92 lines
2.1 KiB
C++
92 lines
2.1 KiB
C++
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#include <fc/future.hpp>
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#include <fc/spin_yield_lock.hpp>
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#include <fc/exception.hpp>
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#include <fc/thread.hpp>
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#include <fc/error.hpp>
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#include <fc/unique_lock.hpp>
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#include <boost/assert.hpp>
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namespace fc {
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promise_base::promise_base( const char* desc )
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: _ready(false),
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_blocked_thread(nullptr),
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_timeout(time_point::max()),
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_canceled(false),
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_desc(desc),
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_compl(nullptr)
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{
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}
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const char* promise_base::get_desc()const{
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return _desc;
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}
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void promise_base::cancel(){
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_canceled = true;
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}
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bool promise_base::ready()const {
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return _ready;
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}
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bool promise_base::error()const {
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{ synchronized(_spin_yield)
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return _except;
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}
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}
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void promise_base::set_exception( const fc::exception_ptr& e ){
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_except = e;
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_set_value(nullptr);
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}
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void promise_base::_wait( const microseconds& timeout_us ){
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if( timeout_us == microseconds::max() ) _wait_until( time_point::max() );
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else _wait_until( time_point::now() + timeout_us );
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}
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void promise_base::_wait_until( const time_point& timeout_us ){
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{ synchronized(_spin_yield)
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if( _ready ) {
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if( _except ) fc::rethrow_exception( _except );
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return;
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}
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_enqueue_thread();
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}
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thread::current().wait_until( ptr(this,true), timeout_us );
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if( _ready ) {
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if( _except ) fc::rethrow_exception( _except );
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return;
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}
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FC_THROW( future_wait_timeout() );
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}
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void promise_base::_enqueue_thread(){
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_blocked_thread =&thread::current();
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}
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void promise_base::_notify(){
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if( _blocked_thread )
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_blocked_thread->notify(ptr(this,true));
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}
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void promise_base::_set_timeout(){
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if( _ready )
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return;
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set_exception( fc::copy_exception( future_wait_timeout() ) );
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}
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void promise_base::_set_value(const void* s){
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BOOST_ASSERT( !_ready );
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{ synchronized(_spin_yield)
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_ready = true;
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}
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_notify();
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if( _compl ) {
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_compl->on_complete(s,_except);
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}
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}
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void promise_base::_on_complete( detail::completion_handler* c ) {
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{ synchronized(_spin_yield)
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delete _compl;
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_compl = c;
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}
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}
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}
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