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7c673cae | 1 | // |
b32b8144 | 2 | // detail/impl/win_iocp_io_context.ipp |
7c673cae FG |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
4 | // | |
f67539c2 | 5 | // Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
7c673cae FG |
6 | // |
7 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
8 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
9 | // | |
10 | ||
b32b8144 FG |
11 | #ifndef BOOST_ASIO_DETAIL_IMPL_WIN_IOCP_IO_CONTEXT_IPP |
12 | #define BOOST_ASIO_DETAIL_IMPL_WIN_IOCP_IO_CONTEXT_IPP | |
7c673cae FG |
13 | |
14 | #if defined(_MSC_VER) && (_MSC_VER >= 1200) | |
15 | # pragma once | |
16 | #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) | |
17 | ||
18 | #include <boost/asio/detail/config.hpp> | |
19 | ||
20 | #if defined(BOOST_ASIO_HAS_IOCP) | |
21 | ||
22 | #include <boost/asio/error.hpp> | |
7c673cae FG |
23 | #include <boost/asio/detail/cstdint.hpp> |
24 | #include <boost/asio/detail/handler_alloc_helpers.hpp> | |
25 | #include <boost/asio/detail/handler_invoke_helpers.hpp> | |
26 | #include <boost/asio/detail/limits.hpp> | |
92f5a8d4 | 27 | #include <boost/asio/detail/thread.hpp> |
7c673cae | 28 | #include <boost/asio/detail/throw_error.hpp> |
b32b8144 | 29 | #include <boost/asio/detail/win_iocp_io_context.hpp> |
7c673cae FG |
30 | |
31 | #include <boost/asio/detail/push_options.hpp> | |
32 | ||
33 | namespace boost { | |
34 | namespace asio { | |
35 | namespace detail { | |
36 | ||
92f5a8d4 TL |
37 | struct win_iocp_io_context::thread_function |
38 | { | |
39 | explicit thread_function(win_iocp_io_context* s) | |
40 | : this_(s) | |
41 | { | |
42 | } | |
43 | ||
44 | void operator()() | |
45 | { | |
46 | boost::system::error_code ec; | |
47 | this_->run(ec); | |
48 | } | |
49 | ||
50 | win_iocp_io_context* this_; | |
51 | }; | |
52 | ||
b32b8144 | 53 | struct win_iocp_io_context::work_finished_on_block_exit |
7c673cae FG |
54 | { |
55 | ~work_finished_on_block_exit() | |
56 | { | |
b32b8144 | 57 | io_context_->work_finished(); |
7c673cae FG |
58 | } |
59 | ||
b32b8144 | 60 | win_iocp_io_context* io_context_; |
7c673cae FG |
61 | }; |
62 | ||
b32b8144 | 63 | struct win_iocp_io_context::timer_thread_function |
7c673cae FG |
64 | { |
65 | void operator()() | |
66 | { | |
b32b8144 | 67 | while (::InterlockedExchangeAdd(&io_context_->shutdown_, 0) == 0) |
7c673cae | 68 | { |
b32b8144 | 69 | if (::WaitForSingleObject(io_context_->waitable_timer_.handle, |
7c673cae FG |
70 | INFINITE) == WAIT_OBJECT_0) |
71 | { | |
b32b8144 FG |
72 | ::InterlockedExchange(&io_context_->dispatch_required_, 1); |
73 | ::PostQueuedCompletionStatus(io_context_->iocp_.handle, | |
7c673cae FG |
74 | 0, wake_for_dispatch, 0); |
75 | } | |
76 | } | |
77 | } | |
78 | ||
b32b8144 | 79 | win_iocp_io_context* io_context_; |
7c673cae FG |
80 | }; |
81 | ||
b32b8144 | 82 | win_iocp_io_context::win_iocp_io_context( |
92f5a8d4 | 83 | boost::asio::execution_context& ctx, int concurrency_hint, bool own_thread) |
