0,0 → 1,125 |
/* |
* Copyright (C) 2001-2004 Jakub Jermar |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - 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. |
* - The name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. |
*/ |
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#ifndef __THREAD_H__ |
#define __THREAD_H__ |
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#include <arch/thread.h> |
#include <synch/spinlock.h> |
#include <arch/context.h> |
#include <fpu_context.h> |
#include <arch/types.h> |
#include <typedefs.h> |
#include <time/timeout.h> |
#include <synch/rwlock.h> |
#include <config.h> |
#include <list.h> |
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#define THREAD_STACK_SIZE STACK_SIZE |
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#define THREAD_USER_STACK 1 |
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enum state { |
Invalid, /**< It is an error, if thread is found in this state. */ |
Running, /**< State of a thread that is currently executing on some CPU. */ |
Sleeping, /**< Thread in this state is waiting for an event. */ |
Ready, /**< State of threads in a run queue. */ |
Entering, /**< Threads are in this state before they are first readied. */ |
Exiting /**< After a thread calls thread_exit(), it is put into Exiting state. */ |
}; |
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extern char *thread_states[]; |
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#define X_WIRED (1<<0) |
#define X_STOLEN (1<<1) |
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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. */ |
link_t threads_link; /**< Link to the list of all threads. */ |
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/* items below are protected by lock */ |
spinlock_t lock; |
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void (* thread_code)(void *); /**< Function implementing the thread. */ |
void *thread_arg; /**< Argument passed to thread_code() function. */ |
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context_t saved_context; /**< From here, the stored context is restored when the thread is scheduled. */ |
context_t sleep_timeout_context; /**< From here, the stored failover context is restored when sleep times out. */ |
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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. */ |
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fpu_context_t saved_fpu_context; |
int fpu_context_exists; |
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/* |
* 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; |
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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. */ |
void *call_me_with; /**< Argument passed to call_me(). */ |
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state_t state; /**< Thread's state. */ |
int flags; /**< Thread's flags. */ |
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cpu_t *cpu; /**< Thread's CPU. */ |
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 */ |
__u32 tid; /**< Thread ID. */ |
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ARCH_THREAD_DATA; /**< Architecture-specific data. */ |
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__u8 *kstack; /**< Thread's kernel stack. */ |
__u8 *ustack; /**< Thread's user stack. */ |
}; |
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extern spinlock_t threads_lock; /**< Lock protecting threads_head list. */ |
extern link_t threads_head; /**< List of all threads in the system. */ |
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extern void thread_init(void); |
extern thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags); |
extern void thread_ready(thread_t *t); |
extern void thread_exit(void); |
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extern void thread_sleep(__u32 sec); |
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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#endif |