[AGENT++] Segmentation fault when trying to use no threads

[Frank Fock]

Hi James,

If you use _NO_THREADS you have to recompile *everything*. All libs
and the executable. The stack trace below seems to be caused by 
inconsistent
object libraries (some with _NO_THREADS others without).

Hope this helps.

Best regards,
Frank

JAMES Robin wrote:

>We have tried to use the no threads mode in snmp++ and agent++. To do this we uncommented the defining of _NO_THREADS in agent++.h and config_snmp_pp.h and re-compiled everything. When the subagent runs it causes a segmentation fault. The back trace is:
> 
>#0  0x00263b2a in _int_malloc () from /lib/tls/libc.so.6
>#1  0x00262e7d in malloc () from /lib/tls/libc.so.6
>#2  0x0019f40e in operator new () from /usr/lib/libstdc++.so.5
>#3  0x0019f55f in operator new[] () from /usr/lib/libstdc++.so.5
>#4  0x007cfccf in Oid (this=0x88bd984, oid=@0xbfff81f0 <mailto:oid=@0xbfff81f0> ) at oid.cpp:136
>#5  0x006929db in Oidx (this=0x88bd984, _ctor_arg=@0xbfff81f0 <mailto:_ctor_arg=@0xbfff81f0> ) at mib_entry.h:202
>#6  0x00699026 in MibEntry (this=0x88bd938, o=@0xbfff81f0 <mailto:o=@0xbfff81f0> , a=NOACCESS) at mib_entry.cpp:128
>#7  0x006d5b08 in MibGroup (this=0x88bd938, o=@0xbfff81f0 <mailto:o=@0xbfff81f0> , p=@0xbfff8210 <mailto:p=@0xbfff8210> ) at mib_context.cpp:110
>#8  0x0805ed10 in graphics_mib (this=0x88bd938) at graphics_mib_agent.C:817
>#9  0x080539d5 in main (argc=2, argv=0xbfff8314) at gphs_mib.C:104
>
> 
>The code is failing at line 817 in the following code extract:
> 
>814 // Group
>815 graphics_mib::graphics_mib():
>816    MibGroup("1.3.6.1.4.1.1254.1.1.11", "graphics_mib")
>817 {
>818  //--AgentGen BEGIN=graphics_mib::graphics_mib
>819  //--AgentGen END
>820  add(new graphics_mib_gphAttributeChangeCount());
>821  add(new graphics_mib_gphServerType());
>822  add(new graphics_mib_gphServerState());
>823  add(new graphics_mib_gphGraphicsState());
>824  add(new graphics_mib_gphPointerState());
>825  add(new graphics_mib_gphKeyboardState());
>826  add(new graphics_mib_decGraphicsCardType());
>827  add(new graphics_mib_decPointerType());
>828  add(new graphics_mib_decKeyboardType());
>829  add(new graphics_mib_sonyDdmMajorSystemState());
>830  add(new graphics_mib_sonyDdmM1BoardState());
>831  add(new graphics_mib_sonyDdmDacState());
>832  add(new graphics_mib_sonyDdmDfgState());
>833  //--AgentGen BEGIN=graphics_mib::graphics_mib:post
>834  //--AgentGen END
>835 }
>
> 
>We also tried to use the no threads mode by defining _NO_THREADS in Makefile.linux but then had undefined references when linking the subagent:
> 
>gphs_mib.o: In function `Agentpp::Thread::clone()':
>agent++/include/agent_pp/List.h:282: undefined reference to `Agentpp::Thread::get_runnable()'
>gphs_mib.o:agent++/include/agent_pp/List.h:169: undefined reference to `Agentpp::Thread::Thread(Agentpp::Runnable&)'
>gphs_mib.o: In function `Agentpp::TaskManager::clone()':
>agent++/include/agent_pp/List.h:1077: undefined reference to `Agentpp::ThreadPool::ThreadPool(int, int)'
>gphs_mib.o:agent++/include/agent_pp/List.h:485: undefined reference to `Agentpp::TaskManager::TaskManager(Agentpp::ThreadPool*, int)'
>
> 
>When compiled without defining _NO_THREADS the program works. What settings should be we be using to remove thread support?
> 
>Regards
>Robin James
> 
>
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