e7045955c7
an offset between ss_sp and struct sa_stackinfo_t (located in struct __pthread_st) when calling sa_register. The kernel increments the sast_gen counter in struct sastack when an upcall stack is used. libpthread increments the sasi_stackgen counter in struct sa_stackinfo_t when an upcall stack is freed. The kernel compares the two counters to decide if a stack is free or in use. - add struct sa_stackinfo_t with sasi_stackgen to count stack use in userland - add sast_gen to struct sastack to count stack use in kernel - add SA_FLAG_STACKINFO to enable the stackinfo_offset argument in the sa_register syscall - add sa_stackinfo_offset to struct sadata for offset between ss_sp and struct sa_stackinfo_t - add ssize_t stackinfo_offset argument to sa_register, initialize struct sadata's sa_stackinfo_offset from it if SA_FLAG_STACKINFO is set - add sa_getstack, sa_getstack0, sa_stackused and sa_setstackfree functions to find/use/free upcall stacks and use these where appropriate - don't record stack for upcall in sa_upcall0 - pass sau to sa_switchcall instead of l2 (l2 = curlwp in sa_switchcall) - add sa_vp_blocker to struct sadata to pass recently blocked lwp to sa_switchcall - delay finding a stack for blocked upcalls to sa_switchcall - add sa_stacknext to struct sadata pointing to next most likely free upcall stack; also g/c sa_stackslist in struct sadata and sast_list in struct sastack - add L_SA_WOKEN flag: LWP is on sa_woken queue - add L_SA_RECYCLE flag: LWP should be recycled in sa_setwoken - replace l_upcallstack with L_SA_WOKEN/L_SA_RECYCLE/L_SA_BLOCKING flags - g/c now unused sast_blocker in struct sastack - make sa_switchcall, sa_upcall0 and sa_upcall_getstate static in kern_sa.c - call sa_upcall_userret only once in userret - split sa_makeupcalls out of sa_upcall_userret and use to process the sa_upcalls queue - on process exit: mark LWPs sleeping in saunblock interruptible; also there are no LWPs sleeping on l->l_upcallstack anymore; also clear sa_wokenq_head to prevent unblocked upcalls additional changes: - cleanup timerupcall sa_vp == curlwp check - add check in sa_yield if we didn't block on our way here and we wouldn't any longer be the LWP on the VP - invalidate sa_vp_ofaultaddr after resolving pagefault
71 lines
2.7 KiB
C
71 lines
2.7 KiB
C
/* $NetBSD: sa.h,v 1.4 2004/01/02 18:52:17 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_SA_H
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#define _SYS_SA_H
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#include <sys/ucontext.h>
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struct sa_t {
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ucontext_t *sa_context;
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int sa_id;
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int sa_cpu;
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};
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/* kernel known per upcall stack data */
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struct sa_stackinfo_t {
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__volatile unsigned int sasi_stackgen; /* stack generation counter */
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};
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typedef void (*sa_upcall_t)(int, struct sa_t *[], int, int, void *);
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#define SA_UPCALL_NEWPROC 0
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#define SA_UPCALL_PREEMPTED 1
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#define SA_UPCALL_BLOCKED 2
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#define SA_UPCALL_UNBLOCKED 3
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#define SA_UPCALL_SIGNAL 4
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#define SA_UPCALL_SIGEV 5
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#define SA_UPCALL_USER 6
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#define SA_UPCALL_NUPCALLS 7
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#define SA_FLAG_PREEMPT 0x0001 /* Generate upcalls on a vanilla preempt() */
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#define SA_FLAG_STACKINFO 0x010000 /* Use stackinfo for upcall stack return */
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#endif /* !_SYS_SA_H */
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