trylock
Tries to lock @mutex. If @mutex is already locked by another thread, it immediately returns false. Otherwise it locks @mutex and returns true.
#GMutex is neither guaranteed to be recursive nor to be non-recursive. As such, calling g_mutex_lock() on a #GMutex that has already been locked by the same thread results in undefined behaviour (including but not limited to deadlocks or arbitrary return values).
Return
true if @mutex could be locked