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Is it always necessary to lock a text file?

( #19715=categorized question: print w/ replies, xml ) Need Help??
Contributed by Anonymous Monk on Jun 24, 2000 at 14:39 UTC
Q&A  > files


Description:

I read the same text file from many pages, but only for read. Must the text file always be locked for security?

Answer: Is it always necessary to lock a text file?
contributed by lhoward

If you are only reading a file, you do not need to lock it. Locks are only important when writing to the file is involved.

Answer: Is it always necessary to lock a text file?
contributed by Anonymous Monk

Locking the file is not necessary when reading only, and when writing only if there is a possibility of more than one write happening simultaneously (as in the case of a cgi script or multi-user environment) If you are the only person using your script, or if it is a standalone script that only runs on one machine, locking is not necessary.

Answer: Is it always necessary to lock a text file?
contributed by I0

If the file is being written while you are reading, it may be neccesary to LOCK_SH to avoid reading an inconsistent partial update.

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