lib: make glib initialization thread-safe

In principle this could be done without depending on C++11 features,
but these features should be available since gcc 4.8.1, and this
localized usage is easy to replace if it turns out to be problematic
for portability.

1 files changed, 21 insertions, 0 deletions

diff --git a/lib/init.cc b/lib/init.cc
new file mode 100644
index 00000000..cf29200f
--- /dev/null
+++ b/lib/init.cc
@@ -0,0 +1,21 @@
+#include "notmuch-private.h"
+
+#include <mutex>
+
+static void do_init ()
+{
+    /* Initialize the GLib type system and threads */
+#if ! GLIB_CHECK_VERSION (2, 35, 1)
+    g_type_init ();
+#endif
+
+    g_mime_init ();
+    _notmuch_filter_init ();
+}
+
+void
+_notmuch_init ()
+{
+    static std::once_flag initialized;
+    std::call_once (initialized, do_init);
+}