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/ex/executor_ref.hpp> | ||
| 19 | #include <boost/capy/error.hpp> | ||
| 20 | #include <system_error> | ||
| 21 | |||
| 22 | #include "src/detail/intrusive.hpp" | ||
| 23 | #include "src/detail/scheduler_op.hpp" | ||
| 24 | |||
| 25 | #include <coroutine> | ||
| 26 | #include <cstddef> | ||
| 27 | #include <mutex> | ||
| 28 | #include <stop_token> | ||
| 29 | |||
| 30 | #include <signal.h> | ||
| 31 | |||
| 32 | /* | ||
| 33 | POSIX Signal Implementation | ||
| 34 | =========================== | ||
| 35 | |||
| 36 | This file implements signal handling for POSIX systems using sigaction(). | ||
| 37 | The implementation supports signal flags (SA_RESTART, etc.) and integrates | ||
| 38 | with any POSIX-compatible scheduler via the abstract scheduler interface. | ||
| 39 | |||
| 40 | Architecture Overview | ||
| 41 | --------------------- | ||
| 42 | |||
| 43 | Three layers manage signal registrations: | ||
| 44 | |||
| 45 | 1. signal_state (global singleton) | ||
| 46 | - Tracks the global service list and per-signal registration counts | ||
| 47 | - Stores the flags used for first registration of each signal (for | ||
| 48 | conflict detection when multiple signal_sets register same signal) | ||
| 49 | - Owns the mutex that protects signal handler installation/removal | ||
| 50 | |||
| 51 | 2. posix_signals_impl (one per execution_context) | ||
| 52 | - Maintains registrations_[] table indexed by signal number | ||
| 53 | - Each slot is a doubly-linked list of signal_registrations for that signal | ||
| 54 | - Also maintains impl_list_ of all posix_signal_impl objects it owns | ||
| 55 | |||
| 56 | 3. posix_signal_impl (one per signal_set) | ||
| 57 | - Owns a singly-linked list (sorted by signal number) of signal_registrations | ||
| 58 | - Contains the pending_op_ used for wait operations | ||
| 59 | |||
| 60 | Signal Delivery Flow | ||
| 61 | -------------------- | ||
| 62 | |||
| 63 | 1. Signal arrives -> corosio_posix_signal_handler() (must be async-signal-safe) | ||
| 64 | -> deliver_signal() | ||
| 65 | |||
| 66 | 2. deliver_signal() iterates all posix_signals_impl services: | ||
| 67 | - If a signal_set is waiting (impl->waiting_ == true), post the signal_op | ||
| 68 | to the scheduler for immediate completion | ||
| 69 | - Otherwise, increment reg->undelivered to queue the signal | ||
| 70 | |||
| 71 | 3. When wait() is called via start_wait(): | ||
| 72 | - First check for queued signals (undelivered > 0); if found, post | ||
| 73 | immediate completion without blocking | ||
| 74 | - Otherwise, set waiting_ = true and call on_work_started() to keep | ||
| 75 | the io_context alive | ||
| 76 | |||
| 77 | Locking Protocol | ||
| 78 | ---------------- | ||
| 79 | |||
| 80 | Two mutex levels exist (MUST acquire in this order to avoid deadlock): | ||
| 81 | 1. signal_state::mutex - protects handler registration and service list | ||
| 82 | 2. posix_signals_impl::mutex_ - protects per-service registration tables | ||
| 83 | |||
| 84 | Async-Signal-Safety Limitation | ||
| 85 | ------------------------------ | ||
| 86 | |||
| 87 | IMPORTANT: deliver_signal() is called from signal handler context and | ||
| 88 | acquires mutexes. This is NOT strictly async-signal-safe per POSIX. | ||
| 89 | The limitation: | ||
| 90 | - If a signal arrives while another thread holds state->mutex or | ||
| 91 | service->mutex_, and that same thread receives the signal, a | ||
| 92 | deadlock can occur (self-deadlock on non-recursive mutex). | ||
| 93 | |||
| 94 | This design trades strict async-signal-safety for implementation simplicity. | ||
| 95 | In practice, deadlocks are rare because: | ||
| 96 | - Mutexes are held only briefly during registration changes | ||
| 97 | - Most programs don't modify signal sets while signals are expected | ||
| 98 | - The window for signal arrival during mutex hold is small | ||
| 99 | |||
| 100 | A fully async-signal-safe implementation would require lock-free data | ||
| 101 | structures and atomic operations throughout, significantly increasing | ||
| 102 | complexity. | ||
| 103 | |||
| 104 | Flag Handling | ||
| 105 | ------------- | ||
| 106 | |||
| 107 | - Flags are abstract values in the public API (signal_set::flags_t) | ||
| 108 | - flags_supported() validates that requested flags are available on | ||
| 109 | this platform; returns false if SA_NOCLDWAIT is unavailable and | ||
| 110 | no_child_wait is requested | ||
| 111 | - to_sigaction_flags() maps validated flags to actual SA_* constants | ||
| 112 | - First registration of a signal establishes the flags; subsequent | ||
| 113 | registrations must be compatible (same flags or dont_care) | ||
| 114 | - Requesting unavailable flags returns operation_not_supported | ||
| 115 | |||
| 116 | Work Tracking | ||
| 117 | ------------- | ||
| 118 | |||
| 119 | When waiting for a signal: | ||
