► |  | Reference: PLT Scheme

1 | Language Model
2 | Syntactic Forms
3 | Datatypes
4 | Structures
5 | Classes and Objects
6 | Units
7 | Contracts
8 | Pattern Matching
9 | Control Flow
10 | Concurrency
11 | Macros
12 | Input and Output
13 | Reflection and Security
14 | Operating System
15 | Memory Management
16 | Running PLT Scheme
| Bibliography
| Index

► | 10 | Concurrency

10.1 | Threads
10.2 | Synchronization
10.3 | Thread-Local Storage

▼ | 10.2 | Synchronization

10.2.1 | Events
10.2.2 | Channels
10.2.3 | Semaphores
10.2.4 | Buffered Asynchronous Channels

On this page:

async-channel?
make-async-channel
async-channel-get
async-channel-try-get
async-channel-put
async-channel-put-evt

Version: 4.1.4
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##### 10.2.4`` Buffered Asynchronous Channels

(require scheme/async-channel)

The bindings documented in this section are provided by the scheme/async-channel library, not scheme/base or scheme.

See also Thread Mailboxes.

(async-channel? v) → boolean?
v : any/c

Returns #t if v is an asynchronous channel, #f otherwise.

(make-async-channel [limit]) → async-channel?
limit : (or/c exact-positive-integer? #f) = #f

Returns an asynchronous channel with a buffer limit of limit items. A get operation blocks when the channel is empty, and a put operation blocks when the channel has limit items already. If limit is #f, the channel buffer has no limit (so a put never blocks).

The asynchronous channel value can be used directly with sync. The channel blocks until async-channel-get would return a value, and the unblock result is the received value.

(async-channel-get ach) → any/c
ach : async-channel?

Blocks until at least one value is available in ach, and then returns the first of the values that were put into async-channel.

(async-channel-try-get ach) → any/c
ach : async-channel?

If at least one value is immediately available in ach, returns the first of the values that were put into ach. If async-channel is empty, the result is #f.

(async-channel-put ach v) → void?
ach : async-channel?
v : any/c

Puts v into ach, blocking if ach’s buffer is full until space is available.

(async-channel-put-evt async-channel v) → evt?
async-channel : channel?
v : any/c

Returns a synchronizable event that is blocked while (async-channel-put ach v) would block. The unblock result is the event itself. See also sync.

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