include/boost/corosio/native/detail/posix/posix_random_access_file_service.hpp

90.7% Lines (127/140) 100.0% List of functions (15/15)

[ ] prev/next file n p prev/next uncovered line

posix_random_access_file_service.hpp

f(x) Functions (15)

Function Calls Lines Blocks

Line	Hits	Source Code
1		//
2		// Copyright (c) 2026 Michael Vandeberg
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		#ifndef BOOST_COROSIO_NATIVE_DETAIL_POSIX_POSIX_RANDOM_ACCESS_FILE_SERVICE_HPP
11		#define BOOST_COROSIO_NATIVE_DETAIL_POSIX_POSIX_RANDOM_ACCESS_FILE_SERVICE_HPP
12
13		#include <boost/corosio/detail/platform.hpp>
14
15		#if BOOST_COROSIO_POSIX
16
17		#include <boost/corosio/native/detail/posix/posix_random_access_file.hpp>
18		#include <boost/corosio/native/detail/reactor/reactor_scheduler.hpp>
19		#include <boost/corosio/detail/random_access_file_service.hpp>
20		#include <boost/corosio/detail/thread_pool.hpp>
21
22		#include <limits>
23		#include <mutex>
24		#include <unordered_map>
25
26		namespace boost::corosio::detail {
27
28		/** Random-access file service for POSIX backends. */
29		class BOOST_COROSIO_DECL posix_random_access_file_service final
30		: public random_access_file_service
31		{
32		public:
33	1334x	posix_random_access_file_service(
34		capy::execution_context& ctx, scheduler& sched)
35	2668x	: sched_(&sched)
36	1334x	, pool_(get_or_create_pool(ctx))
37		{
38	1334x	}
39
40	2668x	~posix_random_access_file_service() override = default;
41
42		posix_random_access_file_service(
43		posix_random_access_file_service const&) = delete;
44		posix_random_access_file_service& operator=(
45		posix_random_access_file_service const&) = delete;
46
47	76x	io_object::implementation* construct() override
48		{
49	76x	auto ptr = std::make_shared<posix_random_access_file>(*this);
50	76x	auto* impl = ptr.get();
51
52		{
53	76x	std::lock_guard<std::mutex> lock(mutex_);
54	76x	file_list_.push_back(impl);
55	76x	file_ptrs_[impl] = std::move(ptr);
56	76x	}
57
58	76x	return impl;
59	76x	}
60
61	76x	void destroy(io_object::implementation* p) override
62		{
63	76x	auto& impl = static_cast<posix_random_access_file&>(*p);
64	76x	impl.cancel();
65	76x	impl.close_file();
66	76x	destroy_impl(impl);
67	76x	}
68
69	136x	void close(io_object::handle& h) override
70		{
71	136x	if (h.get())
72		{
73	136x	auto& impl = static_cast<posix_random_access_file&>(*h.get());
74	136x	impl.cancel();
75	136x	impl.close_file();
76		}
77	136x	}
78
79	64x	std::error_code open_file(
80		random_access_file::implementation& impl,
81		std::filesystem::path const& path,
82		file_base::flags mode) override
83		{
84		// Unavailable in the unsafe tier: the file thread pool completes
85		// cross-thread, which the lockless scheduler cannot accept.
86	64x	if (sched_->scheduler_locking_disabled())
87	✗	return std::make_error_code(std::errc::operation_not_supported);
88	64x	return static_cast<posix_random_access_file&>(impl).open_file(
89	64x	path, mode);
90		}
91
92	1334x	void shutdown() override
93		{
94	1334x	std::lock_guard<std::mutex> lock(mutex_);
95	1334x	for (auto* impl = file_list_.pop_front(); impl != nullptr;
96	✗	impl = file_list_.pop_front())
97		{
98	✗	impl->cancel();
99	✗	impl->close_file();
100		}
101	1334x	file_ptrs_.clear();
102	1334x	}
103
104	76x	void destroy_impl(posix_random_access_file& impl)
105		{
106	76x	std::lock_guard<std::mutex> lock(mutex_);
107	76x	file_list_.remove(&impl);
108	76x	file_ptrs_.erase(&impl);
109	76x	}
110
111	294x	void post(scheduler_op* op)
112		{
113	294x	sched_->post(op);
114	294x	}
115
116		void work_started() noexcept
117		{
118		sched_->work_started();
119		}
120
121		void work_finished() noexcept
122		{
123		sched_->work_finished();
124		}
125
126	294x	thread_pool& pool() noexcept
127		{
128	294x	return pool_;
129		}
130
131		private:
132	1334x	static thread_pool& get_or_create_pool(capy::execution_context& ctx)
133		{
134	1334x	auto* p = ctx.find_service<thread_pool>();
135	1334x	if (p)
136	1334x	return *p;
137	✗	return ctx.make_service<thread_pool>();
138		}
139
140		scheduler* sched_;
141		thread_pool& pool_;
142		std::mutex mutex_;
143		intrusive_list<posix_random_access_file> file_list_;
144		std::unordered_map<
145		posix_random_access_file*,
146		std::shared_ptr<posix_random_access_file>>
147		file_ptrs_;
148		};
149
150		/** Get or create the random-access file service for the given context. */
151		inline posix_random_access_file_service&
152	1334x	get_random_access_file_service(capy::execution_context& ctx, scheduler& sched)
153		{
154	1334x	return ctx.make_service<posix_random_access_file_service>(sched);
155		}
156
