mirror of
https://gitlab.gnome.org/GNOME/glib.git
synced 2024-12-25 23:16:14 +01:00
gmain: Avoid some lock/unlock dance during g_main_context_iterate
A context iteration we're doing lots of lock/unlocks and that's fine to give other threads contexts a chance to run, but we're doing it also just to call other functions that require locking, and this can be avoided. Other threads can still have a chance to run while releasing the ownership of the context.
This commit is contained in:
Marco Trevisan (Treviño)
parent
fe2de360de
commit
e7c2ead41b
198
glib/gmain.c
198
glib/gmain.c
@ -446,11 +446,25 @@ static void g_source_set_priority_unlocked (GSource *source,
|
||||
static void g_child_source_remove_internal (GSource *child_source,
|
||||
GMainContext *context);
|
||||
|
||||
static void g_main_context_poll (GMainContext *context,
|
||||
gint timeout,
|
||||
gint priority,
|
||||
GPollFD *fds,
|
||||
gint n_fds);
|
||||
static gboolean g_main_context_acquire_unlocked (GMainContext *context);
|
||||
static void g_main_context_release_unlocked (GMainContext *context);
|
||||
static gboolean g_main_context_prepare_unlocked (GMainContext *context,
|
||||
gint *priority);
|
||||
static gint g_main_context_query_unlocked (GMainContext *context,
|
||||
gint max_priority,
|
||||
gint *timeout,
|
||||
GPollFD *fds,
|
||||
gint n_fds);
|
||||
static gboolean g_main_context_check_unlocked (GMainContext *context,
|
||||
gint max_priority,
|
||||
GPollFD *fds,
|
||||
gint n_fds);
|
||||
static void g_main_context_dispatch_unlocked (GMainContext *context);
|
||||
static void g_main_context_poll_unlocked (GMainContext *context,
|
||||
int timeout,
|
||||
int priority,
|
||||
GPollFD *fds,
|
||||
int n_fds);
|
||||
static void g_main_context_add_poll_unlocked (GMainContext *context,
|
||||
gint priority,
|
||||
GPollFD *fd);
|
||||
@ -3523,13 +3537,24 @@ gboolean
|
||||
g_main_context_acquire (GMainContext *context)
|
||||
{
|
||||
gboolean result = FALSE;
|
||||
GThread *self = G_THREAD_SELF;
|
||||
|
||||
if (context == NULL)
|
||||
context = g_main_context_default ();
|
||||
|
||||
LOCK_CONTEXT (context);
|
||||
|
||||
result = g_main_context_acquire_unlocked (context);
|
||||
|
||||
UNLOCK_CONTEXT (context);
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
static gboolean
|
||||
g_main_context_acquire_unlocked (GMainContext *context)
|
||||
{
|
||||
GThread *self = G_THREAD_SELF;
|
||||
|
||||
if (!context->owner)
|
||||
{
|
||||
context->owner = self;
|
||||
@ -3540,16 +3565,13 @@ g_main_context_acquire (GMainContext *context)
|
||||
if (context->owner == self)
|
||||
{
|
||||
context->owner_count++;
|
||||
result = TRUE;
|
||||
return TRUE;
|
||||
}
|
||||
else
|
||||
{
|
||||
TRACE (GLIB_MAIN_CONTEXT_ACQUIRE (context, FALSE /* failure */));
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
UNLOCK_CONTEXT (context);
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
@ -3570,6 +3592,14 @@ g_main_context_release (GMainContext *context)
|
||||
|
||||
LOCK_CONTEXT (context);
|
||||
|
||||
g_main_context_release_unlocked (context);
|
||||
|
||||
UNLOCK_CONTEXT (context);
|
||||
}
|
||||
|
||||
static void
|
||||
g_main_context_release_unlocked (GMainContext *context)
|
||||
{
|
||||
context->owner_count--;
|
||||
if (context->owner_count == 0)
|
||||
{
|
||||
@ -3592,8 +3622,6 @@ g_main_context_release (GMainContext *context)
|
||||
g_mutex_unlock (waiter->mutex);
|
||||
}
|
||||
}
|
||||
|
||||
UNLOCK_CONTEXT (context);
|
||||
}
|
