libs/corosio/src/corosio/src/detail/posix/signals.cpp
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libs/corosio/src/corosio/src/detail/posix/signals.cpp
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|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2026 Steve Gerbino | ||
| 3 | // | ||
| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| 6 | // | ||
| 7 | // Official repository: https://github.com/cppalliance/corosio | ||
| 8 | // | ||
| 9 | |||
| 10 | #include <boost/corosio/detail/platform.hpp> | ||
| 11 | |||
| 12 | #if BOOST_COROSIO_POSIX | ||
| 13 | |||
| 14 | #include "src/detail/posix/signals.hpp" | ||
| 15 | |||
| 16 | #include <boost/corosio/detail/scheduler.hpp> | ||
| 17 | #include <boost/corosio/detail/except.hpp> | ||
| 18 | #include <boost/capy/coro.hpp> | ||
| 19 | #include <boost/capy/ex/executor_ref.hpp> | ||
| 20 | #include <boost/capy/error.hpp> | ||
| 21 | #include <system_error> | ||
| 22 | |||
| 23 | #include "src/detail/intrusive.hpp" | ||
| 24 | #include "src/detail/scheduler_op.hpp" | ||
| 25 | |||
| 26 | #include <coroutine> | ||
| 27 | #include <cstddef> | ||
| 28 | #include <mutex> | ||
| 29 | #include <stop_token> | ||
| 30 | |||
| 31 | #include <signal.h> | ||
| 32 | |||
| 33 | /* | ||
| 34 | POSIX Signal Implementation | ||
| 35 | =========================== | ||
| 36 | |||
| 37 | This file implements signal handling for POSIX systems using sigaction(). | ||
| 38 | The implementation supports signal flags (SA_RESTART, etc.) and integrates | ||
| 39 | with any POSIX-compatible scheduler via the abstract scheduler interface. | ||
| 40 | |||
| 41 | Architecture Overview | ||
| 42 | --------------------- | ||
| 43 | |||
| 44 | Three layers manage signal registrations: | ||
| 45 | |||
| 46 | 1. signal_state (global singleton) | ||
| 47 | - Tracks the global service list and per-signal registration counts | ||
| 48 | - Stores the flags used for first registration of each signal (for | ||
| 49 | conflict detection when multiple signal_sets register same signal) | ||
| 50 | - Owns the mutex that protects signal handler installation/removal | ||
| 51 | |||
| 52 | 2. posix_signals_impl (one per execution_context) | ||
| 53 | - Maintains registrations_[] table indexed by signal number | ||
| 54 | - Each slot is a doubly-linked list of signal_registrations for that signal | ||
| 55 | - Also maintains impl_list_ of all posix_signal_impl objects it owns | ||
| 56 | |||
| 57 | 3. posix_signal_impl (one per signal_set) | ||
| 58 | - Owns a singly-linked list (sorted by signal number) of signal_registrations | ||
| 59 | - Contains the pending_op_ used for wait operations | ||
| 60 | |||
| 61 | Signal Delivery Flow | ||
| 62 | -------------------- | ||
| 63 | |||
| 64 | 1. Signal arrives -> corosio_posix_signal_handler() (must be async-signal-safe) | ||
| 65 | -> deliver_signal() | ||
| 66 | |||
| 67 | 2. deliver_signal() iterates all posix_signals_impl services: | ||
| 68 | - If a signal_set is waiting (impl->waiting_ == true), post the signal_op | ||
| 69 | to the scheduler for immediate completion | ||
| 70 | - Otherwise, increment reg->undelivered to queue the signal | ||
| 71 | |||
| 72 | 3. When wait() is called via start_wait(): | ||
| 73 | - First check for queued signals (undelivered > 0); if found, post | ||
| 74 | immediate completion without blocking | ||
| 75 | - Otherwise, set waiting_ = true and call on_work_started() to keep | ||
| 76 | the io_context alive | ||
| 77 | |||
| 78 | Locking Protocol | ||
| 79 | ---------------- | ||
| 80 | |||
| 81 | Two mutex levels exist (MUST acquire in this order to avoid deadlock): | ||
| 82 | 1. signal_state::mutex - protects handler registration and service list | ||
| 83 | 2. posix_signals_impl::mutex_ - protects per-service registration tables | ||
| 84 | |||
| 85 | Async-Signal-Safety Limitation | ||
| 86 | ------------------------------ | ||
| 87 | |||
| 88 | IMPORTANT: deliver_signal() is called from signal handler context and | ||
| 89 | acquires mutexes. This is NOT strictly async-signal-safe per POSIX. | ||
| 90 | The limitation: | ||
| 91 | - If a signal arrives while another thread holds state->mutex or | ||
| 92 | service->mutex_, and that same thread receives the signal, a | ||
| 93 | deadlock can occur (self-deadlock on non-recursive mutex). | ||
| 94 | |||
| 95 | This design trades strict async-signal-safety for implementation simplicity. | ||
| 96 | In practice, deadlocks are rare because: | ||
| 97 | - Mutexes are held only briefly during registration changes | ||
| 98 | - Most programs don't modify signal sets while signals are expected | ||
| 99 | - The window for signal arrival during mutex hold is small | ||
| 100 | |||
| 101 | A fully async-signal-safe implementation would require lock-free data | ||
| 102 | structures and atomic operations throughout, significantly increasing | ||
| 103 | complexity. | ||
| 104 | |||
| 105 | Flag Handling | ||
| 106 | ------------- | ||
| 107 | |||
