Remove linux time types include

See merge request i4/manycore/emper!80

Florian Fischer authored 4 years ago and Florian Schmaus committed 4 years ago

On our bigboxes the build failed because both liburing.h and
linux/time_types.h define struct __kernel_time_spec.
The linux headers were added because of iwyu and are not unnecessary.

Modified-by: Florian Schmaus <flow@cs.fau.de>

fix build with locked work-stealing queues and add test

See merge request !79

Improve default read/write offset

See merge request !78

[test] fix occasional failures of SimpleDiskAndNetworkTest

See merge request !76

Remove feature_flags from test and introduce io test runner

Closes #10

See merge request !75

Add a warning when the kernel does not support IORING_FEAT_NODROP
that maybe IO request are getting lost.

To skip test if emper::IO is false the new io test runner in
tests/test-runner is introduced which checks emper::IO and skips the
test otherwise executes our normal testMain function.

Fixes #10.

The current default offset is 0 which means read/write will not
work like POSIX read/write and update the file position and instead will
always work at the beginning of the file.

Since linux v5.5 (ba04291eb66ed895f194ae5abd3748d72bf8aaea) io_uring
supports offset=-1 which behaves like pvread2/pvwrite2.
This feature is reported by IORING_FEAT_RW_CUR_POS.

By using the default offset -1 emper::io::readFile and emper::io::writeFile
will work like write/read but does also support pwrite/pread.

Concurrently connecting and creating the server socket is racy.
Now the server socket is created before any Fiber is started
removing this race.
Note: The same race is theoretically in SimpleNetworkTest and
ConcurrenctEchoTest too but I haven't observed the failure yet

[gitlab-ci] disable IO since io_uring is not available in our CI

See merge request !74

[clang-tidy] Set HeaderFilterRegex to '.*'

See merge request !73

This matches now all headers in the repository, instead of just the
ones in the emper/ subdirectory, for example the
/tests/fixtures.network.hpp header.

Minor fixes

See merge request !72

Both are semantically equivalent, and it appears that "enum struct" is
a little bit more confusing.

The operation is called 'dequeue', 'deque' is a double-ended queue.

Worker exclusive uring

See merge request !54

The echo client established X connections and start the
echo phase after all sockets are connected.

Each client Fiber measures the time from sending the message until
receiving the echo.

Empers IO design is based on a proactor pattern where each worker
can issue IO requests through its exclusive IoContext object which wraps an
io_uring instance.

IO completions are reaped at 4 places:
1. After a submit to collect inline completions
2. Before dispatching a new Fiber
3. When no new IO can be submitted because the completion queue is full
4. And by a global completer thread which gets notified about completions
   on worker IoContexts through registered eventfds

All IO requests are modeled as Future objects which can be either
instantiated and submitted manually, retrieved by POSIX-like non-blocking
or implicitly used by posix-like blocking functions.

User facing API is exported in the following headers:
* emper/io.hpp (POSIX-like)
* emper.h (POSIX-like)
* emper/io/Future.hpp

Catching short write/reads/sends and resubmitting the request without
unblocking the Fiber is supported.

Using AlarmFuture objects Fibers have a emper-native way to sleep for
a given time.

IO request timeouts with TimeoutWrapper class.
Request Cancellation is supported with Future::cancel() or the
CancelWrapper() Future class.

A proactor design demands that buffers are committed to the kernel
as long as the request is active. To guaranty memory safety Futures
get canceled in their Destructor which will only return after the committed
memory is free to use.

Linking Futures to chains is supported using the Future::SetDependency()
method. Future are submitted when their last Future gets submitted.
A linked Request will start if the previous has finished.
Error or partial completions will cancel the not started tail of a chain.

TODO: Handle possible situations where the CQ of the global completer is full
and no more sqe can be submitted to the SQ.

This feature must be activated using the blocked_context_set meson option.

De-duplicate work-stealing scheduling code

See merge request !69

[tools] Add script to fix the includes with IWYU

Closes #8

See merge request !70

This introduces AbstractWorkStealingScheduler which holds the common
work-stealing scheduling strategy.

Fixes #8.

[test] Add EMPER test runner

See merge request !48

Add option to include timestamp in EMPER log messages

See merge request !68

This also changes emper_log so that a std::ostringstream is used to
assemble the log message.

[tests] Include fiberNum in SimpleActorTest WDBG() log

See merge request !67

[LAWS] Attempt to steal from all other workers instead of just one

Closes #6

See merge request !66

The LAWS strategy, unlike the WS strategy, previously only attempted
to steal from one victim, instead of trying all other workers. This
probably caused SimpleActorTest to sporadically timeout, as all
workers went to sleep.

With this change, LAWS attempts, just like WS, to steal from all other
workers. In a next step, we may want to reduce the duplicated code
resulting from this.

Fixes #6.

[Runtime] Add missing constexpr

See merge request !65