MSCVP140_ATOMIC_WAIT.2LL

[EJB]

what is MSVCP140_ATOMIC_WAIT.2LL.?
it showed up when i purchased tr22. i still haven't got the new version of trainz

 

[pdkoester]

MSVCP140_ATOMIC_WAIT.2LL is not a standalone file — it’s a symbol exported from msvcp140_atomic_wait.dll, which is part of the Microsoft Visual C++ Redistributable (the runtime library used by modern C++ applications). When Windows or an application reports an error mentioning this symbol, it usually means the DLL is missing, corrupted, or mismatched with the version the program expects.

What the symbol actually is​

• MSVCP140 refers to the Microsoft Visual C++ Standard Library implementation.
• ATOMIC_WAIT refers to internal C++20 atomic wait/notify primitives.
• .2LL is a mangled symbol suffix used by the compiler to identify a specific function signature.

In short, this symbol is part of the low‑level C++ standard library used by newer apps that rely on atomic wait/notify functionality.

Why errors appear​

Common causes include:

• corrupted Visual C++ Redistributable
• missing or outdated runtime files
• conflicting Microsoft 365 installations

How people typically fix it​

• Reinstall the latest Visual C++ Redistributable (x86 + x64) This is the most reliable fix.
• Repair existing VC++ installations Using “Modify → Repair” in Apps & Features.
• Remove duplicate/conflicting Microsoft 365 builds Some users had both Business and Enterprise editions installed.
• Copy the DLL from another working PC Only if you trust the source.

 

[EJB]

thanks for the reply .pdkoester.
this is way above my knowledge. i was curious about it showing up.
ejb
perhaps i can get my son in law to look at this. computers are his thing(his living).