>>>>> Vasile GABURICI writes:
Vasile> Dear Blackdown developers,
Vasile> I know that your time is precious, so I have only two
Vasile> questions regarding the interaction between a C
Vasile> application using Linux kernel threads and your JDK
Vasile> 1.2.2-RC4:
Vasile> 1) What *exactly* is permitted and what is not with respect to
Vasile> threads and signal masks? If handler is installed for
Vasile> signal like SIGHUP in the main thread, why do threads
Vasile> that block this signal hang at random points inside the
Vasile> JVM?
We don't use SIGHUP. Your problem is that you are blocking our
suspend signal.
Vasile> 2) How does the -Xrs flag "reduce the use of OS signals"? Can you
Vasile> give me a list of signals that are used by your JVM
Vasile> with and without this flag?
The native threads implemenation uses SIGRTMIN + 3 and SIGRTMIN + 4
and SIGPIPE.
The JVM also installs panic handlers for some signals and a SIGQUIT
handler. If you specify '-Xrs', the JVM only installs panic handlers
for SIGFPE, SIGSEGV and SIGILL.
(The LinuxThreads library uses SIGRTMIN, SIGRTMIN + 1, and SIGRTMIN + 2.)
Juergen
--
Juergen Kreileder, Blackdown Java-Linux Team
http://www.blackdown.org/java-linux.html
JVM'01: http://www.usenix.org/events/jvm01/
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