Hi,
I am using the JNI invocation API in a C (not C++) application. Calling java methods
works. But when the program calls exit() it hangs in __syscall_sigsuspend(). All
threads (native ones, creates by the JVM after JNI_CreateJavaVM()) remain in the
process list. This is the stack of the main thread:
(gdb) bt
#0 0x4017af74 in __syscall_sigsuspend ()
#1 0x4019f4cc in __DTOR_END__ ()
#2 0x4010061d in pthread_exit_process (retcode=0, arg=0x0) at restart.h:32
#3 0x401256aa in exit (status=0) at exit.c:52
#4 ...
I think this in not a problem of my application, as the same effect occurs with
appletviewer:
$ rm -rf $HOME/.hotjava
$ appletviewer & # the licence window appears
# press [accept] button (nothing happens)
# press it again (window disappears)
# appletviewer ends with a usage message
$ ps # lists 9 threads
27370 p8 S 0:00 sh /usr/lib/java/bin/../bin/i686/native_threads/appletviewer
27390 p8 S 0:00 /usr/lib/java/bin/../bin/i686/native_threads/java sun/applet
27391 p8 S 0:00 /usr/lib/java/bin/../bin/i686/native_threads/java sun/applet
27392 p8 S N 0:00 /usr/lib/java/bin/../bin/i686/native_threads/java sun/applet
27393 p8 S 0:00 /usr/lib/java/bin/../bin/i686/native_threads/java sun/applet
27394 p8 S 0:00 /usr/lib/java/bin/../bin/i686/native_threads/java sun/applet
27395 p8 S N 0:00 /usr/lib/java/bin/../bin/i686/native_threads/java sun/applet
27396 p8 S N 0:00 /usr/lib/java/bin/../bin/i686/native_threads/java sun/applet
27397 p8 S 0:00 /usr/lib/java/bin/../bin/i686/native_threads/java sun/applet
27398 p8 S N 0:00 /usr/lib/java/bin/../bin/i686/native_threads/java sun/applet
here are 2 of the stacks, all are similar to each other and
to the stack of my program:
$ gdb /usr/lib/java/bin/../bin/i686/native_threads/java
(gdb) atta 27390
Attaching to program `/usr/lib/java/bin/../bin/i686/native_threads/java', process 27390
Reading symbols from /usr/lib/java/bin/../lib/i686/native_threads/libjava.so...
done.
Reading symbols from /lib/libpthread.so.0...done.
Reading symbols from /lib/libm.so.6...done.
Reading symbols from /lib/libdl.so.2...done.
Reading symbols from /usr/lib/java/bin/../lib/i686/native_threads/libawt.so...
done.
Reading symbols from /usr/X11R6/lib/libXpm.so.4...done.
Reading symbols from /usr/X11R6/lib/libXt.so.6...done.
Reading symbols from /usr/X11R6/lib/libICE.so.6...done.
Reading symbols from /usr/X11R6/lib/libSM.so.6...done.
Reading symbols from /usr/X11R6/lib/libXext.so.6...done.
Reading symbols from /usr/X11R6/lib/libX11.so.6...done.
Reading symbols from /usr/X11R6/lib/libXp.so.6...done.
Reading symbols from /lib/libc.so.6...done.
Reading symbols from /lib/ld-linux.so.2...done.
Reading symbols from /lib/libnss_files.so.1...done.
Reading symbols from /lib/libnss_nis.so.1...done.
Reading symbols from /lib/libnsl.so.1...done.
Reading symbols from /lib/libnss_dns.so.1...done.
Reading symbols from /lib/libresolv.so.2...done.
0x40281f74 in __syscall_sigsuspend ()
(gdb) bt
#0 0x40281f74 in __syscall_sigsuspend ()
#1 0x402a64cc in __DTOR_END__ ()
#2 0x40077bef in pthread_join (thread_id=1025, thread_return=0xbffff4c8)
at restart.h:49
#3 0x4005c598 in java_main ()
at ../../../../src/genunix/java/native_threads/src/threads_md.c:1201
#4 0x8061dc6 in main (argc=2, argv=0xbffff5a4, envp=0xbffff5b0)
at ../../../../src/genunix/java/javai/java.c:23
(gdb) deta
Detaching from program: /usr/lib/java/bin/../bin/i686/native_threads/java proces
s 27390
(gdb) atta 27392
(gdb) bt
#0 0x40281f74 in __syscall_sigsuspend ()
#1 0x402a64cc in __DTOR_END__ ()
#2 0x40077383 in pthread_cond_wait (cond=0x81988bc, mutex=0x8198890)
at restart.h:49
#3 0x4005c656 in condvarWait ()
at ../../../../src/genunix/java/native_threads/src/condvar_md.c:191
#4 0x4005b5c1 in sysMonitorWait ()
at ../../../../src/genunix/java/native_threads/src/monitor_md.c:128
#5 0x4005c1cb in WaitToDie ()
at ../../../../src/genunix/java/native_threads/src/threads_md.c:364
#6 0x40057c17 in thread_java_main ()
at ../../../../src/genunix/java/javai/javai.c:142
#7 0x4005c4d8 in java_start ()
at ../../../../src/genunix/java/native_threads/src/threads_md.c:1200
#8 0x40078106 in pthread_start_thread (arg=0xbf9ffea4) at manager.c:165
I am using DLD Distribution Version 4.17.0.4, blackdown jdk1.1.7v3,
THREADS_FLAG=native, libc-2.0.7.so, ld-2.0.7.so, libpthread-0.7.so
There is a warning from ldconfig -D: /lib/libpthread-0.7.so has inconsistent soname
(libpthread.so.0), I don't know, if this can be ignored.
Can anybody help me ?
Regards
Volker
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