| 108 | - Flags are abstract values in the public API (signal_set::flags_t) | ||
| 109 | - flags_supported() validates that requested flags are available on | ||
| 110 | this platform; returns false if SA_NOCLDWAIT is unavailable and | ||
| 111 | no_child_wait is requested | ||
| 112 | - to_sigaction_flags() maps validated flags to actual SA_* constants | ||
| 113 | - First registration of a signal establishes the flags; subsequent | ||
| 114 | registrations must be compatible (same flags or dont_care) | ||
| 115 | - Requesting unavailable flags returns operation_not_supported | ||
| 116 | |||
| 117 | Work Tracking | ||
| 118 | ------------- | ||
| 119 | |||
| 120 | When waiting for a signal: | ||
| 121 | - start_wait() calls sched_->on_work_started() to prevent io_context::run() | ||
| 122 | from returning while we wait | ||
| 123 | - signal_op::svc is set to point to the service | ||
| 124 | - signal_op::operator()() calls work_finished() after resuming the coroutine | ||
| 125 | |||
| 126 | If a signal was already queued (undelivered > 0), no work tracking is needed | ||
| 127 | because completion is posted immediately. | ||
| 128 | */ | ||
| 129 | |||
| 130 | namespace boost::corosio { | ||
| 131 | |||
| 132 | namespace detail { | ||
| 133 | |||
| 134 | // Forward declarations | ||
| 135 | class posix_signals_impl; | ||
| 136 | |||
| 137 | // Maximum signal number supported (NSIG is typically 64 on Linux) | ||
| 138 | enum { max_signal_number = 64 }; | ||
| 139 | |||
| 140 | //------------------------------------------------------------------------------ | ||
| 141 | // signal_op - pending wait operation | ||
| 142 | //------------------------------------------------------------------------------ | ||
| 143 | |||
| 144 | struct signal_op : scheduler_op | ||
| 145 | { | ||
| 146 | capy::coro h; | ||
| 147 | capy::executor_ref d; | ||
| 148 | std::error_code* ec_out = nullptr; | ||
| 149 | int* signal_out = nullptr; | ||
| 150 | int signal_number = 0; | ||
| 151 | posix_signals_impl* svc = nullptr; // For work_finished callback | ||
| 152 | |||
| 153 | void operator()() override; | ||
| 154 | void destroy() override; | ||
| 155 | }; | ||
| 156 | |||
| 157 | //------------------------------------------------------------------------------ | ||
| 158 | // signal_registration - per-signal registration tracking | ||
| 159 | //------------------------------------------------------------------------------ | ||
| 160 | |||
| 161 | struct signal_registration | ||
| 162 | { | ||
| 163 | int signal_number = 0; | ||
| 164 | signal_set::flags_t flags = signal_set::none; | ||
| 165 | signal_set::signal_set_impl* owner = nullptr; | ||
| 166 | std::size_t undelivered = 0; | ||
| 167 | signal_registration* next_in_table = nullptr; | ||
| 168 | signal_registration* prev_in_table = nullptr; | ||
| 169 | signal_registration* next_in_set = nullptr; | ||
| 170 | }; | ||
| 171 | |||
| 172 | //------------------------------------------------------------------------------ | ||
| 173 | // posix_signal_impl - per-signal_set implementation | ||
| 174 | //------------------------------------------------------------------------------ | ||
| 175 | |||
| 176 | class posix_signal_impl | ||
| 177 | : public signal_set::signal_set_impl | ||
| 178 | , public intrusive_list<posix_signal_impl>::node | ||
| 179 | { | ||
| 180 | friend class posix_signals_impl; | ||
| 181 | |||
| 182 | posix_signals_impl& svc_; | ||
| 183 | signal_registration* signals_ = nullptr; | ||
| 184 | signal_op pending_op_; | ||
| 185 | bool waiting_ = false; | ||
| 186 | |||
| 187 | public: | ||
| 188 | explicit posix_signal_impl(posix_signals_impl& svc) noexcept; | ||
| 189 | |||
| 190 | void release() override; | ||
| 191 | |||
| 192 | void wait( | ||
| 193 | std::coroutine_handle<>, | ||
| 194 | capy::executor_ref, | ||
| 195 | std::stop_token, | ||
| 196 | std::error_code*, | ||
| 197 | int*) override; | ||
| 198 | |||
| 199 | std::error_code add(int signal_number, signal_set::flags_t flags) override; | ||
| 200 | std::error_code remove(int signal_number) override; | ||
| 201 | std::error_code clear() override; | ||
| 202 | void cancel() override; | ||
| 203 | }; | ||
| 204 | |||
| 205 | //------------------------------------------------------------------------------ | ||
| 206 | // posix_signals_impl - concrete service implementation | ||
| 207 | //------------------------------------------------------------------------------ | ||
| 208 | |||
| 209 | class posix_signals_impl : public posix_signals | ||
| 210 | { | ||
| 211 | public: | ||
| 212 | using key_type = posix_signals; | ||
| 213 | |||
| 214 | posix_signals_impl(capy::execution_context& ctx, scheduler& sched); | ||
| 215 | ~posix_signals_impl(); | ||
| 216 | |||
| 217 | posix_signals_impl(posix_signals_impl const&) = delete; | ||
| 218 | posix_signals_impl& operator=(posix_signals_impl const&) = delete; | ||
| 219 | |||
| 220 | void shutdown() override; | ||
