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Rev | Author | Line No. | Line |
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1 | jermar | 1 | /* |
2071 | jermar | 2 | * Copyright (c) 2001-2004 Jakub Jermar |
1 | jermar | 3 | * All rights reserved. |
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 | |||
1757 | jermar | 29 | /** @addtogroup genericproc |
1702 | cejka | 30 | * @{ |
31 | */ |
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32 | |||
1248 | jermar | 33 | /** |
1702 | cejka | 34 | * @file |
1248 | jermar | 35 | * @brief Thread management functions. |
36 | */ |
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37 | |||
1 | jermar | 38 | #include <proc/scheduler.h> |
39 | #include <proc/thread.h> |
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40 | #include <proc/task.h> |
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1078 | jermar | 41 | #include <proc/uarg.h> |
1 | jermar | 42 | #include <mm/frame.h> |
43 | #include <mm/page.h> |
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44 | #include <arch/asm.h> |
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2030 | decky | 45 | #include <arch/cycle.h> |
1 | jermar | 46 | #include <arch.h> |
47 | #include <synch/synch.h> |
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48 | #include <synch/spinlock.h> |
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49 | #include <synch/waitq.h> |
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50 | #include <synch/rwlock.h> |
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51 | #include <cpu.h> |
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52 | #include <func.h> |
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53 | #include <context.h> |
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2502 | jermar | 54 | #include <adt/avl.h> |
788 | jermar | 55 | #include <adt/list.h> |
1 | jermar | 56 | #include <time/clock.h> |
2089 | decky | 57 | #include <time/timeout.h> |
7 | jermar | 58 | #include <config.h> |
59 | #include <arch/interrupt.h> |
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10 | jermar | 60 | #include <smp/ipi.h> |
76 | jermar | 61 | #include <arch/faddr.h> |
1104 | jermar | 62 | #include <atomic.h> |
195 | vana | 63 | #include <memstr.h> |
777 | palkovsky | 64 | #include <print.h> |
787 | palkovsky | 65 | #include <mm/slab.h> |
66 | #include <debug.h> |
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1066 | jermar | 67 | #include <main/uinit.h> |
1288 | jermar | 68 | #include <syscall/copy.h> |
69 | #include <errno.h> |
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2446 | jermar | 70 | #include <console/klog.h> |
7 | jermar | 71 | |
1 | jermar | 72 | |
1571 | jermar | 73 | /** Thread states */ |
74 | char *thread_states[] = { |
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75 | "Invalid", |
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76 | "Running", |
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77 | "Sleeping", |
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78 | "Ready", |
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79 | "Entering", |
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80 | "Exiting", |
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2451 | jermar | 81 | "Lingering" |
1571 | jermar | 82 | }; |
83 | |||
2502 | jermar | 84 | /** Lock protecting the threads_tree AVL tree. |
2067 | jermar | 85 | * |
86 | * For locking rules, see declaration thereof. |
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87 | */ |
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1158 | jermar | 88 | SPINLOCK_INITIALIZE(threads_lock); |
1 | jermar | 89 | |
2925 | svoboda | 90 | /** AVL tree of all threads. |
1636 | jermar | 91 | * |
2502 | jermar | 92 | * When a thread is found in the threads_tree AVL tree, it is guaranteed to |
2067 | jermar | 93 | * exist as long as the threads_lock is held. |
1636 | jermar | 94 | */ |
2502 | jermar | 95 | avltree_t threads_tree; |
1636 | jermar | 96 | |
623 | jermar | 97 | SPINLOCK_INITIALIZE(tidlock); |
2216 | decky | 98 | thread_id_t last_tid = 0; |
1 | jermar | 99 | |
787 | palkovsky | 100 | static slab_cache_t *thread_slab; |
906 | palkovsky | 101 | #ifdef ARCH_HAS_FPU |
102 | slab_cache_t *fpu_context_slab; |
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103 | #endif |
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107 | decky | 104 | |
2067 | jermar | 105 | /** Thread wrapper. |
107 | decky | 106 | * |
2067 | jermar | 107 | * This wrapper is provided to ensure that every thread makes a call to |
108 | * thread_exit() when its implementing function returns. |
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1 | jermar | 109 | * |
413 | jermar | 110 | * interrupts_disable() is assumed. |
107 | decky | 111 | * |
1 | jermar | 112 | */ |
452 | decky | 113 | static void cushion(void) |
