kern_kthread.c revision 1.15.18.4
1 1.15.18.4 yamt /* $NetBSD: kern_kthread.c,v 1.15.18.4 2008/01/21 09:46:05 yamt Exp $ */ 2 1.1 thorpej 3 1.1 thorpej /*- 4 1.15.18.2 yamt * Copyright (c) 1998, 1999, 2007 The NetBSD Foundation, Inc. 5 1.1 thorpej * All rights reserved. 6 1.1 thorpej * 7 1.1 thorpej * This code is derived from software contributed to The NetBSD Foundation 8 1.1 thorpej * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 1.15.18.2 yamt * NASA Ames Research Center, and by Andrew Doran. 10 1.1 thorpej * 11 1.1 thorpej * Redistribution and use in source and binary forms, with or without 12 1.1 thorpej * modification, are permitted provided that the following conditions 13 1.1 thorpej * are met: 14 1.1 thorpej * 1. Redistributions of source code must retain the above copyright 15 1.1 thorpej * notice, this list of conditions and the following disclaimer. 16 1.1 thorpej * 2. Redistributions in binary form must reproduce the above copyright 17 1.1 thorpej * notice, this list of conditions and the following disclaimer in the 18 1.1 thorpej * documentation and/or other materials provided with the distribution. 19 1.1 thorpej * 3. All advertising materials mentioning features or use of this software 20 1.1 thorpej * must display the following acknowledgement: 21 1.1 thorpej * This product includes software developed by the NetBSD 22 1.1 thorpej * Foundation, Inc. and its contributors. 23 1.1 thorpej * 4. Neither the name of The NetBSD Foundation nor the names of its 24 1.1 thorpej * contributors may be used to endorse or promote products derived 25 1.1 thorpej * from this software without specific prior written permission. 26 1.1 thorpej * 27 1.1 thorpej * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 1.1 thorpej * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 1.1 thorpej * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 1.1 thorpej * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 1.1 thorpej * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 1.1 thorpej * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 1.1 thorpej * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 1.1 thorpej * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 1.1 thorpej * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 1.1 thorpej * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 1.1 thorpej * POSSIBILITY OF SUCH DAMAGE. 38 1.1 thorpej */ 39 1.12 lukem 40 1.12 lukem #include <sys/cdefs.h> 41 1.15.18.4 yamt __KERNEL_RCSID(0, "$NetBSD: kern_kthread.c,v 1.15.18.4 2008/01/21 09:46:05 yamt Exp $"); 42 1.1 thorpej 43 1.1 thorpej #include <sys/param.h> 44 1.1 thorpej #include <sys/systm.h> 45 1.1 thorpej #include <sys/kernel.h> 46 1.1 thorpej #include <sys/kthread.h> 47 1.1 thorpej #include <sys/proc.h> 48 1.15.18.2 yamt #include <sys/sched.h> 49 1.15.18.2 yamt #include <sys/kmem.h> 50 1.15.18.2 yamt 51 1.15.18.2 yamt #include <uvm/uvm_extern.h> 52 1.1 thorpej 53 1.1 thorpej /* 54 1.1 thorpej * note that stdarg.h and the ansi style va_start macro is used for both 55 1.1 thorpej * ansi and traditional c complers. 56 1.1 thorpej * XXX: this requires that stdarg.h define: va_alist and va_dcl 57 1.1 thorpej */ 58 1.1 thorpej #include <machine/stdarg.h> 59 1.1 thorpej 60 1.1 thorpej /* 61 1.1 thorpej * Fork a kernel thread. Any process can request this to be done. 62 1.1 thorpej */ 63 1.1 thorpej int 64 1.15.18.2 yamt kthread_create(pri_t pri, int flag, struct cpu_info *ci, 65 1.15.18.2 yamt void (*func)(void *), void *arg, 66 1.15.18.2 yamt lwp_t **lp, const char *fmt, ...) 