1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 1997-2003 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate #ifndef _SYS_LCHAN_IMPL_H 28*0Sstevel@tonic-gate #define _SYS_LCHAN_IMPL_H 29*0Sstevel@tonic-gate 30*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 31*0Sstevel@tonic-gate 32*0Sstevel@tonic-gate #ifdef __cplusplus 33*0Sstevel@tonic-gate extern "C" { 34*0Sstevel@tonic-gate #endif 35*0Sstevel@tonic-gate 36*0Sstevel@tonic-gate #define LWPCHAN_CVPOOL 0 37*0Sstevel@tonic-gate #define LWPCHAN_MPPOOL 1 38*0Sstevel@tonic-gate 39*0Sstevel@tonic-gate #define LWPCHAN_INITIAL_BITS 2 /* 4 hash buckets */ 40*0Sstevel@tonic-gate #define LWPCHAN_MAX_BITS 10 /* 1024 hash buckets */ 41*0Sstevel@tonic-gate 42*0Sstevel@tonic-gate /* 43*0Sstevel@tonic-gate * An lwpchan entry translates a process-shared lwp sync object's 44*0Sstevel@tonic-gate * virtual address into its logical address, an lwpchan, previously 45*0Sstevel@tonic-gate * computed via as_getmemid(). 46*0Sstevel@tonic-gate */ 47*0Sstevel@tonic-gate typedef struct lwpchan_entry { 48*0Sstevel@tonic-gate caddr_t lwpchan_addr; /* virtual address */ 49*0Sstevel@tonic-gate uint16_t lwpchan_type; /* sync object type field */ 50*0Sstevel@tonic-gate uint16_t lwpchan_pool; /* LWPCHAN_CVPOOL/LWPCHAN_MPPOOL */ 51*0Sstevel@tonic-gate lwpchan_t lwpchan_lwpchan; /* unique logical address */ 52*0Sstevel@tonic-gate struct lwpchan_entry *lwpchan_next; /* hash chain */ 53*0Sstevel@tonic-gate } lwpchan_entry_t; 54*0Sstevel@tonic-gate 55*0Sstevel@tonic-gate /* 56*0Sstevel@tonic-gate * Hash bucket head. The mutex protects the consistency of the hash chain. 57*0Sstevel@tonic-gate * Also, p->p_lcp cannot be changed while any one hash bucket lock is held. 58*0Sstevel@tonic-gate * (The resizing thread must acquire all of the hash bucket locks.) 59*0Sstevel@tonic-gate */ 60*0Sstevel@tonic-gate typedef struct lwpchan_hashbucket { 61*0Sstevel@tonic-gate kmutex_t lwpchan_lock; 62*0Sstevel@tonic-gate lwpchan_entry_t *lwpchan_chain; 63*0Sstevel@tonic-gate } lwpchan_hashbucket_t; 64*0Sstevel@tonic-gate 65*0Sstevel@tonic-gate /* 66*0Sstevel@tonic-gate * Each process maintains a cache of lwpchan translations for sync objects 67*0Sstevel@tonic-gate * (lwp_mutex_t, lwp_cond_t, lwp_sema_t) that are shared between processes. 68*0Sstevel@tonic-gate * The lwpchan cache is a hash table used to look up previously-computed 69*0Sstevel@tonic-gate * lwpchan_t's by process virtual address. We keep this cache because we 70*0Sstevel@tonic-gate * believe that as_getmemid() is slow and we only need to call it once, 71*0Sstevel@tonic-gate * then remember the results. The hashing function is very simple, and 72*0Sstevel@tonic-gate * assumes an even distribution of sync objects within the process's 73*0Sstevel@tonic-gate * address space. When hash chains become too long, the cache is resized 74*0Sstevel@tonic-gate * on the fly. The cache is freed when the process exits or execs. 75*0Sstevel@tonic-gate */ 76*0Sstevel@tonic-gate typedef struct lwpchan_data { 77*0Sstevel@tonic-gate uint_t lwpchan_bits; /* number of bits */ 78*0Sstevel@tonic-gate uint_t lwpchan_size; /* 1 << lwpchan_bits */ 79*0Sstevel@tonic-gate uint_t lwpchan_mask; /* lwpchan_size - 1 */ 80*0Sstevel@tonic-gate uint_t lwpchan_entries; /* number of entries in the cache */ 81*0Sstevel@tonic-gate lwpchan_hashbucket_t *lwpchan_cache; 82*0Sstevel@tonic-gate struct lwpchan_data *lwpchan_next_data; 83*0Sstevel@tonic-gate } lwpchan_data_t; 84*0Sstevel@tonic-gate 85*0Sstevel@tonic-gate /* 86*0Sstevel@tonic-gate * exported functions 87*0Sstevel@tonic-gate */ 88*0Sstevel@tonic-gate void lwpchan_delete_mapping(proc_t *, caddr_t start, caddr_t end); 89*0Sstevel@tonic-gate void lwpchan_destroy_cache(int); 90*0Sstevel@tonic-gate 91*0Sstevel@tonic-gate #ifdef __cplusplus 92*0Sstevel@tonic-gate } 93*0Sstevel@tonic-gate #endif 94*0Sstevel@tonic-gate 95*0Sstevel@tonic-gate #endif /* _SYS_LCHAN_IMPL_H */ 96