Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/sched_prim.h
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1 /* 2 * Mach Operating System 3 * Copyright (c) 1992,1991,1990,1989,1988,1987 Carnegie Mellon University 4 * All Rights Reserved. 5 * 6 * Permission to use, copy, modify and distribute this software and its 7 * documentation is hereby granted, provided that both the copyright 8 * notice and this permission notice appear in all copies of the 9 * software, derivative works or modified versions, and any portions 10 * thereof, and that both notices appear in supporting documentation. 11 * 12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 15 * 16 * Carnegie Mellon requests users of this software to return to 17 * 18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 19 * School of Computer Science 20 * Carnegie Mellon University 21 * Pittsburgh PA 15213-3890 22 * 23 * any improvements or extensions that they make and grant Carnegie Mellon 24 * the rights to redistribute these changes. 25 */ 26 /* 27 * HISTORY 28 * $Log: sched_prim.h,v $ 29 * Revision 2.10 93/03/09 10:55:24 danner 30 * A small GNUism to signify thread_syscall_return does not return. 31 * [93/03/06 af] 32 * 33 * Revision 2.9 93/01/14 17:36:24 danner 34 * Added function prototypes. 35 * [92/11/11 dbg] 36 * 37 * Revision 2.8 92/01/03 20:14:49 dbg 38 * Removed THREAD_SHOULD_TERMINATE (again). 39 * [91/12/19 dbg] 40 * 41 * Revision 2.7 91/05/18 14:33:14 rpd 42 * Added recompute_priorities. 43 * [91/03/31 rpd] 44 * 45 * Revision 2.6 91/05/14 16:46:40 mrt 46 * Correcting copyright 47 * 48 * Revision 2.5 91/03/16 14:51:26 rpd 49 * Added declarations of new functions. 50 * [91/02/24 rpd] 51 * 52 * Revision 2.4 91/02/05 17:29:09 mrt 53 * Changed to new Mach copyright 54 * [91/02/01 16:17:24 mrt] 55 * 56 * Revision 2.3 90/06/02 14:56:03 rpd 57 * Updated to new scheduling technology. 58 * [90/03/26 22:17:10 rpd] 59 * 60 * Revision 2.2 90/01/11 11:44:04 dbg 61 * Export thread_bind. 62 * [89/12/06 dbg] 63 * 64 * Revision 2.1 89/08/03 15:53:39 rwd 65 * Created. 66 * 67 * 29-Jun-88 David Golub (dbg) at Carnegie-Mellon University 68 * Removed THREAD_SHOULD_TERMINATE. 69 * 70 * 16-May-88 Michael Young (mwyoung) at Carnegie-Mellon University 71 * Added thread_wakeup_with_result routine; thread_wakeup 72 * is a special case. 73 * 74 * 16-Apr-88 Michael Young (mwyoung) at Carnegie-Mellon University 75 * Added THREAD_RESTART wait result value. 76 * 77 * 29-Feb-88 David Black (dlb) at Carnegie-Mellon University 78 * thread_setrun is now a real routine. 79 * 80 * 13-Oct-87 David Golub (dbg) at Carnegie-Mellon University 81 * Moved thread_will_wait and thread_go to sched_prim_macros.h, 82 * to avoid including thread.h everywhere. 83 * 84 * 5-Oct-87 David Golub (dbg) at Carnegie-Mellon University 85 * Created. Moved thread_will_wait and thread_go here from 86 * mach_ipc. 87 */ 88 /* 89 * File: sched_prim.h 90 * Author: David Golub 91 * 92 * Scheduling primitive definitions file 93 * 94 */ 95 96 #ifndef _KERN_SCHED_PRIM_H_ 97 #define _KERN_SCHED_PRIM_H_ 98 99 #include <mach/boolean.h> 100 #include <mach/message.h> /* for mach_msg_timeout_t */ 101 #include <kern/lock.h> 102 #include <kern/kern_types.h> /* for thread_t */ 103 104 /* 105 * Possible results of assert_wait - returned in 106 * current_thread()->wait_result. 