RE: valgrind and CNI

["Boehm, Hans" <hans dot boehm at hp dot com>]

I don't know about the hanging problem.  The error messages about the
GC are well understood and expected.  See also

http://article.gmane.org/gmane.comp.programming.garbage-collection.boehm
gc/733

Hans

> -----Original Message-----
> From: java-owner@gcc.gnu.org [mailto:java-owner@gcc.gnu.org] 
> On Behalf Of David Blasby
> Sent: Sunday, February 13, 2005 10:03 AM
> To: java@gcc.gnu.org
> Subject: valgrind and CNI
> 
> 
> I wrote a C++ wrapper (using CNI) around a Java library, and 
> a "C" program that calls the C++ wrapper.  It appears to work 
> fine, but when I try to valgrind it, valgrind complains a bit 
> then hangs (at 100%) cpu.
> 
> I simplified my program so that I have a simple C++ program 
> that calls the Java library (using CNI).  When I valgrind, I 
> find that it does the same thing - spits out a few errors then hangs.
> 
> Is this a known problem or is there something wrong with my program?
> 
> [dblasby@localhost ~/jts_compile]$ valgrind --tool=memcheck 
> a.out ==3571== Memcheck, a memory error detector for 
> x86-linux. ==3571== Copyright (C) 2002-2004, and GNU GPL'd, 
> by Julian Seward et al. ==3571== Using valgrind-2.2.0, a 
> program supervision framework for x86-linux. ==3571== 
> Copyright (C) 2000-2004, and GNU GPL'd, by Julian Seward et 
> al. ==3571== For more details, rerun with: -v ==3571== 
> ==3571== Conditional jump or move depends on uninitialised value(s)
> ==3571==    at 0x6C6E916: GC_push_all_eager (in 
> /usr/lib/libgcj.so.5.0.0)
> ==3571==    by 0x6C6FD0B: GC_push_current_stack (in 
> /usr/lib/libgcj.so.5.0.0)
> ==3571==    by 0x6C75F86: GC_generic_push_regs (in 
> /usr/lib/libgcj.so.5.0.0)
> ==3571==    by 0x6C6FE17: GC_push_roots (in /usr/lib/libgcj.so.5.0.0)
> ==3571==
> ==3571== Conditional jump or move depends on uninitialised value(s)
> ==3571==    at 0x6C6E916: GC_push_all_eager (in 
> /usr/lib/libgcj.so.5.0.0)
> ==3571==    by 0x6C6E975: GC_push_all_stack (in 
> /usr/lib/libgcj.so.5.0.0)
> ==3571==    by 0x6C75A32: GC_push_all_stacks (in 
> /usr/lib/libgcj.so.5.0.0)
> ==3571==    by 0x6C71B0B: GC_default_push_other_roots (in
> /usr/lib/libgcj.so.5.0.0)
> ==3571==
> ==3571== Syscall param sigaction(act) contains uninitialised 
> or unaddressable byte(s)
> ==3571==    at 0x735A77: syscall (in /lib/tls/libc-2.3.3.so)
> ==3571==  Address 0x52BFE730 is on thread 1's stack
> ==3571== Conditional jump or move depends on uninitialised value(s)
> ==3571==    at 0x6C751ED: GC_pthread_create (in 
> /usr/lib/libgcj.so.5.0.0)
> ==3571==    by 0x6AAEB55: _Jv_ThreadStart(java::lang::Thread*,
> _Jv_Thread_t*, void (*)(java::lang::Thread*)) (in
> /usr/lib/libgcj.so.5.0.0)
> ==3571==    by 0x6ADA438: java::lang::Thread::start() (in
> /usr/lib/libgcj.so.5.0.0)
> ==3571==    by 0x6AB0858: _Jv_CreateJavaVM(void*) (in 
> /usr/lib/libgcj.so.5.0.0)
> ==3571==
> ==3571== Thread 2:
> ==3571== Conditional jump or move depends on uninitialised value(s)
> ==3571==    at 0x1BA5C765: thread_wrapper (vg_libpthread.c:836)
> ==3571==    by 0xB000F14F: do__quit (vg_scheduler.c:1872)
> ==3571==
> ==3571== Thread 2:
> ==3571== thread_wrapper: invalid attr->__detachstate
> ==3571==    at 0x1BA5B8A0: pthread_error (vg_libpthread.c:380)
> ==3571==    by 0x1BA5C772: thread_wrapper (vg_libpthread.c:838)
> ==3571==    by 0xB000F14F: do__quit (vg_scheduler.c:1872)
> ==3571==
> ==3571== Thread 2:
> ==3571== Conditional jump or move depends on uninitialised value(s)
> ==3571==    at 0x1BA5C779: thread_wrapper (vg_libpthread.c:839)
> ==3571==    by 0xB000F14F: do__quit (vg_scheduler.c:1872)
> 
> (hangs)
> 
> Here's the C++ program:
> 
> #pragma GCC java_exceptions
> 
> #include "Geometry.h"
> #include "StaticGeometry.h"
> #include <java/lang/Integer.h>
> #include <java/lang/Math.h>
> #include <gcj/cni.h>
> #include <stdio.h>
> #include <java/lang/System.h>
> #include <java/lang/String.h>
> #include <java/io/PrintStream.h>
> #include <java/lang/Throwable.h>
> 
> int main(int argc, char** argv)
> {
>   //  using namespace java::lang::String;
>     using namespace java::lang;
>     using namespace com::vividsolutions::jts::geom;
>     using namespace test;
>    
> 
> 
> 	 JvCreateJavaVM(NULL);
>          JvAttachCurrentThread(NULL, NULL);	
> 
> 	JvInitClass(&java::lang::System::class$);
>         JvInitClass(&Geometry::class$);
>         JvInitClass(&StaticGeometry::class$);
> 	JvInitClass(&System::class$);
>         JvInitClass(&String::class$);
> 
> 
> 	char *wkt1 = "LINESTRING(-10 -10,20 20)";
>    
>         jstring wkt_j  = JvNewStringLatin1 (wkt1); 
> printf("about to call java function geomFromWKT\n");
> 	Geometry *g1   =StaticGeometry::geomFromWKT(wkt_j);
> printf("about to call java function getLength\n");
>         jdouble len1   = StaticGeometry::getLength(g1);
> 
>         printf("len1 = %g\n", (double) len1);
> }
> // gcjh Geometry
> //
> // gcj -g -shared -o libjts.so jts-1.5.jar
> // gcj -classpath jts-1.5.jar -shared -o libstaticgeom.so 
> StaticGeometry.class
> 
> //g++ -g t.cc -lgcj -ljts -lstaticgeom -L.
> // /sbin/ldconfig ~dblasby/helloworld/
> 
> Thanks,
> 
> dave
>