| 221 | signal_set::signal_set_impl& create_impl() override; | ||
| 222 | |||
| 223 | void destroy_impl(posix_signal_impl& impl); | ||
| 224 | |||
| 225 | std::error_code add_signal( | ||
| 226 | posix_signal_impl& impl, | ||
| 227 | int signal_number, | ||
| 228 | signal_set::flags_t flags); | ||
| 229 | |||
| 230 | std::error_code remove_signal( | ||
| 231 | posix_signal_impl& impl, | ||
| 232 | int signal_number); | ||
| 233 | |||
| 234 | std::error_code clear_signals(posix_signal_impl& impl); | ||
| 235 | |||
| 236 | void cancel_wait(posix_signal_impl& impl); | ||
| 237 | void start_wait(posix_signal_impl& impl, signal_op* op); | ||
| 238 | |||
| 239 | static void deliver_signal(int signal_number); | ||
| 240 | |||
| 241 | void work_started() noexcept; | ||
| 242 | void work_finished() noexcept; | ||
| 243 | void post(signal_op* op); | ||
| 244 | |||
| 245 | private: | ||
| 246 | static void add_service(posix_signals_impl* service); | ||
| 247 | static void remove_service(posix_signals_impl* service); | ||
| 248 | |||
| 249 | scheduler* sched_; | ||
| 250 | std::mutex mutex_; | ||
| 251 | intrusive_list<posix_signal_impl> impl_list_; | ||
| 252 | |||
| 253 | // Per-signal registration table | ||
| 254 | signal_registration* registrations_[max_signal_number]; | ||
| 255 | |||
| 256 | // Registration counts for each signal | ||
| 257 | std::size_t registration_count_[max_signal_number]; | ||
| 258 | |||
| 259 | // Linked list of all posix_signals_impl services for signal delivery | ||
| 260 | posix_signals_impl* next_ = nullptr; | ||
| 261 | posix_signals_impl* prev_ = nullptr; | ||
| 262 | }; | ||
| 263 | |||
| 264 | //------------------------------------------------------------------------------ | ||
| 265 | // Global signal state | ||
| 266 | //------------------------------------------------------------------------------ | ||
| 267 | |||
| 268 | namespace { | ||
| 269 | |||
| 270 | struct signal_state | ||
| 271 | { | ||
| 272 | std::mutex mutex; | ||
| 273 | posix_signals_impl* service_list = nullptr; | ||
| 274 | std::size_t registration_count[max_signal_number] = {}; | ||
| 275 | signal_set::flags_t registered_flags[max_signal_number] = {}; | ||
| 276 | }; | ||
| 277 | |||
| 278 | 818 | signal_state* get_signal_state() | |
| 279 | { | ||
| 280 | static signal_state state; | ||
| 281 | 818 | return &state; | |
| 282 | } | ||
| 283 | |||
| 284 | // Check if requested flags are supported on this platform. | ||
| 285 | // Returns true if all flags are supported, false otherwise. | ||
| 286 | 94 | bool flags_supported(signal_set::flags_t flags) | |
| 287 | { | ||
| 288 | #ifndef SA_NOCLDWAIT | ||
| 289 | if (flags & signal_set::no_child_wait) | ||
| 290 | return false; | ||
| 291 | #endif | ||
| 292 | 94 | return true; | |
| 293 | } | ||
| 294 | |||
| 295 | // Map abstract flags to sigaction() flags. | ||
| 296 | // Caller must ensure flags_supported() returns true first. | ||
| 297 | 76 | int to_sigaction_flags(signal_set::flags_t flags) | |
| 298 | { | ||
| 299 | 76 | int sa_flags = 0; | |
| 300 |
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76 | if (flags & signal_set::restart) |
| 301 | 18 | sa_flags |= SA_RESTART; | |
| 302 |
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76 | if (flags & signal_set::no_child_stop) |
| 303 | ✗ | sa_flags |= SA_NOCLDSTOP; | |
| 304 | #ifdef SA_NOCLDWAIT | ||
| 305 |
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76 | if (flags & signal_set::no_child_wait) |
| 306 | ✗ | sa_flags |= SA_NOCLDWAIT; | |
| 307 | #endif | ||
| 308 |
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76 | if (flags & signal_set::no_defer) |
| 309 | 2 | sa_flags |= SA_NODEFER; | |
| 310 |
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76 | if (flags & signal_set::reset_handler) |
| 311 | ✗ | sa_flags |= SA_RESETHAND; | |
| 312 | 76 | return sa_flags; | |
| 313 | } | ||
| 314 | |||
| 315 | // Check if two flag values are compatible | ||
| 316 | 18 | bool flags_compatible( | |
| 317 | signal_set::flags_t existing, | ||
| 318 | signal_set::flags_t requested) | ||
| 319 | { | ||
| 320 | // dont_care is always compatible | ||
| 321 |
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34 | if ((existing & signal_set::dont_care) || |
| 322 | 16 | (requested & signal_set::dont_care)) | |
| 323 | 6 | return true; | |
| 324 | |||
| 325 | // Mask out dont_care bit for comparison | ||
| 326 | 12 | constexpr auto mask = ~signal_set::dont_care; | |
| 327 | 12 | return (existing & mask) == (requested & mask); | |
| 328 | } | ||
| 329 | |||
| 330 | // C signal handler - must be async-signal-safe | ||
| 331 | 20 | extern "C" void corosio_posix_signal_handler(int signal_number) | |
| 332 | { | ||
| 333 | 20 | posix_signals_impl::deliver_signal(signal_number); | |
| 334 | // Note: With sigaction(), the handler persists automatically | ||
| 335 | // (unlike some signal() implementations that reset to SIG_DFL) | ||
| 336 | 20 | } | |
| 337 | |||
| 338 | } // namespace | ||
| 339 | |||
