| 1 | /*
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| 2 | * Copyright (c) 2001-2007 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 |
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| 29 | /** @addtogroup genericproc
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #ifndef KERN_THREAD_H_
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| 36 | #define KERN_THREAD_H_
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| 37 |
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| 38 | #include <synch/waitq.h>
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| 39 | #include <proc/task.h>
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| 40 | #include <time/timeout.h>
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| 41 | #include <cpu.h>
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| 42 | #include <synch/spinlock.h>
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| 43 | #include <synch/rcu_types.h>
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| 44 | #include <adt/avl.h>
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| 45 | #include <mm/slab.h>
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| 46 | #include <arch/cpu.h>
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| 47 | #include <mm/tlb.h>
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| 48 | #include <abi/proc/uarg.h>
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| 49 | #include <udebug/udebug.h>
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| 50 | #include <abi/sysinfo.h>
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| 51 | #include <arch.h>
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| 52 |
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| 53 |
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| 54 | #define THREAD THE->thread
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| 55 |
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| 56 | #define THREAD_NAME_BUFLEN 20
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| 57 |
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| 58 | extern const char *thread_states[];
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| 59 |
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| 60 | /* Thread flags */
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| 61 | typedef enum {
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| 62 | THREAD_FLAG_NONE = 0,
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| 63 | /** Thread executes in user space. */
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| 64 | THREAD_FLAG_USPACE = (1 << 0),
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| 65 | /** Thread will be attached by the caller. */
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| 66 | THREAD_FLAG_NOATTACH = (1 << 1),
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| 67 | /** Thread accounting doesn't affect accumulated task accounting. */
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| 68 | THREAD_FLAG_UNCOUNTED = (1 << 2)
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| 69 | } thread_flags_t;
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| 70 |
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| 71 | /** Thread structure. There is one per thread. */
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| 72 | typedef struct thread {
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| 73 | link_t rq_link; /**< Run queue link. */
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| 74 | link_t wq_link; /**< Wait queue link. */
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| 75 | link_t th_link; /**< Links to threads within containing task. */
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| 76 |
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| 77 | /** Threads linkage to the threads_tree. */
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| 78 | avltree_node_t threads_tree_node;
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| 79 |
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| 80 | /** Lock protecting thread structure.
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| 81 | *
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| 82 | * Protects the whole thread structure except list links above.
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| 83 | */
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| 84 | IRQ_SPINLOCK_DECLARE(lock);
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| 85 |
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| 86 | char name[THREAD_NAME_BUFLEN];
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| 87 |
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| 88 | /** Function implementing the thread. */
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| 89 | void (*thread_code)(void *);
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| 90 | /** Argument passed to thread_code() function. */
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| 91 | void *thread_arg;
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| 92 |
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| 93 | /**
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| 94 | * From here, the stored context is restored
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| 95 | * when the thread is scheduled.
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| 96 | */
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| 97 | context_t saved_context;
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| 98 |
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| 99 | /**
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| 100 | * From here, the stored timeout context
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| 101 | * is restored when sleep times out.
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| 102 | */
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| 103 | context_t sleep_timeout_context;
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| 104 |
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| 105 | /**
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| 106 | * From here, the stored interruption context
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| 107 | * is restored when sleep is interrupted.
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| 108 | */
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| 109 | context_t sleep_interruption_context;
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| 110 |
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| 111 | /** If true, the thread can be interrupted from sleep. */
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| 112 | bool sleep_interruptible;
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| 113 | /** Wait queue in which this thread sleeps. */
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| 114 | waitq_t *sleep_queue;
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| 115 | /** Timeout used for timeoutable sleeping. */
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| 116 | timeout_t sleep_timeout;
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| 117 | /** Flag signalling sleep timeout in progress. */
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| 118 | volatile bool timeout_pending;
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| 119 |
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| 120 | /**
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| 121 | * True if this thread is executing copy_from_uspace().
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| 122 | * False otherwise.
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| 123 | */
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| 124 | bool in_copy_from_uspace;
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| 125 |
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| 126 | /**
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| 127 | * True if this thread is executing copy_to_uspace().
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| 128 | * False otherwise.
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| 129 | */
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| 130 | bool in_copy_to_uspace;
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| 131 |
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| 132 | /**
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| 133 | * If true, the thread will not go to sleep at all and will call
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| 134 | * thread_exit() before returning to userspace.
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| 135 | */
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| 136 | bool interrupted;
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| 137 |
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| 138 | /** If true, thread_join_timeout() cannot be used on this thread. */
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| 139 | bool detached;
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| 140 | /** Waitq for thread_join_timeout(). */
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| 141 | waitq_t join_wq;
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| 142 | /** Link used in the joiner_head list. */
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| 143 | link_t joiner_link;
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| 144 |
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| 145 | fpu_context_t *saved_fpu_context;
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| 146 | bool fpu_context_exists;
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| 147 |
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| 148 | /*
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| 149 | * Defined only if thread doesn't run.
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| 150 | * It means that fpu context is in CPU that last time executes this
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| 151 | * thread. This disables migration.
