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1.1 ! root 1: /* ! 2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. ! 3: * ! 4: * @APPLE_LICENSE_HEADER_START@ ! 5: * ! 6: * The contents of this file constitute Original Code as defined in and ! 7: * are subject to the Apple Public Source License Version 1.1 (the ! 8: * "License"). You may not use this file except in compliance with the ! 9: * License. Please obtain a copy of the License at ! 10: * http://www.apple.com/publicsource and read it before using this file. ! 11: * ! 12: * This Original Code and all software distributed under the License are ! 13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER ! 14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, ! 15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, ! 16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the ! 17: * License for the specific language governing rights and limitations ! 18: * under the License. ! 19: * ! 20: * @APPLE_LICENSE_HEADER_END@ ! 21: */ ! 22: /* ! 23: * @OSF_COPYRIGHT@ ! 24: */ ! 25: /* ! 26: * Mach Operating System ! 27: * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University ! 28: * All Rights Reserved. ! 29: * ! 30: * Permission to use, copy, modify and distribute this software and its ! 31: * documentation is hereby granted, provided that both the copyright ! 32: * notice and this permission notice appear in all copies of the ! 33: * software, derivative works or modified versions, and any portions ! 34: * thereof, and that both notices appear in supporting documentation. ! 35: * ! 36: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" ! 37: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR ! 38: * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. ! 39: * ! 40: * Carnegie Mellon requests users of this software to return to ! 41: * ! 42: * Software Distribution Coordinator or [email protected] ! 43: * School of Computer Science ! 44: * Carnegie Mellon University ! 45: * Pittsburgh PA 15213-3890 ! 46: * ! 47: * any improvements or extensions that they make and grant Carnegie Mellon ! 48: * the rights to redistribute these changes. ! 49: */ ! 50: /* ! 51: */ ! 52: /* ! 53: * File: sched_prim.h ! 54: * Author: David Golub ! 55: * ! 56: * Scheduling primitive definitions file ! 57: * ! 58: */ ! 59: ! 60: #ifndef _KERN_SCHED_PRIM_H_ ! 61: #define _KERN_SCHED_PRIM_H_ ! 62: ! 63: #include <mach/boolean.h> ! 64: #include <mach/machine/vm_types.h> ! 65: #include <mach/kern_return.h> ! 66: #include <kern/clock.h> ! 67: #include <kern/kern_types.h> ! 68: #include <kern/thread.h> ! 69: #include <kern/lock.h> ! 70: #include <kern/time_out.h> /*** ??? temp - remove me soon ***/ ! 71: #include <kern/cpu_data.h> ! 72: #include <kern/wait_queue.h> ! 73: ! 74: #ifdef MACH_KERNEL_PRIVATE ! 75: ! 76: #include <mach_ldebug.h> ! 77: /* ! 78: * Exported interface to sched_prim.c. ! 79: * A few of these functions are actually defined in ! 80: * ipc_sched.c, for historical reasons. ! 81: */ ! 82: ! 83: /* Initialize scheduler module */ ! 84: extern void sched_init(void); ! 85: ! 86: /* Called when timeout expires */ ! 87: extern void thread_timer_expire( ! 88: thread_t thread); ! 89: ! 90: /* ! 91: * Set up thread timeout element when thread is created. ! 92: */ ! 93: extern void thread_timer_setup( ! 94: thread_t thread); ! 95: ! 96: #define thread_bind_locked(thread, processor) \ ! 97: (thread)->bound_processor = (processor) ! 98: ! 99: /* ! 100: * Prevent a thread from restarting after it blocks interruptibly ! 101: */ ! 102: extern boolean_t thread_stop( ! 103: thread_t thread); ! 104: ! 105: /* ! 106: * wait for a thread to stop ! 107: */ ! 108: extern boolean_t thread_wait( ! 109: thread_t thread); ! 110: ! 111: /* Select a thread to run on a particular processor */ ! 