Regionalliga Southwest Predictions

Tactical Discipline: SV Sandhausen II

SV Sandhausen II's success can largely be attributed to their tactical discipline. The team operates like a well-oiled machine, with each player understanding their role perfectly. Their coach emphasizes maintaining structure and composure under pressure, which has paid dividends in tight matches.

Key Players:

Martin Müller: A midfield maestro known for his vision and passing accuracy.
Lukas Schneider: A reliable defender who excels in intercepting opposition plays.

<|repo_name|>superman99/rfcs<|file_sep|>/text/0021-async-scheduler.md - Feature Name: async-scheduler - Start Date: August 5th, 2016 - RFC PR: [rust-lang/rfcs#2108](https://github.com/rust-lang/rfcs/pull/2108) - Rust Issue: [rust-lang/rust#31257](https://github.com/rust-lang/rust/issues/31257) # Summary [summary]: #summary This RFC proposes that we introduce an "async" scheduler as part of futures-rs, and expose it via `std::task`. The async scheduler should provide an interface for executing futures in parallel without blocking threads. # Motivation [motivation]: #motivation The motivation for introducing an async scheduler is so that we can implement the async version of `std::thread::spawn` as part of `std::task`. This function will allow us to spawn futures onto the async scheduler without having to block threads. This will allow us to write libraries that use futures in parallel without having any knowledge about how these futures are scheduled. It will also make it easier for users that want more control over how futures are scheduled (i.e., whether they want blocking threads or not) since they can use this new API directly. Finally, it will help simplify some APIs that currently require users to spawn threads in order to execute futures (e.g., tokio's `run` function). ## Use Cases ### Spawning Futures The primary use case is spawning futures onto an executor without blocking threads: rust let handle = task::spawn(async { let result = io::read_to_string("foo.txt").await; println!("{}", result); }); This will spawn the future onto an executor that does not block threads while waiting for IO operations. ### Spawning Blocking Futures In some cases it might be useful to spawn blocking futures onto an executor that does not block threads: rust let handle = task::spawn_blocking(async { let result = sync::blocking_io::read_to_string("foo.txt"); println!("{}", result); }); This will spawn the future onto an executor that does not block threads while waiting for blocking IO operations. # Guide-level explanation [guide-level-explanation]: #guide-level-explanation ## Spawn Function The `task::spawn` function will take an async block as input: rust,no_run,noplayground use std::task; fn main() { task::spawn(async { // do something here... }); } The `task::spawn` function will return a `JoinHandle`: rust,no_run,noplayground use std::task; fn main() { let handle = task::spawn(async { // do something here... }); // ... } The `JoinHandle` can be used to wait for completion: rust,no_run,noplayground use std::task; fn main() { let handle = task::spawn(async { // do something here... }); handle.await; } It can also be used to get access to any value returned by the spawned future: rust,no_run,noplayground use std::task; fn main() { let handle = task::spawn(async { // do something here... "Hello World!" }); let result = handle.await; assert_eq!(result.unwrap(), "Hello World!"); } ### Spawn Blocking Function In addition to `task::spawn`, there should also be a `task::spawn_blocking` function: rust,no_run,noplayground use std::task; fn main() { let handle = task::spawn_blocking(|| { sync::blocking_io::read_to_string("foo.txt"); }); let result = handle.await; println!("{}", result.unwrap()); } The `task::spawn_blocking` function will return a `JoinHandle` just like `task::spawn`. ## JoinHandle The `JoinHandle` type represents a handle that can be used to wait for completion of a spawned future or get access to its return value: rust,no_run,noplayground use std::task; fn main() { let handle = task::spawn(async { // do something here... "Hello World!" }); let result = handle.await; assert_eq!(result.unwrap(), "Hello World!"); } It implements both `Future` and `Send` (if it was spawned using `task::spawn`) or `Sync + Send` (if it was spawned using `task::spawn_blocking`). It also implements the following methods: * `join`: Waits for completion of this future without returning any value. * `join_with`: Waits for completion of this future and returns its return value. ### JoinHandle Example Here's an example of using `JoinHandle`: rust,no_run,noplayground use std::{future::FutureExt as _, task}; fn main() { let mut handles = vec![]; for i in 0..10 { handles.push(task::spawn(async move { // do something here... i * i * i * i * i * i * i * i * i * i * i * i * i * i * i * i * i * i * i * i * i * i * i * i * i * i * i * i * (i + 1) })); } let mut results = Vec::new(); for handle in handles.drain(..) { results.push(handle.join().unwrap()); } assert_eq!(results.len(), handles.len()); } # Reference-level explanation [reference-level-explanation]: #reference-level-explanation ## Spawn Function The `task::spawn` function will take an async block as input: rust,no_run,noplayground use std::{future::FutureExt as _, task}; fn main() -> Result<(), Box> { task::block_on(async move { task::spawn(async { // do something here... }) .await?; Ok(()) }) } It returns a `JoinHandle`, which implements both `Future` and `Send`. It also provides two methods: * `join`: Waits for completion of this future without returning any value. * `join_with`: Waits for completion of this future and returns its return value. ### Spawn Blocking Function In addition to `task::spawn`, there should also be a `task::spawn_blocking` function: rust,no_run,noplayground use std::{future::{FutureExt as _, TryFutureExt as _}, task}; fn main() -> Result<(), Box> { task::block_on(async move { let handle = task::{self}::{spawn_blocking}(|| sync::{blocking_io}::{read_to_string}("foo.txt")); let result = handle.await?; println!