make_app(): return tornado.web.Application([ (r"/", MainHandler), ]) async def main(): app = make_app() app.listen(8888) await asyncio.Event().wait() if __name__ == "__main__": asyncio.run(main()) components like the IOLoop that use callbacks. Futures are usually transformed into their result with the await or yield keywords. Examples Here is a sample synchronous function: from tornado.httpclient import coroutine: from tornado.httpclient import AsyncHTTPClient async def asynchronous_fetch(url): http_client = AsyncHTTPClient() response = await http_client.fetch(url) return response.body Or for compatibility

return tornado.web.Application([ (r"/", MainHandler), ]) async def main(): app = make_app() app.listen(8888) await asyncio.Event().wait()if __name__ == "__main__": asyncio.run(main()) components like the IOLoop that use callbacks. Futures are usually transformed into their result with the await or yield keywords. Examples Here is a sample synchronous function: from tornado.httpclient import coroutine: from tornado.httpclient import AsyncHTTPClient async def asynchronous_fetch(url): http_client = AsyncHTTPClient() response = await http_client.fetch(url) return response.body Or for

373 17. Async 和 await . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 375 17.1. Futures 和 async 语法 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 378 17.2. 并发与 async . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 405 17.5. 深入理解 async 相关的 traits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

// up as an async_err here because it could have been the same // bytes we wrote via this Fh). int async_err = {0}; int take_async_err() { int e = async_err; async_err = 0;

other operations that use f(x): julia> g(x) = f(x) g (generic function with 1 method) julia> t = @async f(wait()); yield(); Now we add some new methods to f(x): julia> f(x::Int) = "definition for Int" julia> g(1) "definition for Int" julia> fetch(schedule(t, 1)) "original definition" julia> t = @async f(wait()); yield(); julia> fetch(schedule(t, 1)) "definition for Int"CHAPTER 12. METHODS 160 12 package called Sockets. Let's first create a simple server: julia> using Sockets julia> errormonitor(@async begin server = listen(2000) while true sock = accept(server) println("Hello World\n") end end)

other operations that use f(x): julia> g(x) = f(x) g (generic function with 1 method) julia> t = @async f(wait()); yield(); Now we add some new methods to f(x): julia> f(x::Int) = "definition for Int" julia> g(1) "definition for Int" julia> fetch(schedule(t, 1)) "original definition" julia> t = @async f(wait()); yield(); julia> fetch(schedule(t, 1)) "definition for Int"CHAPTER 12. METHODS 160 12 package called Sockets. Let's first create a simple server: julia> using Sockets julia> errormonitor(@async begin server = listen(2000) while true sock = accept(server) println("Hello World\n") end end)

other operations that use f(x): julia> g(x) = f(x) g (generic function with 1 method) julia> t = @async f(wait()); yield(); Now we add some new methods to f(x): julia> f(x::Int) = "definition for Int" julia> g(1) "definition for Int" julia> fetch(schedule(t, 1)) "original definition" julia> t = @async f(wait()); yield(); julia> fetch(schedule(t, 1)) "definition for Int" 13.6 Design Patterns with package called Sockets. Let's first create a simple server: julia> using Sockets julia> errormonitor(@async begin server = listen(2000) while true sock = accept(server) println("Hello World\n") end end)

other operations that use f(x): julia> g(x) = f(x) g (generic function with 1 method) julia> t = @async f(wait()); yield(); Now we add some new methods to f(x): julia> f(x::Int) = "definition for Int" julia> g(1) "definition for Int" julia> fetch(schedule(t, 1)) "original definition" julia> t = @async f(wait()); yield(); julia> fetch(schedule(t, 1)) "definition for Int" 13.6 Design Patterns with package called Sockets. Let's first create a simple server: julia> using Sockets julia> errormonitor(@async begin server = listen(2000) while true sock = accept(server) println("Hello World\n") end end)

other operations that use f(x): julia> g(x) = f(x) g (generic function with 1 method) julia> t = @async f(wait()); yield(); Now we add some new methods to f(x): julia> f(x::Int) = "definition for Int" julia> g(1) "definition for Int" julia> fetch(schedule(t, 1)) "original definition" julia> t = @async f(wait()); yield(); julia> fetch(schedule(t, 1)) "definition for Int" 13.6 Design Patterns with package called Sockets. Let's first create a simple server: julia> using Sockets julia> errormonitor(@async begin server = listen(2000) while true sock = accept(server) println("Hello World\n") end end)

other operations that use f(x): julia> g(x) = f(x) g (generic function with 1 method) julia> t = @async f(wait()); yield(); Now we add some new methods to f(x): julia> f(x::Int) = "definition for Int" julia> g(1) "definition for Int" julia> fetch(schedule(t, 1)) "original definition" julia> t = @async f(wait()); yield(); julia> fetch(schedule(t, 1)) "definition for Int" 13.6 Design Patterns with Base.AsyncCondition() wait(cond) The callback you pass to C should only execute a ccall to :uv_async_send, passing cond.handle as the argument, taking care to avoid any allocations or other interactions