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// Copyright Oliver Kowalke 2013.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// based on tss.hpp from boost.thread
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#ifndef BOOST_FIBERS_FSS_H
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#define BOOST_FIBERS_FSS_H
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#include <boost/config.hpp>
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#include <boost/fiber/context.hpp>
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#include <boost/fiber/detail/fss.hpp>
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_PREFIX
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#endif
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namespace boost {
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namespace fibers {
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template< typename T >
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class fiber_specific_ptr {
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private:
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struct default_cleanup_function : public detail::fss_cleanup_function {
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void operator()( void * data) noexcept override {
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delete static_cast< T * >( data);
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}
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};
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struct custom_cleanup_function : public detail::fss_cleanup_function {
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void (*fn)(T*);
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explicit custom_cleanup_function( void(*fn_)(T*) ) noexcept :
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fn{ fn_ } {
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}
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void operator()( void * data) override {
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if ( BOOST_LIKELY( nullptr != fn) ) {
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fn( static_cast< T * >( data) );
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}
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}
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};
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detail::fss_cleanup_function::ptr_t cleanup_fn_;
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public:
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using element_type = T;
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fiber_specific_ptr() :
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cleanup_fn_{ new default_cleanup_function() } {
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}
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explicit fiber_specific_ptr( void(*fn)(T*) ) :
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cleanup_fn_{ new custom_cleanup_function( fn) } {
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}
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~fiber_specific_ptr() {
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context * active_ctx = context::active();
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if ( nullptr != active_ctx) {
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active_ctx->set_fss_data(
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this, cleanup_fn_, nullptr, true);
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}
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}
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fiber_specific_ptr( fiber_specific_ptr const&) = delete;
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fiber_specific_ptr & operator=( fiber_specific_ptr const&) = delete;
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T * get() const noexcept {
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BOOST_ASSERT( context::active() );
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void * vp = context::active()->get_fss_data( this);
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return static_cast< T * >( vp);
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}
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T * operator->() const noexcept {
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return get();
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}
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T & operator*() const noexcept {
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return * get();
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}
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T * release() {
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T * tmp = get();
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context::active()->set_fss_data(
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this, cleanup_fn_, nullptr, false);
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return tmp;
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}
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void reset( T * t) {
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T * c = get();
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if ( BOOST_LIKELY( c != t) ) {
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context::active()->set_fss_data(
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this, cleanup_fn_, t, true);
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}
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}
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};
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}}
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_SUFFIX
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#endif
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#endif // BOOST_FIBERS_FSS_H
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