RemoteServer and PluginManager side would need complete redesign to be
data race free and concurrent. But as that would be unlikely to be
required from DFHack I decided simpler solution that is fixing data
ownership to a thread and all ServerConnection share a single lock which
allows access to PluginManager and Core.
This moves code intended to infer biome type currently living in a
couple of plugins into the Maps module, so that this code can be shared
more easily by multiple plugins, as discussed in #1392.
The runtime debug print filtering support dynamic debug print selection.
Tis patch only implements basic core support for filtering. The commands
to change the runtime filtering settings will be added in a following
patch.
But even with only this one can change filtering settings by editing
memory using a debugger. It can even be automated by using gdb break
point commands.
- Use port from remote-server.json in dfhack-run
- Make DFHACK_RUN environment variable take priority over remote-server.json
- Log current port to stderr
The bools could use acquire&release memory order or even relaxed but I
didn't think code was worth auditing for such low level optimizations.
Sequantial consistent is fast enough but much harder to use incorrectly.
The timeLast is protected by CoreSuspender lock. plugin_update is only
called when CoreSuspender lock is held.
The last_menu is protected by trackmenu_flg loads and stores.
The old CoreSuspender requires processing from Core::Update to allow
commands execute. But that causes issues if Core::Shutdown wants
quarentee cleanup order with std:🧵:join. Fixing shutdown ordering
adds too many branches to already fairly complex code.
I decided to try to refactor CoreSuspender to use simpler locking
locking using a std::recusive_muted as primary synchronization
primitive.
To help control when Core::Update unlocks the primary mutex there is
std::contition_variable_any and std::atomic<size_t> queue lenght
counter.
The last state variable is std::atomic<std:🧵:id> that is used to
keep track of owner thread for Core::IsSuspended query.
This should be merged only just after a release to make sure that it
gets maximum testing in develop branch before next release.
Fixes#1066
There is a minor chance that console or init thread would access already
freed memory when core is shutting down and cleaning up state. To avoid
any danger of having random bugs caused by the potential data race I
decided to make sure the shutdown code waits for the thread to exit
first.
Windows change is completely untested. It is purely based on msdn
documentation.
I noticed that tthread is missing some c++11 features that make thread
handling code a bit easier. To be able to use those features I decided
to convert Core.cpp to use equivalent standard classes.
This patch has no functional changes.
command-prompt viewscreen may affect command execution if they are
looking for UI state. To make commands execute simillary to hotkeys or
console commands the viewscreen needs to removed from the top position.
Fixes#1194
lethosor
Pauli
Kelly Kinkade
Lethosor
Ben Lubar
Stoyan Gaydarov