Unix Signal
A signal is a limited form of inter-process communication used in Unix, Unix-like, and other POSIX-compliant operating systems. It is an asynchronous notification sent to a process or to a specific thread within the same process in order to notify it of an event that occurred. When a signal is sent, the operating system interrupts the target process's normal flow of execution. Execution can be interrupted during any non-atomic instruction. If the process has previously registered a signal handler, that routine is executed. Otherwise the default signal handler is executed. Signals have been around since the 1970s Bell Labs Unix and are more recently specified in the POSIX standard.
Read more about Unix Signal: Sending Signals, Handling Signals, Relationship With Hardware Exceptions, POSIX Signals, Miscellaneous Signals
Famous quotes containing the word signal:
“A signal is comprehended if it serves to make us notice the object or situation it bespeaks. A symbol is understood when we conceive the idea it presents.”
—Susanne K. Langer (1895–1995)