1 | jermar | 114 | { |
15 | jermar | 115 | void (*f)(void *) = THREAD->thread_code; |
116 | void *arg = THREAD->thread_arg; |
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2032 | decky | 117 | THREAD->last_cycle = get_cycle(); |
1 | jermar | 118 | |
2039 | decky | 119 | /* This is where each thread wakes up after its creation */ |
15 | jermar | 120 | spinlock_unlock(&THREAD->lock); |
413 | jermar | 121 | interrupts_enable(); |
1 | jermar | 122 | |
123 | f(arg); |
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2039 | decky | 124 | |
125 | /* Accumulate accounting to the task */ |
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126 | ipl_t ipl = interrupts_disable(); |
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127 | |||
128 | spinlock_lock(&THREAD->lock); |
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2042 | decky | 129 | if (!THREAD->uncounted) { |
130 | thread_update_accounting(); |
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131 | uint64_t cycles = THREAD->cycles; |
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132 | THREAD->cycles = 0; |
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133 | spinlock_unlock(&THREAD->lock); |
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134 | |||
135 | spinlock_lock(&TASK->lock); |
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136 | TASK->cycles += cycles; |
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137 | spinlock_unlock(&TASK->lock); |
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138 | } else |
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139 | spinlock_unlock(&THREAD->lock); |
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2039 | decky | 140 | |
141 | interrupts_restore(ipl); |
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142 | |||
1 | jermar | 143 | thread_exit(); |
144 | /* not reached */ |
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145 | } |
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146 | |||
787 | palkovsky | 147 | /** Initialization and allocation for thread_t structure */ |
148 | static int thr_constructor(void *obj, int kmflags) |
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149 | { |
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1820 | decky | 150 | thread_t *t = (thread_t *) obj; |
107 | decky | 151 | |
787 | palkovsky | 152 | spinlock_initialize(&t->lock, "thread_t_lock"); |
153 | link_initialize(&t->rq_link); |
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154 | link_initialize(&t->wq_link); |
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155 | link_initialize(&t->th_link); |
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1854 | jermar | 156 | |
157 | /* call the architecture-specific part of the constructor */ |
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158 | thr_constructor_arch(t); |
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787 | palkovsky | 159 | |
906 | palkovsky | 160 | #ifdef ARCH_HAS_FPU |
2440 | jermar | 161 | #ifdef CONFIG_FPU_LAZY |
906 | palkovsky | 162 | t->saved_fpu_context = NULL; |
2440 | jermar | 163 | #else |
164 | t->saved_fpu_context = slab_alloc(fpu_context_slab, kmflags); |
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906 | palkovsky | 165 | if (!t->saved_fpu_context) |
166 | return -1; |
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2440 | jermar | 167 | #endif |
906 | palkovsky | 168 | #endif |
169 | |||
2118 | decky | 170 | t->kstack = (uint8_t *) frame_alloc(STACK_FRAMES, FRAME_KA | kmflags); |
2440 | jermar | 171 | if (!t->kstack) { |
906 | palkovsky | 172 | #ifdef ARCH_HAS_FPU |
173 | if (t->saved_fpu_context) |
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2440 | jermar | 174 | slab_free(fpu_context_slab, t->saved_fpu_context); |
906 | palkovsky | 175 | #endif |
842 | palkovsky | 176 | return -1; |
906 | palkovsky | 177 | } |
787 | palkovsky | 178 | |
2848 | svoboda | 179 | spinlock_initialize(&t->debug_lock, "thread_debug_lock"); |
180 | |||
787 | palkovsky | 181 | return 0; |
182 | } |
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183 | |||
184 | /** Destruction of thread_t object */ |
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185 | static int thr_destructor(void *obj) |
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186 | { |
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1820 | decky | 187 | thread_t *t = (thread_t *) obj; |
787 | palkovsky | 188 | |
1854 | jermar | 189 | /* call the architecture-specific part of the destructor */ |
190 | thr_destructor_arch(t); |
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191 | |||
1760 | palkovsky | 192 | frame_free(KA2PA(t->kstack)); |
906 | palkovsky | 193 | #ifdef ARCH_HAS_FPU |
194 | if (t->saved_fpu_context) |
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2440 | jermar | 195 | slab_free(fpu_context_slab, t->saved_fpu_context); |