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| 152 | */
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| 153 | bool fpu_context_engaged;
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| 154 |
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| 155 | /* The thread will not be migrated if nomigrate is non-zero. */
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| 156 | unsigned int nomigrate;
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| 157 |
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| 158 | /** Thread state. */
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| 159 | state_t state;
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| 160 |
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| 161 | /** Thread CPU. */
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| 162 | cpu_t *cpu;
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| 163 | /** Containing task. */
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| 164 | task_t *task;
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| 165 | /** Thread is wired to CPU. */
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| 166 | bool wired;
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| 167 | /** Thread was migrated to another CPU and has not run yet. */
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| 168 | bool stolen;
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| 169 | /** Thread is executed in user space. */
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| 170 | bool uspace;
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| 171 |
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| 172 | /** Ticks before preemption. */
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| 173 | uint64_t ticks;
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| 174 |
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| 175 | /** Thread accounting. */
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| 176 | uint64_t ucycles;
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| 177 | uint64_t kcycles;
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| 178 | /** Last sampled cycle. */
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| 179 | uint64_t last_cycle;
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| 180 | /** Thread doesn't affect accumulated accounting. */
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| 181 | bool uncounted;
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| 182 |
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| 183 | /** Thread's priority. Implemented as index to CPU->rq */
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| 184 | int priority;
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| 185 | /** Thread ID. */
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| 186 | thread_id_t tid;
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| 187 |
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| 188 | /** Work queue this thread belongs to or NULL. Immutable. */
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| 189 | struct work_queue *workq;
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| 190 | /** Links work queue threads. Protected by workq->lock. */
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| 191 | link_t workq_link;
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| 192 | /** True if the worker was blocked and is not running. Use thread->lock. */
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| 193 | bool workq_blocked;
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| 194 | /** True if the worker will block in order to become idle. Use workq->lock. */
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| 195 | bool workq_idling;
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| 196 |
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| 197 | /** RCU thread related data. Protected by its own locks. */
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| 198 | rcu_thread_data_t rcu;
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| 199 |
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| 200 | /** Architecture-specific data. */
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| 201 | thread_arch_t arch;
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| 202 |
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| 203 | /** Thread's kernel stack. */
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| 204 | uint8_t *kstack;
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| 205 |
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| 206 | #ifdef CONFIG_UDEBUG
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| 207 | /**
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| 208 | * If true, the scheduler will print a stack trace
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| 209 | * to the kernel console upon scheduling this thread.
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| 210 | */
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| 211 | bool btrace;
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| 212 |
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| 213 | /** Debugging stuff */
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| 214 | udebug_thread_t udebug;
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| 215 | #endif /* CONFIG_UDEBUG */
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| 216 | } thread_t;
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| 217 |
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| 218 | /** Thread list lock.
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| 219 | *
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| 220 | * This lock protects the threads_tree.
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| 221 | * Must be acquired before T.lock for each T of type thread_t.
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| 222 | *
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| 223 | */
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| 224 | IRQ_SPINLOCK_EXTERN(threads_lock);
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| 225 |
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| 226 | /** AVL tree containing all threads. */
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| 227 | extern avltree_t threads_tree;
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| 228 |
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| 229 | extern void thread_init(void);
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| 230 | extern thread_t *thread_create(void (*)(void *), void *, task_t *,
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| 231 | thread_flags_t, const char *);
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| 232 | extern void thread_wire(thread_t *, cpu_t *);
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| 233 | extern void thread_attach(thread_t *, task_t *);
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| 234 | extern void thread_ready(thread_t *);
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| 235 | extern void thread_exit(void) __attribute__((noreturn));
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| 236 | extern void thread_interrupt(thread_t *);
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| 237 | extern bool thread_interrupted(thread_t *);
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| 238 |
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| 239 | #ifndef thread_create_arch
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| 240 | extern void thread_create_arch(thread_t *);
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| 241 | #endif
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| 242 |
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| 243 | #ifndef thr_constructor_arch
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| 244 | extern void thr_constructor_arch(thread_t *);
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| 245 | #endif
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| 246 |
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| 247 | #ifndef thr_destructor_arch
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| 248 | extern void thr_destructor_arch(thread_t *);
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| 249 | #endif
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| 250 |
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| 251 | extern void thread_sleep(uint32_t);
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| 252 | extern void thread_usleep(uint32_t);
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| 253 |
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| 254 | #define thread_join(t) \
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| 255 | thread_join_timeout((t), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE)
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| 256 |
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| 257 | extern int thread_join_timeout(thread_t *, uint32_t, unsigned int);
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| 258 | extern void thread_detach(thread_t *);
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| 259 |
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| 260 | extern void thread_print_list(bool);
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| 261 | extern void thread_destroy(thread_t *, bool);
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| 262 | extern thread_t *thread_find_by_id(thread_id_t);
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| 263 | extern void thread_update_accounting(bool);
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| 264 | extern bool thread_exists(thread_t *);
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| 265 |
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| 266 | extern void thread_migration_disable(void);
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| 267 | extern void thread_migration_enable(void);
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| 268 |
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| 269 | #ifdef CONFIG_UDEBUG
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| 270 | extern void thread_stack_trace(thread_id_t);
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| 271 | #endif
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| 272 |
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| 273 | /** Fpu context slab cache. */
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| 274 | extern slab_cache_t *fpu_context_slab;
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| 275 |
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| 276 | /* Thread syscall prototypes. */
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| 277 | extern sysarg_t sys_thread_create(uspace_arg_t *, char *, size_t,
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| 278 | thread_id_t *);
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| 279 | extern sysarg_t sys_thread_exit(int);
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| 280 | extern sysarg_t sys_thread_get_id(thread_id_t *);
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| 281 | extern sysarg_t sys_thread_usleep(uint32_t);
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| 282 | extern sysarg_t sys_thread_udelay(uint32_t);
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| 283 |
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| 284 | #endif
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| 285 |
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| 286 | /** @}
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| 287 | */
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