Modern Fs File TryLock

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File.TryLock

Locks the whole file if it is free, or fails at once if another holder has it.

Syntax

File.TryLock( [ exclusive ] )

Notes

• Lock without waiting: FS_WOULD_BLOCK when another holder has it.

Examples

#import "std/fs"
using fs

dim as ustring dir_ = CreateTempDir( "tkdoc" ).Value( )
dim as ustring p = PathJoin( dir_, "f.txt" )
WriteAllText( p, "x" )
dim as File a, b
a.OpenRead( p ) : b.OpenRead( p )
a.Lock( )
print cbool( b.TryLock( ).Failure( ).Code( ) = FS_WOULD_BLOCK )    '' true
a.Unlock( )
print b.TryLock( ).IsOk( )    '' true
b.Unlock( )
a.Close( ) : b.Close( )

RemoveDirAll( dir_ )

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Library: Filesystem Library Category: File Streams Documented under: Files