||||
|
||||
static gboolean
|
||||
@ -3706,24 +3734,36 @@ gboolean
|
||||
g_main_context_prepare (GMainContext *context,
|
||||
gint *priority)
|
||||
{
|
||||
guint i;
|
||||
gint n_ready = 0;
|
||||
gint current_priority = G_MAXINT;
|
||||
GSource *source;
|
||||
GSourceIter iter;
|
||||
gboolean ready;
|
||||
|
||||
if (context == NULL)
|
||||
context = g_main_context_default ();
|
||||
|
||||
LOCK_CONTEXT (context);
|
||||
|
||||
ready = g_main_context_prepare_unlocked (context, priority);
|
||||
|
||||
UNLOCK_CONTEXT (context);
|
||||
|
||||
return ready;
|
||||
}
|
||||
|
||||
static gboolean
|
||||
g_main_context_prepare_unlocked (GMainContext *context,
|
||||
gint *priority)
|
||||
{
|
||||
guint i;
|
||||
gint n_ready = 0;
|
||||
gint current_priority = G_MAXINT;
|
||||
GSource *source;
|
||||
GSourceIter iter;
|
||||
|
||||
context->time_is_fresh = FALSE;
|
||||
|
||||
if (context->in_check_or_prepare)
|
||||
{
|
||||
g_warning ("g_main_context_prepare() called recursively from within a source's check() or "
|
||||
"prepare() member.");
|
||||
UNLOCK_CONTEXT (context);
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
@ -3736,7 +3776,6 @@ g_main_context_prepare (GMainContext *context,
|
||||
if (dispatch)
|
||||
g_main_dispatch (context, ¤t_time);
|
||||
|
||||
UNLOCK_CONTEXT (context);
|
||||
return TRUE;
|
||||
}
|
||||
#endif
|
||||
@ -3854,8 +3893,6 @@ g_main_context_prepare (GMainContext *context,
|
||||
g_source_iter_clear (&iter);
|
||||
|
||||
TRACE (GLIB_MAIN_CONTEXT_AFTER_PREPARE (context, current_priority, n_ready));
|
||||
|
||||
UNLOCK_CONTEXT (context);
|
||||
|
||||
if (priority)
|
||||
*priority = current_priority;
|
||||
@ -3893,14 +3930,30 @@ g_main_context_query (GMainContext *context,
|
||||
gint n_fds)
|
||||
{
|
||||
gint n_poll;
|
||||
GPollRec *pollrec, *lastpollrec;
|
||||
gushort events;
|
||||
|
||||
if (context == NULL)
|
||||
context = g_main_context_default ();
|
||||
|
||||
LOCK_CONTEXT (context);
|
||||
|
||||
n_poll = g_main_context_query_unlocked (context, max_priority, timeout, fds, n_fds);
|
||||
|
||||
UNLOCK_CONTEXT (context);
|
||||
|
||||
return n_poll;
|
||||
}
|
||||
|
||||
static gint
|
||||
g_main_context_query_unlocked (GMainContext *context,
|
||||
gint max_priority,
|
||||
gint *timeout,
|
||||
GPollFD *fds,
|
||||
gint n_fds)
|
||||
{
|
||||
gint n_poll;
|
||||
GPollRec *pollrec, *lastpollrec;
|
||||
gushort events;
|
||||
|
||||
TRACE (GLIB_MAIN_CONTEXT_BEFORE_QUERY (context, max_priority));
|
||||
|
||||
/* fds is filled sequentially from poll_records. Since poll_records
|
||||
@ -3957,8 +4010,6 @@ g_main_context_query (GMainContext *context,
|
||||
TRACE (GLIB_MAIN_CONTEXT_AFTER_QUERY (context, context->timeout,
|
||||
fds, n_poll));
|
||||
|
||||
UNLOCK_CONTEXT (context);
|
||||
|
||||
return n_poll;
|
||||
}
|
||||
|
||||
@ -3989,6 +4040,23 @@ g_main_context_check (GMainContext *context,
|
||||
gint max_priority,
|
||||
GPollFD *fds,
|
||||
gint n_fds)
|
||||
{
|
||||
gboolean ready;
|
||||
|
||||
LOCK_CONTEXT (context);
|
||||
|
||||
ready = g_main_context_check_unlocked (context, max_priority, fds, n_fds);
|
||||
|
||||
UNLOCK_CONTEXT (context);
|
||||
|
||||
return ready;
|
||||
}
|
||||
|
||||
static gboolean
|
||||
g_main_context_check_unlocked (GMainContext *context,
|
||||
gint max_priority,
|
||||
GPollFD *fds,
|
||||
gint n_fds)
|
||||
{
|
||||
GSource *source;
|
||||
GSourceIter iter;
|
||||
@ -3999,13 +4067,10 @@ g_main_context_check (GMainContext *context,
