VCSAgLockFile


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VCSAgLockFile

int VCSAgLockFile(const char *fname, VCSAgLockType ltype, VCSAgBlockingType btype, VCSAgErrnoType *errp)

Get a read or write (that is, shared or exclusive) lock on the given file. Both blocking and non-blocking modes are supported. Returns 0 if the lock could be obtained, or returns VCSAgErrWouldBlock if non-blocking is requested and the lock is busy. Otherwise returns -1. Each thread is considered a distinct owner of locks.

Warning: Do not do any operations on the file (ex, open, or close) within this process, except through the VCSAgReadLockFile(), VCSAgWriteLockFile(), and VCSAgUnlockFile() interfaces.

Mt-safe; deferred cancel safe.


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