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1 | jermar | 1 | /* |
2 | * Copyright (C) 2001-2004 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 | |||
29 | #include <proc/scheduler.h> |
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30 | #include <proc/thread.h> |
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31 | #include <proc/task.h> |
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1078 | jermar | 32 | #include <proc/uarg.h> |
1 | jermar | 33 | #include <mm/frame.h> |
34 | #include <mm/page.h> |
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35 | #include <arch/asm.h> |
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36 | #include <arch.h> |
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37 | #include <synch/synch.h> |
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38 | #include <synch/spinlock.h> |
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39 | #include <synch/waitq.h> |
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40 | #include <synch/rwlock.h> |
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41 | #include <cpu.h> |
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42 | #include <func.h> |
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43 | #include <context.h> |
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788 | jermar | 44 | #include <adt/list.h> |
1 | jermar | 45 | #include <typedefs.h> |
46 | #include <time/clock.h> |
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788 | jermar | 47 | #include <adt/list.h> |
7 | jermar | 48 | #include <config.h> |
49 | #include <arch/interrupt.h> |
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10 | jermar | 50 | #include <smp/ipi.h> |
76 | jermar | 51 | #include <arch/faddr.h> |
111 | palkovsky | 52 | #include <arch/atomic.h> |
195 | vana | 53 | #include <memstr.h> |
777 | palkovsky | 54 | #include <print.h> |
787 | palkovsky | 55 | #include <mm/slab.h> |
56 | #include <debug.h> |
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1066 | jermar | 57 | #include <main/uinit.h> |
7 | jermar | 58 | |
107 | decky | 59 | char *thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /**< Thread states */ |
1 | jermar | 60 | |
623 | jermar | 61 | SPINLOCK_INITIALIZE(threads_lock); /**< Lock protecting threads_head list. For locking rules, see declaration thereof. */ |
624 | jermar | 62 | LIST_INITIALIZE(threads_head); /**< List of all threads. */ |
1 | jermar | 63 | |
623 | jermar | 64 | SPINLOCK_INITIALIZE(tidlock); |
1 | jermar | 65 | __u32 last_tid = 0; |
66 | |||
787 | palkovsky | 67 | static slab_cache_t *thread_slab; |
906 | palkovsky | 68 | #ifdef ARCH_HAS_FPU |
69 | slab_cache_t *fpu_context_slab; |
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70 | #endif |
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107 | decky | 71 | |
787 | palkovsky | 72 | |
107 | decky | 73 | /** Thread wrapper |
74 | * |
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75 | * This wrapper is provided to ensure that every thread |
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1 | jermar | 76 | * makes a call to thread_exit() when its implementing |
77 | * function returns. |
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78 | * |
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413 | jermar | 79 | * interrupts_disable() is assumed. |
107 | decky | 80 | * |
1 | jermar | 81 | */ |
452 | decky | 82 | static void cushion(void) |
1 | jermar | 83 | { |
15 | jermar | 84 | void (*f)(void *) = THREAD->thread_code; |
85 | void *arg = THREAD->thread_arg; |
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1 | jermar | 86 | |
213 | jermar | 87 | /* this is where each thread wakes up after its creation */ |
15 | jermar | 88 | spinlock_unlock(&THREAD->lock); |
413 | jermar | 89 | interrupts_enable(); |
1 | jermar | 90 | |
91 | f(arg); |
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92 | thread_exit(); |
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93 | /* not reached */ |
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94 | } |
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95 | |||
787 | palkovsky | 96 | /** Initialization and allocation for thread_t structure */ |
97 | static int thr_constructor(void *obj, int kmflags) |
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98 | { |
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99 | thread_t *t = (thread_t *)obj; |
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814 | palkovsky | 100 | pfn_t pfn; |
842 | palkovsky | 101 | int status; |
107 | decky | 102 | |
787 | palkovsky | 103 | spinlock_initialize(&t->lock, "thread_t_lock"); |
104 | link_initialize(&t->rq_link); |
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105 | link_initialize(&t->wq_link); |
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106 | link_initialize(&t->th_link); |
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107 | link_initialize(&t->threads_link); |
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108 | |||
906 | palkovsky | 109 | #ifdef ARCH_HAS_FPU |
110 | # ifdef CONFIG_FPU_LAZY |
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111 | t->saved_fpu_context = NULL; |
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112 | # else |
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113 | t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags); |
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114 | if (!t->saved_fpu_context) |
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115 | return -1; |
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116 | # endif |
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117 | #endif |
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118 | |||
935 | vana | 119 | pfn = frame_alloc_rc(STACK_FRAMES, FRAME_KA | kmflags,&status); |
906 | palkovsky | 120 | if (status) { |
121 | #ifdef ARCH_HAS_FPU |
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122 | if (t->saved_fpu_context) |
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123 | slab_free(fpu_context_slab,t->saved_fpu_context); |
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124 | #endif |
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842 | palkovsky | 125 | return -1; |
906 | palkovsky | 126 | } |
814 | palkovsky | 127 | t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn)); |
787 | palkovsky | 128 | |
129 | return 0; |
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130 | } |
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131 | |||
132 | /** Destruction of thread_t object */ |
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133 | static int thr_destructor(void *obj) |
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134 | { |
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135 | thread_t *t = (thread_t *)obj; |
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136 | |||
