source: mainline/kernel/generic/include/proc/thread.h@ aae2869

ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since aae2869 was aae2869, checked in by Jiří Zárevúcky <zarevucky.jiri@…>, 2 years ago

Replace THREAD→ticks with CPU→preempt_deadline

This removes a bit of unnecessary locking in clock().
  • Property mode set to 100644
File size: 7.5 KB
Line 
1/*
2 * Copyright (c) 2001-2007 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/** @addtogroup kernel_generic_proc
30 * @{
31 */
32/** @file
33 */
34
35#ifndef KERN_THREAD_H_
36#define KERN_THREAD_H_
37
38#include <synch/waitq.h>
39#include <proc/task.h>
40#include <time/timeout.h>
41#include <cpu.h>
42#include <synch/spinlock.h>
43#include <adt/odict.h>
44#include <mm/slab.h>
45#include <arch/cpu.h>
46#include <mm/tlb.h>
47#include <abi/proc/uarg.h>
48#include <udebug/udebug.h>
49#include <abi/proc/thread.h>
50#include <abi/sysinfo.h>
51#include <arch.h>
52
53#define THREAD CURRENT->thread
54
55#define THREAD_NAME_BUFLEN 20
56
57extern const char *thread_states[];
58
59/* Thread flags */
60typedef enum {
61 THREAD_FLAG_NONE = 0,
62 /** Thread executes in user space. */
63 THREAD_FLAG_USPACE = (1 << 0),
64 /** Thread will be attached by the caller. */
65 THREAD_FLAG_NOATTACH = (1 << 1),
66 /** Thread accounting doesn't affect accumulated task accounting. */
67 THREAD_FLAG_UNCOUNTED = (1 << 2)
68} thread_flags_t;
69
70/** Thread structure. There is one per thread. */
71typedef struct thread {
72 link_t rq_link; /**< Run queue link. */
73 link_t wq_link; /**< Wait queue link. */
74 link_t th_link; /**< Links to threads within containing task. */
75
76 /** Link to @c threads ordered dictionary. */
77 odlink_t lthreads;
78
79 /** Lock protecting thread structure.
80 *
81 * Protects the whole thread structure except list links above.
82 */
83 IRQ_SPINLOCK_DECLARE(lock);
84
85 char name[THREAD_NAME_BUFLEN];
86
87 /** Function implementing the thread. */
88 void (*thread_code)(void *);
89 /** Argument passed to thread_code() function. */
90 void *thread_arg;
91
92 /**
93 * From here, the stored context is restored
94 * when the thread is scheduled.
95 */
96 context_t saved_context;
97
98 /**
99 * From here, the stored timeout context
100 * is restored when sleep times out.
101 */
102 context_t sleep_timeout_context;
103
104 /**
105 * From here, the stored interruption context
106 * is restored when sleep is interrupted.
107 */
108 context_t sleep_interruption_context;
109
110 /** If true, the thread can be interrupted from sleep. */
111 bool sleep_interruptible;
112
113 /**
114 * If true, and this thread's sleep returns without a wakeup
115 * (timed out or interrupted), waitq ignores the next wakeup.
116 * This is necessary for futex to be able to handle those conditions.
117 */
118 bool sleep_composable;
119
120 /** Wait queue in which this thread sleeps. */
121 waitq_t *sleep_queue;
122 /** Timeout used for timeoutable sleeping. */
123 timeout_t sleep_timeout;
124 /** Flag signalling sleep timeout in progress. */
125 volatile bool timeout_pending;
126
127 /**
128 * True if this thread is executing copy_from_uspace().
129 * False otherwise.
130 */
131 bool in_copy_from_uspace;
132
133 /**
134 * True if this thread is executing copy_to_uspace().
135 * False otherwise.
136 */
137 bool in_copy_to_uspace;
138
139 /**
140 * If true, the thread will not go to sleep at all and will call
141 * thread_exit() before returning to userspace.
142 */
143 bool interrupted;
144
145 /** If true, thread_join_timeout() cannot be used on this thread. */
146 bool detached;
147 /** Waitq for thread_join_timeout(). */
148 waitq_t join_wq;
149 /** Link used in the joiner_head list. */
