klock.c revision 1.2.6.2
1 1.2.6.2 uebayasi /* $NetBSD: klock.c,v 1.2.6.2 2010/08/17 06:48:01 uebayasi Exp $ */ 2 1.2.6.2 uebayasi 3 1.2.6.2 uebayasi /* 4 1.2.6.2 uebayasi * Copyright (c) 2007-2010 Antti Kantee. All Rights Reserved. 5 1.2.6.2 uebayasi * 6 1.2.6.2 uebayasi * Development of this software was supported by the 7 1.2.6.2 uebayasi * Finnish Cultural Foundation. 8 1.2.6.2 uebayasi * 9 1.2.6.2 uebayasi * Redistribution and use in source and binary forms, with or without 10 1.2.6.2 uebayasi * modification, are permitted provided that the following conditions 11 1.2.6.2 uebayasi * are met: 12 1.2.6.2 uebayasi * 1. Redistributions of source code must retain the above copyright 13 1.2.6.2 uebayasi * notice, this list of conditions and the following disclaimer. 14 1.2.6.2 uebayasi * 2. Redistributions in binary form must reproduce the above copyright 15 1.2.6.2 uebayasi * notice, this list of conditions and the following disclaimer in the 16 1.2.6.2 uebayasi * documentation and/or other materials provided with the distribution. 17 1.2.6.2 uebayasi * 18 1.2.6.2 uebayasi * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 19 1.2.6.2 uebayasi * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 20 1.2.6.2 uebayasi * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 21 1.2.6.2 uebayasi * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 1.2.6.2 uebayasi * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 1.2.6.2 uebayasi * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 24 1.2.6.2 uebayasi * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 1.2.6.2 uebayasi * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 1.2.6.2 uebayasi * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 1.2.6.2 uebayasi * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 1.2.6.2 uebayasi * SUCH DAMAGE. 29 1.2.6.2 uebayasi */ 30 1.2.6.2 uebayasi 31 1.2.6.2 uebayasi #include <sys/cdefs.h> 32 1.2.6.2 uebayasi __KERNEL_RCSID(0, "$NetBSD: klock.c,v 1.2.6.2 2010/08/17 06:48:01 uebayasi Exp $"); 33 1.2.6.2 uebayasi 34 1.2.6.2 uebayasi #include <sys/param.h> 35 1.2.6.2 uebayasi #include <sys/systm.h> 36 1.2.6.2 uebayasi 37 1.2.6.2 uebayasi #include <rump/rumpuser.h> 38 1.2.6.2 uebayasi 39 1.2.6.2 uebayasi #include "rump_private.h" 40 1.2.6.2 uebayasi 41 1.2.6.2 uebayasi /* 42 1.2.6.2 uebayasi * giant lock 43 1.2.6.2 uebayasi */ 44 1.2.6.2 uebayasi 45 1.2.6.2 uebayasi static volatile int lockcnt; 46 1.2.6.2 uebayasi 47 1.2.6.2 uebayasi bool 48 1.2.6.2 uebayasi rump_kernel_isbiglocked() 49 1.2.6.2 uebayasi { 50 1.2.6.2 uebayasi 51 1.2.6.2 uebayasi return rumpuser_mutex_held(rump_giantlock) && lockcnt > 0; 52 1.2.6.2 uebayasi } 53 1.2.6.2 uebayasi 54 1.2.6.2 uebayasi void 55 1.2.6.2 uebayasi rump_kernel_unlock_allbutone(int *countp) 56 1.2.6.2 uebayasi { 57 1.2.6.2 uebayasi int minusone = lockcnt-1; 58 1.2.6.2 uebayasi 59 1.2.6.2 uebayasi KASSERT(rump_kernel_isbiglocked()); 60 1.2.6.2 uebayasi if (minusone) { 61 1.2.6.2 uebayasi _kernel_unlock(minusone, countp); 62 1.2.6.2 uebayasi } 63 1.2.6.2 uebayasi KASSERT(lockcnt == 1); 64 1.2.6.2 uebayasi *countp = minusone; 65 1.2.6.2 uebayasi 66 1.2.6.2 uebayasi /* 67 1.2.6.2 uebayasi * We drop lockcnt to 0 since rumpuser doesn't know that the 68 1.2.6.2 uebayasi * kernel biglock is being used as the interlock for cv in 69 1.2.6.2 uebayasi * tsleep. 