_ftell_nolock
, _ftelli64_nolock
Gets the current position of a file pointer without locking.
long _ftell_nolock(
FILE *stream
);
__int64 _ftelli64_nolock(
FILE *stream
);
stream
Target the FILE
structure.
Same as ftell
and _ftelli64
. For more information, see ftell
, _ftelli64
.
These functions are non-locking versions of ftell
and _ftelli64
, respectively. They're identical to ftell
and _ftelli64
except that they aren't protected from interference by other threads. These functions might be faster because they don't 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.
By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.
Function | Required header | Optional header |
---|---|---|
ftell_nolock |
<stdio.h> | <errno.h> |
_ftelli64_nolock |
<stdio.h> | <errno.h> |
For more compatibility information, see Compatibility.
Stream I/O
fgetpos
fseek
, _fseeki64
_lseek
, _lseeki64
ftell
, _ftelli64