b32b8144 | 84 | : execution_context_service_base<win_iocp_io_context>(ctx), |
7c673cae FG |
85 | iocp_(), |
86 | outstanding_work_(0), | |
87 | stopped_(0), | |
88 | stop_event_posted_(0), | |
89 | shutdown_(0), | |
90 | gqcs_timeout_(get_gqcs_timeout()), | |
b32b8144 FG |
91 | dispatch_required_(0), |
92 | concurrency_hint_(concurrency_hint) | |
7c673cae FG |
93 | { |
94 | BOOST_ASIO_HANDLER_TRACKING_INIT; | |
95 | ||
96 | iocp_.handle = ::CreateIoCompletionPort(INVALID_HANDLE_VALUE, 0, 0, | |
b32b8144 | 97 | static_cast<DWORD>(concurrency_hint >= 0 ? concurrency_hint : DWORD(~0))); |
7c673cae FG |
98 | if (!iocp_.handle) |
99 | { | |
100 | DWORD last_error = ::GetLastError(); | |
101 | boost::system::error_code ec(last_error, | |
102 | boost::asio::error::get_system_category()); | |
103 | boost::asio::detail::throw_error(ec, "iocp"); | |
104 | } | |
92f5a8d4 TL |
105 | |
106 | if (own_thread) | |
107 | { | |
108 | ::InterlockedIncrement(&outstanding_work_); | |
109 | thread_.reset(new boost::asio::detail::thread(thread_function(this))); | |
110 | } | |
111 | } | |
112 | ||
113 | win_iocp_io_context::~win_iocp_io_context() | |
114 | { | |
115 | if (thread_.get()) | |
116 | { | |
117 | thread_->join(); | |
118 | thread_.reset(); | |
119 | } | |
7c673cae FG |
120 | } |
121 | ||
b32b8144 | 122 | void win_iocp_io_context::shutdown() |
7c673cae FG |
123 | { |
124 | ::InterlockedExchange(&shutdown_, 1); | |
125 | ||
126 | if (timer_thread_.get()) | |
127 | { | |
128 | LARGE_INTEGER timeout; | |
129 | timeout.QuadPart = 1; | |
130 | ::SetWaitableTimer(waitable_timer_.handle, &timeout, 1, 0, 0, FALSE); | |
131 | } | |
132 | ||
92f5a8d4 TL |
133 | if (thread_.get()) |
134 | { | |
f67539c2 | 135 | stop(); |
92f5a8d4 TL |
136 | thread_->join(); |
137 | thread_.reset(); | |
138 | ::InterlockedDecrement(&outstanding_work_); | |
139 | } | |
140 | ||
7c673cae FG |
141 | while (::InterlockedExchangeAdd(&outstanding_work_, 0) > 0) |
142 | { | |
143 | op_queue<win_iocp_operation> ops; | |
144 | timer_queues_.get_all_timers(ops); | |
145 | ops.push(completed_ops_); | |
146 | if (!ops.empty()) | |
147 | { | |
148 | while (win_iocp_operation* op = ops.front()) | |
149 | { | |
150 | ops.pop(); | |
151 | ::InterlockedDecrement(&outstanding_work_); | |
152 | op->destroy(); | |
153 | } | |
154 | } | |
155 | else | |
156 | { | |
157 | DWORD bytes_transferred = 0; | |
158 | dword_ptr_t completion_key = 0; | |
159 | LPOVERLAPPED overlapped = 0; | |
160 | ::GetQueuedCompletionStatus(iocp_.handle, &bytes_transferred, | |
161 | &completion_key, &overlapped, gqcs_timeout_); | |
162 | if (overlapped) | |
163 | { | |
164 | ::InterlockedDecrement(&outstanding_work_); | |
165 | static_cast<win_iocp_operation*>(overlapped)->destroy(); | |
166 | } | |
167 | } | |
168 | } | |
169 | ||
170 | if (timer_thread_.get()) | |
171 | timer_thread_->join(); | |
172 | } | |
173 | ||
b32b8144 | 174 | boost::system::error_code win_iocp_io_context::register_handle( |
7c673cae FG |
175 | HANDLE handle, boost::system::error_code& ec) |
