The file I/O versions of cancelRead and cancelWrite in eventcore currently do not reliably cancel the operation in a synchronous fashion, leading to continued buffer accesses after the cancellation call. In case of the Windows version, this also means that the OVERLAPPED structure can be illegally reused for the next operation, while the previous one hasn't been canceled, yet.
A solution to this issue may require a fundamental change in the file I/O API of eventcore, and the optimal design of that still needs to be worked out. For this reason, we simply avoid using the cancellation functions in vibe-core for now to avoid memory corruption issues. This does mean that interrupting a task that does file I/O won't work anymore.
Instead of asyncWork, now uses a worker task directly and signals the finalization of the result using message passing. This avoids the roundtrip required to return the task handle, as well as the heap allocated result buffer of Future!T.
Instead of starting at zero, start at the current file size. This offset
is stored in FileStream. It is only an approximation because concurrent
writes could advance the file without FileStream's knowledge.
Add a test that shows that the offset is approximated as expected and that
appending to an existing file works, too.
This is also a regression test which shows that appending to an existing
file works as expected. See vibe-d/eventcore#115.
Avoids listDirectory/iterateDirectory getting interrupted when stumbling over inaccessible files. The `name` field of the returned file info value is always set, so that these files can still be identified.
This change modifies destructors to anticipate that they can be called form a foreign thread if the GC is involved. The actual release of the reference will then happen deferred in the original thread.
The previous design, while intended as an improvement over the one-size-fits all Path struct of vibe-d:core, turned out to produce lots of bugs during the transition, because of missing Path.type checks.
The new design uses a cleaner approach, where the static type of a path value encodes the path format. An explicit cast is necessary to convert between different path types. The internet path type also performs proper validation and percent encoding, so that InetPath.toString() always produces a valid URI path.
This simplifies the logic by separating thread local notifications from cross-thread notifications, as well as replacing lockless operations by a spin lock. The thread local variant of ManualEvent is now also separated into a LocalManualEvent type.
The library is able to support simple TCP servers in the current state. The API is still mostly compatible with mainline vibe.d, but the driver systen has been replaced by the eventcore library and sockets/files/timers/... are now structs with automatic reference counting instead of GC collected classes. The stream interfaces have been removed for now.
