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Carl LercheandGitHub
2eabc37599
This patch makes a significant change to how I/O resources bind to a reactor. Currently, an I/O resource (TCP, UDP, PollEvented) will bind itself with a reactor upon creation. First, some history. Originally, tokio-core required that I/O resources be explicitly associated with a reactor upon creation by passing in a `&Handle`. Tokio reform introduced a default reactor. If I/O resources do not specify a reactor upon creation, then the default reactor is used. However, futures tend to favor being lazy. Creating a future should do no work, instead it is defining a computation to be performed once the future is executed. Binding an I/O resource with a reactor on creation goes against this pattern. This patch fixes this by allowing I/O resources to lazily bind to a reactor. An explicit `&Handle` can still be used on creation, but if no reactor is specified, then the default reactor is used. However, this binding happens during execution time (read / write) and not creation.