Is there a "race condition"?

Looking into Smarty (2.3.1) code, I see that compiled template update is not atomic (fopen-flock-fwrite-fclose-touch) and there is no flock before include of it. Is there flock in PHP include code? Theoretically, it seems to me that one process can include compiled template just after another process discards its content in fopen (for writing). It means, one request will receive empty output. It is possible that parallel processes will compile a template (in the time between checking mtime and touching). It's not very bad, but some waste of performance. We are using PHPA accelerator, and it seems possible that empty compiled template can be cached. (It really happens with another caching systems or ftp file uploading). I'm not the perfect programmer. Can anybody investigate it? Anyway, if I'm right, the solution seems simple: write to a file with temporary name and rename it after touching (on linux renames are atomic). WBR, Konstantin A. Pelepelin