klock.c revision 1.2.2.2
1 1.2.2.2 rmind /* $NetBSD: klock.c,v 1.2.2.2 2010/05/30 05:18:06 rmind Exp $ */ 2 1.2.2.2 rmind 3 1.2.2.2 rmind /* 4 1.2.2.2 rmind * Copyright (c) 2007-2010 Antti Kantee. All Rights Reserved. 5 1.2.2.2 rmind * 6 1.2.2.2 rmind * Development of this software was supported by the 7 1.2.2.2 rmind * Finnish Cultural Foundation. 8 1.2.2.2 rmind * 9 1.2.2.2 rmind * Redistribution and use in source and binary forms, with or without 10 1.2.2.2 rmind * modification, are permitted provided that the following conditions 11 1.2.2.2 rmind * are met: 12 1.2.2.2 rmind * 1. Redistributions of source code must retain the above copyright 13 1.2.2.2 rmind * notice, this list of conditions and the following disclaimer. 14 1.2.2.2 rmind * 2. Redistributions in binary form must reproduce the above copyright 15 1.2.2.2 rmind * notice, this list of conditions and the following disclaimer in the 16 1.2.2.2 rmind * documentation and/or other materials provided with the distribution. 17 1.2.2.2 rmind * 18 1.2.2.2 rmind * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 19 1.2.2.2 rmind * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 20 1.2.2.2 rmind * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 21 1.2.2.2 rmind * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 1.2.2.2 rmind * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 1.2.2.2 rmind * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 24 1.2.2.2 rmind * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 1.2.2.2 rmind * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 1.2.2.2 rmind * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 1.2.2.2 rmind * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 1.2.2.2 rmind * SUCH DAMAGE. 29 1.2.2.2 rmind */ 30 1.2.2.2 rmind 31 1.2.2.2 rmind #include <sys/cdefs.h> 32 1.2.2.2 rmind __KERNEL_RCSID(0, "$NetBSD: klock.c,v 1.2.2.2 2010/05/30 05:18:06 rmind Exp $"); 33 1.2.2.2 rmind 34 1.2.2.2 rmind #include <sys/param.h> 35 1.2.2.2 rmind #include <sys/systm.h> 36 1.2.2.2 rmind 37 1.2.2.2 rmind #include <rump/rumpuser.h> 38 1.2.2.2 rmind 39 1.2.2.2 rmind #include "rump_private.h" 40 1.2.2.2 rmind 41 1.2.2.2 rmind /* 42 1.2.2.2 rmind * giant lock 43 1.2.2.2 rmind */ 44 1.2.2.2 rmind 45 1.2.2.2 rmind static volatile int lockcnt; 46 1.2.2.2 rmind 47 1.2.2.2 rmind bool 48 1.2.2.2 rmind rump_kernel_isbiglocked() 49 1.2.2.2 rmind { 50 1.2.2.2 rmind 51 1.2.2.2 rmind return rumpuser_mutex_held(rump_giantlock) && lockcnt > 0; 52 1.2.2.2 rmind } 53 1.2.2.2 rmind 54 1.2.2.2 rmind void 55 1.2.2.2 rmind rump_kernel_unlock_allbutone(int *countp) 56 1.2.2.2 rmind { 57 1.2.2.2 rmind int minusone = lockcnt-1; 58 1.2.2.2 rmind 59 1.2.2.2 rmind KASSERT(rump_kernel_isbiglocked()); 60 1.2.2.2 rmind if (minusone) { 61 1.2.2.2 rmind _kernel_unlock(minusone, countp); 62 1.2.2.2 rmind } 63 1.2.2.2 rmind KASSERT(lockcnt == 1); 64 1.2.2.2 rmind *countp = minusone; 65 1.2.2.2 rmind 66 1.2.2.2 rmind /* 67 1.2.2.2 rmind * We drop lockcnt to 0 since rumpuser doesn't know that the 68 1.2.2.2 rmind * kernel biglock is being used as the interlock for cv in 69 1.2.2.2 rmind * tsleep. 