814 | palkovsky | 137 | frame_free(ADDR2PFN(KA2PA(t->kstack))); |
906 | palkovsky | 138 | #ifdef ARCH_HAS_FPU |
139 | if (t->saved_fpu_context) |
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140 | slab_free(fpu_context_slab,t->saved_fpu_context); |
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141 | #endif |
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787 | palkovsky | 142 | return 1; /* One page freed */ |
143 | } |
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144 | |||
107 | decky | 145 | /** Initialize threads |
146 | * |
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147 | * Initialize kernel threads support. |
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148 | * |
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149 | */ |
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1 | jermar | 150 | void thread_init(void) |
151 | { |
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15 | jermar | 152 | THREAD = NULL; |
625 | palkovsky | 153 | atomic_set(&nrdy,0); |
787 | palkovsky | 154 | thread_slab = slab_cache_create("thread_slab", |
155 | sizeof(thread_t),0, |
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156 | thr_constructor, thr_destructor, 0); |
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906 | palkovsky | 157 | #ifdef ARCH_HAS_FPU |
158 | fpu_context_slab = slab_cache_create("fpu_slab", |
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159 | sizeof(fpu_context_t), |
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160 | FPU_CONTEXT_ALIGN, |
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161 | NULL, NULL, 0); |
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162 | #endif |
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1 | jermar | 163 | } |
164 | |||
107 | decky | 165 | |
166 | /** Make thread ready |
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167 | * |
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168 | * Switch thread t to the ready state. |
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169 | * |
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170 | * @param t Thread to make ready. |
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171 | * |
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172 | */ |
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1 | jermar | 173 | void thread_ready(thread_t *t) |
174 | { |
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175 | cpu_t *cpu; |
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176 | runq_t *r; |
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413 | jermar | 177 | ipl_t ipl; |
625 | palkovsky | 178 | int i, avg; |
1 | jermar | 179 | |
413 | jermar | 180 | ipl = interrupts_disable(); |
1 | jermar | 181 | |
182 | spinlock_lock(&t->lock); |
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183 | |||
1086 | palkovsky | 184 | ASSERT(! (t->state == Ready)); |
185 | |||
413 | jermar | 186 | i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority; |
1 | jermar | 187 | |
16 | jermar | 188 | cpu = CPU; |
1 | jermar | 189 | if (t->flags & X_WIRED) { |
190 | cpu = t->cpu; |
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191 | } |
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1083 | palkovsky | 192 | t->state = Ready; |
1 | jermar | 193 | spinlock_unlock(&t->lock); |
194 | |||
107 | decky | 195 | /* |
1 | jermar | 196 | * Append t to respective ready queue on respective processor. |
197 | */ |
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198 | r = &cpu->rq[i]; |
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199 | spinlock_lock(&r->lock); |
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200 | list_append(&t->rq_link, &r->rq_head); |
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201 | r->n++; |
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202 | spinlock_unlock(&r->lock); |
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203 | |||
475 | jermar | 204 | atomic_inc(&nrdy); |
625 | palkovsky | 205 | avg = atomic_get(&nrdy) / config.cpu_active; |
783 | palkovsky | 206 | atomic_inc(&cpu->nrdy); |
1 | jermar | 207 | |
413 | jermar | 208 | interrupts_restore(ipl); |
1 | jermar | 209 | } |
210 | |||
107 | decky | 211 | |
787 | palkovsky | 212 | /** Destroy thread memory structure |
213 | * |
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214 | * Detach thread from all queues, cpus etc. and destroy it. |
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215 | * |
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216 | * Assume thread->lock is held!! |
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217 | */ |
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218 | void thread_destroy(thread_t *t) |
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219 | { |
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220 | ASSERT(t->state == Exiting); |
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221 | ASSERT(t->task); |
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222 | ASSERT(t->cpu); |
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223 | |||
224 | spinlock_lock(&t->cpu->lock); |
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225 | if(t->cpu->fpu_owner==t) |
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226 | t->cpu->fpu_owner=NULL; |
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227 | spinlock_unlock(&t->cpu->lock); |
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228 | |||
229 | /* |
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230 | * Detach from the containing task. |
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231 | */ |
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232 | spinlock_lock(&t->task->lock); |
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233 | list_remove(&t->th_link); |
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234 | spinlock_unlock(&t->task->lock); |
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235 | |||
236 | spinlock_unlock(&t->lock); |
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237 | |||
238 | spinlock_lock(&threads_lock); |
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239 | list_remove(&t->threads_link); |
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240 | spinlock_unlock(&threads_lock); |
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241 | |||
242 | slab_free(thread_slab, t); |
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243 | } |
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244 | |||
245 | |||
107 | decky | 246 | /** Create new thread |
247 | * |
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248 | * Create a new thread. |
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249 | * |
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250 | * @param func Thread's implementing function. |
