// Copyright Oliver Kowalke 2009. // 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 <boost/assert.hpp> #include <boost/context/all.hpp> #include "simple_stack_allocator.hpp" namespace ctx = boost::context; typedef ctx::simple_stack_allocator< 8 * 1024 * 1024, // 8MB 64 * 1024, // 64kB 8 * 1024 // 8kB > stack_allocator; ctx::fcontext_t fcm = 0; ctx::fcontext_t fc1 = 0; ctx::fcontext_t fc2 = 0; void f1( intptr_t) { std::cout << "f1: entered" << std::endl; std::cout << "f1: call jump_fcontext( & fc1, fc2, 0)" << std::endl; ctx::jump_fcontext( & fc1, fc2, 0); std::cout << "f1: return" << std::endl; } void f2( intptr_t) { std::cout << "f2: entered" << std::endl; std::cout << "f2: call jump_fcontext( & fc2, fc1, 0)" << std::endl; ctx::jump_fcontext( & fc2, fc1, 0); BOOST_ASSERT( false && ! "f2: never returns"); } int main( int argc, char * argv[]) { std::cout << "size: 0x" << std::hex << sizeof( ctx::fcontext_t) << std::endl; stack_allocator alloc; void * sp1 = alloc.allocate( stack_allocator::default_stacksize()); fc1 = ctx::make_fcontext( sp1, stack_allocator::default_stacksize(), f1); void * sp2 = alloc.allocate( stack_allocator::default_stacksize()); fc2 = ctx::make_fcontext( sp2, stack_allocator::default_stacksize(), f2); std::cout << "main: call start_fcontext( & fcm, fc1, 0)" << std::endl; ctx::jump_fcontext( & fcm, fc1, 0); std::cout << "main: done" << std::endl; BOOST_ASSERT( false && ! "main: never returns"); return EXIT_SUCCESS; }