- 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.

1 files changed, 259 insertions, 0 deletions

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 <jeff@freebsd.org>
+ * 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 <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/proc.h>
+#include <sys/resourcevar.h>
+#include <sys/sysent.h>
+#include <sys/systm.h>
+#include <sys/sysproto.h>
+#include <sys/signalvar.h>
+#include <sys/ucontext.h>
+#include <sys/thr.h>
+
+#include <machine/frame.h>
+
+/*
+ * 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);
+}