sleepq.c revision 1.2.6.3
1 1.2.6.3 yamt /* $NetBSD: sleepq.c,v 1.2.6.3 2010/03/11 15:04:38 yamt Exp $ */ 2 1.2.6.2 yamt 3 1.2.6.2 yamt /* 4 1.2.6.2 yamt * Copyright (c) 2008 Antti Kantee. All Rights Reserved. 5 1.2.6.2 yamt * 6 1.2.6.2 yamt * Redistribution and use in source and binary forms, with or without 7 1.2.6.2 yamt * modification, are permitted provided that the following conditions 8 1.2.6.2 yamt * are met: 9 1.2.6.2 yamt * 1. Redistributions of source code must retain the above copyright 10 1.2.6.2 yamt * notice, this list of conditions and the following disclaimer. 11 1.2.6.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 12 1.2.6.2 yamt * notice, this list of conditions and the following disclaimer in the 13 1.2.6.2 yamt * documentation and/or other materials provided with the distribution. 14 1.2.6.2 yamt * 15 1.2.6.2 yamt * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 16 1.2.6.2 yamt * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 1.2.6.2 yamt * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 1.2.6.2 yamt * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 1.2.6.2 yamt * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 1.2.6.2 yamt * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 1.2.6.2 yamt * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 1.2.6.2 yamt * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 1.2.6.2 yamt * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 1.2.6.2 yamt * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 1.2.6.2 yamt * SUCH DAMAGE. 26 1.2.6.2 yamt */ 27 1.2.6.2 yamt 28 1.2.6.2 yamt #include <sys/cdefs.h> 29 1.2.6.3 yamt __KERNEL_RCSID(0, "$NetBSD: sleepq.c,v 1.2.6.3 2010/03/11 15:04:38 yamt Exp $"); 30 1.2.6.2 yamt 31 1.2.6.2 yamt #include <sys/param.h> 32 1.2.6.2 yamt #include <sys/condvar.h> 33 1.2.6.2 yamt #include <sys/mutex.h> 34 1.2.6.3 yamt #include <sys/once.h> 35 1.2.6.2 yamt #include <sys/queue.h> 36 1.2.6.2 yamt #include <sys/sleepq.h> 37 1.2.6.2 yamt #include <sys/syncobj.h> 38 1.2.6.2 yamt 39 1.2.6.3 yamt #include "rump_private.h" 40 1.2.6.3 yamt 41 1.2.6.2 yamt /* 42 1.2.6.2 yamt * Flimsy and minimalistic sleepq implementation. This is implemented 43 1.2.6.2 yamt * only for the use of callouts in kern_timeout.c. locking etc is 44 1.2.6.2 yamt * completely incorrect, horrible, etc etc etc. 45 1.2.6.2 yamt */ 46 1.2.6.2 yamt 47 1.2.6.2 yamt syncobj_t sleep_syncobj; 48 1.2.6.2 yamt static kcondvar_t sq_cv; 49 1.2.6.3 yamt 50 1.2.6.3 yamt static int 51 1.2.6.3 yamt sqinit1(void) 52 1.2.6.3 yamt { 53 1.2.6.3 yamt 54 1.2.6.3 yamt cv_init(&sq_cv, "sleepq"); 55 1.2.6.3 yamt 56 1.2.6.3 yamt return 0; 57 1.2.6.3 yamt } 58 1.2.6.2 yamt 59 1.2.6.2 yamt void 60 1.2.6.2 yamt sleepq_init(sleepq_t *sq) 61 1.2.6.2 yamt { 62 1.2.6.3 yamt ONCE_DECL(sqctl); 63 1.2.6.2 yamt 64 1.2.6.3 yamt RUN_ONCE(&sqctl, sqinit1); 65 1.2.6.2 yamt 66 1.2.6.3 yamt TAILQ_INIT(sq); 67 1.2.6.2 yamt } 68 1.2.6.2 yamt 69 1.2.6.2 yamt void 70 1.2.6.2 yamt sleepq_enqueue(sleepq_t *sq, wchan_t wc, const char *wmsg, syncobj_t *sob) 71 1.2.6.2 yamt { 72 1.2.6.2 yamt struct lwp *l = curlwp; 73 1.2.6.2 yamt 74 1.2.6.2 yamt l->l_wchan = wc; 75 1.2.6.3 yamt l->l_sleepq = sq; 76 1.2.6.2 yamt TAILQ_INSERT_TAIL(sq, l, l_sleepchain); 77 