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251 | * @param arg Thread's implementing function argument. |
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252 | * @param task Task to which the thread belongs. |
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253 | * @param flags Thread flags. |
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1062 | jermar | 254 | * @param name Symbolic name. |
107 | decky | 255 | * |
256 | * @return New thread's structure on success, NULL on failure. |
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257 | * |
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258 | */ |
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1062 | jermar | 259 | thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags, char *name) |
1 | jermar | 260 | { |
261 | thread_t *t; |
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822 | palkovsky | 262 | ipl_t ipl; |
263 | |||
787 | palkovsky | 264 | t = (thread_t *) slab_alloc(thread_slab, 0); |
842 | palkovsky | 265 | if (!t) |
266 | return NULL; |
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1 | jermar | 267 | |
822 | palkovsky | 268 | /* Not needed, but good for debugging */ |
269 | memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0); |
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270 | |||
271 | ipl = interrupts_disable(); |
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272 | spinlock_lock(&tidlock); |
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273 | t->tid = ++last_tid; |
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274 | spinlock_unlock(&tidlock); |
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275 | interrupts_restore(ipl); |
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276 | |||
277 | context_save(&t->saved_context); |
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278 | context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE); |
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279 | |||
280 | the_initialize((the_t *) t->kstack); |
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281 | |||
282 | ipl = interrupts_disable(); |
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283 | t->saved_context.ipl = interrupts_read(); |
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284 | interrupts_restore(ipl); |
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285 | |||
1066 | jermar | 286 | memcpy(t->name, name, THREAD_NAME_BUFLEN); |
287 | |||
822 | palkovsky | 288 | t->thread_code = func; |
289 | t->thread_arg = arg; |
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290 | t->ticks = -1; |
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291 | t->priority = -1; /* start in rq[0] */ |
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292 | t->cpu = NULL; |
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293 | t->flags = 0; |
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294 | t->state = Entering; |
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295 | t->call_me = NULL; |
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296 | t->call_me_with = NULL; |
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297 | |||
298 | timeout_initialize(&t->sleep_timeout); |
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299 | t->sleep_queue = NULL; |
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300 | t->timeout_pending = 0; |
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301 | |||
302 | t->rwlock_holder_type = RWLOCK_NONE; |
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210 | decky | 303 | |
822 | palkovsky | 304 | t->task = task; |
305 | |||
860 | decky | 306 | t->fpu_context_exists = 0; |
307 | t->fpu_context_engaged = 0; |
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822 | palkovsky | 308 | |
309 | /* |
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310 | * Register this thread in the system-wide list. |
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311 | */ |
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312 | ipl = interrupts_disable(); |
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313 | spinlock_lock(&threads_lock); |
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314 | list_append(&t->threads_link, &threads_head); |
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315 | spinlock_unlock(&threads_lock); |
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316 | |||
317 | /* |
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318 | * Attach to the containing task. |
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319 | */ |
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320 | spinlock_lock(&task->lock); |
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321 | list_append(&t->th_link, &task->th_head); |
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322 | spinlock_unlock(&task->lock); |
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323 | |||
324 | interrupts_restore(ipl); |
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860 | decky | 325 | |
1 | jermar | 326 | return t; |
327 | } |
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328 | |||
107 | decky | 329 | |
330 | /** Make thread exiting |
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331 | * |
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332 | * End current thread execution and switch it to the exiting |
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333 | * state. All pending timeouts are executed. |
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334 | * |
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335 | */ |
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1 | jermar | 336 | void thread_exit(void) |
337 | { |
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413 | jermar | 338 | ipl_t ipl; |
1 | jermar | 339 | |
340 | restart: |
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413 | jermar | 341 | ipl = interrupts_disable(); |
15 | jermar | 342 | spinlock_lock(&THREAD->lock); |
343 | if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */ |
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344 | spinlock_unlock(&THREAD->lock); |
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413 | jermar | 345 | interrupts_restore(ipl); |
1 | jermar | 346 | goto restart; |
347 | } |
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15 | jermar | 348 | THREAD->state = Exiting; |
349 | spinlock_unlock(&THREAD->lock); |
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1 | jermar | 350 | scheduler(); |
351 | } |
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352 | |||
107 | decky | 353 | |
354 | /** Thread sleep |
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355 | * |
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356 | * Suspend execution of the current thread. |
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357 | * |
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358 | * @param sec Number of seconds to sleep. |
