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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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#ifndef __THREAD_H__
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#define __THREAD_H__
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#include <arch/proc/thread.h>
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#include <synch/spinlock.h>
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#include <arch/context.h>
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#include <fpu_context.h>
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#include <arch/types.h>
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#include <typedefs.h>
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#include <time/timeout.h>
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#include <synch/rwlock.h>
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#include <config.h>
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#include <adt/btree.h>
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#include <adt/list.h>
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#include <mm/slab.h>
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#include <proc/uarg.h>
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#define THREAD_STACK_SIZE   STACK_SIZE
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enum state {
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    Invalid,    /**< It is an error, if thread is found in this state. */
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    Running,    /**< State of a thread that is currently executing on some CPU. */
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    Sleeping,   /**< Thread in this state is waiting for an event. */
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    Ready,      /**< State of threads in a run queue. */
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    Entering,   /**< Threads are in this state before they are first readied. */
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    Exiting     /**< After a thread calls thread_exit(), it is put into Exiting state. */
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};
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extern char *thread_states[];
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#define X_WIRED     (1<<0)
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#define X_STOLEN    (1<<1)
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#define THREAD_NAME_BUFLEN  20
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/** Thread structure. There is one per thread. */
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struct thread {
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    link_t rq_link;             /**< Run queue link. */
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    link_t wq_link;             /**< Wait queue link. */
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    link_t th_link;             /**< Links to threads within containing task. */
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    /** Lock protecting thread structure.
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     *
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     * Protects the whole thread structure except list links above.
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     * Must be acquired before T.lock for each T of type task_t.
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     *
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     */
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    SPINLOCK_DECLARE(lock);
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    char name[THREAD_NAME_BUFLEN];
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    void (* thread_code)(void *);       /**< Function implementing the thread. */
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    void *thread_arg;           /**< Argument passed to thread_code() function. */
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    /** From here, the stored context is restored when the thread is scheduled. */
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    context_t saved_context;
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    /** From here, the stored timeout context is restored when sleep times out. */
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    context_t sleep_timeout_context;
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    /** From here, the stored interruption context is restored when sleep is interrupted. */
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    context_t sleep_interruption_context;
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    waitq_t *sleep_queue;           /**< Wait queue in which this thread sleeps. */
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    timeout_t sleep_timeout;        /**< Timeout used for timeoutable sleeping.  */
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    volatile int timeout_pending;       /**< Flag signalling sleep timeout in progress. */
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    /** True if this thread is executing copy_from_uspace(). False otherwise. */
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    bool in_copy_from_uspace;
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    /** True if this thread is executing copy_to_uspace(). False otherwise. */
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    bool in_copy_to_uspace;
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    fpu_context_t *saved_fpu_context;
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    int fpu_context_exists;
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    /*
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     * Defined only if thread doesn't run.
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     * It means that fpu context is in CPU that last time executes this thread.
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     * This disables migration
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     */
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    int fpu_context_engaged;
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    rwlock_type_t rwlock_holder_type;
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    void (* call_me)(void *);       /**< Funtion to be called in scheduler before the thread is put asleep. */
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    void *call_me_with;         /**< Argument passed to call_me(). */
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    state_t state;              /**< Thread's state. */
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    int flags;              /**< Thread's flags. */
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    cpu_t *cpu;             /**< Thread's CPU. */
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    task_t *task;               /**< Containing task. */
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    __u64 ticks;                /**< Ticks before preemption. */
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    int priority;               /**< Thread's priority. Implemented as index to CPU->rq */
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    __u32 tid;              /**< Thread ID. */
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    thread_arch_t arch;         /**< Architecture-specific data. */
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    __u8 *kstack;               /**< Thread's kernel stack. */
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};
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/** Thread list lock.
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 *
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 * This lock protects all link_t structures chained in threads_head.
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 * Must be acquired before T.lock for each T of type thread_t.
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 *
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 */
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extern spinlock_t threads_lock;
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extern btree_t threads_btree;           /**< B+tree containing all threads. */
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extern void thread_init(void);
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extern thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags, char *name);
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extern void thread_ready(thread_t *t);
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extern void thread_exit(void);
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#ifndef thread_create_arch
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extern void thread_create_arch(thread_t *t);
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#endif
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extern void thread_sleep(__u32 sec);
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extern void thread_usleep(__u32 usec);
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extern void thread_register_call_me(void (* call_me)(void *), void *call_me_with);
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extern void thread_print_list(void);
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extern void thread_destroy(thread_t *t);
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extern bool thread_exists(thread_t *t);
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/* Fpu context slab cache */
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extern slab_cache_t *fpu_context_slab;
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/** Thread syscall prototypes. */
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__native sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name);
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__native sys_thread_exit(int uspace_status);
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#endif