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1 | /* |
1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #ifndef __THREAD_H__ |
29 | #ifndef __THREAD_H__ |
30 | #define __THREAD_H__ |
30 | #define __THREAD_H__ |
31 | 31 | ||
32 | #include <arch/thread.h> |
32 | #include <arch/thread.h> |
33 | #include <synch/spinlock.h> |
33 | #include <synch/spinlock.h> |
34 | #include <arch/context.h> |
34 | #include <arch/context.h> |
35 | #include <fpu_context.h> |
35 | #include <fpu_context.h> |
36 | #include <arch/types.h> |
36 | #include <arch/types.h> |
37 | #include <typedefs.h> |
37 | #include <typedefs.h> |
38 | #include <time/timeout.h> |
38 | #include <time/timeout.h> |
39 | #include <synch/rwlock.h> |
39 | #include <synch/rwlock.h> |
40 | #include <config.h> |
40 | #include <config.h> |
41 | #include <list.h> |
41 | #include <list.h> |
42 | 42 | ||
43 | #define THREAD_STACK_SIZE STACK_SIZE |
43 | #define THREAD_STACK_SIZE STACK_SIZE |
44 | 44 | ||
45 | #define THREAD_USER_STACK 1 |
45 | #define THREAD_USER_STACK 1 |
46 | 46 | ||
47 | enum state { |
47 | enum state { |
48 | Invalid, /**< It is an error, if thread is found in this state. */ |
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. */ |
49 | Running, /**< State of a thread that is currently executing on some CPU. */ |
50 | Sleeping, /**< Thread in this state is waiting for an event. */ |
50 | Sleeping, /**< Thread in this state is waiting for an event. */ |
51 | Ready, /**< State of threads in a run queue. */ |
51 | Ready, /**< State of threads in a run queue. */ |
52 | Entering, /**< Threads are in this state before they are first readied. */ |
52 | Entering, /**< Threads are in this state before they are first readied. */ |
53 | Exiting /**< After a thread calls thread_exit(), it is put into Exiting state. */ |
53 | Exiting /**< After a thread calls thread_exit(), it is put into Exiting state. */ |
54 | }; |
54 | }; |
55 | 55 | ||
56 | extern char *thread_states[]; |
56 | extern char *thread_states[]; |
57 | 57 | ||
58 | #define X_WIRED (1<<0) |
58 | #define X_WIRED (1<<0) |
59 | #define X_STOLEN (1<<1) |
59 | #define X_STOLEN (1<<1) |
60 | 60 | ||
61 | struct thread { |
61 | struct thread { |
62 | link_t rq_link; /**< Run queue link. */ |
62 | link_t rq_link; /**< Run queue link. */ |
63 | link_t wq_link; /**< Wait queue link. */ |
63 | link_t wq_link; /**< Wait queue link. */ |
64 | link_t th_link; /**< Links to threads within containing task. */ |
64 | link_t th_link; /**< Links to threads within containing task. */ |
65 | link_t threads_link; /**< Link to the list of all threads. */ |
65 | link_t threads_link; /**< Link to the list of all threads. */ |
66 | 66 | ||
67 | /** Lock protecting thread structure. |
67 | /** Lock protecting thread structure. |
68 | * |
68 | * |
69 | * Protects the whole thread structure except list links above. |
69 | * Protects the whole thread structure except list links above. |
70 | * Must be acquired before T.lock for each T of type task_t. |
70 | * Must be acquired before T.lock for each T of type task_t. |
71 | * |
71 | * |
72 | */ |
72 | */ |
73 | spinlock_t lock; |
73 | SPINLOCK_DECLARE(lock); |
74 | 74 | ||
75 | void (* thread_code)(void *); /**< Function implementing the thread. */ |
75 | void (* thread_code)(void *); /**< Function implementing the thread. */ |
76 | void *thread_arg; /**< Argument passed to thread_code() function. */ |
76 | void *thread_arg; /**< Argument passed to thread_code() function. */ |
77 | 77 | ||
78 | context_t saved_context; /**< From here, the stored context is restored when the thread is scheduled. */ |
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. */ |
79 | context_t sleep_timeout_context; /**< From here, the stored failover context is restored when sleep times out. */ |
80 | 80 | ||
81 | waitq_t *sleep_queue; /**< Wait queue in which this thread sleeps. */ |
81 | waitq_t *sleep_queue; /**< Wait queue in which this thread sleeps. */ |
