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1 jermar 1
/*
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 * Copyright (C) 2001-2004 Jakub Jermar
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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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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - 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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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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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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#include <proc/thread.h>
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#include <proc/task.h>
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#include <mm/vm.h>
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#include <mm/heap.h>
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#include <synch/spinlock.h>
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#include <arch.h>
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#include <panic.h>
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#include <list.h>
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spinlock_t tasks_lock;
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link_t tasks_head;
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/** Initialize tasks
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 *
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 * Initialize kernel tasks support.
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 *
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 */
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void task_init(void)
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{
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    TASK = NULL;
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    spinlock_initialize(&tasks_lock);
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    list_initialize(&tasks_head);
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}
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/** Create new task
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 *
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 * Create new task with no threads.
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 *
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 * @param m Task's virtual memory structure.
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 *
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 * @return New task's structure on success, NULL on failure.
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 *
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 */
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task_t *task_create(vm_t *m)
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{
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    pri_t pri;
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    task_t *ta;
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    ta = (task_t *) malloc(sizeof(task_t));
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    if (ta) {
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        spinlock_initialize(&ta->lock);
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        list_initialize(&ta->th_head);
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        list_initialize(&ta->tasks_link);
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        ta->vm = m;
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        pri = cpu_priority_high();
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        spinlock_lock(&tasks_lock);
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        list_append(&ta->tasks_link, &tasks_head);
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        spinlock_unlock(&tasks_lock);
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        cpu_priority_restore(pri);
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    }
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    return ta;
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}
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