From a417418db401d6d22c88906ee3b86c0d1057a31f Mon Sep 17 00:00:00 2001 From: jeff Date: Tue, 1 Apr 2003 00:30:30 +0000 Subject: - Add two files to support the thr threading interface. - sys/thr.h contains the user space visible api that is intended only for use in threading library packages. - kern/kern_thr.c contains thr system calls and other thr specific code. --- sys/kern/kern_thr.c | 259 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 259 insertions(+) create mode 100644 sys/kern/kern_thr.c (limited to 'sys/kern') diff --git a/sys/kern/kern_thr.c b/sys/kern/kern_thr.c new file mode 100644 index 0000000..6ee3b5c --- /dev/null +++ b/sys/kern/kern_thr.c @@ -0,0 +1,259 @@ +/* + * Copyright (c) 2003, Jeffrey Roberson + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice unmodified, this list of conditions, and the following + * disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * $FreeBSD$ + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +/* + * Back end support functions. + */ + +void +thr_exit1(void) +{ + struct ksegrp *kg; + struct thread *td; + struct kse *ke; + struct proc *p; + + td = curthread; + p = td->td_proc; + kg = td->td_ksegrp; + ke = td->td_kse; + + mtx_assert(&sched_lock, MA_OWNED); + PROC_LOCK_ASSERT(p, MA_OWNED); + KASSERT(!mtx_owned(&Giant), ("dying thread owns giant")); + + /* + * Shutting down last thread in the proc. This will actually + * call exit() in the trampoline when it returns. + */ + if (p->p_numthreads == 1) { + PROC_UNLOCK(p); + return; + } + + /* + * XXX Undelivered process wide signals should be reposted to the + * proc. + */ + + /* Clean up cpu resources. */ + cpu_thread_exit(td); + + /* XXX make thread_unlink() */ + TAILQ_REMOVE(&p->p_threads, td, td_plist); + p->p_numthreads--; + TAILQ_REMOVE(&kg->kg_threads, td, td_kglist); + kg->kg_numthreads--; + + ke->ke_state = KES_UNQUEUED; + ke->ke_thread = NULL; + kse_unlink(ke); + + /* + * If we were stopped while waiting for all threads to exit and this + * is the last thread wakeup the exiting thread. + */ + if (P_SHOULDSTOP(p) == P_STOPPED_SINGLE) + if (p->p_numthreads == 1) + thread_unsuspend_one(p->p_singlethread); + + PROC_UNLOCK(p); + td->td_kse = NULL; + td->td_state = TDS_INACTIVE; + td->td_proc = NULL; + td->td_ksegrp = NULL; + td->td_last_kse = NULL; + thread_stash(td); + + cpu_throw(); +} + +#define RANGEOF(type, start, end) (offsetof(type, end) - offsetof(type, start)) + +/* + * System call interface. + */ +int +thr_create(struct thread *td, struct thr_create_args *uap) + /* ucontext_t *ctx, thr_id_t *id, int flags */ +{ + struct kse *ke0; + struct thread *td0; + ucontext_t ctx; + int error; + + if ((error = copyin(uap->ctx, &ctx, sizeof(ctx)))) + return (error); + + /* Initialize our td. */ + td0 = thread_alloc(); + + /* + * Try the copyout as soon as we allocate the td so we don't have to + * tear things down in a failure case below. + */ + if ((error = copyout(&td0, uap->id, sizeof(thr_id_t)))) { + thread_free(td0); + return (error); + } + + bzero(&td0->td_startzero, + (unsigned)RANGEOF(struct thread, td_startzero, td_endzero)); + bcopy(&td->td_startcopy, &td0->td_startcopy, + (unsigned) RANGEOF(struct thread, td_startcopy, td_endcopy)); + + td0->td_proc = td->td_proc; + td0->td_sigmask = td->td_sigmask; + bcopy(td->td_frame, td0->td_frame, sizeof(struct trapframe)); + td0->td_ucred = crhold(td->td_ucred); + + /* Initialize our kse structure. */ + ke0 = kse_alloc(); + bzero(&ke0->ke_startzero, + RANGEOF(struct kse, ke_startzero, ke_endzero)); + + /* Set up our machine context. */ + cpu_set_upcall(td0, td->td_pcb); + error = set_mcontext(td0, &ctx.uc_mcontext); + if (error != 0) { + kse_free(ke0); + thread_free(td0); + goto out; + } + + /* Link the thread and kse into the ksegrp and make it runnable. */ + mtx_lock_spin(&sched_lock); + + thread_link(td0, td->td_ksegrp); + kse_link(ke0, td->td_ksegrp); + + /* Bind this thread and kse together. */ + td0->td_kse = ke0; + ke0->ke_thread = td0; + + TD_SET_CAN_RUN(td0); + if ((uap->flags & THR_SUSPENDED) == 0) + setrunqueue(td0); + + mtx_unlock_spin(&sched_lock); + +out: + return (error); +} + +int +thr_self(struct thread *td, struct thr_self_args *uap) + /* thr_id_t *id */ +{ + int error; + + if ((error = copyout(&td, uap->id, sizeof(thr_id_t)))) + return (error); + + return (0); +} + +int +thr_exit(struct thread *td, struct thr_exit_args *uap) + /* NULL */ +{ + struct proc *p; + + p = td->td_proc; + + PROC_LOCK(p); + mtx_lock_spin(&sched_lock); + + /* + * This unlocks proc and doesn't return unless this is the last + * thread. + */ + while (mtx_owned(&Giant)) + mtx_unlock(&Giant); + thr_exit1(); + mtx_unlock_spin(&sched_lock); + + return (0); +} + +int +thr_kill(struct thread *td, struct thr_kill_args *uap) + /* thr_id_t id, int sig */ +{ + struct thread *ttd; + struct proc *p; + int error; + + p = td->td_proc; + error = 0; + + PROC_LOCK(p); + + FOREACH_THREAD_IN_PROC(p, ttd) + if (ttd == uap->id) + break; + + if (ttd == NULL) { + error = ESRCH; + goto out; + } + + if (uap->sig == 0) + goto out; + + if (!_SIG_VALID(uap->sig)) { + error = EINVAL; + goto out; + } + + /* + * We need a way to force this to go into this thread's siglist. + * Until then blocked signals will go to the proc. + */ + tdsignal(ttd, uap->sig); +out: + PROC_UNLOCK(p); + + return (error); +} -- cgit v1.1