thread An independent flow of control within a single process, having its | |
| own register set and program counter. The |
| |
Thread Trace | See ttv |
Visualizer |
|
trap | A change in system state that is caused by an exception and that may be |
| detected by the executing program that took the exception. Traps are |
| hardware features that may be enabled or disabled. If traps are enabled, |
| they can change the flow of control in the program that took the exception. |
| In response to a trap, the system may generate a signal (for example, |
| SIGFPE), which the program can detect. Such a program can be designed |
| to handle traps. HP Fortran 90 provides the ONstatement to handle traps. |
ttv | A tool for analyzing |
tty buffering | A method for efficiently processing data that is directed to standard output |
| by capturing it in a buffer before sending it to the screen. |
underflow An | condition that occurs when the result of a |
exception | than the smallest normalized number. On systems that support it, fast |
| underflow is an efficient method of handling this exception. |
vectorization | An optimization technique that replaces eligible program loops that operate |
| on arrays with calls to specially tuned routines that perform the same |
| operation. |
Time spent by an executing program that includes system time as well as | |
| process time. In contrast, virtual time takes into account process time only. |
| Profilers (such as CXperf) that track both virtual time and |
| provide information about when a program is blocked as well as when it |
| is running. |
HP WDB | The HP Wildebeest Debugger (WDB) is an |
| of the Open Source GNU debugger (GDB). |
158 Glossary