1 /* $NetBSD: threads.c,v 1.8 2010/02/09 16:53:13 pooka Exp $ */ 2 3 /* 4 * Copyright (c) 2007-2009 Antti Kantee. All Rights Reserved. 5 * 6 * Development of this software was supported by 7 * The Finnish Cultural Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 19 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: threads.c,v 1.8 2010/02/09 16:53:13 pooka Exp $"); 33 34 #include <sys/param.h> 35 #include <sys/kmem.h> 36 #include <sys/kthread.h> 37 #include <sys/systm.h> 38 39 #include <machine/stdarg.h> 40 41 #include <rump/rumpuser.h> 42 43 #include "rump_private.h" 44 45 struct kthdesc { 46 void (*f)(void *); 47 void *arg; 48 struct lwp *mylwp; 49 }; 50 51 static void * 52 threadbouncer(void *arg) 53 { 54 struct kthdesc *k = arg; 55 struct lwp *l = k->mylwp; 56 void (*f)(void *); 57 void *thrarg; 58 59 f = k->f; 60 thrarg = k->arg; 61 rumpuser_free(k); 62 63 /* schedule ourselves */ 64 rumpuser_set_curlwp(l); 65 rump_schedule(); 66 67 if ((curlwp->l_pflag & LP_MPSAFE) == 0) 68 KERNEL_LOCK(1, NULL); 69 70 f(thrarg); 71 72 panic("unreachable, should kthread_exit()"); 73 } 74 75 int 76 kthread_create(pri_t pri, int flags, struct cpu_info *ci, 77 void (*func)(void *), void *arg, lwp_t **newlp, const char *fmt, ...) 78 { 79 char thrstore[MAXCOMLEN]; 80 const char *thrname = NULL; 81 va_list ap; 82 struct kthdesc *k; 83 struct lwp *l; 84 int rv; 85 86 thrstore[0] = '\0'; 87 if (fmt) { 88 va_start(ap, fmt); 89 vsnprintf(thrstore, sizeof(thrstore), fmt, ap); 90 va_end(ap); 91 thrname = thrstore; 92 } 93 94 /* 95 * We don't want a module unload thread. 96 * (XXX: yes, this is a kludge too, and the kernel should 97 * have a more flexible method for configuring which threads 98 * we want). 99 */ 100 if (strcmp(thrstore, "modunload") == 0) { 101 return 0; 102 } 103 104 if (!rump_threads) { 105 /* fake them */ 106 if (strcmp(thrstore, "vrele") == 0) { 107 printf("rump warning: threads not enabled, not starting" 108 " vrele thread\n"); 109 return 0; 110 } else if (strcmp(thrstore, "cachegc") == 0) { 111 printf("rump warning: threads not enabled, not starting" 112 " namecache g/c thread\n"); 113 return 0; 114 } else if (strcmp(thrstore, "nfssilly") == 0) { 115 printf("rump warning: threads not enabled, not enabling" 116 " nfs silly rename\n"); 117 return 0; 118 } else if (strcmp(thrstore, "unpgc") == 0) { 119 printf("rump warning: threads not enabled, not enabling" 120 " UNP garbage collection\n"); 121 return 0; 122 } else if (strncmp(thrstore, "pmf", sizeof("pmf")-1) == 0) { 123 printf("rump warning: threads not enabled, not enabling" 124 " pmf thread\n"); 125 return 0; 126 } else if (strncmp(thrstore, "xcall", sizeof("xcall")-1) == 0) { 127 printf("rump warning: threads not enabled, CPU xcall" 128 " not functional\n"); 129 return 0; 130 } else 131 panic("threads not available, setenv RUMP_THREADS 1"); 132 } 133 KASSERT(fmt != NULL); 134 135 k = rumpuser_malloc(sizeof(struct kthdesc), 0); 136 k->f = func; 137 k->arg = arg; 138 k->mylwp = l = rump_lwp_alloc(0, rump_nextlid()); 139 if (flags & KTHREAD_MPSAFE) 140 l->l_pflag |= LP_MPSAFE; 141 if (flags & KTHREAD_INTR) 142 l->l_pflag |= LP_INTR; 143 if (ci) { 144 l->l_pflag |= LP_BOUND; 145 l->l_cpu = ci; 146 } 147 if (thrname) { 148 l->l_name = kmem_alloc(MAXCOMLEN, KM_SLEEP); 149 strlcpy(l->l_name, thrname, MAXCOMLEN); 150 } 151 152 rv = rumpuser_thread_create(threadbouncer, k, thrname); 153 if (rv) 154 return rv; 155 156 if (newlp) 157 *newlp = l; 158 return 0; 159 } 160 161 void 162 kthread_exit(int ecode) 163 { 164 165 if ((curlwp->l_pflag & LP_MPSAFE) == 0) 166 KERNEL_UNLOCK_LAST(NULL); 167 rump_lwp_release(curlwp); 168 rump_unschedule(); 169 rumpuser_thread_exit(); 170 } 171