Allows us to control multithreaded access and spurious wakeups easier.
closes#509
Switches DS to use new waitForData functionality
Adds a few new functions
HAL_GetPort both allocates the DIO and sets the DIO into DIO mode. The DIO setting was overriding the SPI setting on the port, so SPI chip selects were broken if you had more than one. Instead use CreatePortHandleForSPI, which is a special function that only allocates the DIO handle, but doesn't actually set the DIO into DIO mode.
The exceptions were removed from Java because these fail more often then
not. Teams are noticing this in C++ as well. In addition for some reason
ClearErrors() is causing about 0.5 seconds of lag. That's another issue,
but this will match Java and solve that issue for users.
Would throw if the camera was disconnected. We handle this properly at
the JNI level to not have this crash the entire program, but the error
is still kind of annoying, and not really an error.
Unfortunately, due to the way NT synchronization is currently performed,
this has unexpected and undesirable behavior: when a dashboard (or any other
NT client) is left running between code restarts, when it reconnects, any
code settings will be overwritten by the NT synchronization process. As
fixing this will require a fairly major NT change (and likely a user-visible
one), it's not desirable to do at this point in the year.
Instead, disable NT driven settings entirely (e.g. make the NT interface
publish only). To emphasize the read-only nature of the NT values, attempts
to change the NT values will be immediately overridden by CameraServer.
To better inform users about the actual property names (e.g. for use in their
code), the "raw_" settings no longer have "raw_" removed from their names
(they are still placed in the "RawProperty" subtable).
This change also contains a couple of Java fixes:
* Make getInstance() thread-safe
* Properly synchronize access to m_tables between multiple threads.
* Use Hashtable instead of HashMap.
* Java SendableChooser now decorates with type (non-breaking change)
* C++ SendableChooser now is templated on the type instead of using void* and stores values (breaking change)
* C++ SendableChooser now uses llvm::StringMap instead of std::map
