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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 /*
     28  * The enclosed is a private interface between system libraries and
     29  * the kernel.  It should not be used in any other way.  It may be
     30  * changed without notice in a minor release of Solaris.
     31  */
     32 
     33 #ifndef	_SYS_SCHEDCTL_H
     34 #define	_SYS_SCHEDCTL_H
     35 
     36 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     37 
     38 #ifdef	__cplusplus
     39 extern "C" {
     40 #endif
     41 
     42 #if !defined(_ASM)
     43 
     44 #include <sys/types.h>
     45 #include <sys/processor.h>
     46 
     47 /*
     48  * This "public" portion of the sc_shared data is used by libsched/libc.
     49  */
     50 typedef struct sc_public {
     51 	volatile short	sc_nopreempt;
     52 	volatile short	sc_yield;
     53 } sc_public_t;
     54 
     55 /*
     56  * The private portion of the sc_shared data is for
     57  * use by user-level threading support code in libc.
     58  * Java has a contract to look at sc_state and sc_cpu (PSARC/2005/351).
     59  */
     60 typedef struct sc_shared {
     61 	volatile ushort_t sc_state;	/* current LWP state */
     62 	volatile char	sc_sigblock;	/* all signals blocked */
     63 	volatile uchar_t sc_flgs;	/* set only by curthread; see below */
     64 	volatile processorid_t sc_cpu;	/* last CPU on which LWP ran */
     65 	volatile char	sc_cid;		/* scheduling class id */
     66 	volatile char	sc_cpri;	/* class priority, -128..127 */
     67 	volatile uchar_t sc_priority;	/* dispatch priority, 0..255 */
     68 	char		sc_pad;
     69 	sc_public_t	sc_preemptctl;	/* preemption control data */
     70 } sc_shared_t;
     71 
     72 /* sc_flgs */
     73 #define	SC_PARK_FLG	0x01	/* calling lwp_park() */
     74 #define	SC_CANCEL_FLG	0x02	/* cancel pending and not disabled */
     75 #define	SC_EINTR_FLG	0x04	/* EINTR returned due to SC_CANCEL_FLG */
     76 
     77 /*
     78  * Possible state settings.  These are same as the kernel thread states
     79  * except there is no zombie state.
     80  */
     81 #define	SC_FREE		0x00
     82 #define	SC_SLEEP	0x01
     83 #define	SC_RUN		0x02
     84 #define	SC_ONPROC	0x04
     85 #define	SC_STOPPED	0x10
     86 #define	SC_WAIT		0x20
     87 
     88 /* preemption control settings */
     89 #define	SC_MAX_TICKS	2		/* max time preemption can be blocked */
     90 
     91 #ifdef	_KERNEL
     92 caddr_t	schedctl(void);
     93 void	schedctl_init(void);
     94 void	schedctl_lwp_cleanup(kthread_t *);
     95 void	schedctl_proc_cleanup(void);
     96 int	schedctl_get_nopreempt(kthread_t *);
     97 void	schedctl_set_nopreempt(kthread_t *, short);
     98 void	schedctl_set_yield(kthread_t *, short);
     99 void	schedctl_set_cidpri(kthread_t *);
    100 int	schedctl_sigblock(kthread_t *);
    101 void	schedctl_finish_sigblock(kthread_t *);
    102 int	schedctl_cancel_pending(void);
    103 void	schedctl_cancel_eintr(void);
    104 int	schedctl_is_park(void);
    105 void	schedctl_set_park(void);
    106 void	schedctl_unpark(void);
    107 #endif	/* _KERNEL */
    108 
    109 #endif	/* !defined(_ASM) */
    110 
    111 #ifdef	__cplusplus
    112 }
    113 #endif
    114 
    115 #endif	/* _SYS_SCHEDCTL_H */
    116