|
||||
if (context == NULL)
|
||||
context = g_main_context_default ();
|
||||
|
||||
LOCK_CONTEXT (context);
|
||||
|
||||
if (context->in_check_or_prepare)
|
||||
{
|
||||
g_warning ("g_main_context_check() called recursively from within a source's check() or "
|
||||
"prepare() member.");
|
||||
UNLOCK_CONTEXT (context);
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
@ -4031,7 +4096,6 @@ g_main_context_check (GMainContext *context,
|
||||
{
|
||||
TRACE (GLIB_MAIN_CONTEXT_AFTER_CHECK (context, 0));
|
||||
|
||||
UNLOCK_CONTEXT (context);
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
@ -4167,8 +4231,6 @@ g_main_context_check (GMainContext *context,
|
||||
|
||||
TRACE (GLIB_MAIN_CONTEXT_AFTER_CHECK (context, n_ready));
|
||||
|
||||
UNLOCK_CONTEXT (context);
|
||||
|
||||
return n_ready > 0;
|
||||
}
|
||||
|
||||
@ -4193,6 +4255,14 @@ g_main_context_dispatch (GMainContext *context)
|
||||
|
||||
LOCK_CONTEXT (context);
|
||||
|
||||
g_main_context_dispatch_unlocked (context);
|
||||
|
||||
UNLOCK_CONTEXT (context);
|
||||
}
|
||||
|
||||
static void
|
||||
g_main_context_dispatch_unlocked (GMainContext *context)
|
||||
{
|
||||
TRACE (GLIB_MAIN_CONTEXT_BEFORE_DISPATCH (context));
|
||||
|
||||
if (context->pending_dispatches->len > 0)
|
||||
@ -4201,16 +4271,14 @@ g_main_context_dispatch (GMainContext *context)
|
||||
}
|
||||
|
||||
TRACE (GLIB_MAIN_CONTEXT_AFTER_DISPATCH (context));
|
||||
|
||||
UNLOCK_CONTEXT (context);
|
||||
}
|
||||
|
||||
/* HOLDS context lock */
|
||||
static gboolean
|
||||
g_main_context_iterate (GMainContext *context,
|
||||
gboolean block,
|
||||
gboolean dispatch,
|
||||
GThread *self)
|
||||
g_main_context_iterate_unlocked (GMainContext *context,
|
||||
gboolean block,
|
||||
gboolean dispatch,
|
||||
GThread *self)
|
||||
{
|
||||
gint max_priority = 0;
|
||||
gint timeout;
|
||||
@ -4219,16 +4287,12 @@ g_main_context_iterate (GMainContext *context,
|
||||
GPollFD *fds = NULL;
|
||||
gint64 begin_time_nsec G_GNUC_UNUSED;
|
||||
|
||||
UNLOCK_CONTEXT (context);
|
||||
|
||||
begin_time_nsec = G_TRACE_CURRENT_TIME;
|
||||
|
||||
if (!g_main_context_acquire (context))
|
||||
if (!g_main_context_acquire_unlocked (context))
|
||||
{
|
||||
gboolean got_ownership;
|
||||
|
||||
LOCK_CONTEXT (context);
|
||||
|
||||
if (!block)
|
||||
return FALSE;
|
||||
|
||||
@ -4239,8 +4303,6 @@ g_main_context_iterate (GMainContext *context,
|
||||
if (!got_ownership)
|
||||
return FALSE;
|
||||
}
|
||||
else
|
||||
LOCK_CONTEXT (context);
|
||||
|
||||
if (!context->cached_poll_array)
|
||||
{
|
||||
@ -4251,38 +4313,33 @@ g_main_context_iterate (GMainContext *context,
|
||||
allocated_nfds = context->cached_poll_array_size;
|
||||
fds = context->cached_poll_array;
|
||||
|
||||
UNLOCK_CONTEXT (context);
|
||||
|
||||
g_main_context_prepare (context, &max_priority);
|
||||
g_main_context_prepare_unlocked (context, &max_priority);
|
||||
|
||||
while ((nfds = g_main_context_query (context, max_priority, &timeout, fds,
|
||||
allocated_nfds)) > allocated_nfds)
|
||||
while ((nfds = g_main_context_query_unlocked (
|
||||
context, max_priority, &timeout, fds,
|
||||
allocated_nfds)) > allocated_nfds)
|
||||
{
|
||||
LOCK_CONTEXT (context);
|
||||
g_free (fds);
|
||||
context->cached_poll_array_size = allocated_nfds = nfds;
|
||||
context->cached_poll_array = fds = g_new (GPollFD, nfds);
|
||||
UNLOCK_CONTEXT (context);
|
||||
}
|
||||
|
||||
if (!block)
|
||||
timeout = 0;
|
||||
|
||||
