respawn.c

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/*****************************************************************************
 * ugBASIC - an isomorphic BASIC language compiler for retrocomputers        *
 *****************************************************************************
 * Copyright 2021-2026 Marco Spedaletti (asimov@mclink.it)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *----------------------------------------------------------------------------
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 * (la "Licenza"); è proibito usare questo file se non in conformità alla
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/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/

/* <usermanual>
@keyword RESPAWN (instruction)
 
@english
 
This keyword will restart a (finished) (parallel) procedure. 
 
@italian
 
Questa parola chiave fa ricominciare una funzione terminata,
affinché sia eseguita in parallelo.
 
@syntax RESPAWN identifier
 
@example RESPAWN factorialHandle
 
</usermanual> */
 
/* <usermanual>
@keyword RESPAWN (function)
 
@english
 
This keyword will restart a (finished) (parallel) procedure,
giving back a thread id.
 
@italian
 
Questa parola chiave fa ricominciare una funzione terminata,
affinché sia eseguita in parallelo, restituendo il codice
identificativo del thread.
 
@syntax = RESPAWN identifier 
 
@example newHandle = RESPAWN factorialHandle 
 
</usermanual> */
 
Variable * respawn_procedure( Environment * _environment, char * _name ) {
 
    MAKE_LABEL
 
    Variable * threadId = variable_retrieve( _environment, _name );
    Variable * threadState = variable_temporary( _environment, VT_BYTE, "(current thread state)" );
 
    if ( threadId->type != VT_THREAD ) {
        CRITICAL_CANNOT_RESPAWN_NOT_THREADID( _name );
    }
 
    if ( _environment->protothreadForbid ) {
        CRITICAL_MULTITASKING_FORBIDDEN();
    }
 
    _environment->anyProtothread = 1;
 
    char doNothingLabel[MAX_TEMPORARY_STORAGE]; sprintf(doNothingLabel, "%snothing", label );
 
    cpu_protothread_get_state( _environment, threadId->realName, threadState->realName );
    cpu_compare_and_branch_8bit_const( _environment, threadState->realName, PROTOTHREAD_STATUS_ENDED, doNothingLabel, 0 );
    cpu_protothread_set_state( _environment, threadId->realName, PROTOTHREAD_STATUS_WAITING );
    cpu_protothread_save( _environment, threadId->realName, 0 );
    
    cpu_label( _environment, doNothingLabel );
 
    return threadId;
 
}