| 120 | - start_wait() calls sched_->on_work_started() to prevent io_context::run() | ||
| 121 | from returning while we wait | ||
| 122 | - signal_op::svc is set to point to the service | ||
| 123 | - signal_op::operator()() calls work_finished() after resuming the coroutine | ||
| 124 | |||
| 125 | If a signal was already queued (undelivered > 0), no work tracking is needed | ||
| 126 | because completion is posted immediately. | ||
| 127 | */ | ||
| 128 | |||
| 129 | namespace boost::corosio { | ||
| 130 | |||
| 131 | namespace detail { | ||
| 132 | |||
| 133 | // Forward declarations | ||
| 134 | class posix_signals_impl; | ||
| 135 | |||
| 136 | // Maximum signal number supported (NSIG is typically 64 on Linux) | ||
| 137 | enum { max_signal_number = 64 }; | ||
| 138 | |||
| 139 | //------------------------------------------------------------------------------ | ||
| 140 | // signal_op - pending wait operation | ||
| 141 | //------------------------------------------------------------------------------ | ||
| 142 | |||
| 143 | struct signal_op : scheduler_op | ||
| 144 | { | ||
| 145 | std::coroutine_handle<> h; | ||
| 146 | capy::executor_ref d; | ||
| 147 | std::error_code* ec_out = nullptr; | ||
| 148 | int* signal_out = nullptr; | ||
| 149 | int signal_number = 0; | ||
| 150 | posix_signals_impl* svc = nullptr; // For work_finished callback | ||
| 151 | |||
| 152 | void operator()() override; | ||
| 153 | void destroy() override; | ||
| 154 | }; | ||
| 155 | |||
| 156 | //------------------------------------------------------------------------------ | ||
| 157 | // signal_registration - per-signal registration tracking | ||
| 158 | //------------------------------------------------------------------------------ | ||
| 159 | |||
| 160 | struct signal_registration | ||
| 161 | { | ||
| 162 | int signal_number = 0; | ||
| 163 | signal_set::flags_t flags = signal_set::none; | ||
| 164 | signal_set::signal_set_impl* owner = nullptr; | ||
| 165 | std::size_t undelivered = 0; | ||
| 166 | signal_registration* next_in_table = nullptr; | ||
| 167 | signal_registration* prev_in_table = nullptr; | ||
| 168 | signal_registration* next_in_set = nullptr; | ||
| 169 | }; | ||
| 170 | |||
| 171 | //------------------------------------------------------------------------------ | ||
| 172 | // posix_signal_impl - per-signal_set implementation | ||
| 173 | //------------------------------------------------------------------------------ | ||
| 174 | |||
| 175 | class posix_signal_impl | ||
| 176 | : public signal_set::signal_set_impl | ||
| 177 | , public intrusive_list<posix_signal_impl>::node | ||
| 178 | { | ||
| 179 | friend class posix_signals_impl; | ||
| 180 | |||
| 181 | posix_signals_impl& svc_; | ||
| 182 | signal_registration* signals_ = nullptr; | ||
| 183 | signal_op pending_op_; | ||
| 184 | bool waiting_ = false; | ||
| 185 | |||
| 186 | public: | ||
| 187 | explicit posix_signal_impl(posix_signals_impl& svc) noexcept; | ||
| 188 | |||
| 189 | void release() override; | ||
| 190 | |||
| 191 | std::coroutine_handle<> wait( | ||
| 192 | std::coroutine_handle<>, | ||
| 193 | capy::executor_ref, | ||
| 194 | std::stop_token, | ||
| 195 | std::error_code*, | ||
| 196 | int*) override; | ||
| 197 | |||
| 198 | std::error_code add(int signal_number, signal_set::flags_t flags) override; | ||
| 199 | std::error_code remove(int signal_number) override; | ||
| 200 | std::error_code clear() override; | ||
| 201 | void cancel() override; | ||
| 202 | }; | ||
| 203 | |||
| 204 | //------------------------------------------------------------------------------ | ||
| 205 | // posix_signals_impl - concrete service implementation | ||
| 206 | //------------------------------------------------------------------------------ | ||
| 207 | |||
| 208 | class posix_signals_impl : public posix_signals | ||
| 209 | { | ||
| 210 | public: | ||
| 211 | using key_type = posix_signals; | ||
| 212 | |||
| 213 | posix_signals_impl(capy::execution_context& ctx, scheduler& sched); | ||
| 214 | ~posix_signals_impl(); | ||
| 215 | |||
| 216 | posix_signals_impl(posix_signals_impl const&) = delete; | ||
| 217 | posix_signals_impl& operator=(posix_signals_impl const&) = delete; | ||
| 218 | |||
| 219 | void shutdown() override; | ||
| 220 | signal_set::signal_set_impl& create_impl() override; | ||
| 221 | |||
| 222 | void destroy_impl(posix_signal_impl& impl); | ||
| 223 | |||
| 224 | std::error_code add_signal( | ||
| 225 | posix_signal_impl& impl, | ||
| 226 | int signal_number, | ||
| 227 | signal_set::flags_t flags); | ||
| 228 | |||
| 229 | std::error_code remove_signal( | ||
| 230 | posix_signal_impl& impl, | ||
| 231 | int signal_number); | ||
| 232 | |||
| 233 | std::error_code clear_signals(posix_signal_impl& impl); | ||
| 234 | |||
| 235 | void cancel_wait(posix_signal_impl& impl); | ||
| 236 | void start_wait(posix_signal_impl& impl, signal_op* op); | ||
