include/boost/corosio/native/detail/iocp/win_mutex.hpp

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1		//
2		// Copyright (c) 2025 Vinnie Falco ([email protected])
3		// Copyright (c) 2026 Steve Gerbino
4		//
5		// Distributed under the Boost Software License, Version 1.0. (See accompanying
6		// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7		//
8		// Official repository: https://github.com/cppalliance/corosio
9		//
10
11		#ifndef BOOST_COROSIO_NATIVE_DETAIL_IOCP_WIN_MUTEX_HPP
12		#define BOOST_COROSIO_NATIVE_DETAIL_IOCP_WIN_MUTEX_HPP
13
14		#include <boost/corosio/detail/platform.hpp>
15
16		#if BOOST_COROSIO_HAS_IOCP
17
18		#include <boost/corosio/detail/config.hpp>
19
20		#include <boost/corosio/native/detail/iocp/win_windows.hpp>
21
22		namespace boost::corosio::detail {
23
24		/** Recursive mutex using Windows CRITICAL_SECTION.
25
26		This mutex can be locked multiple times by the same thread.
27		Each call to `lock()` or successful `try_lock()` must be
28		balanced by a corresponding call to `unlock()`.
29
30		Satisfies the Lockable named requirement and is compatible
31		with `std::lock_guard`, `std::unique_lock`, and `std::scoped_lock`.
32		*/
33		class win_mutex
34		{
35		public:
36	1160	win_mutex()
37	1160	{
38	1160	::InitializeCriticalSectionAndSpinCount(&cs_, 0x80000000);
39	1160	}
40
41	1160	~win_mutex()
42		{
43	1160	::DeleteCriticalSection(&cs_);
44	1160	}
45
46		win_mutex(win_mutex const&) = delete;
47		win_mutex& operator=(win_mutex const&) = delete;
48
49	22253	void lock() noexcept
50		{
51	22253	::EnterCriticalSection(&cs_);
52	22253	}
53
54	22253	void unlock() noexcept
55		{
56	22253	::LeaveCriticalSection(&cs_);
57	22253	}
58
59		bool try_lock() noexcept
60		{
61		return ::TryEnterCriticalSection(&cs_) != 0;
62		}
63
64		private:
65		::CRITICAL_SECTION cs_;
66		};
67
68		} // namespace boost::corosio::detail
69
70		#endif // BOOST_COROSIO_HAS_IOCP
71
72		#endif // BOOST_COROSIO_NATIVE_DETAIL_IOCP_WIN_MUTEX_HPP
73