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359 | * |
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360 | */ |
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1 | jermar | 361 | void thread_sleep(__u32 sec) |
362 | { |
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125 | jermar | 363 | thread_usleep(sec*1000000); |
1 | jermar | 364 | } |
107 | decky | 365 | |
366 | |||
367 | /** Thread usleep |
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368 | * |
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369 | * Suspend execution of the current thread. |
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370 | * |
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371 | * @param usec Number of microseconds to sleep. |
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372 | * |
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373 | */ |
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1 | jermar | 374 | void thread_usleep(__u32 usec) |
375 | { |
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376 | waitq_t wq; |
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377 | |||
378 | waitq_initialize(&wq); |
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379 | |||
380 | (void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING); |
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381 | } |
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382 | |||
107 | decky | 383 | |
384 | /** Register thread out-of-context invocation |
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385 | * |
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386 | * Register a function and its argument to be executed |
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387 | * on next context switch to the current thread. |
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388 | * |
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389 | * @param call_me Out-of-context function. |
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390 | * @param call_me_with Out-of-context function argument. |
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391 | * |
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392 | */ |
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1 | jermar | 393 | void thread_register_call_me(void (* call_me)(void *), void *call_me_with) |
394 | { |
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413 | jermar | 395 | ipl_t ipl; |
1 | jermar | 396 | |
413 | jermar | 397 | ipl = interrupts_disable(); |
15 | jermar | 398 | spinlock_lock(&THREAD->lock); |
399 | THREAD->call_me = call_me; |
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400 | THREAD->call_me_with = call_me_with; |
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401 | spinlock_unlock(&THREAD->lock); |
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413 | jermar | 402 | interrupts_restore(ipl); |
1 | jermar | 403 | } |
777 | palkovsky | 404 | |
405 | /** Print list of threads debug info */ |
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406 | void thread_print_list(void) |
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407 | { |
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408 | link_t *cur; |
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409 | thread_t *t; |
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410 | ipl_t ipl; |
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411 | |||
412 | /* Messing with thread structures, avoid deadlock */ |
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413 | ipl = interrupts_disable(); |
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414 | spinlock_lock(&threads_lock); |
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415 | |||
416 | for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) { |
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417 | t = list_get_instance(cur, thread_t, threads_link); |
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1086 | palkovsky | 418 | printf("%s: address=%P, tid=%d, state=%s\n\ttask=%P, code=%P, stack=%P, cpu=", |
1062 | jermar | 419 | t->name, t, t->tid, thread_states[t->state], t->task, t->thread_code, t->kstack); |
777 | palkovsky | 420 | if (t->cpu) |
421 | printf("cpu%d ", t->cpu->id); |
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1062 | jermar | 422 | else |
423 | printf("none"); |
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777 | palkovsky | 424 | printf("\n"); |
425 | } |
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426 | |||
427 | spinlock_unlock(&threads_lock); |
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1060 | palkovsky | 428 | interrupts_restore(ipl); |
777 | palkovsky | 429 | } |
1066 | jermar | 430 | |
431 | /** Process syscall to create new thread. |
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432 | * |
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433 | */ |
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1078 | jermar | 434 | __native sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name) |
1066 | jermar | 435 | { |
436 | thread_t *t; |
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437 | char namebuf[THREAD_NAME_BUFLEN]; |
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1103 | jermar | 438 | uspace_arg_t *kernel_uarg; |
1066 | jermar | 439 | __u32 tid; |
440 | |||
1078 | jermar | 441 | copy_from_uspace(namebuf, uspace_name, THREAD_NAME_BUFLEN); |
1066 | jermar | 442 | |
1078 | jermar | 443 | kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0); |
444 | copy_from_uspace(kernel_uarg, uspace_uarg, sizeof(uspace_arg_t)); |
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445 | |||
446 | if ((t = thread_create(uinit, kernel_uarg, TASK, 0, namebuf))) { |
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1066 | jermar | 447 | tid = t->tid; |
448 | thread_ready(t); |
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449 | return (__native) tid; |
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450 | } else { |
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1078 | jermar | 451 | free(kernel_uarg); |
1066 | jermar | 452 | } |
453 | |||
454 | return (__native) -1; |
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455 | } |
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456 | |||
457 | /** Process syscall to terminate thread. |
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458 | * |
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459 | */ |
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1078 | jermar | 460 | __native sys_thread_exit(int uspace_status) |
1066 | jermar | 461 | { |
462 | thread_exit(); |
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463 | /* Unreachable */ |
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464 | return 0; |
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465 | } |