| 237 | |||
| 238 | static void deliver_signal(int signal_number); | ||
| 239 | |||
| 240 | void work_started() noexcept; | ||
| 241 | void work_finished() noexcept; | ||
| 242 | void post(signal_op* op); | ||
| 243 | |||
| 244 | private: | ||
| 245 | static void add_service(posix_signals_impl* service); | ||
| 246 | static void remove_service(posix_signals_impl* service); | ||
| 247 | |||
| 248 | scheduler* sched_; | ||
| 249 | std::mutex mutex_; | ||
| 250 | intrusive_list<posix_signal_impl> impl_list_; | ||
| 251 | |||
| 252 | // Per-signal registration table | ||
| 253 | signal_registration* registrations_[max_signal_number]; | ||
| 254 | |||
| 255 | // Registration counts for each signal | ||
| 256 | std::size_t registration_count_[max_signal_number]; | ||
| 257 | |||
| 258 | // Linked list of all posix_signals_impl services for signal delivery | ||
| 259 | posix_signals_impl* next_ = nullptr; | ||
| 260 | posix_signals_impl* prev_ = nullptr; | ||
| 261 | }; | ||
| 262 | |||
| 263 | //------------------------------------------------------------------------------ | ||
| 264 | // Global signal state | ||
| 265 | //------------------------------------------------------------------------------ | ||
| 266 | |||
| 267 | namespace { | ||
| 268 | |||
| 269 | struct signal_state | ||
| 270 | { | ||
| 271 | std::mutex mutex; | ||
| 272 | posix_signals_impl* service_list = nullptr; | ||
| 273 | std::size_t registration_count[max_signal_number] = {}; | ||
| 274 | signal_set::flags_t registered_flags[max_signal_number] = {}; | ||
| 275 | }; | ||
| 276 | |||
| 277 | 882 | signal_state* get_signal_state() | |
| 278 | { | ||
| 279 | static signal_state state; | ||
| 280 | 882 | return &state; | |
| 281 | } | ||
| 282 | |||
| 283 | // Check if requested flags are supported on this platform. | ||
| 284 | // Returns true if all flags are supported, false otherwise. | ||
| 285 | 94 | bool flags_supported(signal_set::flags_t flags) | |
| 286 | { | ||
| 287 | #ifndef SA_NOCLDWAIT | ||
| 288 | if (flags & signal_set::no_child_wait) | ||
| 289 | return false; | ||
| 290 | #endif | ||
| 291 | 94 | return true; | |
| 292 | } | ||
| 293 | |||
| 294 | // Map abstract flags to sigaction() flags. | ||
| 295 | // Caller must ensure flags_supported() returns true first. | ||
| 296 | 76 | int to_sigaction_flags(signal_set::flags_t flags) | |
| 297 | { | ||
| 298 | 76 | int sa_flags = 0; | |
| 299 |
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76 | if (flags & signal_set::restart) |
| 300 | 18 | sa_flags |= SA_RESTART; | |
| 301 |
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76 | if (flags & signal_set::no_child_stop) |
| 302 | ✗ | sa_flags |= SA_NOCLDSTOP; | |
| 303 | #ifdef SA_NOCLDWAIT | ||
| 304 |
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76 | if (flags & signal_set::no_child_wait) |
| 305 | ✗ | sa_flags |= SA_NOCLDWAIT; | |
| 306 | #endif | ||
| 307 |
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76 | if (flags & signal_set::no_defer) |
| 308 | 2 | sa_flags |= SA_NODEFER; | |
| 309 |
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76 | if (flags & signal_set::reset_handler) |
| 310 | ✗ | sa_flags |= SA_RESETHAND; | |
| 311 | 76 | return sa_flags; | |
| 312 | } | ||
| 313 | |||
| 314 | // Check if two flag values are compatible | ||
| 315 | 18 | bool flags_compatible( | |
| 316 | signal_set::flags_t existing, | ||
| 317 | signal_set::flags_t requested) | ||
| 318 | { | ||
| 319 | // dont_care is always compatible | ||
| 320 |
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34 | if ((existing & signal_set::dont_care) || |
| 321 | 16 | (requested & signal_set::dont_care)) | |
| 322 | 6 | return true; | |
| 323 | |||
| 324 | // Mask out dont_care bit for comparison | ||
| 325 | 12 | constexpr auto mask = ~signal_set::dont_care; | |
| 326 | 12 | return (existing & mask) == (requested & mask); | |
| 327 | } | ||
| 328 | |||
| 329 | // C signal handler - must be async-signal-safe | ||
| 330 | 20 | extern "C" void corosio_posix_signal_handler(int signal_number) | |
| 331 | { | ||
| 332 | 20 | posix_signals_impl::deliver_signal(signal_number); | |
| 333 | // Note: With sigaction(), the handler persists automatically | ||
| 334 | // (unlike some signal() implementations that reset to SIG_DFL) | ||
| 335 | 20 | } | |
| 336 | |||
| 337 | } // namespace | ||
| 338 | |||
| 339 | //------------------------------------------------------------------------------ | ||
| 340 | // signal_op implementation | ||
| 341 | //------------------------------------------------------------------------------ | ||
| 342 | |||
| 343 | void | ||
| 344 | 22 | signal_op:: | |
| 345 | operator()() | ||
| 346 | { | ||
| 347 |
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22 | if (ec_out) |
| 348 | 22 | *ec_out = {}; | |
| 349 |
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22 | if (signal_out) |
| 350 | 22 | *signal_out = signal_number; | |
