abort
| Definition: | abort(integer i) |
| Description: |
Abort execution of the program. The argument i is a small integer status value to be returned to the operating system. A value of 0 generally indicates successful completion of the program. Other values can indicate various kinds of errors. Batch programs (.bat or .cmd) can read this value using the %ERRORLEVEL% feature. A Phix program can read this value using system_exec(). |
| pwa/p2js: | Implemented as crash("abort(%d)",{i}). |
| Comments: | abort() is useful when a program is many levels deep in
subroutine calls, and execution must end immediately, perhaps
due to a severe error that has been detected.
If you do not use abort(), the application normally returns an exit status code of 0. If your program fails with a compile-time or run-time error then a code of 1 is usually returned. If a try/catch handler is in place, invoking abort(n) is mapped to throw(42,"abort(n)"). |
| Important: |
On Windows, an application should not use STILL_ACTIVE (259 or #103) aka STATUS_PENDING as an error code. Otherwise any other application waiting for it to terminate may hang indefinitely (whether written in Phix or not), and it is also quite likely to hamper attempts to shutdown or reboot the operating system. |
| Example: |
if x=0 then
puts(ERR, "can’t divide by 0 !!!\n")
abort(1)
else
z = y / x
end if
|
| Implementation: | via :%opAbort in builtins\VM\pStack.e (an autoinclude) - be warned however it is low-level complicated stuff that you do not need to know. |
| See Also: |
crash_message,
system_exec,
try,
throw |