157		// ---------------------------------------------------------------------------
158		// posix_random_access_file inline implementations (require complete service)
159		// ---------------------------------------------------------------------------
160
161		inline std::coroutine_handle<>
162	272x	posix_random_access_file::read_some_at(
163		std::uint64_t offset,
164		std::coroutine_handle<> h,
165		capy::executor_ref ex,
166		buffer_param param,
167		std::stop_token token,
168		std::error_code* ec,
169		std::size_t* bytes_out)
170		{
171	272x	capy::mutable_buffer bufs[max_buffers];
172	272x	auto count = param.copy_to(bufs, max_buffers);
173
174	272x	if (count == 0)
175		{
176	2x	*ec = {};
177	2x	*bytes_out = 0;
178	2x	return h;
179		}
180
181	270x	auto* op = new raf_op();
182	270x	op->is_read = true;
183	270x	op->offset = offset;
184
185	270x	op->iovec_count = static_cast<int>(count);
186	540x	for (int i = 0; i < op->iovec_count; ++i)
187		{
188	270x	op->iovecs[i].iov_base = bufs[i].data();
189	270x	op->iovecs[i].iov_len = bufs[i].size();
190		}
191
192	270x	op->h = h;
193	270x	op->ex = ex;
194	270x	op->ec_out = ec;
195	270x	op->bytes_out = bytes_out;
196	270x	op->file_ = this;
197	270x	op->file_ref = this->shared_from_this();
198	270x	op->start(token);
199
200	270x	op->ex.on_work_started();
201
202		{
203	270x	std::lock_guard<std::mutex> lock(ops_mutex_);
204	270x	outstanding_ops_.push_back(op);
205	270x	}
206
207	270x	static_cast<pool_work_item*>(op)->func_ = &raf_op::do_work;
208	270x	if (!svc_.pool().post(static_cast<pool_work_item*>(op)))
209		{
210	✗	op->cancelled.store(true, std::memory_order_release);
211	✗	svc_.post(static_cast<scheduler_op*>(op));
212		}
213	270x	return std::noop_coroutine();
214		}
215
216		inline std::coroutine_handle<>
217	26x	posix_random_access_file::write_some_at(
218		std::uint64_t offset,
219		std::coroutine_handle<> h,
220		capy::executor_ref ex,
221		buffer_param param,
222		std::stop_token token,
223		std::error_code* ec,
224		std::size_t* bytes_out)
225		{
226	26x	capy::mutable_buffer bufs[max_buffers];
227	26x	auto count = param.copy_to(bufs, max_buffers);
228
229	26x	if (count == 0)
230		{
231	2x	*ec = {};
232	2x	*bytes_out = 0;
233	2x	return h;
234		}
235
236	24x	auto* op = new raf_op();
237	24x	op->is_read = false;
238	24x	op->offset = offset;
239
240	24x	op->iovec_count = static_cast<int>(count);
241	48x	for (int i = 0; i < op->iovec_count; ++i)
242		{
243	24x	op->iovecs[i].iov_base = bufs[i].data();
244	24x	op->iovecs[i].iov_len = bufs[i].size();
245		}
246
247	24x	op->h = h;
248	24x	op->ex = ex;
249	24x	op->ec_out = ec;
250	24x	op->bytes_out = bytes_out;
251	24x	op->file_ = this;
252	24x	op->file_ref = this->shared_from_this();
253	24x	op->start(token);
254
255	24x	op->ex.on_work_started();
256
257		{
258	24x	std::lock_guard<std::mutex> lock(ops_mutex_);
259	24x	outstanding_ops_.push_back(op);
260	24x	}
261
262	24x	static_cast<pool_work_item*>(op)->func_ = &raf_op::do_work;
263	24x	if (!svc_.pool().post(static_cast<pool_work_item*>(op)))
264		{
265	✗	op->cancelled.store(true, std::memory_order_release);
266	✗	svc_.post(static_cast<scheduler_op*>(op));
267		}
268	24x	return std::noop_coroutine();
269		}
270
271		// -- raf_op thread-pool work function --
272
273		inline void
274	294x	posix_random_access_file::raf_op::do_work(pool_work_item* w) noexcept
275		{
276	294x	auto* op = static_cast<raf_op*>(w);
277	294x	auto* self = op->file_;
278
279	294x	if (op->cancelled.load(std::memory_order_acquire))
280		{
281	2x	op->errn = ECANCELED;
282	2x	op->bytes_transferred = 0;
283		}
284	584x	else if (op->offset >
285	292x	static_cast<std::uint64_t>(std::numeric_limits<off_t>::max()))
286		{
287	✗	op->errn = EOVERFLOW;
288	✗	op->bytes_transferred = 0;
289		}
290		else
291		{
292		ssize_t n;
293	292x	if (op->is_read)
294		{
295		do
296		{
297	536x	n = ::preadv(self->fd_, op->iovecs, op->iovec_count,
298	268x	static_cast<off_t>(op->offset));
299		}
300	268x	while (n < 0 && errno == EINTR);
301		}
302		else
303		{
304		do
305		{
306	48x	n = ::pwritev(self->fd_, op->iovecs, op->iovec_count,
307	24x	static_cast<off_t>(op->offset));
308		}
309	24x	while (n < 0 && errno == EINTR);
310		}
311
312	292x	if (n >= 0)
313		{
314	292x	op->errn = 0;
315	292x	op->bytes_transferred = static_cast<std::size_t>(n);
316		}
317		else
318		{
319	✗	op->errn = errno;
320	✗	op->bytes_transferred = 0;
321		}
322		}
323
324	294x	self->svc_.post(static_cast<scheduler_op*>(op));
325	294x	}
326
327		} // namespace boost::corosio::detail
328
329		#endif // BOOST_COROSIO_POSIX
330
331		#endif // BOOST_COROSIO_NATIVE_DETAIL_POSIX_POSIX_RANDOM_ACCESS_FILE_SERVICE_HPP
332