Re: Sleep in a cycle
My schoolboy mistake. Thank you, [Adam](https://forum.dlang.org/post/mbbampewwcrkkltjl...@forum.dlang.org)! On Saturday, 21 May 2022 at 11:17:04 UTC, Alain De Vos wrote: Or you could capture a sigint and close the file then. Yes, exactly, I was thinking in this direction. Probably not quite correctly implemented in practice.
Re: Sleep in a cycle
Or you could capture a sigint and close the file then.
Re: Sleep in a cycle
On 5/20/22 07:59, Alexander Zhirov wrote:
> I have a loop spinning, I want to pause in it in order to repeat the
> next iteration. An error is displayed during compilation.
>
> ```d
> while (true)
> {
We are in an unconditional loop which is also infinite.
> }
But you have code after the loop:
> file.close();
>
> return 0;
> }
>
> ```
> source/app.d(32,5): Warning: statement is not reachable
That is warning you that your code cannot be executed. One option:
1) Change main's return type to 'void' and remove 'return 0'. (The
program will automatically return 0 to its starter upon successful
completion and non-zero upon an uncaught exception.)
2) Remove file.close(), which is not needed because File is an RAII
type; its objects close their handles in their destructors automatically.
However, since your code never gets to that point, you may have
unflushed data when you terminate the program. I think it depends on
your file system whether '\n' which is implied at ends of writeln is a
flush trigger.
3) Regardless, I would add file.flush() after the last writeln in the loop.
> Is there any way to pause to slow down the cycle?
That is correct. There is a more pleasant syntax that takes advantage of
D's UFCS:
Thread.sleep(10.seconds);
Ali
Re: Sleep in a cycle
On Friday, 20 May 2022 at 14:59:07 UTC, Alexander Zhirov wrote: I have a loop spinning, I want to pause in it in order to repeat the next iteration. An error is displayed during compilation. The error has nothing to do with the sleep source/app.d(32,5): Warning: statement is not reachable Error: warnings are treated as errors Use -wi if you wish to treat warnings only as informational. this is saying the stuff after your `while(true)` is never reached because it is an infinite loop.
Sleep in a cycle
I have a loop spinning, I want to pause in it in order to repeat
the next iteration. An error is displayed during compilation.
```d
import std.stdio;
import modules.monitors; //my module
import core.thread;
int main(string[] args)
{
string path = "mswitch.log";
if (args.length > 1)
{
path = args[1];
}
auto file = File(path, "w");
auto monitors = getMonitorsInfo();
file.writeln(monitors);
while (true)
{
setPrimaryMonitor(monitors[1].name);
file.writeln("-- Switch monitors --");
swapMonitors(monitors[0].name, monitors[1].name,
Relation.right_of);
monitors = getMonitorsInfo();
file.writeln(monitors);
Thread.sleep(dur!("seconds")(10));
}
file.close();
return 0;
}
```
Result build:
```sh
$ dub
Performing "debug" build using /usr/bin/ldc2 for x86_64.
mswitch ~master: building configuration "application"...
Running pre-build commands...
source/app.d(32,5): Warning: statement is not reachable
source/app.d(34,5): Warning: statement is not reachable
source/app.d(32,5): Warning: statement is not reachable
source/app.d(34,5): Warning: statement is not reachable
Error: warnings are treated as errors
Use -wi if you wish to treat warnings only as
informational.
/usr/bin/ldc2 failed with exit code 1.
```
Is there any way to pause to slow down the cycle?
