102 lines
3.2 KiB
C++
102 lines
3.2 KiB
C++
#pragma once
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#include <fc/thread/future.hpp>
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#include <fc/thread/priority.hpp>
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#include <fc/aligned.hpp>
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#include <fc/fwd.hpp>
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namespace fc {
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struct context;
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class spin_lock;
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class task_base : virtual public promise_base {
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public:
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void run();
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virtual void cancel() override;
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protected:
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~task_base();
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/// Task priority looks like unsupported feature.
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uint64_t _posted_num;
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priority _prio;
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time_point _when;
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void _set_active_context(context*);
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context* _active_context;
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task_base* _next;
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task_base(void* func);
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// opaque internal / private data used by
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// thread/thread_private
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friend class thread;
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friend class thread_d;
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fwd<spin_lock,8> _spinlock;
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// avoid rtti info for every possible functor...
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void* _promise_impl;
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void* _functor;
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void (*_destroy_functor)(void*);
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void (*_run_functor)(void*, void* );
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void run_impl();
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};
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namespace detail {
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template<typename T>
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struct functor_destructor {
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static void destroy( void* v ) { ((T*)v)->~T(); }
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};
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template<typename T>
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struct functor_run {
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static void run( void* functor, void* prom ) {
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((promise<decltype((*((T*)functor))())>*)prom)->set_value( (*((T*)functor))() );
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}
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};
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template<typename T>
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struct void_functor_run {
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static void run( void* functor, void* prom ) {
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(*((T*)functor))();
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((promise<void>*)prom)->set_value();
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}
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};
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}
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template<typename R,uint64_t FunctorSize=64>
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class task : virtual public task_base, virtual public promise<R> {
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public:
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template<typename Functor>
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task( Functor&& f, const char* desc ):promise_base(desc), task_base(&_functor), promise<R>(desc) {
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typedef typename fc::deduce<Functor>::type FunctorType;
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static_assert( sizeof(f) <= sizeof(_functor), "sizeof(Functor) is larger than FunctorSize" );
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new ((char*)&_functor) FunctorType( fc::forward<Functor>(f) );
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_destroy_functor = &detail::functor_destructor<FunctorType>::destroy;
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_promise_impl = static_cast<promise<R>*>(this);
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_run_functor = &detail::functor_run<FunctorType>::run;
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}
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virtual void cancel() override { task_base::cancel(); }
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aligned<FunctorSize> _functor;
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private:
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~task(){}
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};
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template<uint64_t FunctorSize>
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class task<void,FunctorSize> : virtual public task_base, virtual public promise<void> {
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public:
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template<typename Functor>
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task( Functor&& f, const char* desc ):promise_base(desc), task_base(&_functor), promise<void>(desc) {
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typedef typename fc::deduce<Functor>::type FunctorType;
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static_assert( sizeof(f) <= sizeof(_functor), "sizeof(Functor) is larger than FunctorSize" );
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new ((char*)&_functor) FunctorType( fc::forward<Functor>(f) );
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_destroy_functor = &detail::functor_destructor<FunctorType>::destroy;
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_promise_impl = static_cast<promise<void>*>(this);
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_run_functor = &detail::void_functor_run<FunctorType>::run;
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}
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virtual void cancel() override { task_base::cancel(); }
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aligned<FunctorSize> _functor;
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private:
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~task(){}
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};
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}
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