Anton Reisacher napsal(a):
>How safe is catch?
>
>I have some rebol applications serving message communication (around 1000 to
>2000 messages per day mostly) running for more than half a year on
>Windows2000 Server without interruption since the last update of the OS for
>security reasons.
>
>Recently I had to add some message splitting:
>one-message --> [message-part-1 message-part-2 message-part-3]
>
>I used a construct similar to this
>
>forever [
> until [new-messages-available]
> foreach message new-messages [
> catch [
> if not important [throw]
> do-some-heavy-message-processing-and
> data-completion-using-odbc
> if some-tests [throw]
> message-parts: split-messages message
> until [
> catch [
> message: first message-parts
> do-more-conversions
> if other-tests [throw]
> deliver message
> emtpy? message-parts: next message-parts
> ]
> ]
> ]
> ]
>]
>
>Now I saw two crashes in one day.
>I was somehow able to reproduce the crash
>"Invalid data type during recycle"
>by playing again the history of one to two weeks. But the crash happened
>always processing another message.
>
>As I had seen in the past instable behaviour with constructs like this
>foreach ... [
> catch [
> ..
> data: any [
> a
> b
> throw
> ]
> ..
> ..
> ]
>]
>
>I replaced the inner catch with statements like this
> if not other-tests [
> deliver message
> ]
>and the crash went away.
>
>Now I am curious if someone else encountered the same behaviour too?
>
>
>
hi Anton, I needed a slightly different Catch version than the
"official" one. Try this to see if things go better:
Rebol [
Title: "Catch"
File: %catch.r
Date: 4/Mar/2005/17:12
Author: "Ladislav Mecir"
Purpose: {
Catches local throw'
Ignores non-local throws
Works with Parse
}
]
; Evaluation of the following global functions is an error
return': func [[catch]] [throw make error! [throw not-local]]
exit': func [[catch]] [throw make error! [throw not-local]]
throw': func [[catch]] [throw make error! [throw not-local]]
; Error definition
system/error/throw: make system/error/throw [
not-local: "Global return', exit' or throw' evaluated"
]
catch': func [
{Catches a throw' from a block and returns the value.}
block [block!] "Block to evaluate"
/local throw' result1 result2 result1?
] [
; "localize" 'throw' in the block
set [throw' block] use [throw'] reduce [
reduce ['throw' copy/deep block]
]
set throw' func [value [any-type!]] [
error? set/any 'result1 get/any 'value
result1?: true
make error! ""
]
either error? set/any 'result2 try block [
either result1? [return get/any 'result1] [result2]
] [return get/any 'result2]
]
comment [
; Usage:
catch' [parse "ssss" [(throw' "OK")]]
]
-L
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