decorated coroutines How it works How to call a coroutine Coroutine patterns Calling blocking functions Parallelism Interleaving Looping Running in the background Queue example - a concurrent web spider why CPU blocking must be taken as seriously as other kinds of blocking, consider password hashing functions like bcrypt [http://bcrypt.sourceforge.net/], which by design use hundreds of milliseconds of CPU background before triggering some future action in the application (as opposed to normal synchronous functions, which do everything they are going to do before returning). There are many styles of asynchronous

. . . . . . . . . . . . . . . . . . . . . . . . . 25 5 Mathematical Operations and Elementary Functions 26 5.1 Arithmetic Operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Raw String Literals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 8 Functions 67 8.1 Argument Passing Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 Keyword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 8.4 Operators Are Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 8.5 Operators With Special Names

. . . . . . . . . . . . . . . . . . . . . . . . . 25 5 Mathematical Operations and Elementary Functions 26 5.1 Arithmetic Operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Raw String Literals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 8 Functions 67 8.1 Argument Passing Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 Keyword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 8.4 Operators Are Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 8.5 Operators With Special Names

. . . . . . . . . . . . . . . . . . . . . . . . . 29 6 Mathematical Operations and Elementary Functions 30 6.1 Arithmetic Operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Annotated Strings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 9 Functions 72 9.1 Argument Passing Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Keyword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 9.4 Operators Are Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 9.5 Operators With Special Names

. . . . . . . . . . . . . . . . . . . . . . . . . 29 6 Mathematical Operations and Elementary Functions 30 6.1 Arithmetic Operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Annotated Strings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 9 Functions 72 9.1 Argument Passing Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Keyword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 9.4 Operators Are Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 9.5 Operators With Special Names

. . . . . . . . . . . . . . . . . . . . . . . . . 29 6 Mathematical Operations and Elementary Functions 30 6.1 Arithmetic Operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Annotated Strings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 9 Functions 72 9.1 Argument Passing Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Keyword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 9.4 Operators Are Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 9.5 Operators With Special Names

. . . . . . . . . . . . . . . . . . . . . . . . . 29 6 Mathematical Operations and Elementary Functions 30 6.1 Arithmetic Operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Annotated Strings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 9 Functions 72 9.1 Argument Passing Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Keyword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 9.4 Operators Are Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 9.5 Operators With Special Names

. . . . . . . . . . . . . . . . . . . . . . . . . 29 6 Mathematical Operations and Elementary Functions 30 6.1 Arithmetic Operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Annotated Strings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 9 Functions 72 9.1 Argument Passing Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Keyword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 9.4 Operators Are Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 9.5 Operators With Special Names

. . . . . . . . . . . . . . . . . . . . . . . . . 29 6 Mathematical Operations and Elementary Functions 30 6.1 Arithmetic Operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Annotated Strings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 9 Functions 72 9.1 Argument Passing Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Keyword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 9.4 Operators Are Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 9.5 Operators With Special Names

. . . . . . . . . . . . . . . . . . . . . . . . . 29 6 Mathematical Operations and Elementary Functions 30 6.1 Arithmetic Operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Annotated Strings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 9 Functions 72 9.1 Argument Passing Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Keyword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 9.4 Operators Are Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 9.5 Operators With Special Names