906 | palkovsky | 196 | #endif |
787 | palkovsky | 197 | return 1; /* One page freed */ |
198 | } |
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199 | |||
107 | decky | 200 | /** Initialize threads |
201 | * |
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202 | * Initialize kernel threads support. |
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203 | * |
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204 | */ |
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1 | jermar | 205 | void thread_init(void) |
206 | { |
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15 | jermar | 207 | THREAD = NULL; |
625 | palkovsky | 208 | atomic_set(&nrdy,0); |
2067 | jermar | 209 | thread_slab = slab_cache_create("thread_slab", sizeof(thread_t), 0, |
2087 | jermar | 210 | thr_constructor, thr_destructor, 0); |
2067 | jermar | 211 | |
906 | palkovsky | 212 | #ifdef ARCH_HAS_FPU |
2067 | jermar | 213 | fpu_context_slab = slab_cache_create("fpu_slab", sizeof(fpu_context_t), |
2087 | jermar | 214 | FPU_CONTEXT_ALIGN, NULL, NULL, 0); |
906 | palkovsky | 215 | #endif |
1158 | jermar | 216 | |
2502 | jermar | 217 | avltree_create(&threads_tree); |
1 | jermar | 218 | } |
219 | |||
107 | decky | 220 | /** Make thread ready |
221 | * |
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222 | * Switch thread t to the ready state. |
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223 | * |
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224 | * @param t Thread to make ready. |
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225 | * |
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226 | */ |
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1 | jermar | 227 | void thread_ready(thread_t *t) |
228 | { |
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229 | cpu_t *cpu; |
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230 | runq_t *r; |
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413 | jermar | 231 | ipl_t ipl; |
625 | palkovsky | 232 | int i, avg; |
1 | jermar | 233 | |
413 | jermar | 234 | ipl = interrupts_disable(); |
1 | jermar | 235 | |
236 | spinlock_lock(&t->lock); |
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237 | |||
2440 | jermar | 238 | ASSERT(!(t->state == Ready)); |
1086 | palkovsky | 239 | |
2067 | jermar | 240 | i = (t->priority < RQ_COUNT - 1) ? ++t->priority : t->priority; |
1 | jermar | 241 | |
16 | jermar | 242 | cpu = CPU; |
1854 | jermar | 243 | if (t->flags & THREAD_FLAG_WIRED) { |
2268 | jermar | 244 | ASSERT(t->cpu != NULL); |
1 | jermar | 245 | cpu = t->cpu; |
246 | } |
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1083 | palkovsky | 247 | t->state = Ready; |
1 | jermar | 248 | spinlock_unlock(&t->lock); |
249 | |||
107 | decky | 250 | /* |
1 | jermar | 251 | * Append t to respective ready queue on respective processor. |
252 | */ |
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253 | r = &cpu->rq[i]; |
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254 | spinlock_lock(&r->lock); |
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255 | list_append(&t->rq_link, &r->rq_head); |
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256 | r->n++; |
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257 | spinlock_unlock(&r->lock); |
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258 | |||
475 | jermar | 259 | atomic_inc(&nrdy); |
625 | palkovsky | 260 | avg = atomic_get(&nrdy) / config.cpu_active; |
783 | palkovsky | 261 | atomic_inc(&cpu->nrdy); |
1 | jermar | 262 | |
413 | jermar | 263 | interrupts_restore(ipl); |
1 | jermar | 264 | } |
265 | |||
107 | decky | 266 | /** Create new thread |
267 | * |
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268 | * Create a new thread. |
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269 | * |
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2925 | svoboda | 270 | * @param func Thread's implementing function. |
271 | * @param arg Thread's implementing function argument. |
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272 | * @param task Task to which the thread belongs. The caller must |
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273 | * guarantee that the task won't cease to exist during the |
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274 | * call. The task's lock may not be held. |
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275 | * @param flags Thread flags. |
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276 | * @param name Symbolic name. |
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277 | * @param uncounted Thread's accounting doesn't affect accumulated task |
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278 | * accounting. |
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107 | decky | 279 | * |
