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ports: avoid adding port table entries and finalizers if possible

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* libguile/ports.h (scm_t_port_type_flags, scm_t_ptob_descriptor): Add
  flags to ptob descriptors.

* libguile/ports.c (scm_set_port_flush): Set the SCM_PORT_TYPE_HAS_FLUSH
  flag here.
  (scm_c_make_port_with_encoding): Only add ports to the table if
  SCM_PORT_TYPE_HAS_FLUSH is set.  Only add finalizers to ports if there
  is a free function.
  (scm_close_port): Inline scm_i_remove_port here.  Only remove from the
  weak set if SCM_PORT_TYPE_HAS_FLUSH is set.
  (scm_set_port_revealed_x): Add a comment.
This commit is contained in:
Andy Wingo 2012-02-14 14:01:52 +01:00
parent 6c98257f2e
commit 03a2eeb0cc
2 changed files with 37 additions and 33 deletions
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61
libguile/ports.c
View file

@ -250,7 +250,9 @@ scm_set_port_close (scm_t_bits tc, int (*close) (SCM))
void
scm_set_port_flush (scm_t_bits tc, void (*flush) (SCM port))
{
scm_c_port_type_ref (SCM_TC2PTOBNUM (tc))->flush = flush;
scm_t_ptob_descriptor *ptob = scm_c_port_type_ref (SCM_TC2PTOBNUM (tc));
ptob->flush = flush;
ptob->flags |= SCM_PORT_TYPE_HAS_FLUSH;
}
void
@ -612,10 +614,10 @@ scm_c_make_port_with_encoding (scm_t_bits tag, unsigned long mode_bits,
entry->ilseq_handler = handler;
entry->iconv_descriptors = NULL;
if (SCM_PORT_DESCRIPTOR (ret)->flags & SCM_PORT_TYPE_HAS_FLUSH)
scm_weak_set_add_x (scm_i_port_weak_set, ret);
/* For each new port, register a finalizer so that it port type's free
function can be invoked eventually. */
if (SCM_PORT_DESCRIPTOR (ret)->free)
register_finalizer_for_port (ret);
return ret;
@ -636,33 +638,6 @@ scm_new_port_table_entry (scm_t_bits tag)
return scm_c_make_port (tag, 0, 0);
}
/* Remove a port from the table and destroy it. */
static void close_iconv_descriptors (scm_t_iconv_descriptors *id);
static void
scm_i_remove_port (SCM port)
#define FUNC_NAME "scm_remove_port"
{
scm_t_port *p;
p = SCM_PTAB_ENTRY (port);
scm_port_non_buffer (p);
SCM_SETPTAB_ENTRY (port, 0);
scm_weak_set_remove_x (scm_i_port_weak_set, port);
p->putback_buf = NULL;
p->putback_buf_size = 0;
if (p->iconv_descriptors)
{
close_iconv_descriptors (p->iconv_descriptors);
p->iconv_descriptors = NULL;
}
}
#undef FUNC_NAME
/* Predicates. */
@ -727,6 +702,8 @@ SCM_DEFINE (scm_eof_object_p, "eof-object?", 1, 0, 0,
/* Closing ports. */
static void close_iconv_descriptors (scm_t_iconv_descriptors *id);
/* scm_close_port
* Call the close operation on a port object.
* see also scm_close.
@ -741,6 +718,7 @@ SCM_DEFINE (scm_close_port, "close-port", 1, 0, 0,
"descriptors.")
#define FUNC_NAME s_scm_close_port
{
scm_t_port *p;
int rv;
port = SCM_COERCE_OUTPORT (port);
@ -752,8 +730,26 @@ SCM_DEFINE (scm_close_port, "close-port", 1, 0, 0,
rv = SCM_PORT_DESCRIPTOR (port)->close (port);
else
rv = 0;
scm_i_remove_port (port);
p = SCM_PTAB_ENTRY (port);
scm_port_non_buffer (p);
SCM_SETPTAB_ENTRY (port, 0);
if (SCM_PORT_DESCRIPTOR (port)->flags & SCM_PORT_TYPE_HAS_FLUSH)
scm_weak_set_remove_x (scm_i_port_weak_set, port);
p->putback_buf = NULL;
p->putback_buf_size = 0;
if (p->iconv_descriptors)
{
close_iconv_descriptors (p->iconv_descriptors);
p->iconv_descriptors = NULL;
}
SCM_CLR_PORT_OPEN_FLAG (port);
return scm_from_bool (rv >= 0);
}
#undef FUNC_NAME
@ -1254,6 +1250,9 @@ SCM_DEFINE (scm_set_port_revealed_x, "set-port-revealed!", 2, 0, 0,
int r;
scm_i_pthread_mutex_t *lock;
/* FIXME: It doesn't make sense to manipulate revealed counts on ports
without a free function. */
port = SCM_COERCE_OUTPORT (port);
SCM_VALIDATE_OPENPORT (1, port);
r = scm_to_int (rcount);

5
libguile/ports.h
View file

@ -191,6 +191,10 @@ SCM_INTERNAL SCM scm_i_port_weak_set;
typedef enum scm_t_port_type_flags {
SCM_PORT_TYPE_HAS_FLUSH = 1 << 0
} scm_t_port_type_flags;
/* port-type description. */
typedef struct scm_t_ptob_descriptor
{
@ -211,6 +215,7 @@ typedef struct scm_t_ptob_descriptor
scm_t_off (*seek) (SCM port, scm_t_off OFFSET, int WHENCE);
void (*truncate) (SCM port, scm_t_off length);
unsigned flags;
} scm_t_ptob_descriptor;
#define SCM_TC2PTOBNUM(x) (0x0ff & ((x) >> 8))