176 | { | |
177 | if (::CreateIoCompletionPort(handle, iocp_.handle, 0, 0) == 0) | |
178 | { | |
179 | DWORD last_error = ::GetLastError(); | |
180 | ec = boost::system::error_code(last_error, | |
181 | boost::asio::error::get_system_category()); | |
182 | } | |
183 | else | |
184 | { | |
185 | ec = boost::system::error_code(); | |
186 | } | |
187 | return ec; | |
188 | } | |
189 | ||
b32b8144 | 190 | size_t win_iocp_io_context::run(boost::system::error_code& ec) |
7c673cae FG |
191 | { |
192 | if (::InterlockedExchangeAdd(&outstanding_work_, 0) == 0) | |
193 | { | |
194 | stop(); | |
195 | ec = boost::system::error_code(); | |
196 | return 0; | |
197 | } | |
198 | ||
199 | win_iocp_thread_info this_thread; | |
200 | thread_call_stack::context ctx(this, this_thread); | |
201 | ||
202 | size_t n = 0; | |
b32b8144 | 203 | while (do_one(INFINITE, ec)) |
7c673cae FG |
204 | if (n != (std::numeric_limits<size_t>::max)()) |
205 | ++n; | |
206 | return n; | |
207 | } | |
208 | ||
b32b8144 | 209 | size_t win_iocp_io_context::run_one(boost::system::error_code& ec) |
7c673cae FG |
210 | { |
211 | if (::InterlockedExchangeAdd(&outstanding_work_, 0) == 0) | |
212 | { | |
213 | stop(); | |
214 | ec = boost::system::error_code(); | |
215 | return 0; | |
216 | } | |
217 | ||
218 | win_iocp_thread_info this_thread; | |
219 | thread_call_stack::context ctx(this, this_thread); | |
220 | ||
b32b8144 | 221 | return do_one(INFINITE, ec); |
7c673cae FG |
222 | } |
223 | ||
b32b8144 FG |
224 | size_t win_iocp_io_context::wait_one(long usec, boost::system::error_code& ec) |
225 | { | |
226 | if (::InterlockedExchangeAdd(&outstanding_work_, 0) == 0) | |
227 | { | |
228 | stop(); | |
229 | ec = boost::system::error_code(); | |
230 | return 0; | |
231 | } | |
232 | ||
233 | win_iocp_thread_info this_thread; | |
234 | thread_call_stack::context ctx(this, this_thread); | |
235 | ||
236 | return do_one(usec < 0 ? INFINITE : ((usec - 1) / 1000 + 1), ec); | |
237 | } | |
238 | ||
239 | size_t win_iocp_io_context::poll(boost::system::error_code& ec) | |
7c673cae FG |
240 | { |
241 | if (::InterlockedExchangeAdd(&outstanding_work_, 0) == 0) | |
242 | { | |
243 | stop(); | |
244 | ec = boost::system::error_code(); | |
245 | return 0; | |
246 | } | |
247 | ||
248 | win_iocp_thread_info this_thread; | |
249 | thread_call_stack::context ctx(this, this_thread); | |
250 | ||
251 | size_t n = 0; | |
b32b8144 | 252 | while (do_one(0, ec)) |
7c673cae FG |
253 | if (n != (std::numeric_limits<size_t>::max)()) |
254 | ++n; | |
255 | return n; | |
256 | } | |
257 | ||
b32b8144 | 258 | size_t win_iocp_io_context::poll_one(boost::system::error_code& ec) |
7c673cae FG |
259 | { |
260 | if (::InterlockedExchangeAdd(&outstanding_work_, 0) == 0) | |
261 | { | |
262 | stop(); | |
263 | ec = boost::system::error_code(); | |
264 | return 0; | |
265 | } | |
266 | ||
267 | win_iocp_thread_info this_thread; | |
268 | thread_call_stack::context ctx(this, this_thread); | |
269 | ||
b32b8144 | 270 | return do_one(0, ec); |
7c673cae FG |