82 | timeout_t sleep_timeout; /**< Timeout used for timeoutable sleeping. */ |
82 | timeout_t sleep_timeout; /**< Timeout used for timeoutable sleeping. */ |
83 | volatile int timeout_pending; /**< Flag signalling sleep timeout in progress. */ |
83 | volatile int timeout_pending; /**< Flag signalling sleep timeout in progress. */ |
84 | 84 | ||
85 | fpu_context_t saved_fpu_context; |
85 | fpu_context_t saved_fpu_context; |
86 | int fpu_context_exists; |
86 | int fpu_context_exists; |
87 | 87 | ||
88 | /* |
88 | /* |
89 | * Defined only if thread doesn't run. |
89 | * Defined only if thread doesn't run. |
90 | * It means that fpu context is in CPU that last time executes this thread. |
90 | * It means that fpu context is in CPU that last time executes this thread. |
91 | * This disables migration |
91 | * This disables migration |
92 | */ |
92 | */ |
93 | int fpu_context_engaged; |
93 | int fpu_context_engaged; |
94 | 94 | ||
95 | rwlock_type_t rwlock_holder_type; |
95 | rwlock_type_t rwlock_holder_type; |
96 | 96 | ||
97 | void (* call_me)(void *); /**< Funtion to be called in scheduler before the thread is put asleep. */ |
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(). */ |
98 | void *call_me_with; /**< Argument passed to call_me(). */ |
99 | 99 | ||
100 | state_t state; /**< Thread's state. */ |
100 | state_t state; /**< Thread's state. */ |
101 | int flags; /**< Thread's flags. */ |
101 | int flags; /**< Thread's flags. */ |
102 | 102 | ||
103 | cpu_t *cpu; /**< Thread's CPU. */ |
103 | cpu_t *cpu; /**< Thread's CPU. */ |
104 | task_t *task; /**< Containing task. */ |
104 | task_t *task; /**< Containing task. */ |
105 | 105 | ||
106 | __u64 ticks; /**< Ticks before preemption. */ |
106 | __u64 ticks; /**< Ticks before preemption. */ |
107 | 107 | ||
108 | int priority; /**< Thread's priority. Implemented as index to CPU->rq */ |
108 | int priority; /**< Thread's priority. Implemented as index to CPU->rq */ |
109 | __u32 tid; /**< Thread ID. */ |
109 | __u32 tid; /**< Thread ID. */ |
110 | 110 | ||
111 | ARCH_THREAD_DATA; /**< Architecture-specific data. */ |
111 | ARCH_THREAD_DATA; /**< Architecture-specific data. */ |
112 | 112 | ||
113 | __u8 *kstack; /**< Thread's kernel stack. */ |
113 | __u8 *kstack; /**< Thread's kernel stack. */ |
114 | __u8 *ustack; /**< Thread's user stack. */ |
114 | __u8 *ustack; /**< Thread's user stack. */ |
115 | }; |
115 | }; |
116 | 116 | ||
117 | /** Thread list lock. |
117 | /** Thread list lock. |
118 | * |
118 | * |
119 | * This lock protects all link_t structures chained in threads_head. |
119 | * This lock protects all link_t structures chained in threads_head. |
120 | * Must be acquired before T.lock for each T of type thread_t. |
120 | * Must be acquired before T.lock for each T of type thread_t. |
121 | * |
121 | * |
122 | */ |
122 | */ |
123 | extern spinlock_t threads_lock; |
123 | extern spinlock_t threads_lock; |
124 | 124 | ||
125 | extern link_t threads_head; /**< List of all threads in the system. */ |
125 | extern link_t threads_head; /**< List of all threads in the system. */ |
126 | 126 | ||
127 | extern void thread_init(void); |
127 | extern void thread_init(void); |
128 | extern thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags); |
128 | extern thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags); |
129 | extern void thread_ready(thread_t *t); |
129 | extern void thread_ready(thread_t *t); |
130 | extern void thread_exit(void); |
130 | extern void thread_exit(void); |
131 | 131 | ||
132 | extern void thread_sleep(__u32 sec); |
132 | extern void thread_sleep(__u32 sec); |
133 | extern void thread_usleep(__u32 usec); |
133 | extern void thread_usleep(__u32 usec); |
134 | 134 | ||
135 | extern void thread_register_call_me(void (* call_me)(void *), void *call_me_with); |
135 | extern void thread_register_call_me(void (* call_me)(void *), void *call_me_with); |
136 | 136 | ||
137 | #endif |
137 | #endif |
138 | 138 |