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BirdLeon
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ROBLOX2016
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Library/boost/libs/context/example/callcc/segmented.cpp
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19 дек 2024, 19:11
19 дек 2024, 19:11
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// Copyright Oliver Kowalke 2014. // Distributed under the Boost Software License, Version 1.0. // (See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) #include <cstdlib> #include <iostream> #include <memory> #include <boost/context/continuation.hpp> namespace ctx = boost::context; #ifdef BOOST_MSVC //MS VisualStudio __declspec(noinline) void access( char *buf); #else // GCC void access( char *buf) __attribute__ ((noinline)); #endif void access( char *buf) { buf[0] = '\0'; } void bar( int i) { char buf[4 * 1024]; if ( i > 0) { access( buf); std::cout << i << ". iteration" << std::endl; bar( i - 1); } } int main() { int count = 100*1024; #if defined(BOOST_USE_SEGMENTED_STACKS) std::cout << "using segmented_stack stacks: allocates " << count << " * 4kB == " << 4 * count << "kB on stack, "; std::cout << "initial stack size = " << ctx::segmented_stack::traits_type::default_size() / 1024 << "kB" << std::endl; std::cout << "application should not fail" << std::endl; #else std::cout << "using standard stacks: allocates " << count << " * 4kB == " << 4 * count << "kB on stack, "; std::cout << "initial stack size = " << ctx::fixedsize_stack::traits_type::default_size() / 1024 << "kB" << std::endl; std::cout << "application might fail" << std::endl; #endif ctx::continuation c = ctx::callcc( [count](ctx::continuation && c){ bar( count); return std::move( c); }); std::cout << "main: done" << std::endl; return EXIT_SUCCESS; }