2925 | svoboda | 280 | * @return New thread's structure on success, NULL on failure. |
107 | decky | 281 | * |
282 | */ |
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2067 | jermar | 283 | thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, |
2436 | jermar | 284 | int flags, char *name, bool uncounted) |
1 | jermar | 285 | { |
286 | thread_t *t; |
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822 | palkovsky | 287 | ipl_t ipl; |
288 | |||
787 | palkovsky | 289 | t = (thread_t *) slab_alloc(thread_slab, 0); |
842 | palkovsky | 290 | if (!t) |
291 | return NULL; |
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1 | jermar | 292 | |
822 | palkovsky | 293 | /* Not needed, but good for debugging */ |
2067 | jermar | 294 | memsetb((uintptr_t) t->kstack, THREAD_STACK_SIZE * 1 << STACK_FRAMES, |
2087 | jermar | 295 | 0); |
822 | palkovsky | 296 | |
297 | ipl = interrupts_disable(); |
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298 | spinlock_lock(&tidlock); |
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299 | t->tid = ++last_tid; |
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300 | spinlock_unlock(&tidlock); |
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301 | interrupts_restore(ipl); |
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302 | |||
303 | context_save(&t->saved_context); |
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2067 | jermar | 304 | context_set(&t->saved_context, FADDR(cushion), (uintptr_t) t->kstack, |
2087 | jermar | 305 | THREAD_STACK_SIZE); |
822 | palkovsky | 306 | |
307 | the_initialize((the_t *) t->kstack); |
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308 | |||
309 | ipl = interrupts_disable(); |
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310 | t->saved_context.ipl = interrupts_read(); |
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311 | interrupts_restore(ipl); |
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312 | |||
1066 | jermar | 313 | memcpy(t->name, name, THREAD_NAME_BUFLEN); |
314 | |||
822 | palkovsky | 315 | t->thread_code = func; |
316 | t->thread_arg = arg; |
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317 | t->ticks = -1; |
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2030 | decky | 318 | t->cycles = 0; |
2042 | decky | 319 | t->uncounted = uncounted; |
822 | palkovsky | 320 | t->priority = -1; /* start in rq[0] */ |
321 | t->cpu = NULL; |
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1854 | jermar | 322 | t->flags = flags; |
822 | palkovsky | 323 | t->state = Entering; |
324 | t->call_me = NULL; |
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325 | t->call_me_with = NULL; |
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326 | |||
327 | timeout_initialize(&t->sleep_timeout); |
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1502 | jermar | 328 | t->sleep_interruptible = false; |
822 | palkovsky | 329 | t->sleep_queue = NULL; |
330 | t->timeout_pending = 0; |
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1288 | jermar | 331 | |
332 | t->in_copy_from_uspace = false; |
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333 | t->in_copy_to_uspace = false; |
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1579 | jermar | 334 | |
335 | t->interrupted = false; |
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1571 | jermar | 336 | t->detached = false; |
337 | waitq_initialize(&t->join_wq); |
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338 | |||
822 | palkovsky | 339 | t->rwlock_holder_type = RWLOCK_NONE; |
210 | decky | 340 | |
822 | palkovsky | 341 | t->task = task; |
342 | |||
860 | decky | 343 | t->fpu_context_exists = 0; |
344 | t->fpu_context_engaged = 0; |
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1854 | jermar | 345 | |
2502 | jermar | 346 | avltree_node_initialize(&t->threads_tree_node); |
347 | t->threads_tree_node.key = (uintptr_t) t; |
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2801 | svoboda | 348 | |
2817 | svoboda | 349 | /* Init debugging stuff */ |
2801 | svoboda | 350 | waitq_initialize(&t->go_wq); |
2826 | svoboda | 351 | t->debug_go_call = NULL; |
2817 | svoboda | 352 | t->uspace_state = NULL; |
2825 | svoboda | 353 | t->debug_stop = true; |
2898 | svoboda | 354 | t->debug_stoppable = true; |
2827 | svoboda | 355 | t->debug_active = false; |
2866 | svoboda | 356 | t->cur_event = 0; /* none */ |
2502 | jermar | 357 | |
2067 | jermar | 358 | /* might depend on previous initialization */ |
2799 | svoboda | 359 | thread_create_arch(t); |
2440 | jermar | 360 | |
361 | if (!(flags & THREAD_FLAG_NOATTACH)) |
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362 | thread_attach(t, task); |
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363 | |||
364 | return t; |
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365 | } |
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366 | |||
