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| 1 | jermar | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | #ifndef __THREAD_H__ |
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| 30 | #define __THREAD_H__ |
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| 31 | |||
| 32 | #include <arch/thread.h> |
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| 33 | #include <synch/spinlock.h> |
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| 34 | #include <arch/context.h> |
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| 56 | vana | 35 | #include <fpu_context.h> |
| 1 | jermar | 36 | #include <arch/types.h> |
| 37 | #include <typedefs.h> |
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| 38 | #include <time/timeout.h> |
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| 39 | #include <synch/rwlock.h> |
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| 173 | jermar | 40 | #include <config.h> |
| 1 | jermar | 41 | #include <list.h> |
| 42 | |||
| 173 | jermar | 43 | #define THREAD_STACK_SIZE STACK_SIZE |
| 1 | jermar | 44 | |
| 45 | #define THREAD_USER_STACK 1 |
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| 46 | |||
| 47 | enum state { |
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| 410 | jermar | 48 | Invalid, /**< It is an error, if thread is found in this state. */ |
| 49 | Running, /**< State of a thread that is currently executing on some CPU. */ |
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| 50 | Sleeping, /**< Thread in this state is waiting for an event. */ |
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| 51 | Ready, /**< State of threads in a run queue. */ |
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| 52 | Entering, /**< Threads are in this state before they are first readied. */ |
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| 53 | Exiting /**< After a thread calls thread_exit(), it is put into Exiting state. */ |
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| 1 | jermar | 54 | }; |
| 55 | |||
| 56 | extern char *thread_states[]; |
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| 57 | |||
| 58 | #define X_WIRED (1<<0) |
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| 59 | #define X_STOLEN (1<<1) |
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| 60 | |||
| 61 | struct thread { |
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| 410 | jermar | 62 | link_t rq_link; /**< Run queue link. */ |
| 63 | link_t wq_link; /**< Wait queue link. */ |
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| 64 | link_t th_link; /**< Links to threads within containing task. */ |
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| 65 | link_t threads_link; /**< Link to the list of all threads. */ |
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| 1 | jermar | 66 | |
| 557 | jermar | 67 | /** Lock protecting thread structure. |
| 68 | * |
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| 69 | * Protects the whole thread structure except list links above. |
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| 70 | * Must be acquired before T.lock for each T of type task_t. |
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| 71 | * |
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| 72 | */ |
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| 623 | jermar | 73 | SPINLOCK_DECLARE(lock); |
| 1 | jermar | 74 | |
| 410 | jermar | 75 | void (* thread_code)(void *); /**< Function implementing the thread. */ |
| 76 | void *thread_arg; /**< Argument passed to thread_code() function. */ |
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| 1 | jermar | 77 | |
| 410 | jermar | 78 | context_t saved_context; /**< From here, the stored context is restored when the thread is scheduled. */ |
| 79 | context_t sleep_timeout_context; /**< From here, the stored failover context is restored when sleep times out. */ |
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| 80 | |||
| 81 | waitq_t *sleep_queue; /**< Wait queue in which this thread sleeps. */ |
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| 82 | timeout_t sleep_timeout; /**< Timeout used for timeoutable sleeping. */ |
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| 83 | volatile int timeout_pending; /**< Flag signalling sleep timeout in progress. */ |
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| 84 | |||
| 125 | jermar | 85 | fpu_context_t saved_fpu_context; |
| 86 | int fpu_context_exists; |
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| 87 | |||
| 88 | /* |
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| 89 | * Defined only if thread doesn't run. |
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| 90 | * It means that fpu context is in CPU that last time executes this thread. |
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| 91 | * This disables migration |
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| 92 | */ |
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| 93 | int fpu_context_engaged; |
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| 94 | |||
| 1 | jermar | 95 | rwlock_type_t rwlock_holder_type; |
| 96 | |||
| 410 | jermar | 97 | void (* call_me)(void *); /**< Funtion to be called in scheduler before the thread is put asleep. */ |
| 98 | void *call_me_with; /**< Argument passed to call_me(). */ |
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| 99 | |||
| 100 | state_t state; /**< Thread's state. */ |
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| 101 | int flags; /**< Thread's flags. */ |
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| 1 | jermar | 102 | |
| 410 | jermar | 103 | cpu_t *cpu; /**< Thread's CPU. */ |
| 104 | task_t *task; /**< Containing task. */ |
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| 1 | jermar | 105 | |
| 410 | jermar | 106 | __u64 ticks; /**< Ticks before preemption. */ |
| 1 | jermar | 107 | |
| 413 | jermar | 108 | int priority; /**< Thread's priority. Implemented as index to CPU->rq */ |
| 410 | jermar | 109 | __u32 tid; /**< Thread ID. */ |
| 1 | jermar | 110 | |
| 410 | jermar | 111 | ARCH_THREAD_DATA; /**< Architecture-specific data. */ |
| 1 | jermar | 112 | |
| 410 | jermar | 113 | __u8 *kstack; /**< Thread's kernel stack. */ |
| 114 | __u8 *ustack; /**< Thread's user stack. */ |
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| 1 | jermar | 115 | }; |
| 116 | |||
| 557 | jermar | 117 | /** Thread list lock. |
| 118 | * |
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| 119 | * This lock protects all link_t structures chained in threads_head. |
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| 120 | * Must be acquired before T.lock for each T of type thread_t. |
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| 121 | * |
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| 122 | */ |
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| 123 | extern spinlock_t threads_lock; |
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| 124 | |||
| 410 | jermar | 125 | extern link_t threads_head; /**< List of all threads in the system. */ |
| 1 | jermar | 126 | |
| 127 | extern void thread_init(void); |
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| 128 | extern thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags); |
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| 129 | extern void thread_ready(thread_t *t); |
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| 130 | extern void thread_exit(void); |
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| 131 | |||
| 132 | extern void thread_sleep(__u32 sec); |
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| 133 | extern void thread_usleep(__u32 usec); |
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| 134 | |||
| 135 | extern void thread_register_call_me(void (* call_me)(void *), void *call_me_with); |
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| 136 | |||
| 137 | #endif |