150 link_t joiner_link;
151
152 fpu_context_t *saved_fpu_context;
153 bool fpu_context_exists;
154
155 /*
156 * Defined only if thread doesn't run.
157 * It means that fpu context is in CPU that last time executes this
158 * thread. This disables migration.
159 */
160 bool fpu_context_engaged;
161
162 /* The thread will not be migrated if nomigrate is non-zero. */
163 unsigned int nomigrate;
164
165 /** Thread state. */
166 state_t state;
167
168 /** Thread CPU. */
169 cpu_t *cpu;
170 /** Containing task. */
171 task_t *task;
172 /** Thread is wired to CPU. */
173 bool wired;
174 /** Thread was migrated to another CPU and has not run yet. */
175 bool stolen;
176 /** Thread is executed in user space. */
177 bool uspace;
178
179 /** Thread accounting. */
180 uint64_t ucycles;
181 uint64_t kcycles;
182 /** Last sampled cycle. */
183 uint64_t last_cycle;
184 /** Thread doesn't affect accumulated accounting. */
185 bool uncounted;
186
187 /** Thread's priority. Implemented as index to CPU->rq */
188 int priority;
189 /** Thread ID. */
190 thread_id_t tid;
191
192 /** Architecture-specific data. */
193 thread_arch_t arch;
194
195 /** Thread's kernel stack. */
196 uint8_t *kstack;
197
198#ifdef CONFIG_UDEBUG
199 /**
200 * If true, the scheduler will print a stack trace
201 * to the kernel console upon scheduling this thread.
202 */
203 bool btrace;
204
205 /** Debugging stuff */
206 udebug_thread_t udebug;
207#endif /* CONFIG_UDEBUG */
208} thread_t;
209
210IRQ_SPINLOCK_EXTERN(threads_lock);
211extern odict_t threads;
212
213extern void thread_init(void);
214extern thread_t *thread_create(void (*)(void *), void *, task_t *,
215 thread_flags_t, const char *);
216extern void thread_wire(thread_t *, cpu_t *);
217extern void thread_attach(thread_t *, task_t *);
218extern void thread_ready(thread_t *);
219extern void thread_exit(void) __attribute__((noreturn));
220extern void thread_interrupt(thread_t *);
221extern bool thread_interrupted(thread_t *);
222
223#ifndef thread_create_arch
224extern errno_t thread_create_arch(thread_t *, thread_flags_t);
225#endif
226
227#ifndef thr_constructor_arch
228extern void thr_constructor_arch(thread_t *);
229#endif
230
231#ifndef thr_destructor_arch
232extern void thr_destructor_arch(thread_t *);
233#endif
234
235extern void thread_sleep(uint32_t);
236extern void thread_usleep(uint32_t);
237
238#define thread_join(t) \
239 thread_join_timeout((t), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE)
240
241extern errno_t thread_join_timeout(thread_t *, uint32_t, unsigned int);
242extern void thread_detach(thread_t *);
243
244extern void thread_print_list(bool);
245extern void thread_destroy(thread_t *, bool);
246extern thread_t *thread_find_by_id(thread_id_t);
247extern size_t thread_count(void);
248extern thread_t *thread_first(void);
249extern thread_t *thread_next(thread_t *);
250extern void thread_update_accounting(bool);
251extern bool thread_exists(thread_t *);
252
253extern void thread_migration_disable(void);
254extern void thread_migration_enable(void);
255
256#ifdef CONFIG_UDEBUG
257extern void thread_stack_trace(thread_id_t);
258#endif
259
260/** Fpu context slab cache. */
261extern slab_cache_t *fpu_context_cache;
262
263/* Thread syscall prototypes. */
264extern sys_errno_t sys_thread_create(uspace_ptr_uspace_arg_t, uspace_ptr_char, size_t,
265 uspace_ptr_thread_id_t);
266extern sys_errno_t sys_thread_exit(int);
267extern sys_errno_t sys_thread_get_id(uspace_ptr_thread_id_t);
268extern sys_errno_t sys_thread_usleep(uint32_t);
269extern sys_errno_t sys_thread_udelay(uint32_t);
270
271#endif
272
273/** @}
274 */
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