g_main_context_poll (context, timeout, max_priority, fds, nfds);
|
||||
g_main_context_poll_unlocked (context, timeout, max_priority, fds, nfds);
|
||||
|
||||
some_ready = g_main_context_check (context, max_priority, fds, nfds);
|
||||
some_ready = g_main_context_check_unlocked (context, max_priority, fds, nfds);
|
||||
|
||||
if (dispatch)
|
||||
g_main_context_dispatch (context);
|
||||
g_main_context_dispatch_unlocked (context);
|
||||
|
||||
g_main_context_release (context);
|
||||
g_main_context_release_unlocked (context);
|
||||
|
||||
g_trace_mark (begin_time_nsec, G_TRACE_CURRENT_TIME - begin_time_nsec,
|
||||
"GLib", "g_main_context_iterate",
|
||||
"Context %p, %s ⇒ %s", context, block ? "blocking" : "non-blocking", some_ready ? "dispatched" : "nothing");
|
||||
|
||||
LOCK_CONTEXT (context);
|
||||
|
||||
return some_ready;
|
||||
}
|
||||
|
||||
@ -4304,7 +4361,7 @@ g_main_context_pending (GMainContext *context)
|
||||
context = g_main_context_default();
|
||||
|
||||
LOCK_CONTEXT (context);
|
||||
retval = g_main_context_iterate (context, FALSE, FALSE, G_THREAD_SELF);
|
||||
retval = g_main_context_iterate_unlocked (context, FALSE, FALSE, G_THREAD_SELF);
|
||||
UNLOCK_CONTEXT (context);
|
||||
|
||||
return retval;
|
||||
@ -4340,7 +4397,7 @@ g_main_context_iteration (GMainContext *context, gboolean may_block)
|
||||
context = g_main_context_default();
|
||||
|
||||
LOCK_CONTEXT (context);
|
||||
retval = g_main_context_iterate (context, may_block, TRUE, G_THREAD_SELF);
|
||||
retval = g_main_context_iterate_unlocked (context, may_block, TRUE, G_THREAD_SELF);
|
||||
UNLOCK_CONTEXT (context);
|
||||
|
||||
return retval;
|
||||
@ -4476,7 +4533,7 @@ g_main_loop_run (GMainLoop *loop)
|
||||
|
||||
g_atomic_int_set (&loop->is_running, TRUE);
|
||||
while (g_atomic_int_get (&loop->is_running))
|
||||
g_main_context_iterate (loop->context, TRUE, TRUE, self);
|
||||
g_main_context_iterate_unlocked (loop->context, TRUE, TRUE, self);
|
||||
|
||||
UNLOCK_CONTEXT (loop->context);
|
||||
|
||||
@ -4548,11 +4605,11 @@ g_main_loop_get_context (GMainLoop *loop)
|
||||
|
||||
/* HOLDS: context's lock */
|
||||
static void
|
||||
g_main_context_poll (GMainContext *context,
|
||||
gint timeout,
|
||||
gint priority,
|
||||
GPollFD *fds,
|
||||
gint n_fds)
|
||||
g_main_context_poll_unlocked (GMainContext *context,
|
||||
int timeout,
|
||||
int priority,
|
||||
GPollFD *fds,
|
||||
int n_fds)
|
||||
{
|
||||
#ifdef G_MAIN_POLL_DEBUG
|
||||
GTimer *poll_timer;
|
||||
@ -4575,13 +4632,12 @@ g_main_context_poll (GMainContext *context,
|
||||
poll_timer = g_timer_new ();
|
||||
}
|
||||
#endif
|
||||
|
||||
LOCK_CONTEXT (context);
|
||||
|
||||
poll_func = context->poll_func;
|
||||
|
||||
UNLOCK_CONTEXT (context);
|
||||
ret = (*poll_func) (fds, n_fds, timeout);
|
||||
LOCK_CONTEXT (context);
|
||||
|
||||
errsv = errno;
|
||||
if (ret < 0 && errsv != EINTR)
|
||||
{
|
||||
@ -4596,8 +4652,6 @@ g_main_context_poll (GMainContext *context,
|
||||
#ifdef G_MAIN_POLL_DEBUG
|
||||
if (_g_main_poll_debug)
|
||||
{
|
||||
LOCK_CONTEXT (context);
|
||||
|
||||
g_print ("g_main_poll(%d) timeout: %d - elapsed %12.10f seconds",
|
||||
n_fds,
|
||||
timeout,
|
||||
@ -4634,8 +4688,6 @@ g_main_context_poll (GMainContext *context,
|
||||
pollrec = pollrec->next;
|
||||
}
|
||||
g_print ("\n");
|
||||
|
||||
UNLOCK_CONTEXT (context);
|
||||
}
|
||||
#endif
|
||||
} /* if (n_fds || timeout != 0) */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user