suspend.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");
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/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/

/* <usermanual>
@keyword SUSPEND
 
@english
 
This statement can be used to temporarily suspend the execution of a 
thread. The thread will stop executing until it receives the ''RESUME''
command. When queried with the ''RUNNING'' function, the thread will 
be reported as "not running".
 
@italian
 
Questa istruzione può essere utilizzata per sospendere temporaneamente 
l'esecuzione di un thread. Il thread interromperà la propria esecuzione 
fino al ricevimento del comando ''RESUME''. Se interrogato con la 
funzione ''RUNNING'', il thread risulterà "non in esecuzione".
 
@syntax SUSPEND thread
 
@example handle = SPAWN moveShip
@example SUSPEND handle
 
@target all
</usermanual> */
void suspend_vars( Environment * _environment, char * _thread ) {
 
    MAKE_LABEL
 
    Variable * threadId = variable_retrieve( _environment, _thread );
 
    char doNothingLabel[MAX_TEMPORARY_STORAGE]; sprintf( doNothingLabel, "%snothing", label );
 
    Variable * status = variable_temporary( _environment, VT_BYTE, "(status)" );
 
    cpu_protothread_get_state( _environment, threadId->realName, status->realName );
 
    cpu_compare_and_branch_8bit_const( _environment, status->realName, PROTOTHREAD_STATUS_YIELDED, doNothingLabel, 0 );
 
    cpu_protothread_set_state( _environment, threadId->realName, PROTOTHREAD_STATUS_PAUSED );
 
    cpu_label( _environment, doNothingLabel );
    
}