Hello Miguel,
> c: serial_close(handle=0x7fe044008d80) close(fd) elapsed=21,530000
The time is from when the function entered (using the clock() function)
and the end.
There seems to be about 6900ms between calling the P/Invoke method and
when the function actually gets called. You'll see a second call later
works as expected (the C method takes 0,066000ms and the .NET says 0ms
using).
On 23/04/2016 17:15, Miguel de Icaza wrote:
Time the C calls, it is possible that close is flushing the data and
is not returning until that happebs
On Sat, Apr 23, 2016 at 9:33 AM Jason Curl <jcurln...@arcor.de
<mailto:jcurln...@arcor.de>> wrote:
I've tested the latest snapshot of Mono and the problem remains:
Mono JIT compiler version 4.5.0 (Nightly 4.5.0.421/c5789eb Thu Mar 24
18:42:59 UTC 2016)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors.
www.mono-project.com <http://www.mono-project.com>
TLS: __thread
SIGSEGV: altstack
Notifications: epoll
Architecture: amd64
Disabled: none
Misc: softdebug
LLVM: supported, not enabled.
GC: sgen
nUnit-gui now works properly (4.2.3.4 would hang when trying to close)
and using MONO debug variables (MONO_LOG_MASK="dll";
MONO_LOG_LEVEL="debug", I can see that the method "serial_close" is
called at the correct time, but I don't see any other activity while
blocked.
Mono: DllImport searching in: 'nserial' ('libnserial.so').
Mono: Searching for 'serial_close'.
Mono: Probing 'serial_close'.
Mono: Found as 'serial_close'.
PAUSE FOR 6 SECONDS
Mono: DllImport searching in: 'nserial' ('libnserial.so').
Mono: Searching for 'serial_read'.
Mono: Probing 'serial_read'.
Mono: Found as 'serial_read'.
Mono: DllImport searching in: 'nserial' ('libnserial.so').
Mono: Searching for 'serial_terminate'.
Mono: Probing 'serial_terminate'.
Mono: Found as 'serial_terminate'.
Any help is appreciated.
On 22.04.2016 23:37, Jason Curl wrote:
> I've generally got my library working
> (github.com/jcurl/serialportstream
<http://github.com/jcurl/serialportstream>) on Linux with Mono
4.2.3.4 from
> the Xamarin repositories on Ubuntu 16.04, with one small problem.
>
> One new test case (ClosedWhenBlocked) takes 6923ms for a simple
> close() function using marshalling, where the function in C only
needs
> 22ms. It's called twice (there's two instances), the second is
> effectively instantaneous. On my machine, the issue is 100%
> reproducible. My C code and .NET is OK (as far as I can tell) and
> appears to be some blocking behaviour in the Marshalling code of the
> .NET framework. How can I debug further if it's me or .NET?
>
> Note, I can't compare on Windows as it's Linux specific code.
>
>
> Closing serialSource
> ...
> --> serial_close(140601190288768) => 0x7FE044008D80
> ...
> --> serial_close(140601190288768) took 6916 ms
> IO.Ports.SerialPortStream Verbose: 0 : -->
> serial_close(140601190288768) took 6916 ms
> ...
> Closed serialSource after 6923 ms
> ...
> --> serial_close(140601190278688) => 0x7FE044006620
> --> serial_close(140601190278688) took 0 ms
> --> serial_close(140601190278688) took 0 ms
>
>
>
> The code in question is
> [DllImport("nserial", EntryPoint="serial_close",
> SetLastError=true)]
> private static extern int nserial_close(IntPtr handle);
> public int serial_close(IntPtr handle)
> {
> System.Diagnostics.Stopwatch sw = new
> System.Diagnostics.Stopwatch();
> sw.Start();
> Console.WriteLine("--> serial_close({0})", handle);
> int result = nserial_close(handle);
> Console.WriteLine("--> serial_close({0}) took {1} ms",
> handle, sw.ElapsedMilliseconds);
> errno = Marshal.GetLastWin32Error();
> Console.WriteLine("--> serial_close({0}) took {1} ms",
> handle, sw.ElapsedMilliseconds);
> return result;
> }
>
> I added diagnostics to my C code to write performance data to
disk and
> it is:
> c: serial_close(handle=0x7fe044008d80)
> c: serial_close(handle=0x7fe044008d80) fd=4
> c: serial_close(handle=0x7fe044008d80) flushbuffer elapsed=0,005000
> c: serial_close(handle=0x7fe044008d80) close(prfd) elapsed=0,028000
> c: serial_close(handle=0x7fe044008d80) close(pwfd) elapsed=0,046000
> c: serial_close(handle=0x7fe044008d80) close(fd) elapsed=21,530000
> c: serial_close(handle=0x7fe044006620)
> c: serial_close(handle=0x7fe044006620) fd=14
> c: serial_close(handle=0x7fe044006620) flushbuffer elapsed=0,004000
> c: serial_close(handle=0x7fe044006620) close(prfd) elapsed=0,048000
> c: serial_close(handle=0x7fe044006620) close(pwfd) elapsed=0,062000
> c: serial_close(handle=0x7fe044006620) close(fd) elapsed=0,066000
>
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