In some cases, you will encounter callback functions that are defined via weak linkage, or that are declared but not defined.This can be a variable that holds a single value, a static array of values with a maximum size, or a dynamic list of values.Asynchronous callbacks are often added to a queue of some time, and (depending on the system’s properties) are likely to execute after the invoking function returns, possibly in another thread of execution.Ĭallbacks involve the following primary components:.Synchronous callbacks are invoked before a function returns and in the same thread context as the calling function.The expectation is that the supplied reference will be executed whenever a specific condition occurs (typically, a completed event).Ĭallbacks can be categorized as synchronous (aka “blocking”) or asynchronous (aka “deferred”), which refers to how the callback function is invoked. A callback is a reference to a function (or function-like object) that is passed as an argument to another module.
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