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