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 td->td_proc = NULL; 105 td->td_ksegrp = NULL; 106 td->td_last_kse = NULL; 107 thread_stash(td); 108 109 #if defined(__i386__) || defined(__sparc64__) 110 cpu_throw(td, choosethread()); 111 #else 112 cpu_throw(); 113 #endif 114 } 115 116 #define RANGEOF(type, start, end) (offsetof(type, end) - offsetof(type, start)) 117 118 /* 119 * System call interface. 120 */ 121 int 122 thr_create(struct thread *td, struct thr_create_args *uap) 123 /* ucontext_t *ctx, thr_id_t *id, int flags */ 124 { 125 struct kse *ke0; 126 struct thread *td0; 127 ucontext_t ctx; 128 int error; 129 130 if ((error = copyin(uap->ctx, &ctx, sizeof(ctx)))) 131 return (error); 132 133 /* Initialize our td. */ 134 td0 = thread_alloc(); 135 136 /* 137 * Try the copyout as soon as we allocate the td so we don't have to 138 * tear things down in a failure case below. 139 */ 140 if ((error = copyout(&td0, uap->id, sizeof(thr_id_t)))) { 141 thread_free(td0); 142 return (error); 143 } 144 145 bzero(&td0->td_startzero, 146 (unsigned)RANGEOF(struct thread, td_startzero, td_endzero)); 147 bcopy(&td->td_startcopy, &td0->td_startcopy, 148 (unsigned) RANGEOF(struct thread, td_startcopy, td_endcopy)); 149 150 td0->td_proc = td->td_proc; 151 td0->td_sigmask = td->td_sigmask; 152 bcopy(td->td_frame, td0->td_frame, sizeof(struct trapframe)); 153 td0->td_ucred = crhold(td->td_ucred); 154 155 /* Initialize our kse structure. */ 156 ke0 = kse_alloc(); 157 bzero(&ke0->ke_startzero, 158 RANGEOF(struct kse, ke_startzero, ke_endzero)); 159 160 /* Set up our machine context. */ 161 cpu_set_upcall(td0, td->td_pcb); 162 error = set_mcontext(td0, &ctx.uc_mcontext); 163 if (error != 0) { 164 kse_free(ke0); 165 thread_free(td0); 166 goto out; 167 } 168 169 /* Link the thread and kse into the ksegrp and make it runnable. */ 170 mtx_lock_spin(&sched_lock); 171 172 thread_link(td0, td->td_ksegrp); 173 kse_link(ke0, td->td_ksegrp); 174 175 /* Bind this thread and kse together. */ 176 td0->td_kse = ke0; 177 ke0->ke_thread = td0; 178 179 TD_SET_CAN_RUN(td0); 180 if ((uap->flags & THR_SUSPENDED) == 0) 181 setrunqueue(td0); 182 183 mtx_unlock_spin(&sched_lock); 184 185 out: 186 return (error); 187 } 188 189 int 190 thr_self(struct thread *td, struct thr_self_args *uap) 191 /* thr_id_t *id */ 192 { 193 int error; 194 195 if ((error = copyout(&td, uap->id, sizeof(thr_id_t)))) 196 return (error); 197 198 return (0); 199 } 200 201 int 202 thr_exit(struct thread *td, struct thr_exit_args *uap) 203 /* NULL */ 204 { 205 struct proc *p; 206 207 p = td->td_proc; 208 209 PROC_LOCK(p); 210 mtx_lock_spin(&sched_lock); 211 212 /* 213 * This unlocks proc and doesn't return unless this is the last 214 * thread. 215 */ 216 thr_exit1(); 217 mtx_unlock_spin(&sched_lock); 218 219 return (0); 220 } 221 222 int 223 thr_kill(struct thread *td, struct thr_kill_args *uap) 224 /* thr_id_t id, int sig */ 225 { 226 struct thread *ttd; 227 struct proc *p; 228 int error; 229 230 p = td->td_proc; 231 error = 0; 232 233 PROC_LOCK(p); 234 235 FOREACH_THREAD_IN_PROC(p, ttd) 236 if (ttd == uap->id) 237 break; 238 239 if (ttd == NULL) { 240 error = ESRCH; 241 goto out; 242 } 243 244 if (uap->sig == 0) 245 goto out; 246 247 if (!_SIG_VALID(uap->sig)) { 248 error = EINVAL; 249 goto out; 250 } 251 252 /* 253 * We need a way to force this to go into this thread's siglist. 254 * Until then blocked signals will go to the proc. 255 */ 256 tdsignal(ttd, uap->sig); 257 out: 258 PROC_UNLOCK(p); 259 260 return (error); 261 } 262