- 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.
This commit is contained in:
Jeff Roberson
parent
b8db34d280
commit
89bb1cef1d
259
sys/kern/kern_thr.c
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259
sys/kern/kern_thr.c
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/*
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* Copyright (c) 2003, Jeffrey Roberson <jeff@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/resourcevar.h>
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#include <sys/sysent.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/signalvar.h>
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#include <sys/ucontext.h>
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#include <sys/thr.h>
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#include <machine/frame.h>
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/*
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* Back end support functions.
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*/
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void
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thr_exit1(void)
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{
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struct ksegrp *kg;
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struct thread *td;
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struct kse *ke;
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struct proc *p;
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td = curthread;
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p = td->td_proc;
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kg = td->td_ksegrp;
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ke = td->td_kse;
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mtx_assert(&sched_lock, MA_OWNED);
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PROC_LOCK_ASSERT(p, MA_OWNED);
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KASSERT(!mtx_owned(&Giant), ("dying thread owns giant"));
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/*
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* Shutting down last thread in the proc. This will actually
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* call exit() in the trampoline when it returns.
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*/
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if (p->p_numthreads == 1) {
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PROC_UNLOCK(p);
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return;
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}
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/*
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* XXX Undelivered process wide signals should be reposted to the
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* proc.
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*/
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/* Clean up cpu resources. */
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cpu_thread_exit(td);
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/* XXX make thread_unlink() */
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TAILQ_REMOVE(&p->p_threads, td, td_plist);
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p->p_numthreads--;
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TAILQ_REMOVE(&kg->kg_threads, td, td_kglist);
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kg->kg_numthreads--;
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ke->ke_state = KES_UNQUEUED;
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ke->ke_thread = NULL;
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kse_unlink(ke);
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/*
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* If we were stopped while waiting for all threads to exit and this
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* is the last thread wakeup the exiting thread.
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*/
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if (P_SHOULDSTOP(p) == P_STOPPED_SINGLE)
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if (p->p_numthreads == 1)
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thread_unsuspend_one(p->p_singlethread);
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PROC_UNLOCK(p);
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td->td_kse = NULL;
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td->td_state = TDS_INACTIVE;
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td->td_proc = NULL;
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td->td_ksegrp = NULL;
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td->td_last_kse = NULL;
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thread_stash(td);
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cpu_throw();
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}
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#define RANGEOF(type, start, end) (offsetof(type, end) - offsetof(type, start))
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/*
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* System call interface.
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*/
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int
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thr_create(struct thread *td, struct thr_create_args *uap)
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/* ucontext_t *ctx, thr_id_t *id, int flags */
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{
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struct kse *ke0;
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struct thread *td0;
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ucontext_t ctx;
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int error;
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if ((error = copyin(uap->ctx, &ctx, sizeof(ctx))))
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return (error);
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/* Initialize our td. */
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td0 = thread_alloc();
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/*
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* Try the copyout as soon as we allocate the td so we don't have to
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* tear things down in a failure case below.
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*/
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if ((error = copyout(&td0, uap->id, sizeof(thr_id_t)))) {
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thread_free(td0);
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return (error);
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}
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bzero(&td0->td_startzero,
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(unsigned)RANGEOF(struct thread, td_startzero, td_endzero));
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bcopy(&td->td_startcopy, &td0->td_startcopy,
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(unsigned) RANGEOF(struct thread, td_startcopy, td_endcopy));
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td0->td_proc = td->td_proc;
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td0->td_sigmask = td->td_sigmask;
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bcopy(td->td_frame, td0->td_frame, sizeof(struct trapframe));
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td0->td_ucred = crhold(td->td_ucred);
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/* Initialize our kse structure. */
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ke0 = kse_alloc();
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bzero(&ke0->ke_startzero,
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RANGEOF(struct kse, ke_startzero, ke_endzero));
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/* Set up our machine context. */
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cpu_set_upcall(td0, td->td_pcb);
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error = set_mcontext(td0, &ctx.uc_mcontext);
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if (error != 0) {
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kse_free(ke0);
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thread_free(td0);
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goto out;
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}
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/* Link the thread and kse into the ksegrp and make it runnable. */
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mtx_lock_spin(&sched_lock);
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thread_link(td0, td->td_ksegrp);
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kse_link(ke0, td->td_ksegrp);
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/* Bind this thread and kse together. */
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td0->td_kse = ke0;
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ke0->ke_thread = td0;
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TD_SET_CAN_RUN(td0);
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if ((uap->flags & THR_SUSPENDED) == 0)
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setrunqueue(td0);
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mtx_unlock_spin(&sched_lock);
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out:
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return (error);
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}
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int
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thr_self(struct thread *td, struct thr_self_args *uap)
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/* thr_id_t *id */
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{
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int error;
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if ((error = copyout(&td, uap->id, sizeof(thr_id_t))))
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return (error);
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return (0);
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}
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int
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thr_exit(struct thread *td, struct thr_exit_args *uap)
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/* NULL */
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{
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struct proc *p;
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p = td->td_proc;
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PROC_LOCK(p);
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mtx_lock_spin(&sched_lock);
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/*
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* This unlocks proc and doesn't return unless this is the last
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* thread.
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*/
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while (mtx_owned(&Giant))
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mtx_unlock(&Giant);
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thr_exit1();
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mtx_unlock_spin(&sched_lock);
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return (0);
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}
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int
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thr_kill(struct thread *td, struct thr_kill_args *uap)
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/* thr_id_t id, int sig */
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{
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struct thread *ttd;
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struct proc *p;
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int error;
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p = td->td_proc;
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error = 0;
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PROC_LOCK(p);
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FOREACH_THREAD_IN_PROC(p, ttd)
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if (ttd == uap->id)
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break;
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if (ttd == NULL) {
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error = ESRCH;
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goto out;
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}
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if (uap->sig == 0)
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goto out;
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if (!_SIG_VALID(uap->sig)) {
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error = EINVAL;
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goto out;
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}
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/*
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* We need a way to force this to go into this thread's siglist.
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* Until then blocked signals will go to the proc.
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*/
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tdsignal(ttd, uap->sig);
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out:
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PROC_UNLOCK(p);
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return (error);
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}
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52
sys/sys/thr.h
Normal file
52
sys/sys/thr.h
Normal file
@ -0,0 +1,52 @@
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/*
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* Copyright (c) 2003, Jeffrey Roberson <jeff@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#ifndef _SYS_THR_H_
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#define _SYS_THR_H_
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/*
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* Globally unique thread id type.
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*/
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typedef void * thr_id_t;
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#define THR_SUSPENDED 0x0001 /* Create the thread in the suspended state. */
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/*
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* See pthread_*
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*/
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#ifndef _KERNEL
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int thr_create(ucontext_t *ctx, thr_id_t *id, int flags);
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int thr_self(thr_id_t *id);
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void thr_exit(void);
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int thr_kill(thr_id_t id, int sig);
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#endif /* !_KERNEL */
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#endif /* ! _SYS_THR_H_ */
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