runtime, sycall/js: add support for callbacks from JavaScript
This commit adds support for JavaScript callbacks back into WebAssembly. This is experimental API, just like the rest of the syscall/js package. The time package now also uses this mechanism to properly support timers without resorting to a busy loop. JavaScript code can call into the same entry point multiple times. The new RUN register is used to keep track of the program's run state. Possible values are: starting, running, paused and exited. If no goroutine is ready any more, the scheduler can put the program into the "paused" state and the WebAssembly code will stop running. When a callback occurs, the JavaScript code puts the callback data into a queue and then calls into WebAssembly to allow the Go code to continue running. Updates #18892 Updates #25506 Change-Id: Ib8701cfa0536d10d69bd541c85b0e2a754eb54fb Reviewed-on: https://go-review.googlesource.com/114197Reviewed-by:Austin Clements <austin@google.com> Reviewed-by:
Brad Fitzpatrick <bradfitz@golang.org>
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src/syscall/js/callback.go
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