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The latest version of this topic can be found at _lock.

Acquires a multi-thread lock.

System_CAPS_ICON_important.jpg Important

This function is obsolete.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

void __cdecl _lock  
   int locknum  


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

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.

Source: mlock.c

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