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Old 10-26-2003, 10:33 AM   #1
b>d>>s
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Join Date: Feb 2003
Posts: 488
Unhappy checking/queueing access to file in tcl ?

hi, i started using a sql .dll in itcl for queueing access to the stats log file in a zipscript, but this is slow and mechanical (and now i got a new bug with it :X).

is there some trick to checking the status of a file with another tcl instance of zipscript, ie.

zs_1 has.ioftpd.log 'open' (thus i would read this as 'locked').
zs_2 checks 'status' of .ioftpd.log, if opened by another script ('locked'), queue.
zs_1 'closed' ('unlocked') .ioftpd.log
zs_2 'opens' .ioftpd.log (thus 'locking' it somehow).

?

any help, thx.
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Old 10-26-2003, 12:16 PM   #2
Mouton
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If you want to lock "testfile", try and create a *new* "testfile.lock" in the same directory. Repeat (with ample sleep) until this succeeds. To unlock, simply remove the file. This method is supported by almost all configurations.

flock might be avail too
http://osr5doc.ca.caldera.com:457/cg.../man?flock+TCL
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Old 10-26-2003, 12:46 PM   #3
b>d>>s
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ok, then to queue ? maybe, after ms ?script script script ...?

in a loop, ? say, ?

while {1} {
after 1000
set a [file exists "c:/blah.log"]
if {0 == $a} {
break
}
}

hmm, that should do it. what about thread safe stuff ?
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