67 1.1 thorpej { 68 1.15.18.2 yamt lwp_t *l; 69 1.15.18.2 yamt vaddr_t uaddr; 70 1.15.18.2 yamt bool inmem; 71 1.1 thorpej int error; 72 1.1 thorpej va_list ap; 73 1.1 thorpej 74 1.15.18.2 yamt inmem = uvm_uarea_alloc(&uaddr); 75 1.15.18.2 yamt if (uaddr == 0) 76 1.15.18.2 yamt return ENOMEM; 77 1.15.18.3 yamt error = lwp_create(&lwp0, &proc0, uaddr, inmem, LWP_DETACHED, NULL, 78 1.15.18.3 yamt 0, func, arg, &l, SCHED_FIFO); 79 1.15.18.2 yamt if (error) { 80 1.15.18.3 yamt uvm_uarea_free(uaddr, curcpu()); 81 1.15.18.2 yamt return error; 82 1.15.18.2 yamt } 83 1.15.18.2 yamt uvm_lwp_hold(l); 84 1.15.18.2 yamt if (fmt != NULL) { 85 1.15.18.2 yamt l->l_name = kmem_alloc(MAXCOMLEN, KM_SLEEP); 86 1.15.18.2 yamt if (l->l_name == NULL) { 87 1.15.18.2 yamt lwp_exit(l); 88 1.15.18.2 yamt return ENOMEM; 89 1.15.18.2 yamt } 90 1.15.18.2 yamt va_start(ap, fmt); 91 1.15.18.2 yamt vsnprintf(l->l_name, MAXCOMLEN, fmt, ap); 92 1.15.18.2 yamt va_end(ap); 93 1.15.18.2 yamt } 94 1.15.18.2 yamt 95 1.15.18.2 yamt /* 96 1.15.18.2 yamt * Set parameters. 97 1.15.18.2 yamt */ 98 1.15.18.2 yamt if ((flag & KTHREAD_INTR) != 0) { 99 1.15.18.2 yamt KASSERT((flag & KTHREAD_MPSAFE) != 0); 100 1.15.18.2 yamt } 101 1.15.18.2 yamt 102 1.15.18.2 yamt if (pri == PRI_NONE) { 103 1.15.18.2 yamt /* Minimum kernel priority level. */ 104 1.15.18.3 yamt pri = PRI_KTHREAD; 105 1.15.18.2 yamt } 106 1.15.18.3 yamt mutex_enter(&proc0.p_smutex); 107 1.15.18.3 yamt lwp_lock(l); 108 1.15.18.2 yamt l->l_priority = pri; 109 1.15.18.2 yamt if (ci != NULL) { 110 1.15.18.2 yamt if (ci != l->l_cpu) { 111 1.15.18.2 yamt lwp_unlock_to(l, ci->ci_schedstate.spc_mutex); 112 1.15.18.2 yamt lwp_lock(l); 113 1.15.18.2 yamt } 114 1.15.18.2 yamt l->l_flag |= LW_BOUND; 115 1.15.18.2 yamt l->l_cpu = ci; 116 1.15.18.2 yamt } 117 1.15.18.2 yamt if ((flag & KTHREAD_INTR) != 0) 118 1.15.18.3 yamt l->l_pflag |= LP_INTR; 119 1.15.18.4 yamt if ((flag & KTHREAD_MPSAFE) == 0) 120 1.15.18.4 yamt l->l_pflag &= ~LP_MPSAFE; 121 1.15.18.2 yamt 122 1.15.18.2 yamt /* 123 1.15.18.2 yamt * Set the new LWP running, unless the caller has requested 124 1.15.18.2 yamt * otherwise. 125 1.15.18.2 yamt */ 126 1.15.18.2 yamt if ((flag & KTHREAD_IDLE) == 0) { 127 1.15.18.2 yamt l->l_stat = LSRUN; 128 1.15.18.2 yamt sched_enqueue(l, false); 129 1.15.18.3 yamt lwp_unlock(l); 130 1.15.18.3 yamt } else 131 1.15.18.3 yamt lwp_unlock_to(l, &ci->ci_schedstate.spc_lwplock); 132 1.15.18.2 yamt 133 1.15.18.2 yamt /* 134 1.15.18.2 yamt * The LWP is not created suspended or stopped and cannot be set 135 1.15.18.2 yamt * into those states later, so must be considered runnable. 136 1.15.18.2 yamt */ 137 1.15.18.2 yamt proc0.p_nrlwps++; 138 1.15.18.2 yamt mutex_exit(&proc0.p_smutex); 139 1.1 thorpej 140 1.1 thorpej /* All done! */ 141 1.15.18.2 yamt if (lp != NULL) 142 1.15.18.2 yamt *lp = l; 143 1.15.18.2 yamt 144 1.1 thorpej return (0); 145 1.1 thorpej } 146 1.1 thorpej 147 1.1 thorpej /* 148 1.1 thorpej * Cause a kernel thread to exit. Assumes the exiting thread is the 149 1.1 thorpej * current context. 150 1.1 thorpej */ 151 1.1 thorpej void 152 1.11 thorpej kthread_exit(int ecode) 153 1.1 thorpej { 154 1.15.18.2 yamt const char *name; 155 1.15.18.2 yamt lwp_t *l = curlwp; 156 1.1 thorpej 157 1.15.18.2 yamt /* We can't do much with the exit code, so just report it. */ 158 1.15.18.2 yamt if (ecode != 0) { 159 1.15.18.2 yamt if ((name = l->l_name) == NULL) 160 1.15.18.2 yamt name = "unnamed"; 161 1.15.18.2 yamt printf("WARNING: kthread `%s' (%d) exits with status %d\n", 162 1.15.18.2 yamt name, l->l_lid, ecode); 163 1.15.18.2 yamt } 164 1.15.18.2 yamt 165 1.15.18.2 yamt /* And exit.. */ 166 1.15.18.2 yamt lwp_exit(l); 167 1.1 thorpej 168 1.1 thorpej /* 169 1.1 thorpej * XXX Fool the compiler. Making exit1() __noreturn__ is a can 170 1.1 thorpej * XXX of worms right now. 171 1.1 thorpej */ 172 1.15.18.2 yamt for (;;) 173 1.15.18.2 yamt ; 174 1.2 thorpej } 175 1.2 thorpej 176 1.2 thorpej /* 177 1.15.18.2 yamt * Destroy an inactive kthread. The kthread must be in the LSIDL state. 178 1.2 thorpej */ 179 1.2 thorpej void 180 1.15.18.2 yamt kthread_destroy(lwp_t *l) 181 1.2 thorpej { 182 1.8 thorpej 183 1.15.18.2 yamt KASSERT((l->l_flag & LW_SYSTEM) != 0); 184 1.15.18.2 yamt KASSERT(l->l_stat == LSIDL); 185 1.2 thorpej 186 1.15.18.2 yamt lwp_exit(l); 187 1.1 thorpej } 188
Indexes created Tue Sep 30 11:09:46 GMT 2025