| Portability | Requires GHC with Hpc support. |
|---|---|
| Stability | unstable |
| Maintainer | Thorkil Naur |
Trace.Hpc.Strobe
Description
A rudimentary library that demonstrates the possibility of
using Hpc (Haskell Program Coverage) to inspect the state of
a running Haskell program. Use of the library involves a
simple change of the main function and also requires the
program to be enabled for hpc. At the time of writing, this
means using a fairly recent version of GHC and compiling the
Haskell code with the -fhpc option.
Write strobes (tix files) regularly while program is running
withStrobesWrittenRegularlySource
Arguments
| :: FilePath | Name of directory where .tix files are deposited. If this directory does not exist, no tix files are written. |
| -> String | Prefix of file name for .tix files. |
| -> Int | Microseconds between writing a .tix file. |
| -> IO () | The main function to be strobe'd. |
| -> IO () | The modified main function. |
Replace
main = <your main function>
by
myMain = <your main function>
main = withStrobesWrittenRegularly
"<tixfile directory>"
"myMain"
1000000
myMain
and strobes (separate Hpc tix files) will be written regularly, with 1 second (1000000 microseconds) between each writing of a strobe. The tix files will be deposited in the indicated tixfile directory and be named "myMain_<index>.tix" where the index is taken from [0..].