lib/libthread_db/kse.h

   1 /*-
   2  * Copyright (C) 2001 Julian Elischer <julian@freebsd.org>
   3  * for the FreeBSD Foundation.
   4  *
   5  *  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice(s), this list of conditions and the following disclaimer as
  12  *    the first lines of this file unmodified other than the possible
  13  *    addition of one or more copyright notices.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice(s), this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
  19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21  * DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
  22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  25  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  28  * DAMAGE.
  29  *
  30  * $FreeBSD$
  31  */
  32
  33 #ifndef _SYS_KSE_H_
  34 #define _SYS_KSE_H_
  35
  36 #include <sys/ucontext.h>
  37 #include <sys/time.h>
  38 #include <sys/signal.h>
  39
  40 /*
  41  * This file defines the structures needed for communication between
  42  * the userland and the kernel when running a KSE-based threading system.
  43  * The only programs that should see this file are the user thread
  44  * scheduler (UTS) and the kernel.
  45  */
  46 struct kse_mailbox;
  47
  48 typedef void    kse_func_t(struct kse_mailbox *);
  49
  50 /*
  51  * Thread mailbox.
  52  *
  53  * This describes a user thread to the kernel scheduler.
  54  */
  55 struct kse_thr_mailbox {
  56         ucontext_t              tm_context;     /* User and machine context */
  57         uint32_t                tm_flags;       /* Thread flags */
  58         struct kse_thr_mailbox  *tm_next;       /* Next thread in list */
  59         void                    *tm_udata;      /* For use by the UTS */
  60         uint32_t                tm_uticks;      /* Time in userland */
  61         uint32_t                tm_sticks;      /* Time in kernel */
  62         siginfo_t               tm_syncsig;
  63         uint32_t                tm_dflags;      /* Debug flags */
  64         lwpid_t                 tm_lwp;         /* kernel thread UTS runs on */
  65         uint32_t                __spare__[6];
  66 };
  67
  68 /*
  69  * KSE mailbox.
  70  *
  71  * Communication path between the UTS and the kernel scheduler specific to
  72  * a single KSE.
  73  */
  74 struct kse_mailbox {
  75         uint32_t                km_version;     /* Mailbox version */
  76         struct kse_thr_mailbox  *km_curthread;  /* Currently running thread */
  77         struct kse_thr_mailbox  *km_completed;  /* Threads back from kernel */
  78         sigset_t                km_sigscaught;  /* Caught signals */
  79         uint32_t                km_flags;       /* Mailbox flags */
  80         kse_func_t              *km_func;       /* UTS function */
  81         stack_t                 km_stack;       /* UTS stack */
  82         void                    *km_udata;      /* For use by the UTS */
  83         struct timespec         km_timeofday;   /* Time of day */
  84         uint32_t                km_quantum;     /* Upcall quantum in msecs */
  85         lwpid_t                 km_lwp;         /* kernel thread UTS runs on */
  86         uint32_t                __spare2__[7];
  87 };
  88
  89 #define KSE_VER_0               0
  90 #define KSE_VERSION             KSE_VER_0
  91
  92 /* These flags are kept in km_flags */
  93 #define KMF_NOUPCALL            0x01
  94 #define KMF_NOCOMPLETED         0x02
  95 #define KMF_DONE                0x04
  96 #define KMF_BOUND               0x08
  97 #define KMF_WAITSIGEVENT        0x10
  98
  99 /* These flags are kept in tm_flags */
 100 #define TMF_NOUPCALL            0x01
 101
 102 /* These flags are kept in tm_dlfags */
 103 #define TMDF_SSTEP              0x01
 104 #define TMDF_SUSPEND            0x02
 105
 106 /* Flags for kse_switchin */
 107 #define KSE_SWITCHIN_SETTMBX    0x01
 108
 109 /* Commands for kse_thr_interrupt */
 110 #define KSE_INTR_INTERRUPT      1
 111 #define KSE_INTR_RESTART        2
 112 #define KSE_INTR_SENDSIG        3
 113 #define KSE_INTR_SIGEXIT        4
 114 #define KSE_INTR_DBSUSPEND      5
 115 #define KSE_INTR_EXECVE         6
 116
 117 struct kse_execve_args {
 118         sigset_t        sigmask;
 119         sigset_t        sigpend;
 120         char            *path;
 121         char            **argv;
 122         char            **envp;
 123         void            *reserved;
 124 };
 125
 126 #ifndef _KERNEL
 127 int     kse_create(struct kse_mailbox *, int);
 128 int     kse_exit(void);
 129 int     kse_release(struct timespec *);
 130 int     kse_thr_interrupt(struct kse_thr_mailbox *, int, long);
 131 int     kse_wakeup(struct kse_mailbox *);
 132 int     kse_switchin(struct kse_thr_mailbox *, int flags);
 133 #endif  /* !_KERNEL */
 134
 135 #endif  /* !_SYS_KSE_H_ */