source: mainline/kernel/generic/include/proc/thread.h@ 0366d09d

ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 0366d09d was 0366d09d, checked in by Jiří Zárevúcky <zarevucky.jiri@…>, 2 years ago

Avoid separate allocation for FPU context

With _Alignas, we can encode alignment in the type itself and
include it directly as a member of thread_t, thus removing
the need for a separate allocation.

The alignment requirement is never more than 16 bytes,
so this adds only minimal extra padding to the structure.
  • 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 ipl_t saved_ipl;
98
99 /**
100 * From here, the stored timeout context
101 * is restored when sleep times out.
102 */
103 context_t sleep_timeout_context;
104
105 /**
106 * From here, the stored interruption context
107 * is restored when sleep is interrupted.
108 */
109 context_t sleep_interruption_context;
110
111 /** If true, the thread can be interrupted from sleep. */
112 bool sleep_interruptible;
113
114 /**
115 * If true, and this thread's sleep returns without a wakeup
116 * (timed out or interrupted), waitq ignores the next wakeup.
117 * This is necessary for futex to be able to handle those conditions.
118 */
119 bool sleep_composable;
120
121 /** Wait queue in which this thread sleeps. */
122 waitq_t *sleep_queue;
123 /** Timeout used for timeoutable sleeping. */
124 timeout_t sleep_timeout;
125 /** Flag signalling sleep timeout in progress. */
126 volatile bool timeout_pending;
127
128 /**
129 * True if this thread is executing copy_from_uspace().
130 * False otherwise.
131 */
132 bool in_copy_from_uspace;
133
134 /**
135 * True if this thread is executing copy_to_uspace().
136 * False otherwise.
137 */
138 bool in_copy_to_uspace;
139
140 /**
141 * If true, the thread will not go to sleep at all and will call
142 * thread_exit() before returning to userspace.
143 */
144 bool interrupted;
145
146 /** If true, thread_join_timeout() cannot be used on this thread. */
147 bool detached;
148 /** Waitq for thread_join_timeout(). */
149 waitq_t join_wq;
150 /** Link used in the joiner_head list. */
151 link_t joiner_link;
152
153#ifdef CONFIG_FPU
154 fpu_context_t fpu_context;
155#endif
156 bool fpu_context_exists;
157
158 /*
159 * Defined only if thread doesn't run.
160 * It means that fpu context is in CPU that last time executes this
161 * thread. This disables migration.
162 */
163 bool fpu_context_engaged;
164
165 /* The thread will not be migrated if nomigrate is non-zero. */
166 unsigned int nomigrate;
167
168 /** Thread state. */
169 state_t state;
170
171 /** Thread CPU. */
172 cpu_t *cpu;
173 /** Containing task. */
174 task_t *task;
175 /** Thread is wired to CPU. */
176 bool wired;
177 /** Thread was migrated to another CPU and has not run yet. */
178 bool stolen;
179 /** Thread is executed in user space. */
180 bool uspace;
181
182 /** Thread accounting. */
183 uint64_t ucycles;
184 uint64_t kcycles;
185 /** Last sampled cycle. */
186 uint64_t last_cycle;
187 /** Thread doesn't affect accumulated accounting. */
188 bool uncounted;
189
190 /** Thread's priority. Implemented as index to CPU->rq */
191 int priority;
192 /** Thread ID. */
193 thread_id_t tid;
194
195 /** Architecture-specific data. */
196 thread_arch_t arch;
197
198 /** Thread's kernel stack. */
199 uint8_t *kstack;
200
201#ifdef CONFIG_UDEBUG
202 /**
203 * If true, the scheduler will print a stack trace
204 * to the kernel console upon scheduling this thread.
205 */
206 bool btrace;
207
208 /** Debugging stuff */
209 udebug_thread_t udebug;
210#endif /* CONFIG_UDEBUG */
211} thread_t;
212
213IRQ_SPINLOCK_EXTERN(threads_lock);
214extern odict_t threads;
215
216extern void thread_init(void);
217extern thread_t *thread_create(void (*)(void *), void *, task_t *,
218 thread_flags_t, const char *);
219extern void thread_wire(thread_t *, cpu_t *);
220extern void thread_attach(thread_t *, task_t *);
221extern void thread_ready(thread_t *);
222extern void thread_exit(void) __attribute__((noreturn));
223extern void thread_interrupt(thread_t *);
224extern bool thread_interrupted(thread_t *);
225
226#ifndef thread_create_arch
227extern errno_t thread_create_arch(thread_t *, thread_flags_t);
228#endif
229
230#ifndef thr_constructor_arch
231extern void thr_constructor_arch(thread_t *);
232#endif
233
234#ifndef thr_destructor_arch
235extern void thr_destructor_arch(thread_t *);
236#endif
237
238extern void thread_sleep(uint32_t);
239extern void thread_usleep(uint32_t);
240
241extern errno_t thread_join(thread_t *);
242extern errno_t thread_join_timeout(thread_t *, uint32_t, unsigned int);
243extern void thread_detach(thread_t *);
244
245extern void thread_print_list(bool);
246extern void thread_destroy(thread_t *, bool);
247extern thread_t *thread_find_by_id(thread_id_t);
248extern size_t thread_count(void);
249extern thread_t *thread_first(void);
250extern thread_t *thread_next(thread_t *);
251extern void thread_update_accounting(bool);
252extern bool thread_exists(thread_t *);
253
254extern void thread_migration_disable(void);
255extern void thread_migration_enable(void);
256
257#ifdef CONFIG_UDEBUG
258extern void thread_stack_trace(thread_id_t);
259#endif
260
261/** Fpu context slab cache. */
262extern slab_cache_t *fpu_context_cache;
263
264/* Thread syscall prototypes. */
265extern sys_errno_t sys_thread_create(uspace_ptr_uspace_arg_t, uspace_ptr_char, size_t,
266 uspace_ptr_thread_id_t);
267extern sys_errno_t sys_thread_exit(int);
268extern sys_errno_t sys_thread_get_id(uspace_ptr_thread_id_t);
269extern sys_errno_t sys_thread_usleep(uint32_t);
270extern sys_errno_t sys_thread_udelay(uint32_t);
271
272#endif
273
274/** @}
275 */
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