source: mainline/generic/include/proc/thread.h@ e3c762cd

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since e3c762cd was e3c762cd, checked in by Jakub Jermar <jakub@…>, 19 years ago

Complete implementation of copy_from_uspace() and copy_to_uspace()
for amd64 and ia32. Other architectures still compile and run,
but need to implement their own assembly-only memcpy(), memcpy_from_uspace(),
memcpy_to_uspace() and their failover parts. For these architectures
only dummy implementations are provided.
  • Property mode set to 100644
File size: 5.6 KB
Line 
1/*
2 * Copyright (C) 2001-2004 Jakub Jermar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
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
15 * derived from this software without specific prior written permission.
16 *
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
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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
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
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef __THREAD_H__
30#define __THREAD_H__
31
32#include <arch/proc/thread.h>
33#include <synch/spinlock.h>
34#include <arch/context.h>
35#include <fpu_context.h>
36#include <arch/types.h>
37#include <typedefs.h>
38#include <time/timeout.h>
39#include <synch/rwlock.h>
40#include <config.h>
41#include <adt/btree.h>
42#include <adt/list.h>
43#include <mm/slab.h>
44#include <proc/uarg.h>
45
46#define THREAD_STACK_SIZE STACK_SIZE
47
48enum state {
49 Invalid, /**< It is an error, if thread is found in this state. */
50 Running, /**< State of a thread that is currently executing on some CPU. */
51 Sleeping, /**< Thread in this state is waiting for an event. */
52 Ready, /**< State of threads in a run queue. */
53 Entering, /**< Threads are in this state before they are first readied. */
54 Exiting /**< After a thread calls thread_exit(), it is put into Exiting state. */
55};
56
57extern char *thread_states[];
58
59#define X_WIRED (1<<0)
60#define X_STOLEN (1<<1)
61
62#define THREAD_NAME_BUFLEN 20
63
64/** Thread structure. There is one per thread. */
65struct thread {
66 link_t rq_link; /**< Run queue link. */
67 link_t wq_link; /**< Wait queue link. */
68 link_t th_link; /**< Links to threads within containing task. */
69
70 /** Lock protecting thread structure.
71 *
72 * Protects the whole thread structure except list links above.
73 * Must be acquired before T.lock for each T of type task_t.
74 *
75 */
76 SPINLOCK_DECLARE(lock);
77
78 char name[THREAD_NAME_BUFLEN];
79
80 void (* thread_code)(void *); /**< Function implementing the thread. */
81 void *thread_arg; /**< Argument passed to thread_code() function. */
82
83 /** From here, the stored context is restored when the thread is scheduled. */
84 context_t saved_context;
85 /** From here, the stored timeout context is restored when sleep times out. */
86 context_t sleep_timeout_context;
87 /** From here, the stored interruption context is restored when sleep is interrupted. */
88 context_t sleep_interruption_context;
89
90 waitq_t *sleep_queue; /**< Wait queue in which this thread sleeps. */
91 timeout_t sleep_timeout; /**< Timeout used for timeoutable sleeping. */
92 volatile int timeout_pending; /**< Flag signalling sleep timeout in progress. */
93
94 /** True if this thread is executing copy_from_uspace(). False otherwise. */
95 bool in_copy_from_uspace;
96 /** True if this thread is executing copy_to_uspace(). False otherwise. */
97 bool in_copy_to_uspace;
98
99
100 fpu_context_t *saved_fpu_context;
101 int fpu_context_exists;
102
103 /*
104 * Defined only if thread doesn't run.
105 * It means that fpu context is in CPU that last time executes this thread.
106 * This disables migration
107 */
108 int fpu_context_engaged;
109
110 rwlock_type_t rwlock_holder_type;
111
112 void (* call_me)(void *); /**< Funtion to be called in scheduler before the thread is put asleep. */
113 void *call_me_with; /**< Argument passed to call_me(). */
114
115 state_t state; /**< Thread's state. */
116 int flags; /**< Thread's flags. */
117
118 cpu_t *cpu; /**< Thread's CPU. */
119 task_t *task; /**< Containing task. */
120
121 __u64 ticks; /**< Ticks before preemption. */
122
123 int priority; /**< Thread's priority. Implemented as index to CPU->rq */
124 __u32 tid; /**< Thread ID. */
125
126 thread_arch_t arch; /**< Architecture-specific data. */
127
128 __u8 *kstack; /**< Thread's kernel stack. */
129};
130
131/** Thread list lock.
132 *
133 * This lock protects all link_t structures chained in threads_head.
134 * Must be acquired before T.lock for each T of type thread_t.
135 *
136 */
137extern spinlock_t threads_lock;
138
139extern btree_t threads_btree; /**< B+tree containing all threads. */
140
141extern void thread_init(void);
142extern thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags, char *name);
143extern void thread_ready(thread_t *t);
144extern void thread_exit(void);
145
146#ifndef thread_create_arch
147extern void thread_create_arch(thread_t *t);
148#endif
149
150extern void thread_sleep(__u32 sec);
151extern void thread_usleep(__u32 usec);
152
153extern void thread_register_call_me(void (* call_me)(void *), void *call_me_with);
154extern void thread_print_list(void);
155extern void thread_destroy(thread_t *t);
156extern bool thread_exists(thread_t *t);
157
158/* Fpu context slab cache */
159extern slab_cache_t *fpu_context_slab;
160
161/** Thread syscall prototypes. */
162__native sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name);
163__native sys_thread_exit(int uspace_status);
164
165#endif
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