271 | } |
272 | ||
b32b8144 | 273 | void win_iocp_io_context::stop() |
7c673cae FG |
274 | { |
275 | if (::InterlockedExchange(&stopped_, 1) == 0) | |
276 | { | |
277 | if (::InterlockedExchange(&stop_event_posted_, 1) == 0) | |
278 | { | |
279 | if (!::PostQueuedCompletionStatus(iocp_.handle, 0, 0, 0)) | |
280 | { | |
281 | DWORD last_error = ::GetLastError(); | |
282 | boost::system::error_code ec(last_error, | |
283 | boost::asio::error::get_system_category()); | |
284 | boost::asio::detail::throw_error(ec, "pqcs"); | |
285 | } | |
286 | } | |
287 | } | |
288 | } | |
289 | ||
b32b8144 | 290 | void win_iocp_io_context::post_deferred_completion(win_iocp_operation* op) |
7c673cae FG |
291 | { |
292 | // Flag the operation as ready. | |
293 | op->ready_ = 1; | |
294 | ||
295 | // Enqueue the operation on the I/O completion port. | |
296 | if (!::PostQueuedCompletionStatus(iocp_.handle, 0, 0, op)) | |
297 | { | |
298 | // Out of resources. Put on completed queue instead. | |
299 | mutex::scoped_lock lock(dispatch_mutex_); | |
300 | completed_ops_.push(op); | |
301 | ::InterlockedExchange(&dispatch_required_, 1); | |
302 | } | |
303 | } | |
304 | ||
b32b8144 | 305 | void win_iocp_io_context::post_deferred_completions( |
7c673cae FG |
306 | op_queue<win_iocp_operation>& ops) |
307 | { | |
308 | while (win_iocp_operation* op = ops.front()) | |
309 | { | |
310 | ops.pop(); | |
311 | ||
312 | // Flag the operation as ready. | |
313 | op->ready_ = 1; | |
314 | ||
315 | // Enqueue the operation on the I/O completion port. | |
316 | if (!::PostQueuedCompletionStatus(iocp_.handle, 0, 0, op)) | |
317 | { | |
318 | // Out of resources. Put on completed queue instead. | |
319 | mutex::scoped_lock lock(dispatch_mutex_); | |
320 | completed_ops_.push(op); | |
321 | completed_ops_.push(ops); | |
322 | ::InterlockedExchange(&dispatch_required_, 1); | |
323 | } | |
324 | } | |
325 | } | |
326 | ||
b32b8144 | 327 | void win_iocp_io_context::abandon_operations( |
7c673cae FG |
328 | op_queue<win_iocp_operation>& ops) |
329 | { | |
330 | while (win_iocp_operation* op = ops.front()) | |
331 | { | |
332 | ops.pop(); | |
333 | ::InterlockedDecrement(&outstanding_work_); | |
334 | op->destroy(); | |
335 | } | |
336 | } | |
337 | ||
b32b8144 | 338 | void win_iocp_io_context::on_pending(win_iocp_operation* op) |
7c673cae FG |
339 | { |
340 | if (::InterlockedCompareExchange(&op->ready_, 1, 0) == 1) | |
341 | { | |
342 | // Enqueue the operation on the I/O completion port. | |
343 | if (!::PostQueuedCompletionStatus(iocp_.handle, | |
344 | 0, overlapped_contains_result, op)) | |
345 | { | |
346 | // Out of resources. Put on completed queue instead. | |
347 | mutex::scoped_lock lock(dispatch_mutex_); | |
348 | completed_ops_.push(op); | |
349 | ::InterlockedExchange(&dispatch_required_, 1); | |
350 | } | |
351 | } | |
352 | } | |
353 | ||
b32b8144 | 354 | void win_iocp_io_context::on_completion(win_iocp_operation* op, |
7c673cae FG |
355 | DWORD last_error, DWORD bytes_transferred) |
356 | { | |