107 */ 108 #define THREAD_AWAKENED 0 /* normal wakeup */ 109 #define THREAD_TIMED_OUT 1 /* timeout expired */ 110 #define THREAD_INTERRUPTED 2 /* interrupted by clear_wait */ 111 #define THREAD_RESTART 3 /* restart operation entirely */ 112 113 typedef void *event_t; /* wait event */ 114 115 typedef void (*continuation_t)(void); /* continuation */ 116 117 /* 118 * Exported interface to sched_prim.c. 119 */ 120 121 extern void sched_init(void); 122 123 extern void assert_wait( 124 event_t event, 125 boolean_t interruptible); 126 extern void clear_wait( 127 thread_t thread, 128 int result, 129 boolean_t interrupt_only); 130 extern void thread_sleep( 131 event_t event, 132 simple_lock_t lock, 133 boolean_t interruptible); 134 extern void thread_wakeup(); /* for function pointers */ 135 extern void thread_wakeup_prim( 136 event_t event, 137 boolean_t one_thread, 138 int result); 139 extern boolean_t thread_invoke( 140 thread_t old_thread, 141 continuation_t continuation, 142 thread_t new_thread); 143 extern void thread_block( 144 continuation_t continuation); 145 extern void thread_run( 146 continuation_t continuation, 147 thread_t new_thread); 148 extern void thread_set_timeout( 149 int t); 150 extern void thread_setrun( 151 thread_t thread, 152 boolean_t may_preempt); 153 extern void thread_dispatch( 154 thread_t thread); 155 extern void thread_continue( 156 thread_t old_thread); 157 extern void thread_go( 158 thread_t thread); 159 extern void thread_will_wait( 160 thread_t thread); 161 extern void thread_will_wait_with_timeout( 162 thread_t thread, 163 mach_msg_timeout_t msecs); 164 extern boolean_t thread_handoff( 165 thread_t old_thread, 166 continuation_t continuation, 167 thread_t new_thread); 168 extern void recompute_priorities(); 169 170 /* 171 * Routines defined as macros 172 */ 173 174 #define thread_wakeup(x) \ 175 thread_wakeup_prim((x), FALSE, THREAD_AWAKENED) 176 #define thread_wakeup_with_result(x, z) \ 177 thread_wakeup_prim((x), FALSE, (z)) 178 #define thread_wakeup_one(x) \ 179 thread_wakeup_prim((x), TRUE, THREAD_AWAKENED) 180 181 /* 182 * Machine-dependent code must define these functions. 183 */ 184 185 extern void thread_bootstrap_return(void); 186 extern void thread_exception_return(void); 187 #ifdef __GNUC__ 188 extern void __volatile__ thread_syscall_return(kern_return_t); 189 #else 190 extern void thread_syscall_return(kern_return_t); 191 #endif 192 extern thread_t switch_context( 193 thread_t old_thread, 194 continuation_t continuation, 195 thread_t new_thread); 196 extern void stack_handoff( 197 thread_t old_thread, 198 thread_t new_thread); 199 200 /* 201 * These functions are either defined in kern/thread.c 202 * via machine-dependent stack_attach and stack_detach functions, 203 * or are defined directly by machine-dependent code. 204 */ 205 206 extern void stack_alloc( 207 thread_t thread, 208 void (*resume)(thread_t)); 209 extern boolean_t stack_alloc_try( 210 thread_t thread, 211 void (*resume)(thread_t)); 212 extern void stack_free( 213 thread_t thread); 214 215 /* 216 * Convert a timeout in milliseconds (mach_msg_timeout_t) 217 * to a timeout in ticks (for use by set_timeout). 218 * This conversion rounds UP so that small timeouts 219 * at least wait for one tick instead of not waiting at all. 220 */ 221 222 #define convert_ipc_timeout_to_ticks(millis) \ 223 (((millis) * hz + 999) / 1000) 224 225 #endif /* _KERN_SCHED_PRIM_H_ */
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