("{}", result); Ok(()) }) } The `task::{self}::{spawn_blocking}` function will return a `{JoinHandle}`, which implements both `{Future}` and `{Sync + Send}`. ## JoinHandle The `{JoinHandle}` type represents a handle that can be used to wait for completion of a spawned future or get access to its return value: rust,no_run,noplayground use std::{future::{FutureExt as _, TryFutureExt as _}, task}; fn main() -> Result<(), Box> {' task'{block_on}(async move {' let mut handles = vec![]; for'0..10'{ handles.push(task:{self}::{spawn}(async move {' // do something here... 'i' ' '* 'i' ' '* 'i' ' '* 'i' ' '* 'i' ' '* 'i' ' '* 'i' ' '* 'i' ' '* 'i' ' '* 'i' ' '* 'i' ' '* 'i' ' '* 'i' ' '* 'i' ' '* 'i' '+' (1)' })); } let mut results = Vec:{new}(); for handle'in handles.{drain}(..) {' results.push(handle.{join}().??); } assert_eq!(results.{len}(), handles.{len}()); Ok(()) }) } It implements both `{Future}` and `{Send}` (if it was spawned using `{task}:{self}:{spawn}`) or `{Sync + Send}` (if it was spawned using `{task}:{self}:{spawn_blocking}`). It also implements the following methods: * `{join}`: Waits for completion of this future without returning any value. * `{join_with}`: Waits for completion of this future and returns its return value. ### JoinHandle Example Here's an example of using `{JoinHandle}`: rust,no_run,noplayground' use std::{future::{FutureExt as _, TryFutureExt as _}, task}; fn main() -> Result<(), Box>{' task'{block_on}(async move {' let mut handles = vec![]; for'0..10'{' handles.push(task:{self}::{spawn}(async move {' // do something here... 'i' '*' 'i'*'*'*'*'*'*'*'*'*'*'*'*'*'*'*'*'*'*'*'(1)' })); } let mut results = Vec:{new}(); for handle'in handles.{drain}(..){' results.push(handle.{join}().??); } assert_eq!(results.{len}(), handles.{len}()); Ok(()) }) } # Drawbacks [drawbacks]: #drawbacks Introducing an async scheduler adds some complexity to Rust's standard library. However, we believe that this complexity is justified by the benefits it provides. ## Alternative Approaches There are several alternative approaches we could take instead of introducing an async scheduler: 1. **Don't add anything**: We could simply leave things as they are now, without adding any new functionality. 2. **Add only one function**: We could add only one function (`{SpawnFn}`) that takes an async block as input and returns a `{SpawnedTask}`, which implements both `{Future}` and `{Send}` (or `{Sync + Send}`). This would simplify things considerably but would limit flexibility since users wouldn't have access to all features provided by our proposed design (e.g., getting access to return values). 3. **Add two functions**: We could add two functions (`{SpawnFn}` & `{SpawnBlockingFn}`), one taking an async block as input while returning `{SpawnedTask}` implementing only `{Future}`, while another taking closure/block taking no arguments while returning same type implementing both `{Send}/{Sync+Send}`, respectively; then user would need manually wrap/blocking code inside closure/block before calling appropriate version depending on whether he wants blocking/non-blocking behavior from resulting spawned task(s). This approach would provide more flexibility than option #2 but would still limit users since they would need manually wrap/blocking code themselves before calling appropriate version depending on whether he wants blocking/non-blocking behavior from resulting spawned task(s). 4. **Add three functions**: We could add three functions (`{SpawnFn}`, `{SpawnBlockingFn}`, & '{SpawnBlockingFnReturning}' ) where first two behave same way like options #1 & #2 respectively; third one however differs slightly by taking closure/block returning value instead returning none like previous ones; thus allowing user get access directly returned values instead needing manual wrapping inside closure/block before calling appropriate version depending on whether he wants blocking/non-blocking behavior from resulting spawned tasks(s). This approach would provide even more flexibility than option #3 but would still limit users since they would need manually wrap/blocking code themselves before calling appropriate version depending on whether he wants blocking/non-blocking behavior from resulting spawned tasks(s). We believe our proposed design strikes good balance between simplicity & flexibility while providing all features needed by users who want write libraries using futures without having any knowledge about how those futures scheduled behind scenes nor needing manually wrap/blocking code themselves before calling appropriate version depending upon whether he wants blocking/non-blocking behavior from resulting spawned tasks(s). # Rationale and alternatives [rationale-and-alternatives]: #rationale-and-alternatives ## Why not just use existing executors? There are already several executors available in Rust (e.g., tokio, async-std). However, these executors are designed primarily for use within specific libraries, and may not be suitable for use outside those libraries. For example, tokio's executor requires users call its own runtime APIs when spawning futures, while async-std requires users call its own runtime APIs when spawning tasks (which are similar but not identical). Additionally, neither executor provides support for spawning blocking futures without blocking threads, which limits their usefulness when writing libraries that want more control over how futures are scheduled. Finally, neither executor provides support

Regionalliga Southwest stats & predictions

The Thrilling World of Regionalliga Southwest Germany

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Tactical Insights: What Makes These Teams Stand Out?

Tactical Discipline: SV Sandhausen II

Key Players: