1 2 // Copyright Oliver Kowalke 2014. 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 <cstdlib> 8 #include <iostream> 9 #include <memory> 10 11 #include <boost/context/continuation.hpp> 12 13 namespace ctx = boost::context; 14 15 #ifdef BOOST_MSVC //MS VisualStudio 16 __declspec(noinline) void access( char *buf); 17 #else // GCC 18 void access( char *buf) __attribute__ ((noinline)); 19 #endif access(char * buf)20void access( char *buf) { 21 buf[0] = '\0'; 22 } 23 bar(int i)24void bar( int i) { 25 char buf[4 * 1024]; 26 if ( i > 0) { 27 access( buf); 28 std::cout << i << ". iteration" << std::endl; 29 bar( i - 1); 30 } 31 } 32 main()33int main() { 34 int count = 100*1024; 35 #if defined(BOOST_USE_SEGMENTED_STACKS) 36 std::cout << "using segmented_stack stacks: allocates " << count << " * 4kB == " << 4 * count << "kB on stack, "; 37 std::cout << "initial stack size = " << ctx::segmented_stack::traits_type::default_size() / 1024 << "kB" << std::endl; 38 std::cout << "application should not fail" << std::endl; 39 #else 40 std::cout << "using standard stacks: allocates " << count << " * 4kB == " << 4 * count << "kB on stack, "; 41 std::cout << "initial stack size = " << ctx::fixedsize_stack::traits_type::default_size() / 1024 << "kB" << std::endl; 42 std::cout << "application might fail" << std::endl; 43 #endif 44 ctx::continuation c = ctx::callcc( 45 [count](ctx::continuation && c){ 46 bar( count); 47 return std::move( c); 48 }); 49 std::cout << "main: done" << std::endl; 50 return EXIT_SUCCESS; 51 } 52