| 340 | //------------------------------------------------------------------------------ | ||
| 341 | // signal_op implementation | ||
| 342 | //------------------------------------------------------------------------------ | ||
| 343 | |||
| 344 | void | ||
| 345 | 22 | signal_op:: | |
| 346 | operator()() | ||
| 347 | { | ||
| 348 |
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22 | if (ec_out) |
| 349 | 22 | *ec_out = {}; | |
| 350 |
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22 | if (signal_out) |
| 351 | 22 | *signal_out = signal_number; | |
| 352 | |||
| 353 | // Capture svc before resuming (coro may destroy us) | ||
| 354 | 22 | auto* service = svc; | |
| 355 | 22 | svc = nullptr; | |
| 356 | |||
| 357 | 22 | d.post(h); | |
| 358 | |||
| 359 | // Balance the on_work_started() from start_wait | ||
| 360 |
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22 | if (service) |
| 361 | 12 | service->work_finished(); | |
| 362 | 22 | } | |
| 363 | |||
| 364 | void | ||
| 365 | ✗ | signal_op:: | |
| 366 | destroy() | ||
| 367 | { | ||
| 368 | // No-op: signal_op is embedded in posix_signal_impl | ||
| 369 | ✗ | } | |
| 370 | |||
| 371 | //------------------------------------------------------------------------------ | ||
| 372 | // posix_signal_impl implementation | ||
| 373 | //------------------------------------------------------------------------------ | ||
| 374 | |||
| 375 | 88 | posix_signal_impl:: | |
| 376 | 88 | posix_signal_impl(posix_signals_impl& svc) noexcept | |
| 377 | 88 | : svc_(svc) | |
| 378 | { | ||
| 379 | 88 | } | |
| 380 | |||
| 381 | void | ||
| 382 | 88 | posix_signal_impl:: | |
| 383 | release() | ||
| 384 | { | ||
| 385 | 88 | clear(); | |
| 386 | 88 | cancel(); | |
| 387 | 88 | svc_.destroy_impl(*this); | |
| 388 | 88 | } | |
| 389 | |||
| 390 | void | ||
| 391 | 26 | posix_signal_impl:: | |
| 392 | wait( | ||
| 393 | std::coroutine_handle<> h, | ||
| 394 | capy::executor_ref d, | ||
| 395 | std::stop_token token, | ||
| 396 | std::error_code* ec, | ||
| 397 | int* signal_out) | ||
| 398 | { | ||
| 399 | 26 | pending_op_.h = h; | |
| 400 | 26 | pending_op_.d = d; | |
| 401 | 26 | pending_op_.ec_out = ec; | |
| 402 | 26 | pending_op_.signal_out = signal_out; | |
| 403 | 26 | pending_op_.signal_number = 0; | |
| 404 | |||
| 405 |
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26 | if (token.stop_requested()) |
| 406 | { | ||
| 407 | ✗ | if (ec) | |
| 408 | ✗ | *ec = make_error_code(capy::error::canceled); | |
| 409 | ✗ | if (signal_out) | |
| 410 | ✗ | *signal_out = 0; | |
| 411 | ✗ | d.post(h); | |
| 412 | ✗ | return; | |
| 413 | } | ||
| 414 | |||
| 415 | 26 | svc_.start_wait(*this, &pending_op_); | |
| 416 | } | ||
| 417 | |||
| 418 | std::error_code | ||
| 419 | 96 | posix_signal_impl:: | |
| 420 | add(int signal_number, signal_set::flags_t flags) | ||
| 421 | { | ||
| 422 | 96 | return svc_.add_signal(*this, signal_number, flags); | |
| 423 | } | ||
| 424 | |||
| 425 | std::error_code | ||
| 426 | 4 | posix_signal_impl:: | |
| 427 | remove(int signal_number) | ||
| 428 | { | ||
| 429 | 4 | return svc_.remove_signal(*this, signal_number); | |
| 430 | } | ||
| 431 | |||
| 432 | std::error_code | ||
| 433 | 92 | posix_signal_impl:: | |
| 434 | clear() | ||
| 435 | { | ||
| 436 | 92 | return svc_.clear_signals(*this); | |
| 437 | } | ||
| 438 | |||
| 439 | void | ||
| 440 | 100 | posix_signal_impl:: | |
| 441 | cancel() | ||
| 442 | { | ||
| 443 | 100 | svc_.cancel_wait(*this); | |
| 444 | 100 | } | |
| 445 | |||
| 446 | //------------------------------------------------------------------------------ | ||
| 447 | // posix_signals_impl implementation | ||
| 448 | //------------------------------------------------------------------------------ | ||
| 449 | |||
| 450 | 304 | posix_signals_impl:: | |
| 451 | 304 | posix_signals_impl(capy::execution_context&, scheduler& sched) | |
| 452 | 304 | : sched_(&sched) | |
| 453 | { | ||
| 454 |
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19760 | for (int i = 0; i < max_signal_number; ++i) |
| 455 | { | ||
| 456 | 19456 | registrations_[i] = nullptr; | |
| 457 | 19456 | registration_count_[i] = 0; | |
| 458 | } | ||
| 459 |
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304 | add_service(this); |
| 460 | 304 | } | |
| 461 | |||
| 462 | 608 | posix_signals_impl:: | |
| 463 | 304 | ~posix_signals_impl() | |
| 464 | { | ||
| 465 | 304 | remove_service(this); | |
| 466 | 608 | } | |
| 467 | |||
| 468 | void | ||
| 469 | 304 | posix_signals_impl:: | |
| 470 | shutdown() | ||
| 471 | { | ||
| 472 |
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304 | std::lock_guard lock(mutex_); |
| 473 | |||
| 474 |
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304 | for (auto* impl = impl_list_.pop_front(); impl != nullptr; |
| 475 | ✗ | impl = impl_list_.pop_front()) | |
| 476 | { | ||
| 477 | ✗ | while (auto* reg = impl->signals_) | |
| 478 | { | ||
| 479 | ✗ | impl->signals_ = reg->next_in_set; | |
