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5856e12e69
fork. (On my machine, fork is about 240usecs, vfork is 78usecs.) Implement rfork(!RFPROC !RFMEM), which allows a thread to divorce its memory from the other threads of a group. Implement rfork(!RFPROC RFCFDG), which closes all file descriptors, eliminating possible existing shares with other threads/processes. Implement rfork(!RFPROC RFFDG), which divorces the file descriptors for a thread from the rest of the group. Fix the case where a thread does an exec. It is almost nonsense for a thread to modify the other threads address space by an exec, so we now automatically divorce the address space before modifying it.
137 lines
5.7 KiB
C
137 lines
5.7 KiB
C
/*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* The Mach Operating System project at Carnegie-Mellon University.
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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 University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)pmap.h 8.1 (Berkeley) 6/11/93
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*
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*
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Avadis Tevanian, Jr.
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* $Id: pmap.h,v 1.19 1997/02/22 09:48:04 peter Exp $
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*/
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/*
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* Machine address mapping definitions -- machine-independent
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* section. [For machine-dependent section, see "machine/pmap.h".]
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*/
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#ifndef _PMAP_VM_
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#define _PMAP_VM_
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/*
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* Each machine dependent implementation is expected to
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* keep certain statistics. They may do this anyway they
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* so choose, but are expected to return the statistics
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* in the following structure.
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*/
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struct pmap_statistics {
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long resident_count; /* # of pages mapped (total) */
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long wired_count; /* # of pages wired */
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};
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typedef struct pmap_statistics *pmap_statistics_t;
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#include <machine/pmap.h>
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#ifdef KERNEL
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void pmap_change_wiring __P((pmap_t, vm_offset_t, boolean_t));
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void pmap_clear_modify __P((vm_offset_t pa));
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void pmap_clear_reference __P((vm_offset_t pa));
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void pmap_copy __P((pmap_t, pmap_t, vm_offset_t, vm_size_t,
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vm_offset_t));
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void pmap_copy_page __P((vm_offset_t, vm_offset_t));
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void pmap_destroy __P((pmap_t));
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void pmap_enter __P((pmap_t, vm_offset_t, vm_offset_t, vm_prot_t,
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boolean_t));
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vm_offset_t pmap_extract __P((pmap_t, vm_offset_t));
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void pmap_growkernel __P((vm_offset_t));
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void pmap_init __P((vm_offset_t, vm_offset_t));
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boolean_t pmap_is_modified __P((vm_offset_t pa));
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boolean_t pmap_ts_referenced __P((vm_offset_t pa));
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void pmap_kenter __P((vm_offset_t, vm_offset_t));
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void pmap_kremove __P((vm_offset_t));
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vm_offset_t pmap_map __P((vm_offset_t, vm_offset_t, vm_offset_t, int));
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void pmap_object_init_pt __P((pmap_t pmap, vm_offset_t addr,
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vm_object_t object, vm_pindex_t pindex, vm_offset_t size,
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int pagelimit));
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boolean_t pmap_page_exists __P((pmap_t, vm_offset_t));
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void pmap_page_protect __P((vm_offset_t, vm_prot_t));
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void pmap_pageable __P((pmap_t, vm_offset_t, vm_offset_t,
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boolean_t));
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vm_offset_t pmap_phys_address __P((int));
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void pmap_pinit __P((pmap_t));
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void pmap_protect __P((pmap_t, vm_offset_t, vm_offset_t,
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vm_prot_t));
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void pmap_qenter __P((vm_offset_t, vm_page_t *, int));
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void pmap_qremove __P((vm_offset_t, int));
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void pmap_reference __P((pmap_t));
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void pmap_release __P((pmap_t));
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void pmap_remove __P((pmap_t, vm_offset_t, vm_offset_t));
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void pmap_remove_pages __P((pmap_t, vm_offset_t, vm_offset_t));
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void pmap_zero_page __P((vm_offset_t));
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void pmap_prefault __P((pmap_t pmap, vm_offset_t addra,
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vm_map_entry_t entry, vm_object_t object));
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int pmap_mincore __P((pmap_t pmap, vm_offset_t addr));
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void pmap_new_proc __P((struct proc *p));
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void pmap_dispose_proc __P((struct proc *p));
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void pmap_swapout_proc __P((struct proc *p));
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void pmap_swapin_proc __P((struct proc *p));
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void pmap_activate __P((struct proc *p));
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#endif /* KERNEL */
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#endif /* _PMAP_VM_ */
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