2839 | svoboda | 367 | /** Destroy thread structure of an unattached thread. |
368 | * |
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369 | * Thread t must only have been created and never attached. |
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370 | */ |
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371 | void thread_unattached_free(thread_t *t) |
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372 | { |
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373 | slab_free(thread_slab, t); |
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374 | } |
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375 | |||
376 | |||
2440 | jermar | 377 | /** Destroy thread memory structure |
378 | * |
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379 | * Detach thread from all queues, cpus etc. and destroy it. |
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380 | * |
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381 | * Assume thread->lock is held!! |
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382 | */ |
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383 | void thread_destroy(thread_t *t) |
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384 | { |
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2451 | jermar | 385 | ASSERT(t->state == Exiting || t->state == Lingering); |
2440 | jermar | 386 | ASSERT(t->task); |
387 | ASSERT(t->cpu); |
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388 | |||
389 | spinlock_lock(&t->cpu->lock); |
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390 | if (t->cpu->fpu_owner == t) |
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391 | t->cpu->fpu_owner = NULL; |
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392 | spinlock_unlock(&t->cpu->lock); |
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393 | |||
394 | spinlock_unlock(&t->lock); |
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395 | |||
396 | spinlock_lock(&threads_lock); |
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2502 | jermar | 397 | avltree_delete(&threads_tree, &t->threads_tree_node); |
2440 | jermar | 398 | spinlock_unlock(&threads_lock); |
399 | |||
400 | /* |
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401 | * Detach from the containing task. |
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402 | */ |
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403 | spinlock_lock(&t->task->lock); |
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404 | list_remove(&t->th_link); |
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405 | spinlock_unlock(&t->task->lock); |
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2446 | jermar | 406 | |
407 | /* |
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408 | * t is guaranteed to be the very last thread of its task. |
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409 | * It is safe to destroy the task. |
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410 | */ |
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411 | if (atomic_predec(&t->task->refcount) == 0) |
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2440 | jermar | 412 | task_destroy(t->task); |
413 | |||
414 | slab_free(thread_slab, t); |
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415 | } |
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416 | |||
417 | /** Make the thread visible to the system. |
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418 | * |
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419 | * Attach the thread structure to the current task and make it visible in the |
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2502 | jermar | 420 | * threads_tree. |
2440 | jermar | 421 | * |
422 | * @param t Thread to be attached to the task. |
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423 | * @param task Task to which the thread is to be attached. |
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424 | */ |
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425 | void thread_attach(thread_t *t, task_t *task) |
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426 | { |
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427 | ipl_t ipl; |
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428 | |||
429 | /* |
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2902 | svoboda | 430 | * Attach to the specified task. |
2440 | jermar | 431 | */ |
2446 | jermar | 432 | ipl = interrupts_disable(); |
2440 | jermar | 433 | spinlock_lock(&task->lock); |
2902 | svoboda | 434 | atomic_inc(&task->refcount); |
435 | /* Must not count kbox thread into lifecount */ |
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436 | if (t->flags & THREAD_FLAG_USPACE) |
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437 | atomic_inc(&task->lifecount); |
