FreeBSD/Linux Kernel Cross Reference
sys/cddl/compat/opensolaris/kern/opensolaris_taskq.c

     /*-
      * Copyright (c) 2009 Pawel Jakub Dawidek <pjd@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, 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 AUTHORS AND CONTRIBUTORS ``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 AUTHORS OR CONTRIBUTORS 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/kmem.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    #include <sys/queue.h>
    #include <sys/taskqueue.h>
    #include <sys/taskq.h>
    
    #include <vm/uma.h>
    
    static uma_zone_t taskq_zone;
    
    taskq_t *system_taskq = NULL;
    
    struct proc *system_proc;
    
    static void
    system_taskq_init(void *arg)
    {
    
            taskq_zone = uma_zcreate("taskq_zone", sizeof(taskq_ent_t),
                NULL, NULL, NULL, NULL, 0, 0);
            system_taskq = taskq_create("system_taskq", mp_ncpus, minclsyspri,
                0, 0, 0);
    }
    SYSINIT(system_taskq_init, SI_SUB_CONFIGURE, SI_ORDER_ANY, system_taskq_init, NULL);
    
    static void
    system_taskq_fini(void *arg)
    {
    
            taskq_destroy(system_taskq);
            uma_zdestroy(taskq_zone);
    }
    SYSUNINIT(system_taskq_fini, SI_SUB_CONFIGURE, SI_ORDER_ANY, system_taskq_fini, NULL);
    
    static taskq_t *
    taskq_create_impl(const char *name, int nthreads, pri_t pri, proc_t *proc,
        uint_t flags)
    {
            taskq_t *tq;
    
            if ((flags & TASKQ_THREADS_CPU_PCT) != 0)
                    nthreads = MAX((mp_ncpus * nthreads) / 100, 1);
    
            tq = kmem_alloc(sizeof(*tq), KM_SLEEP);
            tq->tq_queue = taskqueue_create(name, M_WAITOK, taskqueue_thread_enqueue,
                &tq->tq_queue);
            (void) taskqueue_start_threads_in_proc(&tq->tq_queue, nthreads, pri,
                proc, "%s", name);
    
            return ((taskq_t *)tq);
    }
    
    taskq_t *
    taskq_create(const char *name, int nthreads, pri_t pri, int minalloc __unused,
        int maxalloc __unused, uint_t flags)
    {
            return (taskq_create_impl(name, nthreads, pri, system_proc, flags));
    }
    
    taskq_t *
    taskq_create_proc(const char *name, int nthreads, pri_t pri, int minalloc,
        int maxalloc, proc_t *proc, uint_t flags)
    {
            return (taskq_create_impl(name, nthreads, pri, proc, flags));
    }
    
    void
   taskq_destroy(taskq_t *tq)
   {
   
           taskqueue_free(tq->tq_queue);
           kmem_free(tq, sizeof(*tq));
   }
   
   int
   taskq_member(taskq_t *tq, kthread_t *thread)
   {
   
           return (taskqueue_member(tq->tq_queue, thread));
   }
   
   static void
   taskq_run(void *arg, int pending __unused)
   {
           taskq_ent_t *task = arg;
   
           task->tqent_func(task->tqent_arg);
   
           uma_zfree(taskq_zone, task);
   }
   
   taskqid_t
   taskq_dispatch(taskq_t *tq, task_func_t func, void *arg, uint_t flags)
   {
           taskq_ent_t *task;
           int mflag, prio;
   
           if ((flags & (TQ_SLEEP | TQ_NOQUEUE)) == TQ_SLEEP)
                   mflag = M_WAITOK;
           else
                   mflag = M_NOWAIT;
           /*
            * If TQ_FRONT is given, we want higher priority for this task, so it
            * can go at the front of the queue.
            */
           prio = !!(flags & TQ_FRONT);
   
           task = uma_zalloc(taskq_zone, mflag);
           if (task == NULL)
                   return (0);
   
           task->tqent_func = func;
           task->tqent_arg = arg;
   
           TASK_INIT(&task->tqent_task, prio, taskq_run, task);
           taskqueue_enqueue(tq->tq_queue, &task->tqent_task);
   
           return ((taskqid_t)(void *)task);
   }
   
   static void
   taskq_run_ent(void *arg, int pending __unused)
   {
           taskq_ent_t *task = arg;
   
           task->tqent_func(task->tqent_arg);
   }
   
   void
   taskq_dispatch_ent(taskq_t *tq, task_func_t func, void *arg, u_int flags,
       taskq_ent_t *task)
   {
           int prio;
   
           /*
            * If TQ_FRONT is given, we want higher priority for this task, so it
            * can go at the front of the queue.
            */
           prio = !!(flags & TQ_FRONT);
   
           task->tqent_func = func;
           task->tqent_arg = arg;
   
           TASK_INIT(&task->tqent_task, prio, taskq_run_ent, task);
           taskqueue_enqueue(tq->tq_queue, &task->tqent_task);
   }
   
   void
   taskq_wait(taskq_t *tq)
   {
           taskqueue_quiesce(tq->tq_queue);
   }
   
   void
   taskq_wait_id(taskq_t *tq, taskqid_t id)
   {
           taskqueue_drain_all(tq->tq_queue);
   }

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