semaphore.hpp (15972B)
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 | /* 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_SEMAPHORE_HPP #define RL_SEMAPHORE_HPP #ifdef _MSC_VER # pragma once #endif #include "../base.hpp" #include "../context_base.hpp" #include "../sync_var.hpp" #include "../waitset.hpp" #include "../signature.hpp" namespace rl { enum sema_wakeup_reason { sema_wakeup_reason_success, sema_wakeup_reason_failed, sema_wakeup_reason_timeout, sema_wakeup_reason_spurious, }; struct win_object { virtual void deinit(debug_info_param info) = 0; virtual ~win_object() {} }; struct win_waitable_object : win_object { virtual sema_wakeup_reason wait(bool try_wait, bool is_timed, debug_info_param info) = 0; virtual bool signal(debug_info_param info) = 0; virtual bool is_signaled(debug_info_param info) = 0; virtual void memory_acquire(debug_info_param info) = 0; virtual void* prepare_wait(debug_info_param info) = 0; }; struct sema_data { virtual sema_wakeup_reason wait(bool try_wait, bool is_timed, debug_info_param info) = 0; virtual bool post(unsigned count, unsigned& prev_count, debug_info_param info) = 0; virtual int get_value(debug_info_param info) = 0; virtual bool is_signaled(debug_info_param info) = 0; virtual void memory_acquire(debug_info_param info) = 0; virtual void* prepare_wait(debug_info_param info) = 0; virtual ~sema_data() {} // just to calm down gcc }; template<thread_id_t thread_count> class sema_data_impl : public sema_data { public: sema_data_impl(bool spurious_wakeups, unsigned initial_count, unsigned max_count) : spurious_wakeups_(spurious_wakeups) , count_(initial_count) , max_count_(max_count) { RL_VERIFY(max_count <= INT_MAX); } ~sema_data_impl() { //!!! detect destruction with waiters } struct wait_event { sema_data_impl* addr_; bool try_wait_; bool is_timed_; unsigned count_; sema_wakeup_reason reason_; void output(std::ostream& s) const { s << "<" << std::hex << addr_ << std::dec << "> semaphore: "; if (try_wait_) s << "try_wait "; else if (is_timed_) s << "timed wait "; else s << "wait "; if (reason_ == sema_wakeup_reason_success) s << "succeeded "; else if (reason_ == sema_wakeup_reason_failed) s << "failed "; else if (reason_ == sema_wakeup_reason_timeout) s << "timed out "; else if (reason_ == sema_wakeup_reason_spurious) s << "spuriously failed "; s << "new_count=" << count_; } }; struct post_event { sema_data_impl* addr_; unsigned value_; unsigned count_; bool result_; thread_id_t unblocked_; void output(std::ostream& s) const { s << "<" << std::hex << addr_ << std::dec << "> semaphore: "; if (result_) s << "post "; else s << "post FAILED "; s << "value=" << value_; s << " new_count=" << count_; s << " unblocked=" << unblocked_; } }; struct get_value_event { sema_data_impl* addr_; unsigned count_; void output(std::ostream& s) const { s << "<" << std::hex << addr_ << std::dec << "> semaphore: "; s << "get_value count=" << count_; } }; virtual sema_wakeup_reason wait(bool try_wait, bool is_timed, debug_info_param info) { context& c = ctx(); c.sched(); sign_.check(info); sema_wakeup_reason reason = sema_wakeup_reason_success; for (;;) { if (count_) { count_ -= 1; sync_.acq_rel(c.threadx_); reason = sema_wakeup_reason_success; break; } if (try_wait) { sync_.acquire(c.threadx_); reason = sema_wakeup_reason_failed; break; } unpark_reason wr = ws_.park_current(c, is_timed, spurious_wakeups_, true, info); if (unpark_reason_timeout == wr) { RL_VERIFY(is_timed); sync_.acquire(c.threadx_); reason = sema_wakeup_reason_timeout; break; } else if (unpark_reason_spurious == wr) { RL_VERIFY(spurious_wakeups_); sync_.acquire(c.threadx_); reason = sema_wakeup_reason_spurious; break; } else if (unpark_reason_normal == wr) { RL_VERIFY(count_ > 0); count_ -= 1; sync_.acq_rel(c.threadx_); c.switch_back(info); reason = sema_wakeup_reason_success; break; } RL_VERIFY(false); } RL_HIST(wait_event) {this, try_wait, is_timed, count_, reason} RL_HIST_END(); return reason; } virtual bool post(unsigned count, unsigned& prev_count, debug_info_param info) { context& c = ctx(); c.sched(); sign_.check(info); bool result = false; prev_count = count_; thread_id_t unblocked = 0; if (false == (count >= INT_MAX || count + count_ > max_count_)) { result = true; count_ += count; sync_.acq_rel(c.threadx_); for (unsigned i = 0; i != count; ++i) { if (false == ws_.unpark_one(c, info)) break; unblocked += 1; } } else { sync_.acquire(c.threadx_); } RL_HIST(post_event) {this, count, count_, result, unblocked} RL_HIST_END(); return result; } virtual int get_value(debug_info_param info) { context& c = ctx(); c.sched(); sign_.check(info); RL_VERIFY(count_ <= INT_MAX); int result = (int)count_ - ws_.size(); sync_.acquire(c.threadx_); RL_HIST(get_value_event) {this, (unsigned)result} RL_HIST_END(); return result; } private: signature<0xaabb6634> sign_; bool const spurious_wakeups_; unsigned count_; unsigned const max_count_; waitset<thread_count> ws_; sync_var<thread_count> sync_; virtual bool is_signaled(debug_info_param info) { (void)info; return count_ > 0; } virtual void memory_acquire(debug_info_param info) { (void)info; sync_.acquire(ctx().threadx_); } virtual void* prepare_wait(debug_info_param info) { (void)info; return &ws_; } RL_NOCOPY(sema_data_impl); }; template<typename tag_t> class semaphore : public win_waitable_object { public: semaphore() : impl_() { } semaphore(semaphore const&) : impl_() { } semaphore& operator = (semaphore const&) { return *this; } void init(bool spurious_wakeups, unsigned initial_count, unsigned max_count, debug_info_param info) { context& c = ctx(); RL_ASSERT_IMPL(0 == impl_, test_result_double_initialization_of_semaphore, "", info); sign_.check(info); impl_ = c.sema_ctor(spurious_wakeups, initial_count, max_count); } void deinit(debug_info_param info) { context& c = ctx(); check(info); c.sema_dtor(impl_); impl_ = 0; } virtual sema_wakeup_reason wait(bool try_wait, bool is_timed, debug_info_param info) { check(info); return impl_->wait(try_wait, is_timed, info); } virtual bool signal(debug_info_param info) { unsigned prev_count = 0; return post(1, prev_count, info); } bool post(unsigned count, unsigned& prev_count, debug_info_param info) { check(info); return impl_->post(count, prev_count, info); } int get_value(debug_info_param info) { check(info); return impl_->get_value(info); } private: sema_data* impl_; signature<0x228855dd> sign_; sema_data* check(debug_info_param info) { RL_ASSERT_IMPL(impl_, test_result_usage_of_non_initialized_semaphore, "", info); sign_.check(info); return impl_; } virtual bool is_signaled(debug_info_param info) { return check(info)->is_signaled(info); } virtual void memory_acquire(debug_info_param info) { check(info)->memory_acquire(info); } virtual void* prepare_wait(debug_info_param info) { return