112: extern thread_t thread_select( ! 113: processor_t myprocessor); ! 114: ! 115: extern void thread_go_locked( ! 116: thread_t thread, ! 117: int result); ! 118: ! 119: /* Stop old thread and run new thread */ ! 120: extern boolean_t thread_invoke( ! 121: thread_t old_thread, ! 122: thread_t new_thread, ! 123: int reason, ! 124: void (*continuation)(void)); ! 125: ! 126: /* Called when current thread is given new stack */ ! 127: extern void thread_continue( ! 128: thread_t old_thread); ! 129: ! 130: ! 131: /* Switch directly to a particular thread */ ! 132: extern void thread_run( ! 133: void (*continuation)(void), ! 134: thread_t new_thread); ! 135: ! 136: /* Dispatch a thread not on a run queue */ ! 137: extern void thread_dispatch( ! 138: thread_t thread); ! 139: ! 140: /* Invoke continuation */ ! 141: extern void call_continuation( ! 142: void (*continuation)(void)); ! 143: ! 144: /* Compute effective priority of the specified thread */ ! 145: extern void compute_priority( ! 146: thread_t thread, ! 147: int resched); ! 148: ! 149: /* Version of compute_priority for current thread or ! 150: * thread being manipuldated by scheduler. ! 151: */ ! 152: extern void compute_my_priority( ! 153: thread_t thread); ! 154: ! 155: /* Recompute priorities of all threads (done periodically) */ ! 156: extern void recompute_priorities(void); ! 157: ! 158: /* Update priority of thread that has been sleeping or suspended. ! 159: * Used to "catch up" with the system. ! 160: */ ! 161: extern void update_priority( ! 162: thread_t thread); ! 163: ! 164: /* Idle thread loop */ ! 165: extern void idle_thread(void); ! 166: ! 167: /* Scheduling thread loop */ ! 168: extern void sched_thread(void); ! 169: ! 170: /* ! 171: * thread_sleep_interlock: ! 172: * ! 173: * Cause the current thread to wait until the specified event ! 174: * occurs. The specified HW interlock is unlocked before releasing ! 175: * the cpu. (This is a convenient way to sleep without manually ! 176: * calling assert_wait). ! 177: */ ! 178: ! 179: #define thread_sleep_interlock(event, lock, interruptible) \ ! 180: MACRO_BEGIN \ ! 181: assert_wait(event, interruptible); \ ! 182: interlock_unlock(lock); \ ! 183: thread_block((void (*)(void)) 0); \ ! 184: MACRO_END ! 185: ! 186: /* ! 187: * Machine-dependent code must define these functions. ! 188: */ ! 189: ! 190: /* Start thread running */ ! 191: extern void thread_bootstrap_return(void); ! 192: ! 193: /* Return from exception */ ! 194: extern void thread_exception_return(void); ! 195: ! 196: extern thread_t switch_context( ! 197: thread_t old_thread, ! 198: void (*continuation)(void), ! 199: thread_t new_thread); ! 200: ! 201: /* Attach stack to thread */ ! 202: extern void machine_kernel_stack_init( ! 203: thread_t thread, ! 204: void (*continuation)(void)); ! 205: ! 206: extern void load_context( ! 207: thread_t thread); ! 208: ! 209: extern thread_act_t switch_act( ! 210: thread_act_t act); ! 211: ! 212: extern void machine_switch_act( ! 213: thread_t thread, ! 214: thread_act_t old, ! 215: thread_act_t new, ! 216: int cpu); ! 217: ! 218: /* ! 219: * These functions are either defined in kern/thread.c ! 220: * or are defined directly by machine-dependent code. ! 221: */ ! 222: ! 223: /* Allocate an activation stack */ ! 224: extern vm_offset_t stack_alloc(thread_t thread, void (*continuation)(void)); ! 225: ! 226: /* Free an activation stack */ ! 227: extern void stack_free(thread_t thread); ! 228: ! 229: /* Collect excess kernel stacks */ ! 230: extern void stack_collect(void); ! 231: ! 232: /* ! 233: * Temporary definitions needed for MK SP work-in-progress ! 234: */ ! 235: extern void set_pri( ! 236: thread_t thread, ! 237: int pri, ! 238: boolean_t resched); ! 239: ! 240: extern thread_t sched_thread_id; ! 241: ! 