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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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1702 cejka 29
 /** @addtogroup genericproc
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 * @{
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 */
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/** @file
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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 <synch/synch.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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1661 jermar 55
/**< Thread states. */
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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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    Undead      /**< Threads that were not detached but exited are in the Undead state. */
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};
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extern char *thread_states[];
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1661 jermar 68
/**< Join types. */
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typedef enum {
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    None,
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    TaskClnp,   /**< The thread will be joined by ktaskclnp thread. */
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    TaskGC      /**< The thread will be joined by ktaskgc thread. */
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} thread_join_type_t;
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1 jermar 75
#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. */
1 jermar 81
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. */
1 jermar 85
 
557 jermar 86
    /** 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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     */
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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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    bool sleep_interruptible;       /**< If true, the thread can be interrupted from sleep. */
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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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    /**
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     * If true, the thread will not go to sleep at all and will
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     * call thread_exit() before returning to userspace.
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     */
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    bool interrupted;          
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    thread_join_type_t  join_type;  /**< Who joinins the thread. */
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    bool detached;              /**< If true, thread_join_timeout() cannot be used on this thread. */
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    waitq_t join_wq;            /**< Waitq for thread_join_timeout(). */
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906 palkovsky 124
    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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1 jermar 134
    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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410 jermar 142
    cpu_t *cpu;             /**< Thread's CPU. */
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    task_t *task;               /**< Containing task. */
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410 jermar 145
    __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. */
1 jermar 149
 
1184 jermar 150
    thread_arch_t arch;         /**< Architecture-specific data. */
1 jermar 151
 
410 jermar 152
    __u8 *kstack;               /**< Thread's kernel stack. */
1 jermar 153
};
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557 jermar 155
/** 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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1158 jermar 163
extern btree_t threads_btree;           /**< B+tree containing all threads. */
1 jermar 164
 
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extern void thread_init(void);
1062 jermar 166
extern thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags, char *name);
1 jermar 167
extern void thread_ready(thread_t *t);
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extern void thread_exit(void) __attribute__((noreturn));
1 jermar 169
 
1171 jermar 170
#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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1 jermar 174
extern void thread_sleep(__u32 sec);
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extern void thread_usleep(__u32 usec);
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1576 jermar 177
#define thread_join(t)  thread_join_timeout((t), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE)
1571 jermar 178
extern int thread_join_timeout(thread_t *t, __u32 usec, int flags);
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extern void thread_detach(thread_t *t);
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1 jermar 181
extern void thread_register_call_me(void (* call_me)(void *), void *call_me_with);
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extern void thread_print_list(void);
787 palkovsky 183
extern void thread_destroy(thread_t *t);
1158 jermar 184
extern bool thread_exists(thread_t *t);
1 jermar 185
 
906 palkovsky 186
/* Fpu context slab cache */
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extern slab_cache_t *fpu_context_slab;
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1066 jermar 189
/** Thread syscall prototypes. */
1078 jermar 190
__native sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name);
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__native sys_thread_exit(int uspace_status);
1066 jermar 192
 
1 jermar 193
#endif
1702 cejka 194
 
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 /** @}
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 */
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