70 1.2.2.2 rmind */ 71 1.2.2.2 rmind lockcnt = 0; 72 1.2.2.2 rmind } 73 1.2.2.2 rmind 74 1.2.2.2 rmind void 75 1.2.2.2 rmind rump_kernel_ununlock_allbutone(int nlocks) 76 1.2.2.2 rmind { 77 1.2.2.2 rmind 78 1.2.2.2 rmind KASSERT(rumpuser_mutex_held(rump_giantlock) && lockcnt == 0); 79 1.2.2.2 rmind lockcnt = 1; 80 1.2.2.2 rmind _kernel_lock(nlocks); 81 1.2.2.2 rmind } 82 1.2.2.2 rmind 83 1.2.2.2 rmind void 84 1.2.2.2 rmind _kernel_lock(int nlocks) 85 1.2.2.2 rmind { 86 1.2.2.2 rmind 87 1.2.2.2 rmind while (nlocks--) { 88 1.2.2.2 rmind if (!rumpuser_mutex_tryenter(rump_giantlock)) { 89 1.2.2.2 rmind struct lwp *l = curlwp; 90 1.2.2.2 rmind 91 1.2.2.2 rmind rump_unschedule_cpu1(l, NULL); 92 1.2.2.2 rmind rumpuser_mutex_enter_nowrap(rump_giantlock); 93 1.2.2.2 rmind rump_schedule_cpu(l); 94 1.2.2.2 rmind } 95 1.2.2.2 rmind lockcnt++; 96 1.2.2.2 rmind } 97 1.2.2.2 rmind } 98 1.2.2.2 rmind 99 1.2.2.2 rmind void 100 1.2.2.2 rmind _kernel_unlock(int nlocks, int *countp) 101 1.2.2.2 rmind { 102 1.2.2.2 rmind 103 1.2.2.2 rmind if (!rumpuser_mutex_held(rump_giantlock)) { 104 1.2.2.2 rmind KASSERT(nlocks == 0); 105 1.2.2.2 rmind if (countp) 106 1.2.2.2 rmind *countp = 0; 107 1.2.2.2 rmind return; 108 1.2.2.2 rmind } 109 1.2.2.2 rmind 110 1.2.2.2 rmind if (countp) 111 1.2.2.2 rmind *countp = lockcnt; 112 1.2.2.2 rmind if (nlocks == 0) 113 1.2.2.2 rmind nlocks = lockcnt; 114 1.2.2.2 rmind if (nlocks == -1) { 115 1.2.2.2 rmind KASSERT(lockcnt == 1); 116 1.2.2.2 rmind nlocks = 1; 117 1.2.2.2 rmind } 118 1.2.2.2 rmind KASSERT(nlocks <= lockcnt); 119 1.2.2.2 rmind while (nlocks--) { 120 1.2.2.2 rmind lockcnt--; 121 1.2.2.2 rmind rumpuser_mutex_exit(rump_giantlock); 122 1.2.2.2 rmind } 123 1.2.2.2 rmind } 124 1.2.2.2 rmind 125 1.2.2.2 rmind void 126 1.2.2.2 rmind rump_user_unschedule(int nlocks, int *countp, void *interlock) 127 1.2.2.2 rmind { 128 1.2.2.2 rmind 129 1.2.2.2 rmind _kernel_unlock(nlocks, countp); 130 1.2.2.2 rmind /* 131 1.2.2.2 rmind * XXX: technically we should unschedule_cpu1() here, but that 132 1.2.2.2 rmind * requires rump_intr_enter/exit to be implemented. 133 1.2.2.2 rmind */ 134 1.2.2.2 rmind rump_unschedule_cpu_interlock(curlwp, interlock); 135 1.2.2.2 rmind } 136 1.2.2.2 rmind 137 1.2.2.2 rmind void 138 1.2.2.2 rmind rump_user_schedule(int nlocks, void *interlock) 139 1.2.2.2 rmind { 140 1.2.2.2 rmind 141 1.2.2.2 rmind rump_schedule_cpu_interlock(curlwp, interlock); 142 1.2.2.2 rmind 143 1.2.2.2 rmind if (nlocks) 144 1.2.2.2 rmind _kernel_lock(nlocks); 145 1.2.2.2 rmind } 146
Indexes created Thu Oct 02 10:09:58 GMT 2025