| 351 | |||
| 352 | // Capture svc before resuming (coro may destroy us) | ||
| 353 | 22 | auto* service = svc; | |
| 354 | 22 | svc = nullptr; | |
| 355 | |||
| 356 | 22 | d.post(h); | |
| 357 | |||
| 358 | // Balance the on_work_started() from start_wait | ||
| 359 |
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22 | if (service) |
| 360 | 12 | service->work_finished(); | |
| 361 | 22 | } | |
| 362 | |||
| 363 | void | ||
| 364 | ✗ | signal_op:: | |
| 365 | destroy() | ||
| 366 | { | ||
| 367 | // No-op: signal_op is embedded in posix_signal_impl | ||
| 368 | ✗ | } | |
| 369 | |||
| 370 | //------------------------------------------------------------------------------ | ||
| 371 | // posix_signal_impl implementation | ||
| 372 | //------------------------------------------------------------------------------ | ||
| 373 | |||
| 374 | 88 | posix_signal_impl:: | |
| 375 | 88 | posix_signal_impl(posix_signals_impl& svc) noexcept | |
| 376 | 88 | : svc_(svc) | |
| 377 | { | ||
| 378 | 88 | } | |
| 379 | |||
| 380 | void | ||
| 381 | 88 | posix_signal_impl:: | |
| 382 | release() | ||
| 383 | { | ||
| 384 | 88 | clear(); | |
| 385 | 88 | cancel(); | |
| 386 | 88 | svc_.destroy_impl(*this); | |
| 387 | 88 | } | |
| 388 | |||
| 389 | std::coroutine_handle<> | ||
| 390 | 26 | posix_signal_impl:: | |
| 391 | wait( | ||
| 392 | std::coroutine_handle<> h, | ||
| 393 | capy::executor_ref d, | ||
| 394 | std::stop_token token, | ||
| 395 | std::error_code* ec, | ||
| 396 | int* signal_out) | ||
| 397 | { | ||
| 398 | 26 | pending_op_.h = h; | |
| 399 | 26 | pending_op_.d = d; | |
| 400 | 26 | pending_op_.ec_out = ec; | |
| 401 | 26 | pending_op_.signal_out = signal_out; | |
| 402 | 26 | pending_op_.signal_number = 0; | |
| 403 | |||
| 404 |
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26 | if (token.stop_requested()) |
| 405 | { | ||
| 406 | ✗ | if (ec) | |
| 407 | ✗ | *ec = make_error_code(capy::error::canceled); | |
| 408 | ✗ | if (signal_out) | |
| 409 | ✗ | *signal_out = 0; | |
| 410 | ✗ | d.post(h); | |
| 411 | // completion is always posted to scheduler queue, never inline. | ||
| 412 | ✗ | return std::noop_coroutine(); | |
| 413 | } | ||
| 414 | |||
| 415 | 26 | svc_.start_wait(*this, &pending_op_); | |
| 416 | // completion is always posted to scheduler queue, never inline. | ||
| 417 | 26 | return std::noop_coroutine(); | |
| 418 | } | ||
| 419 | |||
| 420 | std::error_code | ||
| 421 | 96 | posix_signal_impl:: | |
| 422 | add(int signal_number, signal_set::flags_t flags) | ||
| 423 | { | ||
| 424 | 96 | return svc_.add_signal(*this, signal_number, flags); | |
| 425 | } | ||
| 426 | |||
| 427 | std::error_code | ||
| 428 | 4 | posix_signal_impl:: | |
| 429 | remove(int signal_number) | ||
| 430 | { | ||
| 431 | 4 | return svc_.remove_signal(*this, signal_number); | |
| 432 | } | ||
| 433 | |||
| 434 | std::error_code | ||
| 435 | 92 | posix_signal_impl:: | |
| 436 | clear() | ||
| 437 | { | ||
| 438 | 92 | return svc_.clear_signals(*this); | |
| 439 | } | ||
| 440 | |||
| 441 | void | ||
| 442 | 100 | posix_signal_impl:: | |
| 443 | cancel() | ||
| 444 | { | ||
| 445 | 100 | svc_.cancel_wait(*this); | |
| 446 | 100 | } | |
| 447 | |||
| 448 | //------------------------------------------------------------------------------ | ||
| 449 | // posix_signals_impl implementation | ||
| 450 | //------------------------------------------------------------------------------ | ||
| 451 | |||
| 452 | 336 | posix_signals_impl:: | |
| 453 | 336 | posix_signals_impl(capy::execution_context&, scheduler& sched) | |
| 454 | 336 | : sched_(&sched) | |
| 455 | { | ||
| 456 |
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21840 | for (int i = 0; i < max_signal_number; ++i) |
| 457 | { | ||
| 458 | 21504 | registrations_[i] = nullptr; | |
| 459 | 21504 | registration_count_[i] = 0; | |
| 460 | } | ||
| 461 |
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336 | add_service(this); |
| 462 | 336 | } | |
| 463 | |||
| 464 | 672 | posix_signals_impl:: | |
| 465 | 336 | ~posix_signals_impl() | |
| 466 | { | ||
| 467 | 336 | remove_service(this); | |
| 468 | 672 | } | |
| 469 | |||
| 470 | void | ||
| 471 | 336 | posix_signals_impl:: | |
| 472 | shutdown() | ||
| 473 | { | ||
| 474 |
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336 | std::lock_guard lock(mutex_); |
| 475 | |||
| 476 |
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336 | for (auto* impl = impl_list_.pop_front(); impl != nullptr; |
| 477 | ✗ | impl = impl_list_.pop_front()) | |
| 478 | { | ||
| 479 | ✗ | while (auto* reg = impl->signals_) | |
| 480 | { | ||
| 481 | ✗ | impl->signals_ = reg->next_in_set; | |
| 482 | ✗ | delete reg; | |
| 483 | ✗ | } | |
| 484 | ✗ | delete impl; | |
| 485 | } | ||
| 486 | 336 | } | |
| 487 | |||
| 488 | signal_set::signal_set_impl& | ||
| 489 | 88 | posix_signals_impl:: | |
| 490 | create_impl() | ||
| 491 | { | ||