| 480 | ✗ | delete reg; | |
| 481 | ✗ | } | |
| 482 | ✗ | delete impl; | |
| 483 | } | ||
| 484 | 304 | } | |
| 485 | |||
| 486 | signal_set::signal_set_impl& | ||
| 487 | 88 | posix_signals_impl:: | |
| 488 | create_impl() | ||
| 489 | { | ||
| 490 | 88 | auto* impl = new posix_signal_impl(*this); | |
| 491 | |||
| 492 | { | ||
| 493 |
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88 | std::lock_guard lock(mutex_); |
| 494 | 88 | impl_list_.push_back(impl); | |
| 495 | 88 | } | |
| 496 | |||
| 497 | 88 | return *impl; | |
| 498 | } | ||
| 499 | |||
| 500 | void | ||
| 501 | 88 | posix_signals_impl:: | |
| 502 | destroy_impl(posix_signal_impl& impl) | ||
| 503 | { | ||
| 504 | { | ||
| 505 |
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88 | std::lock_guard lock(mutex_); |
| 506 | 88 | impl_list_.remove(&impl); | |
| 507 | 88 | } | |
| 508 | |||
| 509 |
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88 | delete &impl; |
| 510 | 88 | } | |
| 511 | |||
| 512 | std::error_code | ||
| 513 | 96 | posix_signals_impl:: | |
| 514 | add_signal( | ||
| 515 | posix_signal_impl& impl, | ||
| 516 | int signal_number, | ||
| 517 | signal_set::flags_t flags) | ||
| 518 | { | ||
| 519 |
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96 | if (signal_number < 0 || signal_number >= max_signal_number) |
| 520 | 2 | return make_error_code(std::errc::invalid_argument); | |
| 521 | |||
| 522 | // Validate that requested flags are supported on this platform | ||
| 523 | // (e.g., SA_NOCLDWAIT may not be available on all POSIX systems) | ||
| 524 |
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94 | if (!flags_supported(flags)) |
| 525 | ✗ | return make_error_code(std::errc::operation_not_supported); | |
| 526 | |||
| 527 | 94 | signal_state* state = get_signal_state(); | |
| 528 |
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94 | std::lock_guard state_lock(state->mutex); |
| 529 |
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94 | std::lock_guard lock(mutex_); |
| 530 | |||
| 531 | // Find insertion point (list is sorted by signal number) | ||
| 532 | 94 | signal_registration** insertion_point = &impl.signals_; | |
| 533 | 94 | signal_registration* reg = impl.signals_; | |
| 534 |
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104 | while (reg && reg->signal_number < signal_number) |
| 535 | { | ||
| 536 | 10 | insertion_point = ®->next_in_set; | |
| 537 | 10 | reg = reg->next_in_set; | |
| 538 | } | ||
| 539 | |||
| 540 | // Already registered in this set - check flag compatibility | ||
| 541 | // (same signal_set adding same signal twice with different flags) | ||
| 542 |
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94 | if (reg && reg->signal_number == signal_number) |
| 543 | { | ||
| 544 |
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|
10 | if (!flags_compatible(reg->flags, flags)) |
| 545 | 2 | return make_error_code(std::errc::invalid_argument); | |
| 546 | 8 | return {}; | |
| 547 | } | ||
| 548 | |||
| 549 | // Check flag compatibility with global registration | ||
| 550 | // (different signal_set already registered this signal with different flags) | ||
| 551 |
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84 | if (state->registration_count[signal_number] > 0) |
| 552 | { | ||
| 553 |
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8 | if (!flags_compatible(state->registered_flags[signal_number], flags)) |
| 554 | 2 | return make_error_code(std::errc::invalid_argument); | |
| 555 | } | ||
| 556 | |||
| 557 |
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|
82 | auto* new_reg = new signal_registration; |
| 558 | 82 | new_reg->signal_number = signal_number; | |
| 559 | 82 | new_reg->flags = flags; | |
| 560 | 82 | new_reg->owner = &impl; | |
| 561 | 82 | new_reg->undelivered = 0; | |
| 562 | |||
| 563 | // Install signal handler on first global registration | ||
| 564 |
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82 | if (state->registration_count[signal_number] == 0) |
| 565 | { | ||
| 566 | 76 | struct sigaction sa = {}; | |
| 567 | 76 | sa.sa_handler = corosio_posix_signal_handler; | |
| 568 | 76 | sigemptyset(&sa.sa_mask); | |
| 569 | 76 | sa.sa_flags = to_sigaction_flags(flags); | |
| 570 | |||
| 571 |
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|
76 | if (::sigaction(signal_number, &sa, nullptr) < 0) |
| 572 | { | ||
| 573 | ✗ | delete new_reg; | |
| 574 | ✗ | return make_error_code(std::errc::invalid_argument); | |
| 575 | } | ||
| 576 | |||
| 577 | // Store the flags used for first registration | ||
| 578 | 76 | state->registered_flags[signal_number] = flags; | |
| 579 | } | ||
| 580 | |||
| 581 | 82 | new_reg->next_in_set = reg; | |
| 582 | 82 | *insertion_point = new_reg; | |
| 583 | |||
| 584 | 82 | new_reg->next_in_table = registrations_[signal_number]; | |
| 585 | 82 | new_reg->prev_in_table = nullptr; | |
| 586 |
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82 | if (registrations_[signal_number]) |
