# Semaphore files used by the network¶

WWIV's network stack uses a handful of semaphore files to block concurrent access while operations are ongoing. Here's the list of semaphore files currently used.

## Network Semaphores¶

These Semaphore files reside in or in a subdirectory of the WWIV network directory (i.e. `C:\bbs\net\wwivnet` is the default wwivnet network directory).

In these examples, we'll use `[network]` to denote the network directory.

### All network types¶

[network]/[networkn].bsy

Where `[networkn]` is the name of the network command e.g. `network1`. It's used to denote that the network command is running and additional copies should not attempt to execute.

### FTN Networks¶

[network]/out/[flo_name].bsy

Where `[flo_name]` is the same name as a FLO file, blocks access to manipulating the FLO file while it is being rewritten with information.