#ifdef G_OS_UNIX
#include "glib-unix.h"
+#include <pthread.h>
#ifdef HAVE_EVENTFD
#include <sys/eventfd.h>
#endif
* <graphic fileref="mainloop-states.gif" format="GIF"></graphic>
* </figure>
* </refsect2>
+ *
+ * On Unix, the GLib mainloop is incompatible with fork(). Any program
+ * using the mainloop must either exec() or exit() from the child
+ * without returning to the mainloop.
*/
/* Types */
gpointer user_data);
static GMainContext *glib_worker_context;
+static gboolean g_main_context_fork_detected;
G_LOCK_DEFINE_STATIC (main_loop);
static GMainContext *default_main_context;
g_free (context);
}
+#ifdef G_OS_UNIX
+static void
+g_main_context_forked (void)
+{
+ g_main_context_fork_detected = TRUE;
+}
+#endif
+
/**
* g_main_context_new:
*
GMainContext *
g_main_context_new (void)
{
+ static gsize initialised;
GMainContext *context;
g_thread_init_glib ();
- context = g_new0 (GMainContext, 1);
-
+ if (g_once_init_enter (&initialised))
+ {
#ifdef G_MAIN_POLL_DEBUG
- {
- static gboolean beenhere = FALSE;
+ if (getenv ("G_MAIN_POLL_DEBUG") != NULL)
+ _g_main_poll_debug = TRUE;
+#endif
- if (!beenhere)
- {
- if (getenv ("G_MAIN_POLL_DEBUG") != NULL)
- _g_main_poll_debug = TRUE;
- beenhere = TRUE;
- }
- }
+#ifdef G_OS_UNIX
+ pthread_atfork (NULL, NULL, g_main_context_forked);
#endif
+ g_once_init_leave (&initialised, TRUE);
+ }
+
+ context = g_new0 (GMainContext, 1);
+
g_static_mutex_init (&context->mutex);
context->owner = NULL;
if (!block)
timeout = 0;
+ g_assert (!g_main_context_fork_detected);
g_main_context_poll (context, timeout, max_priority, fds, nfds);
some_ready = g_main_context_check (context, max_priority, fds, nfds);