357 | // Flag that the operation is ready for invocation. | |
358 | op->ready_ = 1; | |
359 | ||
360 | // Store results in the OVERLAPPED structure. | |
361 | op->Internal = reinterpret_cast<ulong_ptr_t>( | |
362 | &boost::asio::error::get_system_category()); | |
363 | op->Offset = last_error; | |
364 | op->OffsetHigh = bytes_transferred; | |
365 | ||
366 | // Enqueue the operation on the I/O completion port. | |
367 | if (!::PostQueuedCompletionStatus(iocp_.handle, | |
368 | 0, overlapped_contains_result, op)) | |
369 | { | |
370 | // Out of resources. Put on completed queue instead. | |
371 | mutex::scoped_lock lock(dispatch_mutex_); | |
372 | completed_ops_.push(op); | |
373 | ::InterlockedExchange(&dispatch_required_, 1); | |
374 | } | |
375 | } | |
376 | ||
b32b8144 | 377 | void win_iocp_io_context::on_completion(win_iocp_operation* op, |
7c673cae FG |
378 | const boost::system::error_code& ec, DWORD bytes_transferred) |
379 | { | |
380 | // Flag that the operation is ready for invocation. | |
381 | op->ready_ = 1; | |
382 | ||
383 | // Store results in the OVERLAPPED structure. | |
384 | op->Internal = reinterpret_cast<ulong_ptr_t>(&ec.category()); | |
385 | op->Offset = ec.value(); | |
386 | op->OffsetHigh = bytes_transferred; | |
387 | ||
388 | // Enqueue the operation on the I/O completion port. | |
389 | if (!::PostQueuedCompletionStatus(iocp_.handle, | |
390 | 0, overlapped_contains_result, op)) | |
391 | { | |
392 | // Out of resources. Put on completed queue instead. | |
393 | mutex::scoped_lock lock(dispatch_mutex_); | |
394 | completed_ops_.push(op); | |
395 | ::InterlockedExchange(&dispatch_required_, 1); | |
396 | } | |
397 | } | |
398 | ||
b32b8144 | 399 | size_t win_iocp_io_context::do_one(DWORD msec, boost::system::error_code& ec) |
7c673cae FG |
400 | { |
401 | for (;;) | |
402 | { | |
403 | // Try to acquire responsibility for dispatching timers and completed ops. | |
404 | if (::InterlockedCompareExchange(&dispatch_required_, 0, 1) == 1) | |
405 | { | |
406 | mutex::scoped_lock lock(dispatch_mutex_); | |
407 | ||
408 | // Dispatch pending timers and operations. | |
409 | op_queue<win_iocp_operation> ops; | |
410 | ops.push(completed_ops_); | |
411 | timer_queues_.get_ready_timers(ops); | |
412 | post_deferred_completions(ops); | |
413 | update_timeout(); | |
414 | } | |
415 | ||
416 | // Get the next operation from the queue. | |
417 | DWORD bytes_transferred = 0; | |
418 | dword_ptr_t completion_key = 0; | |
419 | LPOVERLAPPED overlapped = 0; | |
420 | ::SetLastError(0); | |
b32b8144 FG |
421 | BOOL ok = ::GetQueuedCompletionStatus(iocp_.handle, |
422 | &bytes_transferred, &completion_key, &overlapped, | |
423 | msec < gqcs_timeout_ ? msec : gqcs_timeout_); | |
7c673cae FG |
424 | DWORD last_error = ::GetLastError(); |
425 | ||
426 | if (overlapped) | |
427 | { | |
428 | win_iocp_operation* op = static_cast<win_iocp_operation*>(overlapped); | |
429 | boost::system::error_code result_ec(last_error, | |
430 | boost::asio::error::get_system_category()); | |
