On 11-08-07 8:09 PM, Alexandre Aguiar wrote:
Hi.
Need some advice. I have to load a library during R_init_XXXXX() with
dlopen(). The library file is 23 megabytes long and loads several other
libraries. Everything happens during dlopen() execution, out of control,
and takes around 1 second on first load in a quadcore. Besides, due to
security reasons, a hash of the library file is going to be computed.
Still do not know how long it will take.
Questions.
Is 1 second acceptable for R? Slower machines may take a lot longer to
return from R_init_XXXXX(). Does R_init_XXXXX() have to return soon or
call R_CheckUserInterrupt()? Or is it somehow free from this R need?
R won't care if interrupts aren't called. It will be unresponsive
during that time, so your users might not like it, but presumably
they'll know what to expect.
Is it safe to load the second library and compute the hash within other
threads so R_init_XXXXX goes on? If some function of my extension library
is called it can call R_CheckUserInterrupt() if and while the threads do
not end. If such use of threads is safe inside R, is there a package that
does it? Any tips?
R is not thread safe, so your other threads have to avoid any calls to R.
Flags currently sent to dlopen are (RTLD_LAZY | RTLD_LOCAL). Revolving the
R sources could not find the flags R uses. Does any of you know for sure
the flags used to load extensions with loadLibrary()? Looking into
computeDLOpenFlag() did not answer the question. Is there a recommended
flags set in this situation?
You don't say what OS you're working on.
Duncan Murdoch
Aparently dlopen() flags LM_ID_BASE and RTLD_GROUP (their use sounds wise)
are not defined in Linux. Is this correct or I missed something?
Thanks.
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