Multithreading becomes important as the number of core for the processor increases. This allows the possibility of parallelism and concurrency# along with their limitation# and short comings# with the utilisation of threads#. 202201301240# is one of the thinking model hinting on a better parallel and/or concurrency programming.
There are many language facilities and libraries that ease such management for the programmer:
In a multithreading environment#, real-time system an event-based application#, tracing statements (printing messages as simple as “got here” or “value of x is 2” to the screen or a log file) are more helpful than a debugger (with only stack trace, the state of a program now). They should be in a regular, consistent format so one could read or parse them easily.
Sync is a #202204061235 that allows the type to be referenced in a multithreading environment#. Rust primitive types has this trait implemented by default, and same as 202207172159, if the type is entirely composed of these types, then it will have this trait implicitly. Some types such as raw pointers, #202206221720 and Cell<T> related types (including #202206232210) doesn’t implement this trait.
Send is a #202204061235 that allows the ownership of implemented types to be transferred safely in a multithreading environment#. Almost all Rust types are implemented with Send trait, except #202206221720, and if the user’s custom type is composed of those types, then it will automatically have the Send trait. There is no method needed to be implemented in this trait.
However, it can’t be used in a multithreading environment# as it doesn’t implement the 202204061235# 202207172210#.
Rc<T> can’t be used in a multithreading environment# as it doesn’t implement the 202204061235# 202207172159# and 202207172210#.
Go uses message-passing as the basis for 202207171457 like #rust and 202203021733.
To avoid duplicate object initialisation in #multithreading environment using threads#, C standard library threads.h provides the function call_once which has the following definition: