An interrupt caused by a specific machine language operation code (e.g. the Motorola 68000’s TRAP, the IBM System/390’s SVC or the ARM’s SWI) rather than by a hardware event.
As with a hardware interrupt, this causes the processor to store the current state, store identifying information about the particular interrupt, and pass control to a first level interrupt handler.
A trap is similar except that it is caused by an unexpected software condition or error (e.g. divide by zero, undefined instruction) rather than a deliberate instruction.
- Software laser
An optical laser works by bouncing photons back and forth between two mirrors, one totally reflective and one partially reflective. If the lasing material (usually a crystal) has the right properties, photons scattering off the atoms in the crystal will excite cascades of more photons, all in lockstep. Eventually the beam will escape through the […]
- Software law
legal Software may, under various circumstances and in various countries, be restricted by patent or copyright or both. Most commercial software is sold under some kind of software license. A patent normally covers the design of something with a function such as a machine or process. Copyright restricts the right to make and distribute copies […]
- Software method
- Software methodology
programming The study of how to navigate through each phase of the software process model (determining data, control, or uses hierarchies, partitioning functions, and allocating requirements) and how to represent phase products (structure charts, stimulus-response threads, and state transition diagrams). (1996-05-29)