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[netCDF #BSC-631634]: Multi threading support in NetCDF4 C lib

Subject: [netCDF #BSC-631634]: Multi threading support in NetCDF4 C lib
Date: Tue, 01 Aug 2017 10:12:48 -0600

Hello,

netCDF is not thread safe; two different threads cannot write to two separate 
files, as there is global file information which would be overwritten when the 
second file was opened.

I'm sorry I can't provide a positive response, but hopefully this information 
is useful,

-Ward

> Hello,
> 
> I have compiled the netcdf dll files by downloading netcdf-c-4.4.1-rc2.7z and 
> other required tools like CMake, curl, HDF5, etc...
> 
> I see that the system crash when two threads try to access the different 
> netcdf files.
> Is the netcdf lib thread safe?
> Can two different thread write to two separate files?
> 
> However if I just continue to write from one thread it works just fine!!
> 
> ================  following is the stack of core dump 
> =============================
> 
> ExceptionCode:    c0000005
> ExceptionAddress: 025e5e8d
> ExceptionFlags:   00000000
> ExceptionInfo[0]: 00000000
> ExceptionInfo[1]: 0000000c
> 
> Snapshot for thread 6716.
> 
> EAX:    00000000
> EBX:    0854a118
> ECX:    00000000
> EDX:    00000001
> EDI:    00000003
> ESI:    08cd7b00
> EIP:    025e5e8d
> ESP:    001bbfb8
> EBP:    001bbfdc
> EFLAGS: 00010203
> 
> 01:EIP/ESP/EBP: 025e5e8d/001bbfb8/001bbfdc
> --:Symbol:      NCD2_open+414541
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+745101
> 02:EIP/ESP/EBP: 025e7ab7/001bbfe4/001bbff4
> --:Symbol:      NCD2_open+421751
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+752311
> 03:EIP/ESP/EBP: 0267faf0/001bbffc/001bc028
> --:Symbol:      NCD2_open+1044400
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+1374960
> 04:EIP/ESP/EBP: 025bf000/001bc030/001bc060
> --:Symbol:      NCD2_open+255168
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+585728
> 05:EIP/ESP/EBP: 0268ba2f/001bc068/001bc0e4
> --:Symbol:      NCD2_open+1093359
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+1423919
> 06:EIP/ESP/EBP: 0268bcb2/001bc0ec/001bcd8c
> --:Symbol:      NCD2_open+1094002
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+1424562
> 07:EIP/ESP/EBP: 026ae059/001bcd94/001bcdb0
> --:Symbol:      NCD2_open+1234201
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+1564761
> 08:EIP/ESP/EBP: 02655ef5/001bcdb8/001bce6c
> --:Symbol:      NCD2_open+873397
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+1203957
> 09:EIP/ESP/EBP: 025d2fce/001bce74/001bce8c
> --:Symbol:      NCD2_open+337038
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+667598
> 10:EIP/ESP/EBP: 025d308c/001bce94/001bcea0
> --:Symbol:      NCD2_open+337228
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+667788
> 11:EIP/ESP/EBP: 0258a475/001bcea8/001bceb8
> --:Symbol:      NCD2_open+39221
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+369781
> 12:EIP/ESP/EBP: 025ef3e5/001bcec0/001bced8
> --:Symbol:      NCD2_open+452773
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+783333
> 13:EIP/ESP/EBP: 0258a518/001bcee0/001bcefc
> --:Symbol:      NCD2_open+39384
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+369944
> 14:EIP/ESP/EBP: 025d46e0/001bcf04/001bcf20
> --:Symbol:      NCD2_open+342944
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+673504
> 15:EIP/ESP/EBP: 025d9d0a/001bcf28/001bcf44
> --:Symbol:      NCD2_open+365002
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+695562
> 16:EIP/ESP/EBP: 025db9d3/001bcf4c/001bcf64
> --:Symbol:      NCD2_open+372371
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+702931
> 17:EIP/ESP/EBP: 025dbadb/001bcf6c/001bcf78
> --:Symbol:      NCD2_open+372635
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+703195
> 18:EIP/ESP/EBP: 025899f4/001bcf80/001bcf94
> --:Symbol:      NCD2_open+36532
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+367092
> 19:EIP/ESP/EBP: 02560e94/001bcf9c/001bcfa8
> --:Symbol:      NC4_redef+212
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+200340
> 20:EIP/ESP/EBP: 02561718/001bcfb0/001bcfbc
> --:Symbol:      NC4_sync+88
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+202520
> 21:EIP/ESP/EBP: 02532565/001bcfc4/001bcfd0
> --:Symbol:      nc_sync+37
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\libnetcdf\dll\netcdf.dll+9573
> 22:EIP/ESP/EBP: 01343c4c/001bcfd8/001bcfdc
> --:Symbol:      NetCDFAPI::ncSync+12
> --:Line:        
> c:\vaisala\blviewsrc\library\netcdfinterfacelib\netcdfapi.cpp:108+9
> --:Module:      
> C:\Vaisala\BLViewSrc\arch\i686-win32-vc100\build\Debug\netcdf_srv.exe+277580
> 
> 
> 
> Thanks
> Suresh Panara
> 
> 


Ticket Details
===================
Ticket ID: BSC-631634
Department: Support netCDF
Priority: Normal
Status: Closed
===================
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