check(info)->prepare_wait(info); } }; struct wfmo_event { unsigned long count_; bool wait_all_; bool try_wait_; bool is_timed_; sema_wakeup_reason result_; size_t signaled_; void output(std::ostream& s) const { s << "WFMO: " << "count=" << count_ << ", wait_all=" << wait_all_ << ", try_wait=" << try_wait_ << ", is_timed=" << is_timed_ << ", result="; if (sema_wakeup_reason_success == result_) { s << "success"; if (wait_all_ == false) s << ", object=" << signaled_; } else { s << "timeout"; } } }; size_t const wfmo_max_objects = 32; inline sema_wakeup_reason wait_for_multiple_objects( size_t& signaled, size_t count, win_waitable_object** wo, bool wait_all, bool try_wait, bool is_timed, debug_info_param info) { context& c = ctx(); c.sched(); RL_VERIFY(count <= wfmo_max_objects); void* ws [wfmo_max_objects]; sema_wakeup_reason result = sema_wakeup_reason_failed; signaled = 0; if (wait_all) { for (;;) { unsigned long i = 0; for (i = 0; i != count; ++i) { if (false == wo[i]->is_signaled(info)) break; } if (i == count) { preemption_disabler pd (c); for (i = 0; i != count; ++i) { sema_wakeup_reason r = wo[i]->wait(true, false, info); RL_VERIFY(r == sema_wakeup_reason_success); (void)r; } result = sema_wakeup_reason_success; break; } else if (try_wait) { for (i = 0; i != count; ++i) wo[i]->memory_acquire(info); result = sema_wakeup_reason_timeout; break; } else { for (i = 0; i != count; ++i) { ws[i] = wo[i]->prepare_wait(info); } unpark_reason reason = c.wfmo_park(ws, wo, (unsigned)count, !!wait_all, is_timed, info); RL_VERIFY(unpark_reason_spurious != reason); if (unpark_reason_timeout == reason) { for (i = 0; i != count; ++i) wo[i]->memory_acquire(info); result = sema_wakeup_reason_timeout; break; } else if (unpark_reason_normal == reason) { { preemption_disabler pd (c); for (unsigned long i = 0; i != count; ++i) { RL_VERIFY(wo[i]->is_signaled(info)); sema_wakeup_reason r = wo[i]->wait(true, false, info); RL_VERIFY(r == sema_wakeup_reason_success); (void)r; } } c.switch_back(info); result = sema_wakeup_reason_success; break; } RL_VERIFY(false); } } } else { for (;;) { unsigned long i = 0; for (i = 0; i != count; ++i) { if (true == wo[i]->is_signaled(info)) break; } if (i != count) { preemption_disabler pd (c); sema_wakeup_reason r = wo[i]->wait(true, false, info); RL_VERIFY(r == sema_wakeup_reason_success); (void)r; signaled = i; result = sema_wakeup_reason_success; break; } else if (try_wait) { for (i = 0; i != count; ++i) wo[i]->memory_acquire(info); result = sema_wakeup_reason_timeout; break; } else { for (i = 0; i != count; ++i) { ws[i] = wo[i]->prepare_wait(info); } unpark_reason reason = c.wfmo_park(ws, wo, (unsigned)count, !!wait_all, is_timed, info); RL_VERIFY(unpark_reason_spurious != reason); if (unpark_reason_timeout == reason) { for (i = 0; i != count; ++i) wo[i]->memory_acquire(info); result = sema_wakeup_reason_timeout; break; } else if (unpark_reason_normal == reason) { unsigned long i = 0; for (i = 0; i != count; ++i) { if (true == wo[i]->is_signaled(info)) break; } RL_VERIFY(i != count); { preemption_disabler pd (c); sema_wakeup_reason r = wo[i]->wait(true, false, info); RL_VERIFY(r == sema_wakeup_reason_success); (void)r; } c.switch_back(info); signaled = i; result = sema_wakeup_reason_success; break; } RL_VERIFY(false); } } } RL_HIST(wfmo_event) {(unsigned)count, wait_all, try_wait, is_timed, result, signaled} RL_HIST_END(); return result; } } #endif |