| 492 | 88 | auto* impl = new posix_signal_impl(*this); | |
| 493 | |||
| 494 | { | ||
| 495 |
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88 | std::lock_guard lock(mutex_); |
| 496 | 88 | impl_list_.push_back(impl); | |
| 497 | 88 | } | |
| 498 | |||
| 499 | 88 | return *impl; | |
| 500 | } | ||
| 501 | |||
| 502 | void | ||
| 503 | 88 | posix_signals_impl:: | |
| 504 | destroy_impl(posix_signal_impl& impl) | ||
| 505 | { | ||
| 506 | { | ||
| 507 |
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88 | std::lock_guard lock(mutex_); |
| 508 | 88 | impl_list_.remove(&impl); | |
| 509 | 88 | } | |
| 510 | |||
| 511 |
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88 | delete &impl; |
| 512 | 88 | } | |
| 513 | |||
| 514 | std::error_code | ||
| 515 | 96 | posix_signals_impl:: | |
| 516 | add_signal( | ||
| 517 | posix_signal_impl& impl, | ||
| 518 | int signal_number, | ||
| 519 | signal_set::flags_t flags) | ||
| 520 | { | ||
| 521 |
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96 | if (signal_number < 0 || signal_number >= max_signal_number) |
| 522 | 2 | return make_error_code(std::errc::invalid_argument); | |
| 523 | |||
| 524 | // Validate that requested flags are supported on this platform | ||
| 525 | // (e.g., SA_NOCLDWAIT may not be available on all POSIX systems) | ||
| 526 |
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94 | if (!flags_supported(flags)) |
| 527 | ✗ | return make_error_code(std::errc::operation_not_supported); | |
| 528 | |||
| 529 | 94 | signal_state* state = get_signal_state(); | |
| 530 |
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94 | std::lock_guard state_lock(state->mutex); |
| 531 |
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94 | std::lock_guard lock(mutex_); |
| 532 | |||
| 533 | // Find insertion point (list is sorted by signal number) | ||
| 534 | 94 | signal_registration** insertion_point = &impl.signals_; | |
| 535 | 94 | signal_registration* reg = impl.signals_; | |
| 536 |
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104 | while (reg && reg->signal_number < signal_number) |
| 537 | { | ||
| 538 | 10 | insertion_point = ®->next_in_set; | |
| 539 | 10 | reg = reg->next_in_set; | |
| 540 | } | ||
| 541 | |||
| 542 | // Already registered in this set - check flag compatibility | ||
| 543 | // (same signal_set adding same signal twice with different flags) | ||
| 544 |
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94 | if (reg && reg->signal_number == signal_number) |
| 545 | { | ||
| 546 |
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|
10 | if (!flags_compatible(reg->flags, flags)) |
| 547 | 2 | return make_error_code(std::errc::invalid_argument); | |
| 548 | 8 | return {}; | |
| 549 | } | ||
| 550 | |||
| 551 | // Check flag compatibility with global registration | ||
| 552 | // (different signal_set already registered this signal with different flags) | ||
| 553 |
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84 | if (state->registration_count[signal_number] > 0) |
| 554 | { | ||
| 555 |
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8 | if (!flags_compatible(state->registered_flags[signal_number], flags)) |
| 556 | 2 | return make_error_code(std::errc::invalid_argument); | |
| 557 | } | ||
| 558 | |||
| 559 |
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|
82 | auto* new_reg = new signal_registration; |
| 560 | 82 | new_reg->signal_number = signal_number; | |
| 561 | 82 | new_reg->flags = flags; | |
| 562 | 82 | new_reg->owner = &impl; | |
| 563 | 82 | new_reg->undelivered = 0; | |
| 564 | |||
| 565 | // Install signal handler on first global registration | ||
| 566 |
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82 | if (state->registration_count[signal_number] == 0) |
| 567 | { | ||
| 568 | 76 | struct sigaction sa = {}; | |
| 569 | 76 | sa.sa_handler = corosio_posix_signal_handler; | |
| 570 | 76 | sigemptyset(&sa.sa_mask); | |
| 571 | 76 | sa.sa_flags = to_sigaction_flags(flags); | |
| 572 | |||
| 573 |
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|
76 | if (::sigaction(signal_number, &sa, nullptr) < 0) |
| 574 | { | ||
| 575 | ✗ | delete new_reg; | |
| 576 | ✗ | return make_error_code(std::errc::invalid_argument); | |
| 577 | } | ||
| 578 | |||
| 579 | // Store the flags used for first registration | ||
| 580 | 76 | state->registered_flags[signal_number] = flags; | |
| 581 | } | ||
| 582 | |||
| 583 | 82 | new_reg->next_in_set = reg; | |
| 584 | 82 | *insertion_point = new_reg; | |
| 585 | |||
| 586 | 82 | new_reg->next_in_table = registrations_[signal_number]; | |
| 587 | 82 | new_reg->prev_in_table = nullptr; | |
| 588 |
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82 | if (registrations_[signal_number]) |
| 589 | 6 | registrations_[signal_number]->prev_in_table = new_reg; | |
| 590 | 82 | registrations_[signal_number] = new_reg; | |
| 591 | |||