431 | ||
432 | // We may have been passed the last_error and bytes_transferred in the | |
433 | // OVERLAPPED structure itself. | |
434 | if (completion_key == overlapped_contains_result) | |
435 | { | |
436 | result_ec = boost::system::error_code(static_cast<int>(op->Offset), | |
437 | *reinterpret_cast<boost::system::error_category*>(op->Internal)); | |
438 | bytes_transferred = op->OffsetHigh; | |
439 | } | |
440 | ||
441 | // Otherwise ensure any result has been saved into the OVERLAPPED | |
442 | // structure. | |
443 | else | |
444 | { | |
445 | op->Internal = reinterpret_cast<ulong_ptr_t>(&result_ec.category()); | |
446 | op->Offset = result_ec.value(); | |
447 | op->OffsetHigh = bytes_transferred; | |
448 | } | |
449 | ||
450 | // Dispatch the operation only if ready. The operation may not be ready | |
451 | // if the initiating function (e.g. a call to WSARecv) has not yet | |
452 | // returned. This is because the initiating function still wants access | |
453 | // to the operation's OVERLAPPED structure. | |
454 | if (::InterlockedCompareExchange(&op->ready_, 1, 0) == 1) | |
455 | { | |
456 | // Ensure the count of outstanding work is decremented on block exit. | |
457 | work_finished_on_block_exit on_exit = { this }; | |
458 | (void)on_exit; | |
459 | ||
b32b8144 | 460 | op->complete(this, result_ec, bytes_transferred); |
7c673cae FG |
461 | ec = boost::system::error_code(); |
462 | return 1; | |
463 | } | |
464 | } | |
465 | else if (!ok) | |
466 | { | |
467 | if (last_error != WAIT_TIMEOUT) | |
468 | { | |
469 | ec = boost::system::error_code(last_error, | |
470 | boost::asio::error::get_system_category()); | |
471 | return 0; | |
472 | } | |
473 | ||
b32b8144 FG |
474 | // If we're waiting indefinitely we need to keep going until we get a |
475 | // real handler. | |
476 | if (msec == INFINITE) | |
7c673cae FG |
477 | continue; |
478 | ||
479 | ec = boost::system::error_code(); | |
480 | return 0; | |
481 | } | |
482 | else if (completion_key == wake_for_dispatch) | |
483 | { | |
484 | // We have been woken up to try to acquire responsibility for dispatching | |
485 | // timers and completed operations. | |
486 | } | |
487 | else | |
488 | { | |
489 | // Indicate that there is no longer an in-flight stop event. | |
490 | ::InterlockedExchange(&stop_event_posted_, 0); | |
491 | ||
492 | // The stopped_ flag is always checked to ensure that any leftover | |
493 | // stop events from a previous run invocation are ignored. | |
494 | if (::InterlockedExchangeAdd(&stopped_, 0) != 0) | |
495 | { | |
496 | // Wake up next thread that is blocked on GetQueuedCompletionStatus. | |
497 | if (::InterlockedExchange(&stop_event_posted_, 1) == 0) | |
498 | { | |
499 | if (!::PostQueuedCompletionStatus(iocp_.handle, 0, 0, 0)) | |
500 | { | |
501 | last_error = ::GetLastError(); | |
502 | ec = boost::system::error_code(last_error, | |
503 | boost::asio::error::get_system_category()); | |
504 | return 0; | |
505 | } | |
506 | } | |
507 | ||
508 | ec = boost::system::error_code(); | |
