some infra

third_party/concord/concord-once.h

@@ -0,0 +1,49 @@
+/**
+ * @file concord-once.h
+ * @author Cogmasters
+ * @brief Initialized once
+ */
+
+#ifndef CONCORD_ONCE_H
+#define CONCORD_ONCE_H
+
+#include "concord-error.h"
+
+/** Callback function type for user initialization */
+typedef CCORDcode (*ccord_once_cb)(long flags);
+
+/**
+ * @brief Register a user callback for initialization
+ *
+ * This callback will be executed exactly once during initialization
+ * after all internal initializations have been performed.
+ * Multiple callbacks can be registered from different modules, and they will
+ * be executed in the order they were registered.
+ *
+ * @param callback The function to call during initialization
+ * @param flags Flag to pass to the callback, that will be passed to the
+ *      callback function
+ * @CCORD_return
+ */
+CCORDcode ccord_once_set_callback(ccord_once_cb callback, long flags);
+
+/**
+ * @brief Initialize context once
+ *
+ * @param once Pointer to a static boolean flag that will be set to true if the
+ *      initialization was successful. This flag should be used to ensure that
+ *      the initialization is only performed once.
+ * @CCORD_return
+ */
+CCORDcode ccord_once(_Bool *once);
+
+/**
+ * @brief Cleanup once context
+ *
+ * This function will be called to cleanup the once context.
+ * It will be called when the program is exiting, and it will
+ * cleanup all registered callbacks.
+ */
+void ccord_once_cleanup(void);
+
+#endif /* CONCORD_ONCE_H */