_ftell_nolock, _ftelli64_nolock

Article
06/05/2017

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The latest version of this topic can be found at _ftell_nolock, _ftelli64_nolock.

Gets the current position of a file pointer, without locking the thread.

Syntax

long _ftell_nolock(   
   FILE *stream   
);  
__int64 _ftelli64_nolock(   
   FILE *stream   
);

Parameters

stream
Target the FILE structure.

Return Value

Same as ftell and _ftelli64. For more information, see ftell, _ftelli64.

Remarks

These functions are non-locking versions of ftell and _ftelli64, respectively. They are identical to ftell and _ftelli64except that they are not protected from interference by other threads. These functions might be faster because they do not incur the overhead of locking out other threads. Use these functions only in thread-safe contexts such as single-threaded applications or where the calling scope already handles thread isolation.

Requirements

Function	Required header	Optional header
`ftell_nolock`	<stdio.h>	<errno.h>
`_ftelli64_nolock`	<stdio.h>	<errno.h>

For more compatibility information, see Compatibility in the Introduction.

.NET Framework Equivalent

System::IO::FileStream::Position

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