1 /* 2 * Copyright (c) 2003, Jeffrey Roberson <jeff@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 * 28 */ 29 30 #include <sys/param.h> 31 #include <sys/kernel.h> 32 #include <sys/lock.h> 33 #include <sys/mutex.h> 34 #include <sys/proc.h> 35 #include <sys/resourcevar.h> 36 #include <sys/sysent.h> 37 #include <sys/systm.h> 38 #include <sys/sysproto.h> 39 #include <sys/signalvar.h> 40 #include <sys/ucontext.h> 41 #include <sys/thr.h> 42 43 #include <machine/frame.h> 44 45 /* 46 * Back end support functions. 47 */ 48 49 void 50 thr_exit1(void) 51 { 52 struct ksegrp *kg; 53 struct thread *td; 54 struct kse *ke; 55 struct proc *p; 56 57 td = curthread; 58 p = td->td_proc; 59 kg = td->td_ksegrp; 60 ke = td->td_kse; 61 62 mtx_assert(&sched_lock, MA_OWNED); 63 PROC_LOCK_ASSERT(p, MA_OWNED); 64 KASSERT(!mtx_owned(&Giant), ("dying thread owns giant")); 65 66 /* 67 * Shutting down last thread in the proc. This will actually 68 * call exit() in the trampoline when it returns. 69 */ 70 if (p->p_numthreads == 1) { 71 PROC_UNLOCK(p); 72 return; 73 } 74 75 /* 76 * XXX Undelivered process wide signals should be reposted to the 77 * proc. 78 */ 79 80 /* Clean up cpu resources. */ 81 cpu_thread_exit(td); 82 83 /* XXX make thread_unlink() */ 84 TAILQ_REMOVE(&p->p_threads, td, td_plist); 85 p->p_numthreads--; 86 TAILQ_REMOVE(&kg->kg_threads, td, td_kglist); 87 kg->kg_numthreads--; 88 89 ke->ke_state = KES_UNQUEUED; 90 ke->ke_thread = NULL; 91 kse_unlink(ke); 92 93 /* 94 * If we were stopped while waiting for all threads to exit and this 95 * is the last thread wakeup the exiting thread. 96 */ 97 if (P_SHOULDSTOP(p) == P_STOPPED_SINGLE) 98 if (p->p_numthreads == 1) 99 thread_unsuspend_one(p->p_singlethread); 100 101 PROC_UNLOCK(p); 102 td->td_kse = NULL; 103 td->td_state = TDS_INACTIVE; 104 #if 0 105 td->td_proc = NULL; 106 #endif 107 td->td_ksegrp = NULL; 108 td->td_last_kse = NULL; 109 thread_stash(td); 110 111 #if defined(__i386__) || defined(__sparc64__) 112 cpu_throw(td, choosethread()); 113 #else 114 cpu_throw(); 115 #endif 116 } 117 118 #define RANGEOF(type, start, end) (offsetof(type, end) - offsetof(type, start)) 119 120 /* 121 * System call interface. 122 */ 123 int 124 thr_create(struct thread *td, struct thr_create_args *uap) 125 /* ucontext_t *ctx, thr_id_t *id, int flags */ 126 { 127 struct kse *ke0; 128 struct thread *td0; 129 ucontext_t ctx; 130 int error; 131 132 if ((error = copyin(uap->ctx, &ctx, sizeof(ctx)))) 133 return (error); 134 135 /* Initialize our td. */ 136 td0 = thread_alloc(); 137 138 /* 139 * Try the copyout as soon as we allocate the td so we don't have to 140 * tear things down in a failure case below. 141 */ 142 if ((error = copyout(&td0, uap->id, sizeof(thr_id_t)))) { 143 thread_free(td0); 144 return (error); 145 } 146 147 bzero(&td0->td_startzero, 148 (unsigned)RANGEOF(struct thread, td_startzero, td_endzero)); 149 bcopy(&td->td_startcopy, &td0->td_startcopy, 150 (unsigned) RANGEOF(struct thread, td_startcopy, td_endcopy)); 151 152 td0->td_proc = td->td_proc; 153 td0->td_sigmask = td->td_sigmask; 154 bcopy(td->td_frame, td0->td_frame, sizeof(struct trapframe)); 155 td0->td_ucred = crhold(td->td_ucred); 156 157 /* Initialize our kse structure. */ 158 ke0 = kse_alloc(); 159 bzero(&ke0->ke_startzero, 160 RANGEOF(struct kse, ke_startzero, ke_endzero)); 161 162 /* Set up our machine context. */ 163 cpu_set_upcall(td0, td->td_pcb); 164 error = set_mcontext(td0, &ctx.uc_mcontext); 165 if (error != 0) { 166 kse_free(ke0); 167 thread_free(td0); 168 goto out; 169 } 170 171 /* Link the thread and kse into the ksegrp and make it runnable. */ 172 mtx_lock_spin(&sched_lock); 173 174 thread_link(td0, td->td_ksegrp); 175 kse_link(ke0, td->td_ksegrp); 176 177 /* Bind this thread and kse together. */ 178 td0->td_kse = ke0; 179 ke0->ke_thread = td0; 180 181 TD_SET_CAN_RUN(td0); 182 if ((uap->flags & THR_SUSPENDED) == 0) 183 setrunqueue(td0); 184 185 mtx_unlock_spin(&sched_lock); 186 187 out: 188 return (error); 189 } 190 191 int 192 thr_self(struct thread *td, struct thr_self_args *uap) 193 /* thr_id_t *id */ 194 { 195 int error; 196 197 if ((error = copyout(&td, uap->id, sizeof(thr_id_t)))) 198 return (error); 199 200 return (0); 201 } 202 203 int 204 thr_exit(struct thread *td, struct thr_exit_args *uap) 205 /* NULL */ 206 { 207 struct proc *p; 208 209 p = td->td_proc; 210 211 PROC_LOCK(p); 212 mtx_lock_spin(&sched_lock); 213 214 /* 215 * This unlocks proc and doesn't return unless this is the last 216 * thread. 217 */ 218 thr_exit1(); 219 mtx_unlock_spin(&sched_lock); 220 221 return (0); 222 } 223 224 int 225 thr_kill(struct thread *td, struct thr_kill_args *uap) 226 /* thr_id_t id, int sig */ 227 { 228 struct thread *ttd; 229 struct proc *p; 230 int error; 231 232 p = td->td_proc; 233 error = 0; 234 235 PROC_LOCK(p); 236 237 FOREACH_THREAD_IN_PROC(p, ttd) 238 if (ttd == uap->id) 239 break; 240 241 if (ttd == NULL) { 242 error = ESRCH; 243 goto out; 244 } 245 246 if (uap->sig == 0) 247 goto out; 248 249 if (!_SIG_VALID(uap->sig)) { 250 error = EINVAL; 251 goto out; 252 } 253 254 /* 255 * We need a way to force this to go into this thread's siglist. 256 * Until then blocked signals will go to the proc. 257 */ 258 tdsignal(ttd, uap->sig); 259 out: 260 PROC_UNLOCK(p); 261 262 return (error); 263 } 264