Function to be called when starting a critical initialization
section. The argument value_location must point to a static
0-initialized variable that will be set to a value other than 0 at
the end of the initialization section. In combination with
g_once_init_leave() and the unique address value_location, it can
be ensured that an initialization section will be executed only once
during a program's life time, and that concurrent threads are
blocked until initialization completed. To be used in constructs
Since 2.14
Function to be called when starting a critical initialization section. The argument value_location must point to a static 0-initialized variable that will be set to a value other than 0 at the end of the initialization section. In combination with g_once_init_leave() and the unique address value_location, it can be ensured that an initialization section will be executed only once during a program's life time, and that concurrent threads are blocked until initialization completed. To be used in constructs Since 2.14