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Copyright 1991 David Jurgens |
MSC: int locking( int handle, int mode, long nbytes )
- prototype in io.h, sys\locking.h
- handle = opened file handle
- nbytes = bytes to lock beginning with current file position
- mode = locking mode:
= LK_LOCK lock region; on failure waits 1 sec and
attempts again; tries 10 times
= LK_RLCK same as LK_LOCK
= LK_NBLCK lock region; returns immediately on error
= LK_NBRLCK lock region; returns immediately on error
= LK_UNLCK unlock previously locked region
- multiple locks may occur in a single file
- overlapping locked regions are not allowed
- returns 0 on success or -1 on failure
- Turbo C uses lock() and unlock()
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locking |
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