| 587 | 6 | registrations_[signal_number]->prev_in_table = new_reg; | |
| 588 | 82 | registrations_[signal_number] = new_reg; | |
| 589 | |||
| 590 | 82 | ++state->registration_count[signal_number]; | |
| 591 | 82 | ++registration_count_[signal_number]; | |
| 592 | |||
| 593 | 82 | return {}; | |
| 594 | 94 | } | |
| 595 | |||
| 596 | std::error_code | ||
| 597 | 4 | posix_signals_impl:: | |
| 598 | remove_signal( | ||
| 599 | posix_signal_impl& impl, | ||
| 600 | int signal_number) | ||
| 601 | { | ||
| 602 |
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4 | if (signal_number < 0 || signal_number >= max_signal_number) |
| 603 | ✗ | return make_error_code(std::errc::invalid_argument); | |
| 604 | |||
| 605 | 4 | signal_state* state = get_signal_state(); | |
| 606 |
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4 | std::lock_guard state_lock(state->mutex); |
| 607 |
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4 | std::lock_guard lock(mutex_); |
| 608 | |||
| 609 | 4 | signal_registration** deletion_point = &impl.signals_; | |
| 610 | 4 | signal_registration* reg = impl.signals_; | |
| 611 |
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4 | while (reg && reg->signal_number < signal_number) |
| 612 | { | ||
| 613 | ✗ | deletion_point = ®->next_in_set; | |
| 614 | ✗ | reg = reg->next_in_set; | |
| 615 | } | ||
| 616 | |||
| 617 |
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4 | if (!reg || reg->signal_number != signal_number) |
| 618 | 2 | return {}; | |
| 619 | |||
| 620 | // Restore default handler on last global unregistration | ||
| 621 |
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2 | if (state->registration_count[signal_number] == 1) |
| 622 | { | ||
| 623 | 2 | struct sigaction sa = {}; | |
| 624 | 2 | sa.sa_handler = SIG_DFL; | |
| 625 | 2 | sigemptyset(&sa.sa_mask); | |
| 626 | 2 | sa.sa_flags = 0; | |
| 627 | |||
| 628 |
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2 | if (::sigaction(signal_number, &sa, nullptr) < 0) |
| 629 | ✗ | return make_error_code(std::errc::invalid_argument); | |
| 630 | |||
| 631 | // Clear stored flags | ||
| 632 | 2 | state->registered_flags[signal_number] = signal_set::none; | |
| 633 | } | ||
| 634 | |||
| 635 | 2 | *deletion_point = reg->next_in_set; | |
| 636 | |||
| 637 |
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2 | if (registrations_[signal_number] == reg) |
| 638 | 2 | registrations_[signal_number] = reg->next_in_table; | |
| 639 |
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2 | if (reg->prev_in_table) |
| 640 | ✗ | reg->prev_in_table->next_in_table = reg->next_in_table; | |
| 641 |
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2 | if (reg->next_in_table) |
| 642 | ✗ | reg->next_in_table->prev_in_table = reg->prev_in_table; | |
| 643 | |||
| 644 | 2 | --state->registration_count[signal_number]; | |
| 645 | 2 | --registration_count_[signal_number]; | |
| 646 | |||
| 647 |
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2 | delete reg; |
| 648 | 2 | return {}; | |
| 649 | 4 | } | |
| 650 | |||
| 651 | std::error_code | ||
| 652 | 92 | posix_signals_impl:: | |
| 653 | clear_signals(posix_signal_impl& impl) | ||
| 654 | { | ||
| 655 | 92 | signal_state* state = get_signal_state(); | |
| 656 |
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92 | std::lock_guard state_lock(state->mutex); |
| 657 |
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92 | std::lock_guard lock(mutex_); |
| 658 | |||
| 659 | 92 | std::error_code first_error; | |
| 660 | |||
| 661 |
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172 | while (signal_registration* reg = impl.signals_) |
| 662 | { | ||
| 663 | 80 | int signal_number = reg->signal_number; | |
| 664 | |||
| 665 |
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80 | if (state->registration_count[signal_number] == 1) |
| 666 | { | ||
| 667 | 74 | struct sigaction sa = {}; | |
| 668 | 74 | sa.sa_handler = SIG_DFL; | |
| 669 | 74 | sigemptyset(&sa.sa_mask); | |
| 670 | 74 | sa.sa_flags = 0; | |
| 671 | |||
| 672 |
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74 | if (::sigaction(signal_number, &sa, nullptr) < 0 && !first_error) |
| 673 | ✗ | first_error = make_error_code(std::errc::invalid_argument); | |
| 674 | |||
| 675 | // Clear stored flags | ||
| 676 | 74 | state->registered_flags[signal_number] = signal_set::none; | |
| 677 | } | ||
| 678 | |||
| 679 | 80 | impl.signals_ = reg->next_in_set; | |
| 680 | |||
| 681 |
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80 | if (registrations_[signal_number] == reg) |
| 682 | 80 | registrations_[signal_number] = reg->next_in_table; | |
| 683 |
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80 | if (reg->prev_in_table) |
| 684 | ✗ | reg->prev_in_table->next_in_table = reg->next_in_table; | |
| 685 |
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80 | if (reg->next_in_table) |
