wait_parallel.c

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/*****************************************************************************
 * ugBASIC - an isomorphic BASIC language compiler for retrocomputers        *
 *****************************************************************************
 * Copyright 2021-2026 Marco Spedaletti (asimov@mclink.it)
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/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/

/* <usermanual>
@keyword WAIT PARALLEL
 
@english
 
The ''WAIT PARALLEL'' command allows you to wait for the completion 
of a previously running mandatory thread. In order for the thread 
to be considered completed, it must reach the last statement of 
the parallel procedure, or have executed the ''EXIT PROCEDURE'' command.
 
@italian
 
Il comando ''WAIT PARALLEL'' permette di attendere il completamento di 
un thread obbligatorio in esecuzione in precedenza. Affinché il thread 
possa considerarsi completato deve raggiungere l'ultima istruzione della 
procedura parallela, oppure aver eseguito il comando ''EXIT PROCEDURE''.
 
@syntax WAIT PARALLEL id
 
@example WAIT PARALLEL exampleThread
 
</usermanual> */
void wait_parallel( Environment * _environment, char * _thread ) {
 
    _environment->anyProtothread = 1;
 
    if ( _environment->protothreadForbid ) {
        CRITICAL_MULTITASKING_FORBIDDEN();
    }
 
    if ( ! _environment->procedureName ) {
        CRITICAL_WAIT_PARALLEL_CANNOT_BE_CALLED_OUTSIDE_PROCEDURE();
    }
 
    yield( _environment );
 
    MAKE_LABEL
 
    char protothreadLabel[MAX_TEMPORARY_STORAGE]; sprintf(protothreadLabel, "%spt%d", _environment->procedureName, _environment->protothreadStep );
 
    Variable * thread = variable_retrieve_or_define( _environment, _thread, VT_THREAD, 0 );
    Variable * state = variable_temporary( _environment, VT_THREAD, "(state)" );
    Variable * endedState = variable_temporary( _environment, VT_BYTE, "(ended state)" );
    variable_store( _environment, endedState->name, PROTOTHREAD_STATUS_ENDED );
 
    cpu_protothread_get_state( _environment, thread->realName, state->realName );
    cpu_bvneq( _environment, variable_compare( _environment, state->name, endedState->name )->realName, protothreadLabel );
 
    cpu_protothread_save( _environment, "PROTOTHREADCT", ( _environment->protothreadStep - 1 ) );
    cpu_protothread_set_state( _environment, "PROTOTHREADCT", PROTOTHREAD_STATUS_WAITING );
    cpu_return( _environment );
    cpu_label( _environment, protothreadLabel );
    cpu_protothread_set_state( _environment, "PROTOTHREADCT", PROTOTHREAD_STATUS_RUNNING );
 
    ++_environment->protothreadStep;
    
}