#include "event.h"
+#include "magic.h"
+#include "glk.h"
+#include <string.h>
-static GQueue *event_queue = NULL;
-static GMutex *event_lock = NULL;
-static GCond *event_queue_not_empty = NULL;
-static GCond *event_queue_not_full = NULL;
+#include "chimara-glk-private.h"
-void
-events_init()
-{
- event_queue = g_queue_new();
- event_lock = g_mutex_new();
- event_queue_not_empty = g_cond_new();
- event_queue_not_full = g_cond_new();
-}
+extern ChimaraGlkPrivate *glk_data;
-static void
-event_free(gpointer data, gpointer user_data)
-{
- g_free(data);
-}
-
-void
-events_free()
-{
- g_queue_foreach(event_queue, event_free, NULL);
- g_queue_free(event_queue);
- g_mutex_free(event_lock);
- g_cond_free(event_queue_not_empty);
- g_cond_free(event_queue_not_full);
-}
+#define EVENT_TIMEOUT_MICROSECONDS (3000000)
+/* Internal function: push an event onto the event queue. If the event queue is
+full, wait for max three seconds and then drop the event. If the event queue is
+NULL, i.e. freed, then fail silently. */
void
event_throw(glui32 type, winid_t win, glui32 val1, glui32 val2)
{
+ if(!glk_data->event_queue)
+ return;
+
GTimeVal timeout;
g_get_current_time(&timeout);
- g_time_val_add(&timeout, 3000000); /* 3 Seconds */
+ g_time_val_add(&timeout, EVENT_TIMEOUT_MICROSECONDS);
+
+ g_mutex_lock(glk_data->event_lock);
/* Wait for room in the event queue */
- g_mutex_lock(event_lock);
- if( g_queue_get_length(event_queue) >= EVENT_QUEUE_MAX_LENGTH ) {
- if( !g_cond_timed_wait(event_queue_not_full, event_lock, &timeout) ) {
- /* Drop the event */
- g_mutex_unlock(event_lock);
+ while( g_queue_get_length(glk_data->event_queue) >= EVENT_QUEUE_MAX_LENGTH )
+ if( !g_cond_timed_wait(glk_data->event_queue_not_full, glk_data->event_lock, &timeout) )
+ {
+ /* Drop the event after 3 seconds */
+ g_mutex_unlock(glk_data->event_lock);
return;
}
- }
event_t *event = g_new0(event_t, 1);
event->type = type;
event->win = win;
event->val1 = val1;
event->val2 = val2;
-
- g_queue_push_head(event_queue, event);
+ g_queue_push_head(glk_data->event_queue, event);
/* Signal that there is an event */
- g_cond_signal(event_queue_not_empty);
+ g_cond_signal(glk_data->event_queue_not_empty);
- g_mutex_unlock(event_lock);
+ g_mutex_unlock(glk_data->event_lock);
}
+/**
+ * glk_select:
+ * @event: Pointer to an #event_t.
+ *
+ * Causes the program to wait for an event, and then store it in the structure
+ * pointed to by @event. Unlike most Glk functions that take pointers, the
+ * argument of glk_select() may not be %NULL.
+ *
+ * Most of the time, you only get the events that you request. However, there
+ * are some events which can arrive at any time. This is why you must always
+ * call glk_select() in a loop, and continue the loop until you get the event
+ * you really want.
+ */
void
glk_select(event_t *event)
{
- event_t *retrieved_event;
-
g_return_if_fail(event != NULL);
- g_mutex_lock(event_lock);
+ g_mutex_lock(glk_data->event_lock);
/* Wait for an event */
- if( g_queue_is_empty(event_queue) ) {
- g_cond_wait(event_queue_not_empty, event_lock);
+ while( g_queue_is_empty(glk_data->event_queue) )
+ g_cond_wait(glk_data->event_queue_not_empty, glk_data->event_lock);
+
+ event_t *retrieved_event = g_queue_pop_tail(glk_data->event_queue);
+ if(retrieved_event == NULL)
+ {
+ g_mutex_unlock(glk_data->event_lock);
+ WARNING("Retrieved NULL event from non-empty event queue");
+ return;
}
-
- retrieved_event = g_queue_pop_tail(event_queue);
- g_return_if_fail(retrieved_event != NULL);
-
- event->type = retrieved_event->type;
- event->win = retrieved_event->win;
- event->val1 = retrieved_event->val1;
- event->val2 = retrieved_event->val2;
-
+ memcpy(event, retrieved_event, sizeof(event_t));
g_free(retrieved_event);
/* Signal that the event queue is no longer full */
- g_cond_signal(event_queue_not_full);
-
- g_mutex_unlock(event_lock);
-
- /* Implementation defined events */
- switch(event->type) {
- case EVENT_TYPE_QUIT:
- g_thread_exit(NULL);
- }
+ g_cond_signal(glk_data->event_queue_not_full);
+
+ g_mutex_unlock(glk_data->event_lock);
+
+ /* Check for interrupt */
+ glk_tick();
+
+ /* If an abort event was generated, the thread should have exited by now */
+ g_assert(event->type != evtype_Abort);
}
+