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/*
* Mach Operating System
* Copyright (c) 1992,1991,1990,1989,1988,1987 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* File: sched_prim.h
* Author: David Golub
*
* Scheduling primitive definitions file
*
*/
#ifndef _KERN_SCHED_PRIM_H_
#define _KERN_SCHED_PRIM_H_
#include <mach/boolean.h>
#include <mach/message.h> /* for mach_msg_timeout_t */
#include <kern/lock.h>
#include <kern/kern_types.h> /* for thread_t */
/*
* Possible results of assert_wait - returned in
* current_thread()->wait_result.
*/
#define THREAD_AWAKENED 0 /* normal wakeup */
#define THREAD_TIMED_OUT 1 /* timeout expired */
#define THREAD_INTERRUPTED 2 /* interrupted by clear_wait */
#define THREAD_RESTART 3 /* restart operation entirely */
typedef void *event_t; /* wait event */
typedef void (*continuation_t)(void); /* continuation */
/*
* Exported interface to sched_prim.c.
*/
extern void sched_init(void);
extern void assert_wait(
event_t event,
boolean_t interruptible);
extern void clear_wait(
thread_t thread,
int result,
boolean_t interrupt_only);
extern void thread_sleep(
event_t event,
simple_lock_t lock,
boolean_t interruptible);
extern void thread_wakeup(); /* for function pointers */
extern void thread_wakeup_prim(
event_t event,
boolean_t one_thread,
int result);
extern boolean_t thread_invoke(
thread_t old_thread,
continuation_t continuation,
thread_t new_thread);
extern void thread_block(
continuation_t continuation);
extern void thread_run(
continuation_t continuation,
thread_t new_thread);
extern void thread_set_timeout(
int t);
extern void thread_setrun(
thread_t thread,
boolean_t may_preempt);
extern void thread_dispatch(
thread_t thread);
extern void thread_continue(
thread_t old_thread);
extern void thread_go(
thread_t thread);
extern void thread_will_wait(
thread_t thread);
extern void thread_will_wait_with_timeout(
thread_t thread,
mach_msg_timeout_t msecs);
extern boolean_t thread_handoff(
thread_t old_thread,
continuation_t continuation,
thread_t new_thread);
extern void recompute_priorities();
/*
* Routines defined as macros
*/
#define thread_wakeup(x) \
thread_wakeup_prim((x), FALSE, THREAD_AWAKENED)
#define thread_wakeup_with_result(x, z) \
thread_wakeup_prim((x), FALSE, (z))
#define thread_wakeup_one(x) \
thread_wakeup_prim((x), TRUE, THREAD_AWAKENED)
/*
* Machine-dependent code must define these functions.
*/
extern void thread_bootstrap_return(void);
extern void thread_exception_return(void);
#ifdef __GNUC__
extern void __attribute__((__noreturn__)) thread_syscall_return(kern_return_t);
#else
extern void thread_syscall_return(kern_return_t);
#endif
extern thread_t switch_context(
thread_t old_thread,
continuation_t continuation,
thread_t new_thread);
extern void stack_handoff(
thread_t old_thread,
thread_t new_thread);
/*
* These functions are either defined in kern/thread.c
* via machine-dependent stack_attach and stack_detach functions,
* or are defined directly by machine-dependent code.
*/
extern void stack_alloc(
thread_t thread,
void (*resume)(thread_t));
extern boolean_t stack_alloc_try(
thread_t thread,
void (*resume)(thread_t));
extern void stack_free(
thread_t thread);
/*
* Convert a timeout in milliseconds (mach_msg_timeout_t)
* to a timeout in ticks (for use by set_timeout).
* This conversion rounds UP so that small timeouts
* at least wait for one tick instead of not waiting at all.
*/
#define convert_ipc_timeout_to_ticks(millis) \
(((millis) * hz + 999) / 1000)
#endif /* _KERN_SCHED_PRIM_H_ */
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