c08e54b26b
- prevent BLOCKED upcalls on double page faults and during upcalls - make libpthread handle blocked threads which hold locks - prevent UNBLOCKED upcalls from overtaking their BLOCKED upcall this adds a new syscall sa_unblockyield see also http://mail-index.netbsd.org/tech-kern/2003/09/15/0020.html
195 lines
6.9 KiB
C
195 lines
6.9 KiB
C
/* $NetBSD: lwp.h,v 1.11 2003/09/16 13:46:26 cl Exp $ */
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/*-
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Nathan J. Williams.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _SYS_LWP_H
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#define _SYS_LWP_H
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#if defined(_KERNEL)
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#include <machine/cpu.h> /* curcpu() and cpu_info */
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#endif
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#include <machine/proc.h> /* Machine-dependent proc substruct. */
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#include <sys/queue.h>
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#include <sys/callout.h>
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#include <sys/ucontext.h>
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struct lwp {
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struct lwp *l_forw; /* Doubly-linked run/sleep queue. */
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struct lwp *l_back;
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LIST_ENTRY(lwp) l_list; /* Entry on list of all LWPs. */
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LIST_ENTRY(lwp) l_zlist; /* Entry on zombie list. */
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struct proc *l_proc; /* Process with which we are associated. */
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LIST_ENTRY(lwp) l_sibling; /* Entry on process's list of LWPs. */
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struct cpu_info * __volatile l_cpu; /* CPU we're running on if
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SONPROC */
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int l_flag;
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int l_stat;
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lwpid_t l_lid; /* LWP identifier; local to process. */
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#define l_startzero l_swtime
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u_int l_swtime; /* Time swapped in or out. */
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u_int l_slptime; /* Time since last blocked. */
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const void *l_wchan; /* Sleep address. */
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struct callout l_tsleep_ch; /* callout for tsleep */
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const char *l_wmesg; /* Reason for sleep. */
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int l_holdcnt; /* If non-zero, don't swap. */
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void *l_ctxlink; /* uc_link {get,set}context */
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int l_dupfd; /* Sideways return value from cloning devices XXX */
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void *l_upcallstack; /* Upcall stack used during blocking upcall */
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#define l_endzero l_priority
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#define l_startcopy l_priority
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u_char l_priority; /* Process priority. */
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u_char l_usrpri; /* User-priority based on p_cpu and p_nice. */
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#define l_endcopy l_private
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void *l_private; /* svr4-style lwp-private data */
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#ifdef notyet
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void *l_emuldata; /* kernel lwp-private data */
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#endif
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int l_locks; /* DEBUG: lockmgr count of held locks */
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struct user *l_addr; /* Kernel virtual addr of u-area (PROC ONLY). */
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struct mdlwp l_md; /* Any machine-dependent fields. */
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};
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LIST_HEAD(lwplist, lwp); /* a list of LWPs */
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extern struct lwplist alllwp; /* List of all LWPs. */
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extern struct lwplist deadlwp; /* */
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extern struct lwplist zomblwp;
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extern struct pool lwp_pool; /* memory pool for LWPs */
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extern struct pool lwp_uc_pool; /* memory pool for LWP startup args */
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extern struct lwp lwp0; /* LWP for proc0 */
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/* These flags are kept in l_flag. */
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#define L_INMEM 0x00004 /* Loaded into memory. */
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#define L_SELECT 0x00040 /* Selecting; wakeup/waiting danger. */
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#define L_SINTR 0x00080 /* Sleep is interruptible. */
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#define L_TIMEOUT 0x00400 /* Timing out during sleep. */
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#define L_BIGLOCK 0x80000 /* LWP needs kernel "big lock" to run */
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#define L_SA 0x100000 /* Scheduler activations LWP */
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#define L_SA_UPCALL 0x200000 /* SA upcall is pending */
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#define L_SA_BLOCKING 0x400000 /* Blocking in tsleep() */
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#define L_DETACHED 0x800000 /* Won't be waited for. */
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#define L_SA_WANTS_VP 0x1000000 /* SA LWP wants a virtual processor */
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#define L_CANCELLED 0x2000000 /* tsleep should not sleep */
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#define L_SA_PAGEFAULT 0x4000000 /* SA LWP in pagefault handler */
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/*
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* Status values.
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*
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* A note about SRUN and SONPROC: SRUN indicates that a process is
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* runnable but *not* yet running, i.e. is on a run queue. SONPROC
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* indicates that the process is actually executing on a CPU, i.e.
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* it is no longer on a run queue.
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*/
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#define LSIDL 1 /* Process being created by fork. */
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#define LSRUN 2 /* Currently runnable. */
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#define LSSLEEP 3 /* Sleeping on an address. */
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#define LSSTOP 4 /* Process debugging or suspension. */
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#define LSZOMB 5 /* Awaiting collection by parent. */
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#define LSDEAD 6 /* Process is almost a zombie. */
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#define LSONPROC 7 /* Process is currently on a CPU. */
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#define LSSUSPENDED 8 /* Not running, not signalable. */
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#ifdef _KERNEL
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#define PHOLD(l) \
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do { \
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if ((l)->l_holdcnt++ == 0 && ((l)->l_flag & L_INMEM) == 0) \
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uvm_swapin(l); \
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} while (/* CONSTCOND */ 0)
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#define PRELE(l) (--(l)->l_holdcnt)
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void preempt (int);
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int mi_switch (struct lwp *, struct lwp *);
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#ifndef remrunqueue
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void remrunqueue (struct lwp *);
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#endif
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void resetpriority (struct lwp *);
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void setrunnable (struct lwp *);
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#ifndef setrunqueue
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void setrunqueue (struct lwp *);
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#endif
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#ifndef nextrunqueue
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struct lwp *nextrunqueue(void);
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#endif
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void unsleep (struct lwp *);
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#ifndef cpu_switch
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int cpu_switch (struct lwp *, struct lwp *);
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#endif
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#ifndef cpu_switchto
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void cpu_switchto (struct lwp *, struct lwp *);
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#endif
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int newlwp(struct lwp *, struct proc *, vaddr_t, int /* XXX boolean_t */, int,
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void *, size_t, void (*)(void *), void *, struct lwp **);
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/* Flags for _lwp_wait1 */
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#define LWPWAIT_EXITCONTROL 0x00000001
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int lwp_wait1(struct lwp *, lwpid_t, lwpid_t *, int);
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void lwp_continue(struct lwp *);
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void cpu_setfunc(struct lwp *, void (*)(void *), void *);
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void startlwp(void *);
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void upcallret(struct lwp *);
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void lwp_exit (struct lwp *);
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void lwp_exit2 (struct lwp *);
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struct lwp *proc_representative_lwp(struct proc *);
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#endif /* _KERNEL */
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/* Flags for _lwp_create(), as per Solaris. */
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#define LWP_DETACHED 0x00000040
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#define LWP_SUSPENDED 0x00000080
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#define __LWP_ASLWP 0x00000100 /* XXX more icky signal semantics */
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#endif /* !_SYS_LWP_H_ */
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