Puzzled at callback routine Squid is using.

Hi, pals!

I am puzzled at the callback method of Squid. Such is the
routines that Squid is using for callback functions,

 * foo = xcalloc(sizeof(foo));
 * cbdataAdd(foo);
 * ...
 * cbdataLock(foo);
 * some_blocking_operation(..., callback_func, foo);
 * ...
 * some_blocking_operation_completes()
 * if (cbdataValid(foo))
 * callback_func(..., foo)
 * cbdataUnlock(foo);
 * ...
 * cbdataFree(foo);

I want to see an example that when some_blocking_operation is
called and when some_blocking_operation_completes() is called
and when finally callback_func(..., foo) is called.

Who can give me a description of simple example that Squid is using?

Best regards,
George Ma
Received on Fri Apr 19 2002 - 06:33:33 MDT