Separated library source code from testing code, fixing #6

[rodin/chimara.git] / libchimara / abort.c

diff --git a/libchimara/abort.c b/libchimara/abort.c
new file mode 100644 (file)
index 0000000..61234a0
--- /dev/null
+++ b/libchimara/abort.c
@@ -0,0 +1,71 @@
+#include "event.h"
+#include <glib.h>
+#include <gtk/gtk.h>
+
+#include "chimara-glk-private.h"
+
+extern ChimaraGlkPrivate *glk_data;
+
+/**
+ * glk_set_interrupt_handler:
+ * @func: A pointer to an interrupt handler function.
+ *
+ * Sets @func to be the interrupt handler. @func should be a pointer to a 
+ * function which takes no argument and returns no result. If Glk receives an
+ * interrupt, and you have set an interrupt handler, your handler will be 
+ * called, before the process is shut down.
+ * 
+ * Initially there is no interrupt handler. You can reset to not having any by
+ * calling <code>#glk_set_interrupt_handler(%NULL)</code>.
+ * 
+ * If you call glk_set_interrupt_handler() with a new handler function while an
+ * older one is set, the new one replaces the old one. Glk does not try to queue
+ * interrupt handlers.
+ *
+ * You should not try to interact with the player in your interrupt handler. Do
+ * not call glk_select() or glk_select_poll(). Anything you print to a window
+ * may not be visible to the player. 
+ */
+void
+glk_set_interrupt_handler(void (*func)(void))
+{
+       glk_data->interrupt_handler = func;
+}
+
+/* Internal function: abort this Glk program, freeing resources and calling the
+user's interrupt handler. */
+static void
+abort_glk()
+{
+       if(glk_data->interrupt_handler)
+               (*(glk_data->interrupt_handler))();
+       g_signal_emit_by_name(glk_data->self, "stopped");
+       g_thread_exit(NULL);
+}
+
+/* Internal function: Signal this Glk thread to abort. Does nothing if the abort
+mutex has already been freed. (That means the thread already ended.) */
+void
+signal_abort()
+{
+       if(glk_data && glk_data->abort_lock) {
+               g_mutex_lock(glk_data->abort_lock);
+               glk_data->abort_signalled = TRUE;
+               g_mutex_unlock(glk_data->abort_lock);
+               /* Stop blocking on the event queue condition */
+               event_throw(evtype_Abort, NULL, 0, 0);
+       }
+}
+
+/* Internal function: check if the Glk program has been interrupted. */
+void
+check_for_abort()
+{
+       g_mutex_lock(glk_data->abort_lock);
+       if(glk_data->abort_signalled) 
+       {
+               g_mutex_unlock(glk_data->abort_lock);
+               abort_glk();
+       }
+       g_mutex_unlock(glk_data->abort_lock);
+}