What is Signal Chaining mechanism that has been implemented in JDK 1.4?
Signal-chaining enables the Java Platform to better interoperate with native code that installs its own signal handlers. The facility works on both Solaris and Linux platforms. The signal-chaining facility was introduced to remedy a problem with signal handling in previous versions of the Java Hotspot VM. Prior to version 1.4, the Java Hotspot VM would not allow application-installed signal handlers for certain signals including, for example, SIGBUS, SIGSEGV, SIGILL, etc, since those signal handlers could conflict with the signal handlers used internally by the Java Hotspot VM. The signal-chaining facility offers: • Support for pre-installed signal handlers when the Hotspot VM is created. • Support for signal handler installation after the Hotspot VM is created, inside JNI code or from another native thread. Pre-installed signal handlers (A) are supported by means of saving existing signal handlers, for signals that are used by the VM, when the VM is first created. Later, when any of t