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438 | list_append(&t->th_link, &task->th_head); |
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1579 | jermar | 439 | spinlock_unlock(&task->lock); |
440 | |||
441 | /* |
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822 | palkovsky | 442 | * Register this thread in the system-wide list. |
443 | */ |
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2902 | svoboda | 444 | spinlock_lock(&threads_lock); |
445 | avltree_insert(&threads_tree, &t->threads_tree_node); |
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446 | spinlock_unlock(&threads_lock); |
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822 | palkovsky | 447 | |
448 | interrupts_restore(ipl); |
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1 | jermar | 449 | } |
450 | |||
1687 | jermar | 451 | /** Terminate thread. |
107 | decky | 452 | * |
2067 | jermar | 453 | * End current thread execution and switch it to the exiting state. All pending |
454 | * timeouts are executed. |
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107 | decky | 455 | */ |
1 | jermar | 456 | void thread_exit(void) |
457 | { |
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413 | jermar | 458 | ipl_t ipl; |
1 | jermar | 459 | |
2902 | svoboda | 460 | if (THREAD->flags & THREAD_FLAG_USPACE) { |
2903 | svoboda | 461 | /* Generate udebug THREAD_E event */ |
462 | udebug_thread_e_event(); |
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463 | |||
2902 | svoboda | 464 | if (atomic_predec(&TASK->lifecount) == 0) { |
465 | /* |
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466 | * We are the last userspace thread in the task that |
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467 | * still has not exited. With the exception of the |
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468 | * moment the task was created, new userspace threads |
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469 | * can only be created by threads of the same task. |
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470 | * We are safe to perform cleanup. |
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471 | */ |
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2446 | jermar | 472 | ipc_cleanup(); |
2902 | svoboda | 473 | futex_cleanup(); |
2446 | jermar | 474 | klog_printf("Cleanup of task %llu completed.", |
475 | TASK->taskid); |
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476 | } |
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477 | } |
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478 | |||
1 | jermar | 479 | restart: |
413 | jermar | 480 | ipl = interrupts_disable(); |
15 | jermar | 481 | spinlock_lock(&THREAD->lock); |
2067 | jermar | 482 | if (THREAD->timeout_pending) { |
483 | /* busy waiting for timeouts in progress */ |
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15 | jermar | 484 | spinlock_unlock(&THREAD->lock); |
413 | jermar | 485 | interrupts_restore(ipl); |
1 | jermar | 486 | goto restart; |
487 | } |
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2446 | jermar | 488 | |
15 | jermar | 489 | THREAD->state = Exiting; |
490 | spinlock_unlock(&THREAD->lock); |
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1 | jermar | 491 | scheduler(); |
1595 | palkovsky | 492 | |
493 | /* Not reached */ |
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494 | while (1) |
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495 | ; |
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1 | jermar | 496 | } |
497 | |||
107 | decky | 498 | |
499 | /** Thread sleep |
||
500 | * |
||
501 | * Suspend execution of the current thread. |
||
502 | * |
||
503 | * @param sec Number of seconds to sleep. |
||
504 | * |
||
505 | */ |
||
1780 | jermar | 506 | void thread_sleep(uint32_t sec) |
1 | jermar | 507 | { |
2067 | jermar | 508 | thread_usleep(sec * 1000000); |
1 | jermar | 509 | } |
107 | decky | 510 | |
1571 | jermar | 511 | /** Wait for another thread to exit. |
512 | * |
||
513 | * @param t Thread to join on exit. |
||
514 | * @param usec Timeout in microseconds. |
||
515 | * @param flags Mode of operation. |
||
516 | * |
||
517 | * @return An error code from errno.h or an error code from synch.h. |
||
518 | */ |
||
1780 | jermar | 519 | int thread_join_timeout(thread_t *t, uint32_t usec, int flags) |
1571 | jermar | 520 | { |
521 | ipl_t ipl; |
||
522 | int rc; |
||
523 | |||
524 | if (t == THREAD) |
||
525 | return EINVAL; |
||
526 | |||
527 | /* |
||
528 | * Since thread join can only be called once on an undetached thread, |
||
529 | * the thread pointer is guaranteed to be still valid. |
||
530 | */ |
||
531 | |||
532 | ipl = interrupts_disable(); |
||
533 | spinlock_lock(&t->lock); |
||
534 | ASSERT(!t->detached); |
||
535 | spinlock_unlock(&t->lock); |
||
1687 | jermar | 536 | interrupts_restore(ipl); |
