NonStop Server for Java 6.0 Programmer's Reference

Click on the specific signal to obtain information about how to install signal handlers for the corresponding signals.

SIGWINCH

HeapDumpOnly feature uses SIGWINCH signal. Hence, the application installs signal handler

for this signal, provided HeapDumpOnly option is not enabled.

HeapDumpOnly option is either enabled by using XX:+HeapDumpOnly Java command line

option or by setting 1 for the environment variable (_JAVA_HEAPDUMP_ONLY).

NOTE: By default, HeapDumpOnly option is false, hence, the application can install signal

handler if it does not explicitly enable HeapDumpOnly option.

SIGALRM

Zero preparation verbose garbage collection feature uses SIGALRM signal. By default,

ZeroPrepVerboseGC is enabled.

ZeroPrepVerboseGC must be disabled to use SIGALARM for other purposes.

SIGUSR2

Zero preparation profiling feature (HP specific feature) uses this signal. The profiling can be enabled

or disabled for the entire runtime of the application or for a selected duration. The details are as

follows:

• If —Xeprof::off is specified in the Java command line, the zero preparation profiling feature

is disabled for the entire duration for which the application runs, and hence the application

can install signal handler for SIGUSR2 signal.

• If —Xeprof is specified in the Java command line, the zero preparation profiling feature is

enabled for the entire duration for which the application runs, and hence the application

cannot install signal handler for SIGUSR2 signal.

• An alternate signal for zero preparation profiling feature can be specified by using:

Xeprof:time_on=<SIGUSR1|SIGUSR>,time_slice=<SIGUSR1|SIGUSR2>.

If SIGUSR2 is not specified as the signal for zero profiling feature, then application can install

signal handler for SIGUSR2.

SIGHUP

JVM uses this signal to support shut down hook if —Xrs is not specified in the command line option

(reduce signal usage). If –Xrs is specified in the command line option, the application can install

signal handlers for SIGHUP signal.

SIGINT

JVM uses this signal to support shut down hook if —Xrs is not specified in the command line option

(reduce signal usage). If –Xrs is specified in the command line option, the application can install

signal handlers for SIGINT signal.

SIGTERM

JVM uses this signal to support shut down hook if —Xrs is not specified in the command line option

(reduce signal usage). If –Xrs is specified in the command line option, the application can install

signal handlers for SIGTERM signal.

Change in Loading of .hotspot_compiler and .hotspotrc files

From NSJ 6.0 SPR — T2766H60^ACH and later versions, the default implicit loading of the

.hotspot_compiler and .hotspotrc files from the current working directory is changed.

70 Implementation Specifics