70 1.2.6.2 uebayasi */ 71 1.2.6.2 uebayasi lockcnt = 0; 72 1.2.6.2 uebayasi } 73 1.2.6.2 uebayasi 74 1.2.6.2 uebayasi void 75 1.2.6.2 uebayasi rump_kernel_ununlock_allbutone(int nlocks) 76 1.2.6.2 uebayasi { 77 1.2.6.2 uebayasi 78 1.2.6.2 uebayasi KASSERT(rumpuser_mutex_held(rump_giantlock) && lockcnt == 0); 79 1.2.6.2 uebayasi lockcnt = 1; 80 1.2.6.2 uebayasi _kernel_lock(nlocks); 81 1.2.6.2 uebayasi } 82 1.2.6.2 uebayasi 83 1.2.6.2 uebayasi void 84 1.2.6.2 uebayasi _kernel_lock(int nlocks) 85 1.2.6.2 uebayasi { 86 1.2.6.2 uebayasi 87 1.2.6.2 uebayasi while (nlocks--) { 88 1.2.6.2 uebayasi if (!rumpuser_mutex_tryenter(rump_giantlock)) { 89 1.2.6.2 uebayasi struct lwp *l = curlwp; 90 1.2.6.2 uebayasi 91 1.2.6.2 uebayasi rump_unschedule_cpu1(l, NULL); 92 1.2.6.2 uebayasi rumpuser_mutex_enter_nowrap(rump_giantlock); 93 1.2.6.2 uebayasi rump_schedule_cpu(l); 94 1.2.6.2 uebayasi } 95 1.2.6.2 uebayasi lockcnt++; 96 1.2.6.2 uebayasi } 97 1.2.6.2 uebayasi } 98 1.2.6.2 uebayasi 99 1.2.6.2 uebayasi void 100 1.2.6.2 uebayasi _kernel_unlock(int nlocks, int *countp) 101 1.2.6.2 uebayasi { 102 1.2.6.2 uebayasi 103 1.2.6.2 uebayasi if (!rumpuser_mutex_held(rump_giantlock)) { 104 1.2.6.2 uebayasi KASSERT(nlocks == 0); 105 1.2.6.2 uebayasi if (countp) 106 1.2.6.2 uebayasi *countp = 0; 107 1.2.6.2 uebayasi return; 108 1.2.6.2 uebayasi } 109 1.2.6.2 uebayasi 110 1.2.6.2 uebayasi if (countp) 111 1.2.6.2 uebayasi *countp = lockcnt; 112 1.2.6.2 uebayasi if (nlocks == 0) 113 1.2.6.2 uebayasi nlocks = lockcnt; 114 1.2.6.2 uebayasi if (nlocks == -1) { 115 1.2.6.2 uebayasi KASSERT(lockcnt == 1); 116 1.2.6.2 uebayasi nlocks = 1; 117 1.2.6.2 uebayasi } 118 1.2.6.2 uebayasi KASSERT(nlocks <= lockcnt); 119 1.2.6.2 uebayasi while (nlocks--) { 120 1.2.6.2 uebayasi lockcnt--; 121 1.2.6.2 uebayasi rumpuser_mutex_exit(rump_giantlock); 122 1.2.6.2 uebayasi } 123 1.2.6.2 uebayasi } 124 1.2.6.2 uebayasi 125 1.2.6.2 uebayasi void 126 1.2.6.2 uebayasi rump_user_unschedule(int nlocks, int *countp, void *interlock) 127 1.2.6.2 uebayasi { 128 1.2.6.2 uebayasi 129 1.2.6.2 uebayasi _kernel_unlock(nlocks, countp); 130 1.2.6.2 uebayasi /* 131 1.2.6.2 uebayasi * XXX: technically we should unschedule_cpu1() here, but that 132 1.2.6.2 uebayasi * requires rump_intr_enter/exit to be implemented. 133 1.2.6.2 uebayasi */ 134 1.2.6.2 uebayasi rump_unschedule_cpu_interlock(curlwp, interlock); 135 1.2.6.2 uebayasi } 136 1.2.6.2 uebayasi 137 1.2.6.2 uebayasi void 138 1.2.6.2 uebayasi rump_user_schedule(int nlocks, void *interlock) 139 1.2.6.2 uebayasi { 140 1.2.6.2 uebayasi 141 1.2.6.2 uebayasi rump_schedule_cpu_interlock(curlwp, interlock); 142 1.2.6.2 uebayasi 143 1.2.6.2 uebayasi if (nlocks) 144 1.2.6.2 uebayasi _kernel_lock(nlocks); 145 1.2.6.2 uebayasi } 146
Indexes created Thu Oct 02 10:09:58 GMT 2025