Add the following to the taskqueue api:

taskqueue_start_threads(struct taskqueue **, int count, int pri,
			const char *name, ...);

This allows the creation of 1 or more threads that will service a single
taskqueue.  Also rework the taskqueue_create() API to remove the API change
that was introduced a while back.  Creating a taskqueue doesn't rely on
the presence of a process structure, and the proc mechanics are much better
encapsulated in taskqueue_start_threads().  Also clean up the
taskqueue_terminate() and taskqueue_free() functions to safely drain
pending tasks and remove all associated threads.

The TASKQUEUE_DEFINE and TASKQUEUE_DEFINE_THREAD macros have been changed
to use the new API, but drivers compiled against the old definitions will
still work.  Thus, recompiling drivers is not a strict requirement.

1 files changed, 1 insertions, 24 deletions

diff --git a/sys/dev/acpica/Osd/OsdSchedule.c b/sys/dev/acpica/Osd/OsdSchedule.c
index f1e84e4..1e8aeca 100644
--- a/sys/dev/acpica/Osd/OsdSchedule.c
+++ b/sys/dev/acpica/Osd/OsdSchedule.c
@@ -65,31 +65,8 @@ struct acpi_task_ctx {
     void 			*at_context;
 };
 
-/*
- * Private task queue definition for ACPI
- */
-static struct proc *
-acpi_task_start_threads(struct taskqueue **tqp)
-{
-    struct proc	*acpi_kthread_proc;
-    int	err, i;
-
-    KASSERT(*tqp != NULL, ("acpi taskqueue not created before threads"));
-
-    /* Start one or more threads to service our taskqueue. */
-    for (i = 0; i < acpi_max_threads; i++) {
-	err = kthread_create(taskqueue_thread_loop, tqp, &acpi_kthread_proc,
-	    0, 0, "acpi_task%d", i);
-	if (err) {
-	    printf("%s: kthread_create failed (%d)\n", __func__, err);
-	    break;
-	}
-    }
-    return (acpi_kthread_proc);
-}
-
 TASKQUEUE_DEFINE(acpi, taskqueue_thread_enqueue, &taskqueue_acpi,
-    taskqueue_acpi_proc = acpi_task_start_threads(&taskqueue_acpi));
+    taskqueue_start_threads(&taskqueue_acpi, 3, PWAIT, "acpi_task"));
 
 /*
  * Bounce through this wrapper function since ACPI-CA doesn't understand