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7c673cae FG |
1 | |
2 | // Copyright Oliver Kowalke 2009. | |
3 | // Distributed under the Boost Software License, Version 1.0. | |
4 | // (See accompanying file LICENSE_1_0.txt or copy at | |
5 | // http://www.boost.org/LICENSE_1_0.txt) | |
6 | ||
7 | #include "boost/context/execution_context.hpp" | |
8 | ||
9 | #include <boost/config.hpp> | |
10 | ||
11 | #ifdef BOOST_HAS_ABI_HEADERS | |
12 | # include BOOST_ABI_PREFIX | |
13 | #endif | |
14 | ||
b32b8144 | 15 | #if (defined(BOOST_EXECUTION_CONTEXT) && (BOOST_EXECUTION_CONTEXT == 1)) |
7c673cae FG |
16 | namespace boost { |
17 | namespace context { | |
18 | namespace detail { | |
19 | ||
20 | thread_local | |
21 | activation_record::ptr_t | |
22 | activation_record::current_rec; | |
23 | ||
24 | // zero-initialization | |
25 | thread_local static std::size_t counter; | |
26 | ||
27 | // schwarz counter | |
28 | activation_record_initializer::activation_record_initializer() noexcept { | |
29 | if ( 0 == counter++) { | |
30 | activation_record::current_rec.reset( new activation_record() ); | |
31 | } | |
32 | } | |
33 | ||
34 | activation_record_initializer::~activation_record_initializer() { | |
35 | if ( 0 == --counter) { | |
36 | BOOST_ASSERT( activation_record::current_rec->is_main_context() ); | |
37 | delete activation_record::current_rec.detach(); | |
38 | } | |
39 | } | |
40 | ||
41 | } | |
42 | ||
43 | execution_context | |
44 | execution_context::current() noexcept { | |
45 | // initialized the first time control passes; per thread | |
46 | thread_local static detail::activation_record_initializer initializer; | |
47 | return execution_context(); | |
48 | } | |
49 | ||
50 | }} | |
7c673cae FG |
51 | #endif |
52 | ||
b32b8144 FG |
53 | #ifdef BOOST_HAS_ABI_HEADERS |
54 | # include BOOST_ABI_SUFFIX | |
55 | #endif |