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title _lock | Microsoft Docs
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ms.date 11/04/2016
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lock
_lock
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lock function
_lock function
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_lock

Acquires a multi-thread lock.

Important

This function is obsolete. Beginning in Visual Studio 2015, it is not available in the CRT.

Syntax

void __cdecl _lock  
   int locknum  
);

Parameters

[in] locknum
The identifier of the lock to acquire.

Remarks

If the lock has already been acquired, this method acquires the lock anyway and causes an internal C run-time (CRT) error. If the method cannot acquire a lock, it exits with a fatal error and sets the error code to _RT_LOCK.

Requirements

Source: mlock.c

See Also

Alphabetical Function Reference
_unlock