простой файловый мьютекс (simple file-based mutex)
Имя (Name)
pmlock - simple file-based mutex
Синопсис (Synopsis)
$PCP_BINADM_DIR/pmlock [-v] file
Описание (Description)
pmlock attempts to acquire an exclusive lock by creating file
with a mode of 0.
The exit status is 0 for success, 1 for failure.
To release the lock, unlink file.
In the event of a failure, the -v option produces an explanatory
message on stdout.
