source: libcfa/src/concurrency/select.cfa

//
// Cforall Version 1.0.0 Copyright (C) 2021 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// channel.hfa -- LIBCFATHREAD
// Runtime locks that used with the runtime thread system.
//
// Author           : Colby Alexander Parsons
// Created On       : Thu Apr 21 19:46:50 2023
// Last Modified By :
// Last Modified On :
// Update Count     :
//

#define __cforall_thread__
#include "select.hfa"

#pragma GCC visibility push(default)

// As much code as possible is put in select.hfa to allow for inlining, 
//    but this .cfa is needed to link with alarm.cfa correctly ( and possibly some other things )

//=============================================================================================
// Waituntil Timeout support
//=============================================================================================

void ?{}( select_timeout_node & this, Duration duration, Alarm_Callback callback ) {
    this.a_node{ callback, duration, 0`s };
}
void ^?{}( select_timeout_node & this ) {}

void timeout_handler( select_timeout_node & this ) with( this ) {
    if ( !__make_select_node_available( *s_node ) ) return;
    unpark( s_node->blocked_thread );
}
void timeout_handler_select_cast( alarm_node_t & node ) { timeout_handler( ((select_timeout_node &) node) ); }

// Selectable trait routines
bool register_select( select_timeout_node & this, select_node & node ) {
    this.s_node = &node;
    node.extra = 0p;
    register_self( &this.a_node );
    return false;
}
bool unregister_select( select_timeout_node & this, select_node & node ) {
    unregister_self( &this.a_node );
    return false;
}
bool on_selected( select_timeout_node & this, select_node & node ) { return true; }

// Gateway routine to wait on duration
select_timeout_node timeout( Duration duration ) {
        select_timeout_node node{ duration, timeout_handler_select_cast };
    return node;
}
select_timeout_node sleep( Duration duration ) { return timeout( duration ); }