1.2.6.2 yamt } 78 1.2.6.2 yamt 79 1.2.6.2 yamt int 80 1.2.6.3 yamt sleepq_block(int timo, bool catch) 81 1.2.6.2 yamt { 82 1.2.6.2 yamt struct lwp *l = curlwp; 83 1.2.6.3 yamt int error = 0; 84 1.2.6.3 yamt kmutex_t *mp = l->l_mutex; 85 1.2.6.3 yamt int biglocks = l->l_biglocks; 86 1.2.6.3 yamt 87 1.2.6.3 yamt while (l->l_wchan) { 88 1.2.6.3 yamt if ((error=cv_timedwait(&sq_cv, mp, timo)) == EWOULDBLOCK) { 89 1.2.6.3 yamt TAILQ_REMOVE(l->l_sleepq, l, l_sleepchain); 90 1.2.6.3 yamt l->l_wchan = NULL; 91 1.2.6.3 yamt } 92 1.2.6.3 yamt } 93 1.2.6.3 yamt mutex_spin_exit(mp); 94 1.2.6.2 yamt 95 1.2.6.3 yamt if (biglocks) 96 1.2.6.3 yamt KERNEL_LOCK(biglocks, curlwp); 97 1.2.6.2 yamt 98 1.2.6.3 yamt return error; 99 1.2.6.2 yamt } 100 1.2.6.2 yamt 101 1.2.6.2 yamt lwp_t * 102 1.2.6.2 yamt sleepq_wake(sleepq_t *sq, wchan_t wchan, u_int expected, kmutex_t *mp) 103 1.2.6.2 yamt { 104 1.2.6.3 yamt struct lwp *l, *l_next; 105 1.2.6.2 yamt bool found = false; 106 1.2.6.2 yamt 107 1.2.6.3 yamt if (__predict_false(expected != -1)) 108 1.2.6.3 yamt panic("sleepq_wake: \"expected\" not supported"); 109 1.2.6.3 yamt 110 1.2.6.3 yamt for (l = TAILQ_FIRST(sq); l; l = l_next) { 111 1.2.6.3 yamt l_next = TAILQ_NEXT(l, l_sleepchain); 112 1.2.6.2 yamt if (l->l_wchan == wchan) { 113 1.2.6.2 yamt found = true; 114 1.2.6.2 yamt l->l_wchan = NULL; 115 1.2.6.3 yamt TAILQ_REMOVE(sq, l, l_sleepchain); 116 1.2.6.2 yamt } 117 1.2.6.2 yamt } 118 1.2.6.2 yamt if (found) 119 1.2.6.2 yamt cv_broadcast(&sq_cv); 120 1.2.6.2 yamt 121 1.2.6.2 yamt mutex_spin_exit(mp); 122 1.2.6.2 yamt return NULL; 123 1.2.6.2 yamt } 124 1.2.6.2 yamt 125 1.2.6.3 yamt void 126 1.2.6.3 yamt sleepq_unsleep(struct lwp *l, bool cleanup) 127 1.2.6.3 yamt { 128 1.2.6.3 yamt 129 1.2.6.3 yamt l->l_wchan = NULL; 130 1.2.6.3 yamt TAILQ_REMOVE(l->l_sleepq, l, l_sleepchain); 131 1.2.6.3 yamt cv_broadcast(&sq_cv); 132 1.2.6.3 yamt 133 1.2.6.3 yamt if (cleanup) { 134 1.2.6.3 yamt mutex_spin_exit(l->l_mutex); 135 1.2.6.3 yamt } 136 1.2.6.3 yamt } 137 1.2.6.3 yamt 138 1.2.6.3 yamt /* 139 1.2.6.3 yamt * Thread scheduler handles priorities. Therefore no action here. 140 1.2.6.3 yamt * (maybe do something if we're deperate?) 141 1.2.6.3 yamt */ 142 1.2.6.3 yamt void 143 1.2.6.3 yamt sleepq_changepri(struct lwp *l, pri_t pri) 144 1.2.6.3 yamt { 145 1.2.6.3 yamt 146 1.2.6.3 yamt } 147 1.2.6.3 yamt 148 1.2.6.3 yamt void 149 1.2.6.3 yamt sleepq_lendpri(struct lwp *l, pri_t pri) 150 1.2.6.3 yamt { 151 1.2.6.3 yamt 152 1.2.6.3 yamt } 153 1.2.6.3 yamt 154 1.2.6.3 yamt struct lwp * 155 1.2.6.3 yamt syncobj_noowner(wchan_t wc) 156 1.2.6.3 yamt { 157 1.2.6.3 yamt 158 1.2.6.3 yamt return NULL; 159 1.2.6.3 yamt } 160 1.2.6.3 yamt 161 1.2.6.2 yamt /* 162 1.2.6.3 yamt * XXX: used only by callout, therefore here. should try to use 163 1.2.6.3 yamt * one in kern_lwp directly. 164 1.2.6.2 yamt */ 165 1.2.6.2 yamt kmutex_t * 166 1.2.6.2 yamt lwp_lock_retry(struct lwp *l, kmutex_t *old) 167 1.2.6.2 yamt { 168 1.2.6.2 yamt 169 1.2.6.3 yamt while (l->l_mutex != old) { 170 1.2.6.3 yamt mutex_spin_exit(old); 171 1.2.6.3 yamt old = l->l_mutex; 172 1.2.6.3 yamt mutex_spin_enter(old); 173 1.2.6.3 yamt } 174 1.2.6.2 yamt return old; 175 1.2.6.2 yamt } 176
Indexes created Thu Oct 02 10:09:58 GMT 2025