509 | return 0; | |
510 | } | |
511 | } | |
512 | } | |
513 | } | |
514 | ||
b32b8144 | 515 | DWORD win_iocp_io_context::get_gqcs_timeout() |
7c673cae FG |
516 | { |
517 | OSVERSIONINFOEX osvi; | |
518 | ZeroMemory(&osvi, sizeof(osvi)); | |
519 | osvi.dwOSVersionInfoSize = sizeof(osvi); | |
520 | osvi.dwMajorVersion = 6ul; | |
521 | ||
522 | const uint64_t condition_mask = ::VerSetConditionMask( | |
523 | 0, VER_MAJORVERSION, VER_GREATER_EQUAL); | |
524 | ||
525 | if (!!::VerifyVersionInfo(&osvi, VER_MAJORVERSION, condition_mask)) | |
526 | return INFINITE; | |
527 | ||
528 | return default_gqcs_timeout; | |
529 | } | |
530 | ||
b32b8144 | 531 | void win_iocp_io_context::do_add_timer_queue(timer_queue_base& queue) |
7c673cae FG |
532 | { |
533 | mutex::scoped_lock lock(dispatch_mutex_); | |
534 | ||
535 | timer_queues_.insert(&queue); | |
536 | ||
537 | if (!waitable_timer_.handle) | |
538 | { | |
539 | waitable_timer_.handle = ::CreateWaitableTimer(0, FALSE, 0); | |
540 | if (waitable_timer_.handle == 0) | |
541 | { | |
542 | DWORD last_error = ::GetLastError(); | |
543 | boost::system::error_code ec(last_error, | |
544 | boost::asio::error::get_system_category()); | |
545 | boost::asio::detail::throw_error(ec, "timer"); | |
546 | } | |
547 | ||
548 | LARGE_INTEGER timeout; | |
549 | timeout.QuadPart = -max_timeout_usec; | |
550 | timeout.QuadPart *= 10; | |
551 | ::SetWaitableTimer(waitable_timer_.handle, | |
552 | &timeout, max_timeout_msec, 0, 0, FALSE); | |
553 | } | |
554 | ||
555 | if (!timer_thread_.get()) | |
556 | { | |
557 | timer_thread_function thread_function = { this }; | |
558 | timer_thread_.reset(new thread(thread_function, 65536)); | |
559 | } | |
560 | } | |
561 | ||
b32b8144 | 562 | void win_iocp_io_context::do_remove_timer_queue(timer_queue_base& queue) |
7c673cae FG |
563 | { |
564 | mutex::scoped_lock lock(dispatch_mutex_); | |
565 | ||
566 | timer_queues_.erase(&queue); | |
567 | } | |
568 | ||
b32b8144 | 569 | void win_iocp_io_context::update_timeout() |
7c673cae FG |
570 | { |
571 | if (timer_thread_.get()) | |
572 | { | |
573 | // There's no point updating the waitable timer if the new timeout period | |
574 | // exceeds the maximum timeout. In that case, we might as well wait for the | |
575 | // existing period of the timer to expire. | |
576 | long timeout_usec = timer_queues_.wait_duration_usec(max_timeout_usec); | |
577 | if (timeout_usec < max_timeout_usec) | |
578 | { | |
579 | LARGE_INTEGER timeout; | |
580 | timeout.QuadPart = -timeout_usec; | |
581 | timeout.QuadPart *= 10; | |
582 | ::SetWaitableTimer(waitable_timer_.handle, | |
583 | &timeout, max_timeout_msec, 0, 0, FALSE); | |
584 | } | |
585 | } | |
586 | } | |
587 | ||
588 | } // namespace detail | |
589 | } // namespace asio | |
590 | } // namespace boost | |
591 | ||
592 | #include <boost/asio/detail/pop_options.hpp> | |
593 | ||
594 | #endif // defined(BOOST_ASIO_HAS_IOCP) | |
595 | ||
b32b8144 | 596 | #endif // BOOST_ASIO_DETAIL_IMPL_WIN_IOCP_IO_CONTEXT_IPP |