| 592 | 82 | ++state->registration_count[signal_number]; | |
| 593 | 82 | ++registration_count_[signal_number]; | |
| 594 | |||
| 595 | 82 | return {}; | |
| 596 | 94 | } | |
| 597 | |||
| 598 | std::error_code | ||
| 599 | 4 | posix_signals_impl:: | |
| 600 | remove_signal( | ||
| 601 | posix_signal_impl& impl, | ||
| 602 | int signal_number) | ||
| 603 | { | ||
| 604 |
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4 | if (signal_number < 0 || signal_number >= max_signal_number) |
| 605 | ✗ | return make_error_code(std::errc::invalid_argument); | |
| 606 | |||
| 607 | 4 | signal_state* state = get_signal_state(); | |
| 608 |
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4 | std::lock_guard state_lock(state->mutex); |
| 609 |
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4 | std::lock_guard lock(mutex_); |
| 610 | |||
| 611 | 4 | signal_registration** deletion_point = &impl.signals_; | |
| 612 | 4 | signal_registration* reg = impl.signals_; | |
| 613 |
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4 | while (reg && reg->signal_number < signal_number) |
| 614 | { | ||
| 615 | ✗ | deletion_point = ®->next_in_set; | |
| 616 | ✗ | reg = reg->next_in_set; | |
| 617 | } | ||
| 618 | |||
| 619 |
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4 | if (!reg || reg->signal_number != signal_number) |
| 620 | 2 | return {}; | |
| 621 | |||
| 622 | // Restore default handler on last global unregistration | ||
| 623 |
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2 | if (state->registration_count[signal_number] == 1) |
| 624 | { | ||
| 625 | 2 | struct sigaction sa = {}; | |
| 626 | 2 | sa.sa_handler = SIG_DFL; | |
| 627 | 2 | sigemptyset(&sa.sa_mask); | |
| 628 | 2 | sa.sa_flags = 0; | |
| 629 | |||
| 630 |
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2 | if (::sigaction(signal_number, &sa, nullptr) < 0) |
| 631 | ✗ | return make_error_code(std::errc::invalid_argument); | |
| 632 | |||
| 633 | // Clear stored flags | ||
| 634 | 2 | state->registered_flags[signal_number] = signal_set::none; | |
| 635 | } | ||
| 636 | |||
| 637 | 2 | *deletion_point = reg->next_in_set; | |
| 638 | |||
| 639 |
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2 | if (registrations_[signal_number] == reg) |
| 640 | 2 | registrations_[signal_number] = reg->next_in_table; | |
| 641 |
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2 | if (reg->prev_in_table) |
| 642 | ✗ | reg->prev_in_table->next_in_table = reg->next_in_table; | |
| 643 |
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2 | if (reg->next_in_table) |
| 644 | ✗ | reg->next_in_table->prev_in_table = reg->prev_in_table; | |
| 645 | |||
| 646 | 2 | --state->registration_count[signal_number]; | |
| 647 | 2 | --registration_count_[signal_number]; | |
| 648 | |||
| 649 |
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2 | delete reg; |
| 650 | 2 | return {}; | |
| 651 | 4 | } | |
| 652 | |||
| 653 | std::error_code | ||
| 654 | 92 | posix_signals_impl:: | |
| 655 | clear_signals(posix_signal_impl& impl) | ||
| 656 | { | ||
| 657 | 92 | signal_state* state = get_signal_state(); | |
| 658 |
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92 | std::lock_guard state_lock(state->mutex); |
| 659 |
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92 | std::lock_guard lock(mutex_); |
| 660 | |||
| 661 | 92 | std::error_code first_error; | |
| 662 | |||
| 663 |
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172 | while (signal_registration* reg = impl.signals_) |
| 664 | { | ||
| 665 | 80 | int signal_number = reg->signal_number; | |
| 666 | |||
| 667 |
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80 | if (state->registration_count[signal_number] == 1) |
| 668 | { | ||
| 669 | 74 | struct sigaction sa = {}; | |
| 670 | 74 | sa.sa_handler = SIG_DFL; | |
| 671 | 74 | sigemptyset(&sa.sa_mask); | |
| 672 | 74 | sa.sa_flags = 0; | |
| 673 | |||
| 674 |
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74 | if (::sigaction(signal_number, &sa, nullptr) < 0 && !first_error) |
| 675 | ✗ | first_error = make_error_code(std::errc::invalid_argument); | |
| 676 | |||
| 677 | // Clear stored flags | ||
| 678 | 74 | state->registered_flags[signal_number] = signal_set::none; | |
| 679 | } | ||
| 680 | |||
| 681 | 80 | impl.signals_ = reg->next_in_set; | |
| 682 | |||
| 683 |
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80 | if (registrations_[signal_number] == reg) |
| 684 | 80 | registrations_[signal_number] = reg->next_in_table; | |
| 685 |
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80 | if (reg->prev_in_table) |
| 686 | ✗ | reg->prev_in_table->next_in_table = reg->next_in_table; | |
| 687 |
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80 | if (reg->next_in_table) |
| 688 | 6 | reg->next_in_table->prev_in_table = reg->prev_in_table; | |
| 689 | |||
| 690 | 80 | --state->registration_count[signal_number]; | |