1571 | jermar | 537 | |
1687 | jermar | 538 | rc = waitq_sleep_timeout(&t->join_wq, usec, flags); |
1571 | jermar | 539 | |
540 | return rc; |
||
541 | } |
||
542 | |||
543 | /** Detach thread. |
||
544 | * |
||
2451 | jermar | 545 | * Mark the thread as detached, if the thread is already in the Lingering |
546 | * state, deallocate its resources. |
||
1571 | jermar | 547 | * |
548 | * @param t Thread to be detached. |
||
549 | */ |
||
550 | void thread_detach(thread_t *t) |
||
551 | { |
||
552 | ipl_t ipl; |
||
553 | |||
554 | /* |
||
2183 | jermar | 555 | * Since the thread is expected not to be already detached, |
1571 | jermar | 556 | * pointer to it must be still valid. |
557 | */ |
||
558 | ipl = interrupts_disable(); |
||
559 | spinlock_lock(&t->lock); |
||
560 | ASSERT(!t->detached); |
||
2451 | jermar | 561 | if (t->state == Lingering) { |
1571 | jermar | 562 | thread_destroy(t); /* unlocks &t->lock */ |
563 | interrupts_restore(ipl); |
||
564 | return; |
||
565 | } else { |
||
566 | t->detached = true; |
||
567 | } |
||
568 | spinlock_unlock(&t->lock); |
||
569 | interrupts_restore(ipl); |
||
570 | } |
||
571 | |||
107 | decky | 572 | /** Thread usleep |
573 | * |
||
574 | * Suspend execution of the current thread. |
||
575 | * |
||
576 | * @param usec Number of microseconds to sleep. |
||
577 | * |
||
578 | */ |
||
1780 | jermar | 579 | void thread_usleep(uint32_t usec) |
1 | jermar | 580 | { |
581 | waitq_t wq; |
||
582 | |||
583 | waitq_initialize(&wq); |
||
584 | |||
1502 | jermar | 585 | (void) waitq_sleep_timeout(&wq, usec, SYNCH_FLAGS_NON_BLOCKING); |
1 | jermar | 586 | } |
587 | |||
107 | decky | 588 | /** Register thread out-of-context invocation |
589 | * |
||
590 | * Register a function and its argument to be executed |
||
591 | * on next context switch to the current thread. |
||
592 | * |
||
593 | * @param call_me Out-of-context function. |
||
594 | * @param call_me_with Out-of-context function argument. |
||
595 | * |
||
596 | */ |
||
1 | jermar | 597 | void thread_register_call_me(void (* call_me)(void *), void *call_me_with) |
598 | { |
||
413 | jermar | 599 | ipl_t ipl; |
1 | jermar | 600 | |
413 | jermar | 601 | ipl = interrupts_disable(); |
15 | jermar | 602 | spinlock_lock(&THREAD->lock); |
603 | THREAD->call_me = call_me; |
||
604 | THREAD->call_me_with = call_me_with; |
||
605 | spinlock_unlock(&THREAD->lock); |
||
413 | jermar | 606 | interrupts_restore(ipl); |
1 | jermar | 607 | } |
777 | palkovsky | 608 | |
2504 | jermar | 609 | static bool thread_walker(avltree_node_t *node, void *arg) |
2502 | jermar | 610 | { |
611 | thread_t *t; |
||
612 | |||
613 | t = avltree_get_instance(node, thread_t, threads_tree_node); |
||
614 | |||
615 | uint64_t cycles; |
||
616 | char suffix; |
||
617 | order(t->cycles, &cycles, &suffix); |
||
2712 | decky | 618 | |
619 | if (sizeof(void *) == 4) |
||
620 | printf("%-6llu %-10s %#10zx %-8s %#10zx %-3ld %#10zx %#10zx %9llu%c ", |
||
621 | t->tid, t->name, t, thread_states[t->state], t->task, |
||
622 | t->task->context, t->thread_code, t->kstack, cycles, suffix); |
||
623 | else |
||
624 | printf("%-6llu %-10s %#18zx %-8s %#18zx %-3ld %#18zx %#18zx %9llu%c ", |
||
625 | t->tid, t->name, t, thread_states[t->state], t->task, |
||
626 | t->task->context, t->thread_code, t->kstack, cycles, suffix); |
||
2502 | jermar | 627 | |
628 | if (t->cpu) |
||
629 | printf("%-4zd", t->cpu->id); |
||
630 | else |
||
631 | printf("none"); |
||
632 | |||
2712 | decky | 633 | if (t->state == Sleeping) { |
634 | if (sizeof(uintptr_t) == 4) |
||
635 | printf(" %#10zx", t->sleep_queue); |
||
636 | else |
||
637 | printf(" %#18zx", t->sleep_queue); |
||
638 | } |
||
2502 | jermar | 639 | |
640 | printf("\n"); |
||
2504 | jermar | 641 | |
642 | return true; |
||
2502 | jermar | 643 | } |
644 | |||
777 | palkovsky | 645 | /** Print list of threads debug info */ |
646 | void thread_print_list(void) |
||
647 | { |
||
648 | ipl_t ipl; |
||
649 | |||
650 | /* Messing with thread structures, avoid deadlock */ |
||
651 | ipl = interrupts_disable(); |
||
652 | spinlock_lock(&threads_lock); |
||
2030 | decky | 653 | |
2712 | decky | 654 | if (sizeof(uintptr_t) == 4) { |
655 | printf("tid name address state task " |
||
656 | "ctx code stack cycles cpu " |
||
657 | "waitqueue\n"); |
||
658 | printf("------ ---------- ---------- -------- ---------- " |
||
659 | "--- ---------- ---------- ---------- ---- " |
||
660 | "----------\n"); |
||
661 | } else { |
||
662 | printf("tid name address state task " |
||
663 | "ctx code stack cycles cpu " |
||
664 | "waitqueue\n"); |
||
665 | printf("------ ---------- ------------------ -------- ------------------ " |
||
666 | "--- ------------------ ------------------ ---------- ---- " |
||
667 | "------------------\n"); |
||
668 | } |
||
777 | palkovsky | 669 | |
2504 | jermar | 670 | avltree_walk(&threads_tree, thread_walker, NULL); |
