93 | |
| | 94 | /* Wait for a thread to stop running */ |
| | 95 | extern void thread_wait( |
| | 96 | thread_t thread); |
| | 97 | |
| | 98 | /* Unblock thread on wake up */ |
| | 99 | extern boolean_t thread_unblock( |
| | 100 | thread_t thread, |
| | 101 | wait_result_t wresult); |
| | 102 | |
| | 103 | /* Unblock and dispatch thread */ |
| | 104 | extern kern_return_t thread_go( |
| | 105 | thread_t thread, |
| | 106 | wait_result_t wresult); |
| | 107 | |
| | 108 | /* Handle threads at context switch */ |
| | 109 | extern void thread_dispatch( |
| | 110 | thread_t old_thread, |
| | 111 | thread_t new_thread); |
| | 112 | |
| | 113 | /* Switch directly to a particular thread */ |
| | 114 | extern int thread_run( |
| | 115 | thread_t self, |
| | 116 | thread_continue_t continuation, |
| | 117 | void *parameter, |
| | 118 | thread_t new_thread); |
| | 119 | |
| | 120 | /* Resume thread with new stack */ |
| | 121 | extern void thread_continue( |
| | 122 | thread_t old_thread); |
| | 123 | |
| | 124 | /* Invoke continuation */ |
| | 125 | extern void call_continuation( |
| | 126 | thread_continue_t continuation, |
| | 127 | void *parameter, |
| | 128 | wait_result_t wresult); |
| | 129 | |
| | 130 | /* Set the current scheduled priority */ |
| | 131 | extern void set_sched_pri( |
| | 132 | thread_t thread, |
| | 133 | int priority); |
| | 134 | |
| | 135 | /* Set base priority of the specified thread */ |
| | 136 | extern void set_priority( |
| | 137 | thread_t thread, |
| | 138 | int priority); |
| | 139 | |
| | 140 | /* Reset scheduled priority of thread */ |
| | 141 | extern void compute_priority( |
| | 142 | thread_t thread, |
| | 143 | boolean_t override_depress); |
| | 144 | |
| | 145 | /* Adjust scheduled priority of thread during execution */ |
| | 146 | extern void compute_my_priority( |
| | 147 | thread_t thread); |
| | 148 | |
| | 149 | /* Periodic scheduler activity */ |
| | 150 | extern void sched_tick_thread(void); |
| | 151 | |
| | 152 | /* Perform sched_tick housekeeping activities */ |
| | 153 | extern void update_priority( |
| | 154 | thread_t thread); |
| | 155 | |
| | 156 | /* Idle processor thread */ |
| | 157 | extern void idle_thread(void); |
| | 158 | |
| | 159 | extern kern_return_t idle_thread_create( |
| | 160 | processor_t processor); |
| | 161 | |
| | 162 | /* Start thread running */ |
| | 163 | extern void thread_bootstrap_return(void); |
| | 164 | |
| | 165 | /* Continuation return from syscall */ |
| | 166 | extern void thread_syscall_return( |
| | 167 | kern_return_t ret); |
| | 168 | |
| | 169 | /* Context switch */ |
| | 170 | extern wait_result_t thread_block_reason( |
| | 171 | thread_continue_t continuation, |
| | 172 | void *parameter, |
| | 173 | ast_t reason); |
| | 174 | |
| | 175 | /* Reschedule thread for execution */ |
| | 176 | extern void thread_setrun( |
| | 177 | thread_t thread, |
| | 178 | integer_t options); |
| | 179 | |
| | 180 | #define SCHED_TAILQ 1 |
| | 181 | #define SCHED_HEADQ 2 |
| | 182 | #define SCHED_PREEMPT 4 |
| | 183 | |
| | 184 | /* Bind the current thread to a particular processor */ |
| | 185 | extern processor_t thread_bind( |
| | 186 | processor_t processor); |
| | 187 | |
| | 188 | extern void run_queue_init( |
| | 189 | run_queue_t runq); |
| | 190 | |
| | 191 | extern void thread_timer_expire( |
| | 192 | void *thread, |
| | 193 | void *p1); |
| | 194 | |
| | 195 | /* Set the maximum interrupt level for the thread */ |
| | 196 | __private_extern__ wait_interrupt_t thread_interrupt_level( |
| | 197 | wait_interrupt_t interruptible); |