| 686 | 6 | reg->next_in_table->prev_in_table = reg->prev_in_table; | |
| 687 | |||
| 688 | 80 | --state->registration_count[signal_number]; | |
| 689 | 80 | --registration_count_[signal_number]; | |
| 690 | |||
| 691 |
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80 | delete reg; |
| 692 | 80 | } | |
| 693 | |||
| 694 |
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92 | if (first_error) |
| 695 | ✗ | return first_error; | |
| 696 | 92 | return {}; | |
| 697 | 92 | } | |
| 698 | |||
| 699 | void | ||
| 700 | 100 | posix_signals_impl:: | |
| 701 | cancel_wait(posix_signal_impl& impl) | ||
| 702 | { | ||
| 703 | 100 | bool was_waiting = false; | |
| 704 | 100 | signal_op* op = nullptr; | |
| 705 | |||
| 706 | { | ||
| 707 |
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100 | std::lock_guard lock(mutex_); |
| 708 |
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100 | if (impl.waiting_) |
| 709 | { | ||
| 710 | 4 | was_waiting = true; | |
| 711 | 4 | impl.waiting_ = false; | |
| 712 | 4 | op = &impl.pending_op_; | |
| 713 | } | ||
| 714 | 100 | } | |
| 715 | |||
| 716 |
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100 | if (was_waiting) |
| 717 | { | ||
| 718 |
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4 | if (op->ec_out) |
| 719 | 4 | *op->ec_out = make_error_code(capy::error::canceled); | |
| 720 |
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4 | if (op->signal_out) |
| 721 | 4 | *op->signal_out = 0; | |
| 722 | 4 | op->d.post(op->h); | |
| 723 | 4 | sched_->on_work_finished(); | |
| 724 | } | ||
| 725 | 100 | } | |
| 726 | |||
| 727 | void | ||
| 728 | 26 | posix_signals_impl:: | |
| 729 | start_wait(posix_signal_impl& impl, signal_op* op) | ||
| 730 | { | ||
| 731 | { | ||
| 732 |
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26 | std::lock_guard lock(mutex_); |
| 733 | |||
| 734 | // Check for queued signals first (signal arrived before wait started) | ||
| 735 | 26 | signal_registration* reg = impl.signals_; | |
| 736 |
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44 | while (reg) |
| 737 | { | ||
| 738 |
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28 | if (reg->undelivered > 0) |
| 739 | { | ||
| 740 | 10 | --reg->undelivered; | |
| 741 | 10 | op->signal_number = reg->signal_number; | |
| 742 | // svc=nullptr: no work_finished needed since we never called work_started | ||
| 743 | 10 | op->svc = nullptr; | |
| 744 |
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10 | sched_->post(op); |
| 745 | 10 | return; | |
| 746 | } | ||
| 747 | 18 | reg = reg->next_in_set; | |
| 748 | } | ||
| 749 | |||
| 750 | // No queued signals - wait for delivery | ||
| 751 | 16 | impl.waiting_ = true; | |
| 752 | // svc=this: signal_op::operator() will call work_finished() to balance this | ||
| 753 | 16 | op->svc = this; | |
| 754 | 16 | sched_->on_work_started(); | |
| 755 | 26 | } | |
| 756 | } | ||
| 757 | |||
| 758 | void | ||
| 759 | 20 | posix_signals_impl:: | |
| 760 | deliver_signal(int signal_number) | ||
| 761 | { | ||
| 762 |
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20 | if (signal_number < 0 || signal_number >= max_signal_number) |
| 763 | ✗ | return; | |
| 764 | |||
| 765 | 20 | signal_state* state = get_signal_state(); | |
| 766 |
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20 | std::lock_guard lock(state->mutex); |
| 767 | |||
| 768 | 20 | posix_signals_impl* service = state->service_list; | |
| 769 |
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40 | while (service) |
| 770 | { | ||
| 771 |
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20 | std::lock_guard svc_lock(service->mutex_); |
| 772 | |||
| 773 | 20 | signal_registration* reg = service->registrations_[signal_number]; | |
| 774 |
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42 | while (reg) |
| 775 | { | ||
| 776 | 22 | posix_signal_impl* impl = static_cast<posix_signal_impl*>(reg->owner); | |
| 777 | |||
| 778 |
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22 | if (impl->waiting_) |
| 779 | { | ||
| 780 | 12 | impl->waiting_ = false; | |
| 781 | 12 | impl->pending_op_.signal_number = signal_number; | |
| 782 |
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12 | service->post(&impl->pending_op_); |
| 783 | } | ||
| 784 | else | ||
| 785 | { | ||
| 786 | 10 | ++reg->undelivered; | |
| 787 | } | ||
| 788 | |||
| 789 | 22 | reg = reg->next_in_table; | |
| 790 | } | ||
| 791 | |||
| 792 | 20 | service = service->next_; | |
| 793 | 20 | } | |
| 794 | 20 | } | |
| 795 | |||
| 796 | void | ||
| 797 | ✗ | posix_signals_impl:: | |
| 798 | work_started() noexcept | ||
| 799 | { | ||
| 800 | ✗ | sched_->work_started(); | |
| 801 | ✗ | } | |
| 802 | |||
| 803 | void | ||
| 804 | 12 | posix_signals_impl:: | |
| 805 | work_finished() noexcept | ||
| 806 | { | ||
| 807 | 12 | sched_->work_finished(); | |
| 808 | 12 | } | |
| 809 | |||
| 810 | void | ||
| 811 | 12 | posix_signals_impl:: | |
| 812 | post(signal_op* op) | ||
| 813 | { | ||
