scheduler.hpp (9106B)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 | /* Relacy Race Detector * Copyright (c) 2008-2010, Dmitry S. Vyukov * All rights reserved. * This software is provided AS-IS with no warranty, either express or implied. * This software is distributed under a license and may not be copied, * modified or distributed except as expressly authorized under the * terms of the license contained in the file LICENSE.TXT in this distribution. */ #ifndef RL_SCHEDULER_HPP #define RL_SCHEDULER_HPP #ifdef _MSC_VER # pragma once #endif #include "base.hpp" #include "context_base.hpp" namespace rl { enum thread_state_e { thread_state_running, thread_state_blocked, thread_state_finished, }; enum thread_finish_result { thread_finish_result_normal, thread_finish_result_last, thread_finish_result_deadlock, }; struct scheduler_thread_info { thread_id_t index_; unsigned block_count_; thread_state_e state_; void reset(test_params& /*params*/) { block_count_ = 0; state_ = thread_state_running; } }; template<typename derived_t, typename thread_info_type, thread_id_t thread_count> class scheduler : nocopy<> { public: typedef thread_info_type thread_info_t; struct shared_context_t { typedef typename derived_t::task_t task_t; //CRITICAL_SECTION guard_; queue<task_t> queue_; }; scheduler(test_params& params, shared_context_t& ctx, thread_id_t dynamic_thread_count) : params_(params) , ctx_(ctx) , total_dynamic_threads_(dynamic_thread_count) , iter_() , thread_() { for (thread_id_t i = 0; i != thread_count; ++i) { threads_[i].index_ = i; } } thread_id_t iteration_begin(iteration_t iter) { iter_ = iter; running_threads_count = thread_count; finished_thread_count_ = 0; timed_thread_count_ = 0; spurious_thread_count_ = 0; dynamic_thread_count_ = 0; for (thread_id_t i = 0; i != thread_count; ++i) { running_threads.push_back(i); threads_[i].reset(params_); } for (thread_id_t i = thread_count - total_dynamic_threads_; i != thread_count; ++i) { dynamic_threads_[dynamic_thread_count_++] = &threads_[i]; block_thread(i, false); } thread_id_t const th = self().iteration_begin_impl(); thread_ = &threads_[th]; return th; } bool iteration_end() { bool const finish = self().iteration_end_impl(); thread_ = 0; return finish; } thread_id_t schedule(unpark_reason& reason, unsigned yield) { thread_id_t const th = self().schedule_impl(reason, yield); RL_VERIFY(threads_[th].state_ == thread_state_running); thread_ = &threads_[th]; return th; } RL_INLINE unsigned rand(unsigned limit, sched_type t) { RL_VERIFY(limit); return self().rand_impl(limit, t); } iteration_t iteration_count() { return self().iteration_count_impl(); } bool park_current_thread(bool is_timed, bool allow_spurious_wakeup) { if (is_timed) { timed_threads_[timed_thread_count_++] = thread_; RL_VERIFY(timed_thread_count_ <= thread_count); } if (allow_spurious_wakeup) { spurious_threads_[spurious_thread_count_++] = thread_; RL_VERIFY(spurious_thread_count_ <= thread_count); } block_thread(thread_->index_, true); return is_deadlock() ? false : true; } void unpark_thread(thread_id_t th, bool do_switch = false) { (void)do_switch; unblock_thread(th); thread_info_t& t = threads_[th]; //!!! store flag as to whether thread is spurious blocked in thread object // (to eliminate iteration over all threads) for (thread_id_t i = 0; i != spurious_thread_count_; ++i) { if (spurious_threads_[i] == &t) { for (thread_id_t j = i + 1; j != spurious_thread_count_; ++j) spurious_threads_[j - 1] = spurious_threads_[j]; spurious_thread_count_ -= 1; break; } } //!!! store flag as to whether thread is spurious blocked in thread object for (thread_id_t i = 0; i != timed_thread_count_; ++i) { if (timed_threads_[i] == &t) { for (thread_id_t j = i + 1; j != timed_thread_count_; ++j) timed_threads_[j - 1] = timed_threads_[j]; timed_thread_count_ -= 1; break; } } } thread_finish_result thread_finished() { RL_VERIFY(thread_->state_ == thread_state_running); block_thread(thread_->index_, false); thread_->state_ = thread_state_finished; finished_thread_count_ += 1; self().thread_finished_impl(); retry: if (finished_thread_count_ == thread_count) { return thread_finish_result_last; } else if (is_deadlock()) { if (dynamic_thread_count_) { while (dynamic_thread_count_) { thread_info_t* th = dynamic_threads_[--dynamic_thread_count_]; unblock_thread(th->index_); } goto retry; } return thread_finish_result_deadlock; } else { return thread_finish_result_normal; } } thread_id_t create_thread() { RL_VERIFY(dynamic_thread_count_); thread_info_t* th = dynamic_threads_[--dynamic_thread_count_]; unblock_thread(th->index_); return th->index_; } void get_state(std::ostream& ss) { self().get_state_impl(ss); } void set_state(std::istream& ss) { self().set_state_impl(ss); } protected: test_params& params_; shared_context_t& ctx_; thread_id_t const total_dynamic_threads_; iteration_t iter_; aligned<thread_info_t> threads_ [thread_count]; thread_info_t* thread_; vector<thread_id_t>::type running_threads; thread_id_t running_threads_count; thread_id_t finished_thread_count_; //!!! doesn't timed/spurious waits must belong to full scheduler? // hyphotesis: random scheduler can ignore timed/spurious waits // (however must detect deadlock with spurious threads) thread_info_t* timed_threads_ [thread_count]; thread_id_t timed_thread_count_; thread_info_t* spurious_threads_ [thread_count]; thread_id_t spurious_thread_count_; thread_info_t* dynamic_threads_ [thread_count]; thread_id_t dynamic_thread_count_; void block_thread(thread_id_t th, bool yield) { RL_VERIFY(th < thread_count); thread_info_t& t = threads_[th]; RL_VERIFY(t.state_ != thread_state_finished); if (t.block_count_++) return; for (thread_id_t i = 0; i != running_threads_count; ++i) { if (running_threads[i] == th) { running_threads.erase(running_threads.begin() + i); running_threads_count -= 1; t.state_ = thread_state_blocked; self().on_thread_block(th, yield); return; } } RL_VERIFY(false); } bool unblock_thread(thread_id_t th) { RL_VERIFY(th < thread_count); thread_info_t& t = threads_[th]; RL_VERIFY(t.state_ == thread_state_blocked); if (--t.block_count_) return false; running_threads.push_back(th); running_threads_count += 1; t.state_ = thread_state_running; return true; } private: derived_t& self() { return *static_cast<derived_t*>(this); } bool is_deadlock() { if ((0 == running_threads_count) && (0 == timed_thread_count_)) { self().purge_blocked_threads(); if ((0 == running_threads_count) && (0 == timed_thread_count_)) return true; } return false; } void thread_finished_impl() { } void purge_blocked_threads() { } }; } #endif |