| 691 | 80 | --registration_count_[signal_number]; | |
| 692 | |||
| 693 |
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80 | delete reg; |
| 694 | 80 | } | |
| 695 | |||
| 696 |
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92 | if (first_error) |
| 697 | ✗ | return first_error; | |
| 698 | 92 | return {}; | |
| 699 | 92 | } | |
| 700 | |||
| 701 | void | ||
| 702 | 100 | posix_signals_impl:: | |
| 703 | cancel_wait(posix_signal_impl& impl) | ||
| 704 | { | ||
| 705 | 100 | bool was_waiting = false; | |
| 706 | 100 | signal_op* op = nullptr; | |
| 707 | |||
| 708 | { | ||
| 709 |
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100 | std::lock_guard lock(mutex_); |
| 710 |
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100 | if (impl.waiting_) |
| 711 | { | ||
| 712 | 4 | was_waiting = true; | |
| 713 | 4 | impl.waiting_ = false; | |
| 714 | 4 | op = &impl.pending_op_; | |
| 715 | } | ||
| 716 | 100 | } | |
| 717 | |||
| 718 |
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100 | if (was_waiting) |
| 719 | { | ||
| 720 |
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4 | if (op->ec_out) |
| 721 | 4 | *op->ec_out = make_error_code(capy::error::canceled); | |
| 722 |
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4 | if (op->signal_out) |
| 723 | 4 | *op->signal_out = 0; | |
| 724 | 4 | op->d.post(op->h); | |
| 725 | 4 | sched_->on_work_finished(); | |
| 726 | } | ||
| 727 | 100 | } | |
| 728 | |||
| 729 | void | ||
| 730 | 26 | posix_signals_impl:: | |
| 731 | start_wait(posix_signal_impl& impl, signal_op* op) | ||
| 732 | { | ||
| 733 | { | ||
| 734 |
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26 | std::lock_guard lock(mutex_); |
| 735 | |||
| 736 | // Check for queued signals first (signal arrived before wait started) | ||
| 737 | 26 | signal_registration* reg = impl.signals_; | |
| 738 |
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44 | while (reg) |
| 739 | { | ||
| 740 |
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28 | if (reg->undelivered > 0) |
| 741 | { | ||
| 742 | 10 | --reg->undelivered; | |
| 743 | 10 | op->signal_number = reg->signal_number; | |
| 744 | // svc=nullptr: no work_finished needed since we never called work_started | ||
| 745 | 10 | op->svc = nullptr; | |
| 746 |
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10 | sched_->post(op); |
| 747 | 10 | return; | |
| 748 | } | ||
| 749 | 18 | reg = reg->next_in_set; | |
| 750 | } | ||
| 751 | |||
| 752 | // No queued signals - wait for delivery | ||
| 753 | 16 | impl.waiting_ = true; | |
| 754 | // svc=this: signal_op::operator() will call work_finished() to balance this | ||
| 755 | 16 | op->svc = this; | |
| 756 | 16 | sched_->on_work_started(); | |
| 757 | 26 | } | |
| 758 | } | ||
| 759 | |||
| 760 | void | ||
| 761 | 20 | posix_signals_impl:: | |
| 762 | deliver_signal(int signal_number) | ||
| 763 | { | ||
| 764 |
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20 | if (signal_number < 0 || signal_number >= max_signal_number) |
| 765 | ✗ | return; | |
| 766 | |||
| 767 | 20 | signal_state* state = get_signal_state(); | |
| 768 |
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20 | std::lock_guard lock(state->mutex); |
| 769 | |||
| 770 | 20 | posix_signals_impl* service = state->service_list; | |
| 771 |
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40 | while (service) |
| 772 | { | ||
| 773 |
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20 | std::lock_guard svc_lock(service->mutex_); |
| 774 | |||
| 775 | 20 | signal_registration* reg = service->registrations_[signal_number]; | |
| 776 |
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42 | while (reg) |
| 777 | { | ||
| 778 | 22 | posix_signal_impl* impl = static_cast<posix_signal_impl*>(reg->owner); | |
| 779 | |||
| 780 |
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22 | if (impl->waiting_) |
| 781 | { | ||
| 782 | 12 | impl->waiting_ = false; | |
| 783 | 12 | impl->pending_op_.signal_number = signal_number; | |
| 784 |
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12 | service->post(&impl->pending_op_); |
| 785 | } | ||
| 786 | else | ||
| 787 | { | ||
| 788 | 10 | ++reg->undelivered; | |
| 789 | } | ||
| 790 | |||
| 791 | 22 | reg = reg->next_in_table; | |
| 792 | } | ||
| 793 | |||
| 794 | 20 | service = service->next_; | |
| 795 | 20 | } | |
| 796 | 20 | } | |
| 797 | |||
| 798 | void | ||
| 799 | ✗ | posix_signals_impl:: | |
| 800 | work_started() noexcept | ||
| 801 | { | ||
| 802 | ✗ | sched_->work_started(); | |
| 803 | ✗ | } | |
| 804 | |||
| 805 | void | ||
| 806 | 12 | posix_signals_impl:: | |
| 807 | work_finished() noexcept | ||
| 808 | { | ||
| 809 | 12 | sched_->work_finished(); | |
| 810 | 12 | } | |
| 811 | |||
| 812 | void | ||
| 813 | 12 | posix_signals_impl:: | |
| 814 | post(signal_op* op) | ||
| 815 | { | ||
| 816 | 12 | sched_->post(op); | |
| 817 | 12 | } | |
| 818 | |||
