memory address leak when running many threads which will parsing xml files
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Key: XERCESC-1901
URL: https://issues.apache.org/jira/browse/XERCESC-1901
Project: Xerces-C++
Issue Type: Bug
Components: SAX/SAX2
Affects Versions: 3.0.1
Environment: Red Hat Enterprise Linux Server release 5.1 (Tikanga)
-g++ --version : x86_64-redhat-linux-g++ (GCC) 4.1.1 20070105 (Red Hat
4.1.1-52)
Reporter: tao xiaochuan
when running 5 threads , in each thread a xml file will (for test purpost
xerces-c-3.0.1\samples\data\long.xml is used)
be parsed, it is found, by top command , VIRT increase large , by pmap command
, 3 (some time 4) memory address block about 64 m
are found , when by 8 threads , there will be 5 (some time 6) such blocks :
Address Kbytes Mode Offset Device Mapping
00002aaab00b9000 64796 ----- 00002aaab00b9000 000:00000 [ anon ]
...
00002aaab40b9000 64796 ----- 00002aaab40b9000 000:00000 [ anon ]
...
00002aaab80bb000 64788 ----- 00002aaab80bb000 000:00000 [ anon ]
these blocks will not be released even after XMLPlatformUtils::Terminate();
if there is only one thead , there is no such a problem
chief code structure:
main(){
XMLPlatformUtils::Initialize();
//start many threads
//wait for alll threads ends
XMLPlatformUtils::Terminate();
}
in each thread :
while(true){
...
auto_ptr<SAXParser> parser( new SAXParser() );
parser->setDocumentHandler(this); //the handler do nothing but just
extend from HandlerBase
parser->setErrorHandler(this); //the handler do nothing but just
extend from HandlerBase
parser->setValidationScheme(SAXParser::Val_Never);
parser->setDoSchema(false);
parser->setDoNamespaces(true);
parser->parse(inputFile.c_str());
}
refer to attachment for detail about the simple test code
one more related question :
in the doc , it is said "client application needs to Terminate() (or multiple
Terminate() in the case where multiple Initialize() have been invoked before" ,
does it also suit for more than one threads ?
for example :
thread 1 : XMLPlatformUtils::Initialize(); //A
thread 1 : do some parsing //B
thread 2 : XMLPlatformUtils::Initialize(); //C
thread 2 : do some parsing //D
thread 1 : do some parsing //E
thread 1 : XMLPlatformUtils::Terminate(); //F
thread 2 : do some parsing //G
thread 1 : XMLPlatformUtils::Terminate(); //H
}
since these two api are all static , then does C will affect E and does F
affect G
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