242: ! 243: /* Block current thread, indicating reason (Block or Quantum expiration) */ ! 244: extern int thread_block_reason( ! 245: void (*continuation)(void), ! 246: int reason); ! 247: ! 248: /* Make thread runnable */ ! 249: extern void thread_setrun( ! 250: thread_t thread, ! 251: boolean_t may_preempt, ! 252: boolean_t tail); ! 253: /* ! 254: * Flags for thread_setrun() ! 255: */ ! 256: ! 257: #define HEAD_Q 0 /* FALSE */ ! 258: #define TAIL_Q 1 /* TRUE */ ! 259: ! 260: #endif /* MACH_KERNEL_PRIVATE */ ! 261: ! 262: /* ! 263: ****************** Only exported until BSD stops using ******************** ! 264: */ ! 265: ! 266: /* ! 267: * Cancel a stop and continue the thread if necessary. ! 268: */ ! 269: extern void thread_unstop( ! 270: thread_t thread); ! 271: ! 272: /* Wake up thread directly, passing result */ ! 273: extern void clear_wait( ! 274: thread_t thread, ! 275: int result, ! 276: boolean_t interruptible); ! 277: ! 278: /* Bind thread to a particular processor */ ! 279: extern void thread_bind( ! 280: thread_t thread, ! 281: processor_t processor); ! 282: ! 283: ! 284: /* ! 285: * ********************* PUBLIC APIs ************************************ ! 286: */ ! 287: ! 288: /* Set timer for current thread */ ! 289: extern void thread_set_timer( ! 290: natural_t interval, ! 291: natural_t scale_factor); ! 292: ! 293: extern void thread_set_timer_deadline( ! 294: AbsoluteTime deadline); ! 295: ! 296: extern void thread_cancel_timer(void); ! 297: ! 298: /* ! 299: * thread_stop a thread then wait for it to stop (both of the above) ! 300: */ ! 301: extern boolean_t thread_stop_wait( ! 302: thread_t thread); ! 303: ! 304: /* Declare thread will wait on a particular event */ ! 305: extern void assert_wait( ! 306: event_t event, ! 307: int interruptflag); ! 308: ! 309: /* Assert that the thread intends to wait for a timeout */ ! 310: extern void assert_wait_timeout( ! 311: natural_t msecs, ! 312: int interruptflags); ! 313: ! 314: /* Wake up thread (or threads) waiting on a particular event */ ! 315: extern void thread_wakeup_prim( ! 316: event_t event, ! 317: boolean_t one_thread, ! 318: int result); ! 319: ! 320: /* Block current thread (Block reason) */ ! 321: extern int thread_block( ! 322: void (*continuation)(void)); ! 323: ! 324: ! 325: /* ! 326: * Routines defined as macros ! 327: */ ! 328: ! 329: #define thread_wakeup(x) \ ! 330: thread_wakeup_prim((x), FALSE, THREAD_AWAKENED) ! 331: #define thread_wakeup_with_result(x, z) \ ! 332: thread_wakeup_prim((x), FALSE, (z)) ! 333: #define thread_wakeup_one(x) \ ! 334: thread_wakeup_prim((x), TRUE, THREAD_AWAKENED) ! 335: ! 336: /* ! 337: * thread_sleep_mutex: ! 338: * ! 339: * Cause the current thread to wait until the specified event ! 340: * occurs. The specified mutex is unlocked before releasing ! 341: * the cpu. (This is a convenient way to sleep without manually ! 342: * calling assert_wait). ! 343: */ ! 344: ! 345: #define thread_sleep_mutex(event, lock, interruptible) \ ! 346: MACRO_BEGIN \ ! 347: assert_wait(event, interruptible); \ ! 348: mutex_unlock(lock); \ ! 349: thread_block((void (*)(void)) 0); \ ! 350: MACRO_END ! 351: ! 352: /* ! 353: * thread_sleep_simple_lock: ! 354: * ! 355: * Cause the current thread to wait until the specified event ! 356: * occurs. The specified simple_lock is unlocked before releasing ! 357: * the cpu. (This is a convenient way to sleep without manually ! 358: * calling assert_wait). ! 359: */ ! 360: ! 361: #define thread_sleep_simple_lock(event, lock, interruptible) \ ! 362: MACRO_BEGIN \ ! 363: assert_wait(event, interruptible); \ ! 364: simple_unlock(lock); \ ! 365: thread_block((void (*)(void)) 0); \ ! 366: MACRO_END ! 367: ! 368: ! 369: #endif /* _KERN_SCHED_PRIM_H_ */
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