Subversion Repositories HelenOS

#define THREAD_NAME_BUFLEN  20

/** Thread structure. There is one per thread. */

typedef struct thread {

    link_t rq_link;             /**< Run queue link. */

    link_t wq_link;             /**< Wait queue link. */

    link_t th_link;             /**< Links to threads within containing task. */

    /** Lock protecting thread structure.

     *

     * Protects the whole thread structure except list links above.

     */

    SPINLOCK_DECLARE(lock);

    char name[THREAD_NAME_BUFLEN];

    void (* thread_code)(void *);       /**< Function implementing the thread. */

    void *thread_arg;           /**< Argument passed to thread_code() function. */

    /** From here, the stored context is restored when the thread is scheduled. */

    context_t saved_context;

    /** From here, the stored timeout context is restored when sleep times out. */

    context_t sleep_timeout_context;

    /** From here, the stored interruption context is restored when sleep is interrupted. */

    context_t sleep_interruption_context;

    bool sleep_interruptible;       /**< If true, the thread can be interrupted from sleep. */

    waitq_t *sleep_queue;           /**< Wait queue in which this thread sleeps. */

    timeout_t sleep_timeout;        /**< Timeout used for timeoutable sleeping.  */

    volatile int timeout_pending;       /**< Flag signalling sleep timeout in progress. */

    /** True if this thread is executing copy_from_uspace(). False otherwise. */

    bool in_copy_from_uspace;

    /** True if this thread is executing copy_to_uspace(). False otherwise. */

    bool in_copy_to_uspace;

    /**

     * If true, the thread will not go to sleep at all and will

     * call thread_exit() before returning to userspace.

     */

    bool interrupted;          

    thread_join_type_t  join_type;  /**< Who joinins the thread. */

    bool detached;              /**< If true, thread_join_timeout() cannot be used on this thread. */

    waitq_t join_wq;            /**< Waitq for thread_join_timeout(). */

    fpu_context_t *saved_fpu_context;

    int fpu_context_exists;

    /*

     * Defined only if thread doesn't run.

     * It means that fpu context is in CPU that last time executes this thread.

     * This disables migration.

     */

    int fpu_context_engaged;

    rwlock_type_t rwlock_holder_type;

    void (* call_me)(void *);       /**< Funtion to be called in scheduler before the thread is put asleep. */

    void *call_me_with;         /**< Argument passed to call_me(). */

    state_t state;              /**< Thread's state. */

    int flags;              /**< Thread's flags. */

    cpu_t *cpu;             /**< Thread's CPU. */

    task_t *task;               /**< Containing task. */

    uint64_t ticks;             /**< Ticks before preemption. */

    uint64_t cycles;            /**< Thread accounting. */

    uint64_t last_cycle;        /**< Last sampled cycle. */

    bool uncounted;             /**< Thread doesn't affect accumulated accounting. */

    int priority;               /**< Thread's priority. Implemented as index to CPU->rq */

    uint32_t tid;               /**< Thread ID. */

    thread_arch_t arch;         /**< Architecture-specific data. */

    uint8_t *kstack;            /**< Thread's kernel stack. */

} thread_t;