Possible bug, Rprof() and scan(pipe()) (PR#1140)

This does not happen on Solaris or Linux, so must be related to the use of
signals on darwin.

It probably means Rprof should be avoided on that platform, but the
porter (Jan de Leeuw) needs to investigate.


On Tue, 23 Oct 2001 macq@llnl.gov wrote:

 This looks like a bug?
 Unable to use scan(pipe()) while profiling.
 I have no idea whether this version of R violates the
     "do not use `Rprof' in an executable built for profiling"
 warning in ?Rprof.

 Thanks
 -Don

 >  version

           _
 platform powerpc-apple-darwin1.4
 arch     powerpc
 os       darwin1.4
 system   powerpc, darwin1.4
 status   Patched
 major    1
 minor    3.1
 year     2001
 month    10
 day      15
 language R

 >
 > >  foo <- scan(pipe('ls -1 | head -3'),what='')

 Read 3 items

 >  foo

 [1] "README"      "RMfiles.dat" "RMfiles.tmp"

 >  Rprof()
 >  foo <- scan(pipe('ls -1 | head -3'),what='')

 Read 0 items

 >  foo

 character(0)

 >  Rprof(NULL)
 > >  foo <- scan(pipe('ls -1 | head -3'),what='')

 Read 3 items

 >

 note, profiling does appear to be functional:

 >  Rprof() ; hist(rnorm(10000)) ; Rprof(NULL)
 >  system('R CMD Rprof Rprof.out')

 >
 Each sample represents 0.02 seconds.
 Total run time: 0.1 seconds.

 Total seconds: time spent in function and callees.
 Self seconds: time spent in function alone.

     %       total       %       self
   total    seconds     self    seconds    name
 100.00      0.10      0.00      0.00     "hist"
   60.00      0.06      0.00      0.00     "hist.default"
   40.00      0.04     40.00      0.04     "rnorm"
   40.00      0.04      0.00      0.00     "plot"
   40.00      0.04      0.00      0.00     "plot.histogram"
   20.00      0.02      0.00      0.00     "storage.mode<-"
   20.00      0.02     20.00      0.02     "X11"
   20.00      0.02      0.00      0.00     "paste"
   20.00      0.02      0.00      0.00     "rect"
   20.00      0.02      0.00      0.00     "plot.new"
   20.00      0.02     20.00      0.02     "seq.default"
   20.00      0.02      0.00      0.00     "seq"
   20.00      0.02     20.00      0.02     "par"

     %       self        %       total
   self     seconds    total    seconds    name
   40.00      0.04     40.00      0.04     "rnorm"
   20.00      0.02     20.00      0.02     "X11"
   20.00      0.02     20.00      0.02     "seq.default"
   20.00      0.02     20.00      0.02     "par"

 --
 --------------------------------------
 Don MacQueen
 Environmental Protection Department
 Lawrence Livermore National Laboratory
 Livermore, CA, USA
 --------------------------------------


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--
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
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