| | 198 | |
| | 199 | __private_extern__ wait_result_t thread_mark_wait_locked( |
| | 200 | thread_t thread, |
| | 201 | wait_interrupt_t interruptible); |
| | 202 | |
| | 203 | /* Wake up locked thread directly, passing result */ |
| | 204 | __private_extern__ kern_return_t clear_wait_internal( |
| | 205 | thread_t thread, |
| | 206 | wait_result_t result); |
| | 207 | |
| | 208 | #endif /* MACH_KERNEL_PRIVATE */ |
| | 209 | |
| | 210 | __BEGIN_DECLS |
| | 211 | |
| | 212 | #ifdef XNU_KERNEL_PRIVATE |
| | 213 | |
| | 214 | extern boolean_t assert_wait_possible(void); |
| | 215 | |
| | 216 | /* |
| | 217 | ****************** Only exported until BSD stops using ******************** |
| | 218 | */ |
| | 219 | |
| | 220 | /* Wake up thread directly, passing result */ |
| | 221 | extern kern_return_t clear_wait( |
| | 222 | thread_t thread, |
| | 223 | wait_result_t result); |
| | 224 | |
| | 225 | /* Return from exception (BSD-visible interface) */ |
| | 226 | extern void thread_exception_return(void) __dead2; |
| | 227 | |
| | 228 | #endif /* XNU_KERNEL_PRIVATE */ |
| | 229 | |
| | 230 | /* Context switch */ |
| | 231 | extern wait_result_t thread_block( |
| | 232 | thread_continue_t continuation); |
| | 233 | |
| | 234 | extern wait_result_t thread_block_parameter( |
| | 235 | thread_continue_t continuation, |
| | 236 | void *parameter); |
| | 237 | |
| | 238 | /* Declare thread will wait on a particular event */ |
| | 239 | extern wait_result_t assert_wait( |
| | 240 | event_t event, |
| | 241 | wait_interrupt_t interruptible); |
| | 242 | |
| | 243 | /* Assert that the thread intends to wait with a timeout */ |
| | 244 | extern wait_result_t assert_wait_timeout( |
| | 245 | event_t event, |
| | 246 | wait_interrupt_t interruptible, |
| | 247 | uint32_t interval, |
| | 248 | uint32_t scale_factor); |
| | 249 | |
| | 250 | extern wait_result_t assert_wait_deadline( |
| | 251 | event_t event, |
| | 252 | wait_interrupt_t interruptible, |
| | 253 | uint64_t deadline); |
| | 254 | |
| | 255 | /* Wake up thread (or threads) waiting on a particular event */ |
| | 256 | extern kern_return_t thread_wakeup_prim( |
| | 257 | event_t event, |
| | 258 | boolean_t one_thread, |
| | 259 | wait_result_t result); |
| | 260 | |
| | 261 | #define thread_wakeup(x) \ |
| | 262 | thread_wakeup_prim((x), FALSE, THREAD_AWAKENED) |
| | 263 | #define thread_wakeup_with_result(x, z) \ |
| | 264 | thread_wakeup_prim((x), FALSE, (z)) |
| | 265 | #define thread_wakeup_one(x) \ |
| | 266 | thread_wakeup_prim((x), TRUE, THREAD_AWAKENED) |
| | 267 | |
| | 268 | extern boolean_t preemption_enabled(void); |
| | 269 | |
| | 270 | #ifdef KERNEL_PRIVATE |
| | 271 | |
| | 272 | /* |
| | 273 | * Obsolete interfaces. |
| | 274 | */ |
| | 275 | |
| | 276 | extern void thread_set_timer( |
| | 277 | uint32_t interval, |
| | 278 | uint32_t scale_factor); |
| | 279 | |
| | 280 | extern void thread_set_timer_deadline( |
| | 281 | uint64_t deadline); |
| | 282 | |
| | 283 | extern void thread_cancel_timer(void); |
| | 284 | |
| | 285 | #ifndef MACH_KERNEL_PRIVATE |
| | 286 | |
| | 287 | #ifndef ABSOLUTETIME_SCALAR_TYPE |
| | 288 | |
| | 289 | #define thread_set_timer_deadline(a) \ |
| | 290 | thread_set_timer_deadline(__OSAbsoluteTime(a)) |
| | 291 | |
| | 292 | #endif /* ABSOLUTETIME_SCALAR_TYPE */ |
| | 293 | |
| | 294 | #endif /* MACH_KERNEL_PRIVATE */ |
| | 295 | |
| | 296 | #endif /* KERNEL_PRIVATE */ |
| | 297 | |
| | 298 | __END_DECLS |
| | 299 | |
| | 300 | #endif /* _KERN_SCHED_PRIM_H_ */ |
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