mirror of
https://gitlab.com/arm-research/smarter/smarter-device-manager.git
synced 2024-11-22 10:43:55 +00:00
55 lines
2.3 KiB
Go
55 lines
2.3 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// Package context defines the Context type, which carries deadlines,
|
|
// cancelation signals, and other request-scoped values across API boundaries
|
|
// and between processes.
|
|
//
|
|
// Incoming requests to a server should create a Context, and outgoing calls to
|
|
// servers should accept a Context. The chain of function calls between must
|
|
// propagate the Context, optionally replacing it with a modified copy created
|
|
// using WithDeadline, WithTimeout, WithCancel, or WithValue.
|
|
//
|
|
// Programs that use Contexts should follow these rules to keep interfaces
|
|
// consistent across packages and enable static analysis tools to check context
|
|
// propagation:
|
|
//
|
|
// Do not store Contexts inside a struct type; instead, pass a Context
|
|
// explicitly to each function that needs it. The Context should be the first
|
|
// parameter, typically named ctx:
|
|
//
|
|
// func DoSomething(ctx context.Context, arg Arg) error {
|
|
// // ... use ctx ...
|
|
// }
|
|
//
|
|
// Do not pass a nil Context, even if a function permits it. Pass context.TODO
|
|
// if you are unsure about which Context to use.
|
|
//
|
|
// Use context Values only for request-scoped data that transits processes and
|
|
// APIs, not for passing optional parameters to functions.
|
|
//
|
|
// The same Context may be passed to functions running in different goroutines;
|
|
// Contexts are safe for simultaneous use by multiple goroutines.
|
|
//
|
|
// See http://blog.golang.org/context for example code for a server that uses
|
|
// Contexts.
|
|
package context // import "golang.org/x/net/context"
|
|
|
|
// Background returns a non-nil, empty Context. It is never canceled, has no
|
|
// values, and has no deadline. It is typically used by the main function,
|
|
// initialization, and tests, and as the top-level Context for incoming
|
|
// requests.
|
|
func Background() Context {
|
|
return background
|
|
}
|
|
|
|
// TODO returns a non-nil, empty Context. Code should use context.TODO when
|
|
// it's unclear which Context to use or it is not yet available (because the
|
|
// surrounding function has not yet been extended to accept a Context
|
|
// parameter). TODO is recognized by static analysis tools that determine
|
|
// whether Contexts are propagated correctly in a program.
|
|
func TODO() Context {
|
|
return todo
|
|
}
|