Unlocks @rec_mutex. If another thread is blocked in a g_rec_mutex_lock() call for @rec_mutex, it will become unblocked and can lock @rec_mutex itself.
Calling g_rec_mutex_unlock() on a recursive mutex that is not locked by the current thread leads to undefined behaviour.
2.32
See Implementation
Unlocks @rec_mutex. If another thread is blocked in a g_rec_mutex_lock() call for @rec_mutex, it will become unblocked and can lock @rec_mutex itself.
Calling g_rec_mutex_unlock() on a recursive mutex that is not locked by the current thread leads to undefined behaviour.