| 819 | void | ||
| 820 | 336 | posix_signals_impl:: | |
| 821 | add_service(posix_signals_impl* service) | ||
| 822 | { | ||
| 823 | 336 | signal_state* state = get_signal_state(); | |
| 824 |
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336 | std::lock_guard lock(state->mutex); |
| 825 | |||
| 826 | 336 | service->next_ = state->service_list; | |
| 827 | 336 | service->prev_ = nullptr; | |
| 828 |
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336 | if (state->service_list) |
| 829 | 5 | state->service_list->prev_ = service; | |
| 830 | 336 | state->service_list = service; | |
| 831 | 336 | } | |
| 832 | |||
| 833 | void | ||
| 834 | 336 | posix_signals_impl:: | |
| 835 | remove_service(posix_signals_impl* service) | ||
| 836 | { | ||
| 837 | 336 | signal_state* state = get_signal_state(); | |
| 838 |
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336 | std::lock_guard lock(state->mutex); |
| 839 | |||
| 840 |
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336 | if (service->next_ || service->prev_ || state->service_list == service) |
| 841 | { | ||
| 842 |
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336 | if (state->service_list == service) |
| 843 | 336 | state->service_list = service->next_; | |
| 844 |
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336 | if (service->prev_) |
| 845 | ✗ | service->prev_->next_ = service->next_; | |
| 846 |
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336 | if (service->next_) |
| 847 | 5 | service->next_->prev_ = service->prev_; | |
| 848 | 336 | service->next_ = nullptr; | |
| 849 | 336 | service->prev_ = nullptr; | |
| 850 | } | ||
| 851 | 336 | } | |
| 852 | |||
| 853 | //------------------------------------------------------------------------------ | ||
| 854 | // get_signal_service - factory function | ||
| 855 | //------------------------------------------------------------------------------ | ||
| 856 | |||
| 857 | posix_signals& | ||
| 858 | 336 | get_signal_service(capy::execution_context& ctx, scheduler& sched) | |
| 859 | { | ||
| 860 | 336 | return ctx.make_service<posix_signals_impl>(sched); | |
| 861 | } | ||
| 862 | |||
| 863 | } // namespace detail | ||
| 864 | |||
| 865 | //------------------------------------------------------------------------------ | ||
| 866 | // signal_set implementation | ||
| 867 | //------------------------------------------------------------------------------ | ||
| 868 | |||
| 869 | 90 | signal_set:: | |
| 870 | 90 | ~signal_set() | |
| 871 | { | ||
| 872 |
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90 | if (impl_) |
| 873 | 86 | impl_->release(); | |
| 874 | 90 | } | |
| 875 | |||
| 876 | 88 | signal_set:: | |
| 877 | 88 | signal_set(capy::execution_context& ctx) | |
| 878 | 88 | : io_object(ctx) | |
| 879 | { | ||
| 880 | 88 | auto* svc = ctx.find_service<detail::posix_signals>(); | |
| 881 |
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88 | if (!svc) |
| 882 | ✗ | detail::throw_logic_error("signal_set: signal service not initialized"); | |
| 883 |
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|
88 | impl_ = &svc->create_impl(); |
| 884 | 88 | } | |
| 885 | |||
| 886 | 2 | signal_set:: | |
| 887 | 2 | signal_set(signal_set&& other) noexcept | |
| 888 | 2 | : io_object(std::move(other)) | |
| 889 | { | ||
| 890 | 2 | impl_ = other.impl_; | |
| 891 | 2 | other.impl_ = nullptr; | |
| 892 | 2 | } | |
| 893 | |||
| 894 | signal_set& | ||
| 895 | 4 | signal_set:: | |
| 896 | operator=(signal_set&& other) | ||
| 897 | { | ||
| 898 |
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4 | if (this != &other) |
| 899 | { | ||
| 900 |
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4 | if (ctx_ != other.ctx_) |
| 901 | 2 | detail::throw_logic_error("signal_set::operator=: context mismatch"); | |
| 902 | |||
| 903 |
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2 | if (impl_) |
| 904 | 2 | impl_->release(); | |
| 905 | |||
| 906 | 2 | impl_ = other.impl_; | |
| 907 | 2 | other.impl_ = nullptr; | |
| 908 | } | ||
| 909 | 2 | return *this; | |
| 910 | } | ||
| 911 | |||
| 912 | std::error_code | ||
| 913 | 96 | signal_set:: | |
| 914 | add(int signal_number, flags_t flags) | ||
| 915 | { | ||
| 916 | 96 | return get().add(signal_number, flags); | |
| 917 | } | ||
| 918 | |||
| 919 | std::error_code | ||
| 920 | 4 | signal_set:: | |
| 921 | remove(int signal_number) | ||
| 922 | { | ||
| 923 | 4 | return get().remove(signal_number); | |
| 924 | } | ||
| 925 | |||
| 926 | std::error_code | ||
| 927 | 4 | signal_set:: | |
| 928 | clear() | ||
| 929 | { | ||
| 930 | 4 | return get().clear(); | |
| 931 | } | ||
| 932 | |||
| 933 | void | ||
| 934 | 12 | signal_set:: | |
| 935 | cancel() | ||
| 936 | { | ||
| 937 | 12 | get().cancel(); | |
| 938 | 12 | } | |
| 939 | |||
| 940 | } // namespace boost::corosio | ||
| 941 | |||
| 942 | #endif // BOOST_COROSIO_POSIX | ||
| 943 |