| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> |
| <html> |
| <head> |
| <title>Global Data</title> |
| <link rel="stylesheet" href="style.css"> |
| </head> |
| |
| <body> |
| <? prevnext "<h1>Global Data</h1>" ?> |
| |
| In order to access global data, we again utilize Tcl's namespace |
| hierarchy: |
| |
| <pre> |
| namespace <span class="keyword">eval</span> request { |
| set ::global_data [clock seconds] |
| } |
| namespace delete request |
| |
| namespace <span class="keyword">eval</span> request { |
| puts <span class="string">"The last person to access this child process came at:"</span> |
| puts [clock format $::global_data] |
| } |
| namespace delete request</pre> |
| |
| As we can see, the first request sets a variable in the global |
| namespace, where it won't be destroyed when the 'request' |
| namespace is deleted. This makes it accessible to other scripts. |
| |
| <?footer?> |
| </body> |
| </html> |
