Value
Parser::parse()
{
switch (eats()) {
case '(':
read(); return list();
case '\'':
read(); return quoted(sym_quote);
case '`':
read(); return quoted(sym_quasiquote);
case ',':
read();
if (c == '@') {
read();
return quoted(sym_unquote_splicing);
}
else
return quoted(sym_unquote);
case ')':
parse_error("too many right-parens");
case EOF:
parse_error("unexpected end of file");
}
return atom();
}
// The print out of info for each animal
// will either print the default message or custom one from a subclass
void Zoo::info(){
printName();
has4Legs();
printName();
eats();
printName();
hasFur();
}
Value
Parser::list()
{
Value p = NIL, t = NIL, x;
while (eats() != ')') {
x = parse();
p = cons(x, p);
if (eats() == '.') {
if (next() == ')')
parse_error("nothing after dot");
t = parse();
if (eats() != ')')
parse_error("after dot terminator");
}
}
read();
return reverse(p, t);
}
static void thinks(t_philo *philo,
pthread_mutex_t *mutex)
{
printf(THINK_MSG);
sleep(TIME_THINK);
while (philo->hungry < MAX_HUNGRY)
{
if (pthread_mutex_trylock(mutex) == 0)
{
eats(philo);
return ;
}
sleep(TIME_THINK);
philo->hungry++;
}
}
int
Parser::next()
{
read();
return eats();
}
bool
Parser::eof()
{
eats();
return c == EOF;
}
/* A philosopher thread function, called out of CSdispatch */
STATUS
philosopher(
i4 mode,
MY_SCB *scb,
i4 *next_mode)
{
i4 bites = 0;
#ifdef EX_DEBUG
EX_CONTEXT context;
if (EXdeclare(ex_handler, &context) != OK) {
/* some exception was raised */
Psem( &SIsem );
SIfprintf( stderr,"Error: unexpected exception in philosopher()...");
Vsem( &SIsem );
EXdelete();
return FAIL;
}
#endif
switch( mode )
{
case CS_INITIATE: /* A new philsopher is born */
scb->phil = Threads++;
status[scb->phil] = mode;
while( bites < NBITES )
{
getsticks( scb->phil );
eats( scb->phil );
bites++;
freesticks( scb->phil );
thinks( scb->phil );
}
/* fall into: */
default:
*next_mode = CS_TERMINATE;
break;
case CS_TERMINATE:
if( Noisy )
{
# ifdef EX_SIG_DEBUG
signal(SIGUSR1, intfunc);
if (scb->phil == 1) {
SIfprintf(stderr, "Send a signal #%d to process #%d\n",
SIGUSR1, getpid());
pause();
}
# endif /* EX_SIG_DEBUG */
Psem( &SIsem );
SIfprintf(stderr, "%d (%s) dies, RIP.\n",
scb->phil, Names[ scb->phil ] );
if ( status[scb->phil] == mode )
{
SIfprintf(stderr, "Oops this philosopher is already dead?\n");
SIfprintf(stderr, "\t\t CS code is non-functional\n");
}
Vsem( &SIsem );
}
*next_mode = CS_TERMINATE;
/* If no more threads, shutdown */
status[scb->phil] = mode;
if( --Threads == 0 ) {
/* Everyone else should be dead, no semaphore needed. */
SIflush( stderr );
CSterminate( CS_KILL, (i4 *)NULL );
}
break;
}
#ifdef EX_DEBUG
EXdelete();
#endif
return( OK );
}
