Interesting... I am using H5Fclose(). If 2 different threads call this function for the same file (but different file handles), does HDF handle this?
On Mon, Aug 29, 2016 at 11:29 AM, Dana Robinson <[email protected]> wrote: > Hi Isaac, > > > > It sounds like you want to call H5Fclose, not H5close. Try just closing > the file and not calling H5close at all. Does that work? > > > > Dana > > > > *From:* Hdf-forum [mailto:[email protected]] *On > Behalf Of *Isaac Gerg > *Sent:* Monday, August 29, 2016 11:25 AM > *To:* HDF Users Discussion List <[email protected]> > *Subject:* Re: [Hdf-forum] HDF5 -- multithreading support or not? > > > > Hi Dana, > > > > I am not sure I understand your question. In each thread, I open an hdf > file, read from it, and then call H5close(). > > > > > Normally, you don't need to call H5close() explicitly, btw. It will be > called when the program exits. > > > > I did not know about this. > > > > In reading the documentation... > > > > > "This function is generally called when the application calls exit(), > but may be called earlier in the event of an emergency shutdown or out of a > desire to free all resources used by the HDF5 library." > > To me, "generally" implies that h5close() is not guaranteed to be called > in exit() OR that its preferred by hdf library that the user calls > H5close() right before calling exit(). > > > > Thank you, > > Isaac > > > > On Mon, Aug 29, 2016 at 11:14 AM, Dana Robinson <[email protected]> > wrote: > > Hi Isaac, > > > > Are you calling H5close() from one thread and then expecting the other > thread to make HDF5 calls? Because HDF5 calls are unlikely to be successful > after you shut the library down :) > > > > Normally, you don't need to call H5close() explicitly, btw. It will be > called when the program exits. > > > > From the reference manual (https://www.hdfgroup.org/ > HDF5/doc/RM/RM_H5.html#Library-Close ): > > > > "This function is generally called when the application calls exit(), but > may be called earlier in the event of an emergency shutdown or out of a > desire to free all resources used by the HDF5 library." > > > > Dana Robinson > > Software Engineer > > The HDF Group > > > > *From:* Hdf-forum [mailto:[email protected]] *On > Behalf Of *Isaac Gerg > *Sent:* Friday, August 26, 2016 6:31 PM > *To:* [email protected] > *Subject:* [Hdf-forum] HDF5 -- multithreading support or not? > > > > Hi Folks, > > > > I am a need for a windows application to have two threads read the same > hdf5 file as read-only. I have searched over months on the internet trying > to determine if HDF5 can surely handle this case and have found conflicting > results. > > > > I have built a test in C++, using the hdf5 C API, to determine if the read > is possible. The test occasional segfaults on H5Close(). I am trying to > determine if the segfault is due to HDF5 or my own error. > > > > TL;DR - can HDF5 on windows support having 2 threads read from the same > file as online documentation seems to be inconsistent. > > > > Thanks in advance, > > Isaac > > > _______________________________________________ > Hdf-forum is for HDF software users discussion. > [email protected] > http://lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org > Twitter: https://twitter.com/hdf5 > > > > _______________________________________________ > Hdf-forum is for HDF software users discussion. > [email protected] > http://lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org > Twitter: https://twitter.com/hdf5 >
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