Index/include / boost / corosio / native / detail / iocp / win_wsa_init.hpp

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

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win_wsa_init.hpp
f(x) Functions (3)
Function Calls Lines Branches Blocks
boost::corosio::detail::win_wsa_init_count() :49 8968x 100.0% – 100.0% boost::corosio::detail::win_wsa_init::win_wsa_init() :55 4484x 71.4% 80.0% 60.0% boost::corosio::detail::win_wsa_init::~win_wsa_init() :69 4484x 100.0% 100.0% 100.0%
Line Branch TLA Hits Source Code
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_WSA_INIT_HPP
12 #define BOOST_COROSIO_NATIVE_DETAIL_IOCP_WIN_WSA_INIT_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 #include <boost/corosio/native/detail/make_err.hpp>
20 #include <boost/corosio/detail/except.hpp>
21
22 #include <boost/corosio/native/detail/iocp/win_windows.hpp>
23
24 namespace boost::corosio::detail {
25
26 /** RAII class for Winsock initialization.
27
28 Uses reference counting to ensure WSAStartup is called once on
29 first construction and WSACleanup on last destruction.
30
31 Derive from this class to ensure Winsock is initialized before
32 any socket operations.
33 */
34 class BOOST_COROSIO_DECL win_wsa_init
35 {
36 protected:
37 win_wsa_init();
38 ~win_wsa_init();
39
40 win_wsa_init(win_wsa_init const&) = delete;
41 win_wsa_init& operator=(win_wsa_init const&) = delete;
42 };
43
44 // Process-wide Winsock init refcount. Kept as an inline function-local
45 // static (one shared instance across TUs) rather than a static data member
46 // so win_wsa_init can carry BOOST_COROSIO_DECL: an exported/imported static
47 // data member defined in a header is rejected by MSVC and clang-cl
48 // ("definition of dllimport static field not allowed").
49 8968x inline long& win_wsa_init_count() noexcept
50 {
51 static long count = 0;
52 8968x return count;
53 }
54
55 4484x inline win_wsa_init::win_wsa_init()
56 {
57
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 8968x if (::InterlockedIncrement(&win_wsa_init_count()) == 1)
58 {
59 WSADATA wsaData;
60
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 1118x int result = ::WSAStartup(MAKEWORD(2, 2), &wsaData);
61
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 1118x if (result != 0)
62 {
63 ✗ ::InterlockedDecrement(&win_wsa_init_count());
64 ✗ throw_system_error(make_err(result));
65 }
66 }
67 4484x }
68
69 4484x inline win_wsa_init::~win_wsa_init()
70 {
71
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 8968x if (::InterlockedDecrement(&win_wsa_init_count()) == 0)
72 1118x ::WSACleanup();
73 4484x }
74
75 } // namespace boost::corosio::detail
76
77 #endif // BOOST_COROSIO_HAS_IOCP
78
79 #endif // BOOST_COROSIO_NATIVE_DETAIL_IOCP_WIN_WSA_INIT_HPP
80