- A call is asynchronous if the caller proceeds after the call is made, and the callee receives the call during the next main loop iteration. Asynchronous calls help avoid nasty call-me-when-I-call-you loops that humans often have trouble understanding or implementing correctly.
- Asynchronous calls are currently implemented via Squid events. The call event stores the pointer to the callback function and cbdata-protected callback data. To call a method of an object, the method is wrapped in a method-specific, static callback function and the pointer to the object is passed to the wrapper. For the method call to be safe, the class must be cbdata-enabled.
- You do not have to use the macros below to make or receive asynchronous method calls, but they give you a uniform interface and handy call debugging.
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