1158 | jermar | 671 | |
777 | palkovsky | 672 | spinlock_unlock(&threads_lock); |
1060 | palkovsky | 673 | interrupts_restore(ipl); |
777 | palkovsky | 674 | } |
1066 | jermar | 675 | |
1158 | jermar | 676 | /** Check whether thread exists. |
677 | * |
||
678 | * Note that threads_lock must be already held and |
||
679 | * interrupts must be already disabled. |
||
680 | * |
||
681 | * @param t Pointer to thread. |
||
682 | * |
||
683 | * @return True if thread t is known to the system, false otherwise. |
||
684 | */ |
||
685 | bool thread_exists(thread_t *t) |
||
686 | { |
||
2502 | jermar | 687 | avltree_node_t *node; |
688 | |||
689 | node = avltree_search(&threads_tree, (avltree_key_t) ((uintptr_t) t)); |
||
1158 | jermar | 690 | |
2502 | jermar | 691 | return node != NULL; |
1158 | jermar | 692 | } |
693 | |||
2030 | decky | 694 | |
695 | /** Update accounting of current thread. |
||
696 | * |
||
697 | * Note that thread_lock on THREAD must be already held and |
||
698 | * interrupts must be already disabled. |
||
699 | * |
||
700 | */ |
||
701 | void thread_update_accounting(void) |
||
702 | { |
||
703 | uint64_t time = get_cycle(); |
||
704 | THREAD->cycles += time - THREAD->last_cycle; |
||
705 | THREAD->last_cycle = time; |
||
706 | } |
||
707 | |||
1066 | jermar | 708 | /** Process syscall to create new thread. |
709 | * |
||
710 | */ |
||
2436 | jermar | 711 | unative_t sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name, |
712 | thread_id_t *uspace_thread_id) |
||
1066 | jermar | 713 | { |
1210 | vana | 714 | thread_t *t; |
715 | char namebuf[THREAD_NAME_BUFLEN]; |
||
1103 | jermar | 716 | uspace_arg_t *kernel_uarg; |
1288 | jermar | 717 | int rc; |
1066 | jermar | 718 | |
1288 | jermar | 719 | rc = copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN); |
720 | if (rc != 0) |
||
1780 | jermar | 721 | return (unative_t) rc; |
1066 | jermar | 722 | |
2470 | jermar | 723 | /* |
724 | * In case of failure, kernel_uarg will be deallocated in this function. |
||
725 | * In case of success, kernel_uarg will be freed in uinit(). |
||
726 | */ |
||
727 | kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0); |
||
728 | |||
1288 | jermar | 729 | rc = copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t)); |
730 | if (rc != 0) { |
||
731 | free(kernel_uarg); |
||
1780 | jermar | 732 | return (unative_t) rc; |
1288 | jermar | 733 | } |
1078 | jermar | 734 | |
2440 | jermar | 735 | t = thread_create(uinit, kernel_uarg, TASK, |
736 | THREAD_FLAG_USPACE | THREAD_FLAG_NOATTACH, namebuf, false); |
||
2087 | jermar | 737 | if (t) { |
2440 | jermar | 738 | if (uspace_thread_id != NULL) { |
739 | int rc; |
||
740 | |||
741 | rc = copy_to_uspace(uspace_thread_id, &t->tid, |
||
742 | sizeof(t->tid)); |
||
743 | if (rc != 0) { |
||
744 | /* |
||
745 | * We have encountered a failure, but the thread |
||
746 | * has already been created. We need to undo its |
||
747 | * creation now. |
||
748 | */ |
||
749 | |||
750 | /* |
||
2446 | jermar | 751 | * The new thread structure is initialized, but |
752 | * is still not visible to the system. |
||
2440 | jermar | 753 | * We can safely deallocate it. |
754 | */ |
||
755 | slab_free(thread_slab, t); |
||
756 | free(kernel_uarg); |
||
757 | |||
758 | return (unative_t) rc; |
||
759 | } |
||
760 | } |
||
761 | thread_attach(t, TASK); |
||
1210 | vana | 762 | thread_ready(t); |
2440 | jermar | 763 | |
2903 | svoboda | 764 | /* Generate udebug THREAD_B event */ |
765 | udebug_thread_b_event(t); |
||
2867 | svoboda | 766 | |
2440 | jermar | 767 | return 0; |
2216 | decky | 768 | } else |
1078 | jermar | 769 | free(kernel_uarg); |
1066 | jermar | 770 | |
1780 | jermar | 771 | return (unative_t) ENOMEM; |
1066 | jermar | 772 | } |
773 | |||
774 | /** Process syscall to terminate thread. |
||
775 | * |
||
776 | */ |
||
1780 | jermar | 777 | unative_t sys_thread_exit(int uspace_status) |
1066 | jermar | 778 | { |
1210 | vana | 779 | thread_exit(); |
780 | /* Unreachable */ |
||
781 | return 0; |
||
1066 | jermar | 782 | } |
1702 | cejka | 783 | |
2187 | decky | 784 | /** Syscall for getting TID. |
785 | * |
||
2216 | decky | 786 | * @param uspace_thread_id Userspace address of 8-byte buffer where to store |
787 | * current thread ID. |
||
788 | * |
||
789 | * @return 0 on success or an error code from @ref errno.h. |
||
2187 | decky | 790 | */ |
2216 | decky | 791 | unative_t sys_thread_get_id(thread_id_t *uspace_thread_id) |
2187 | decky | 792 | { |
793 | /* |
||
794 | * No need to acquire lock on THREAD because tid |
||
795 | * remains constant for the lifespan of the thread. |
||
796 | */ |
||
2216 | decky | 797 | return (unative_t) copy_to_uspace(uspace_thread_id, &THREAD->tid, |
798 | sizeof(THREAD->tid)); |
||
2187 | decky | 799 | } |
800 | |||
1757 | jermar | 801 | /** @} |
1702 | cejka | 802 | */ |