| 814 | 12 | sched_->post(op); | |
| 815 | 12 | } | |
| 816 | |||
| 817 | void | ||
| 818 | 304 | posix_signals_impl:: | |
| 819 | add_service(posix_signals_impl* service) | ||
| 820 | { | ||
| 821 | 304 | signal_state* state = get_signal_state(); | |
| 822 |
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304 | std::lock_guard lock(state->mutex); |
| 823 | |||
| 824 | 304 | service->next_ = state->service_list; | |
| 825 | 304 | service->prev_ = nullptr; | |
| 826 |
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304 | if (state->service_list) |
| 827 | 5 | state->service_list->prev_ = service; | |
| 828 | 304 | state->service_list = service; | |
| 829 | 304 | } | |
| 830 | |||
| 831 | void | ||
| 832 | 304 | posix_signals_impl:: | |
| 833 | remove_service(posix_signals_impl* service) | ||
| 834 | { | ||
| 835 | 304 | signal_state* state = get_signal_state(); | |
| 836 |
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304 | std::lock_guard lock(state->mutex); |
| 837 | |||
| 838 |
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304 | if (service->next_ || service->prev_ || state->service_list == service) |
| 839 | { | ||
| 840 |
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304 | if (state->service_list == service) |
| 841 | 304 | state->service_list = service->next_; | |
| 842 |
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304 | if (service->prev_) |
| 843 | ✗ | service->prev_->next_ = service->next_; | |
| 844 |
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304 | if (service->next_) |
| 845 | 5 | service->next_->prev_ = service->prev_; | |
| 846 | 304 | service->next_ = nullptr; | |
| 847 | 304 | service->prev_ = nullptr; | |
| 848 | } | ||
| 849 | 304 | } | |
| 850 | |||
| 851 | //------------------------------------------------------------------------------ | ||
| 852 | // get_signal_service - factory function | ||
| 853 | //------------------------------------------------------------------------------ | ||
| 854 | |||
| 855 | posix_signals& | ||
| 856 | 304 | get_signal_service(capy::execution_context& ctx, scheduler& sched) | |
| 857 | { | ||
| 858 | 304 | return ctx.make_service<posix_signals_impl>(sched); | |
| 859 | } | ||
| 860 | |||
| 861 | } // namespace detail | ||
| 862 | |||
| 863 | //------------------------------------------------------------------------------ | ||
| 864 | // signal_set implementation | ||
| 865 | //------------------------------------------------------------------------------ | ||
| 866 | |||
| 867 | 90 | signal_set:: | |
| 868 | 90 | ~signal_set() | |
| 869 | { | ||
| 870 |
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90 | if (impl_) |
| 871 | 86 | impl_->release(); | |
| 872 | 90 | } | |
| 873 | |||
| 874 | 88 | signal_set:: | |
| 875 | 88 | signal_set(capy::execution_context& ctx) | |
| 876 | 88 | : io_object(ctx) | |
| 877 | { | ||
| 878 | 88 | auto* svc = ctx.find_service<detail::posix_signals>(); | |
| 879 |
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88 | if (!svc) |
| 880 | ✗ | detail::throw_logic_error("signal_set: signal service not initialized"); | |
| 881 |
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88 | impl_ = &svc->create_impl(); |
| 882 | 88 | } | |
| 883 | |||
| 884 | 2 | signal_set:: | |
| 885 | 2 | signal_set(signal_set&& other) noexcept | |
| 886 | 2 | : io_object(std::move(other)) | |
| 887 | { | ||
| 888 | 2 | impl_ = other.impl_; | |
| 889 | 2 | other.impl_ = nullptr; | |
| 890 | 2 | } | |
| 891 | |||
| 892 | signal_set& | ||
| 893 | 4 | signal_set:: | |
| 894 | operator=(signal_set&& other) | ||
| 895 | { | ||
| 896 |
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4 | if (this != &other) |
| 897 | { | ||
| 898 |
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4 | if (ctx_ != other.ctx_) |
| 899 | 2 | detail::throw_logic_error("signal_set::operator=: context mismatch"); | |
| 900 | |||
| 901 |
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2 | if (impl_) |
| 902 | 2 | impl_->release(); | |
| 903 | |||
| 904 | 2 | impl_ = other.impl_; | |
| 905 | 2 | other.impl_ = nullptr; | |
| 906 | } | ||
| 907 | 2 | return *this; | |
| 908 | } | ||
| 909 | |||
| 910 | std::error_code | ||
| 911 | 96 | signal_set:: | |
| 912 | add(int signal_number, flags_t flags) | ||
| 913 | { | ||
| 914 | 96 | return get().add(signal_number, flags); | |
| 915 | } | ||
| 916 | |||
| 917 | std::error_code | ||
| 918 | 4 | signal_set:: | |
| 919 | remove(int signal_number) | ||
| 920 | { | ||
| 921 | 4 | return get().remove(signal_number); | |
| 922 | } | ||
| 923 | |||
| 924 | std::error_code | ||
| 925 | 4 | signal_set:: | |
| 926 | clear() | ||
| 927 | { | ||
| 928 | 4 | return get().clear(); | |
| 929 | } | ||
| 930 | |||
| 931 | void | ||
| 932 | 12 | signal_set:: | |
| 933 | cancel() | ||
| 934 | { | ||
| 935 | 12 | get().cancel(); | |
| 936 | 12 | } | |
| 937 | |||
| 938 | } // namespace boost::corosio | ||
| 939 | |||
| 940 | #endif // BOOST_COROSIO_POSIX | ||
| 941 |