Scheduling and timing

• spawn (callable out -- context): creates, schedules, and returns one new Context whose declared output schema is selected by out.
• yield (--): schedules the current context for later resumption and dispatches another ready context before returning.
• canceled? (-- canceled): reports whether the current context was canceled.
• sleepFor (duration --): wakes the current context not earlier than duration seconds later.
• sleepUntil (time --): wakes the current context not earlier than absolute time.
• getTime (-- time): returns the time elapsed since the sync subsystem was initialized.
• sleepFor and sleepUntil return immediately when the current context is already canceled.

Network helpers

• ipv4ToString (address -- addressString): converts one host-order IPv4 address in Nat32 representation to a dotted-decimal String.
• connectTcp (address port -- connection result): connects to a remote peer and returns one TcpConnection plus a result string.
• listenTcp (address port -- acceptor result): starts one listening TcpAcceptor and returns the acceptor plus a result string.
• connectTcp and listenTcp take host-order IPv4 addresses as Nat32 and host-order ports as Nat16.
• TcpAcceptor.accept returns the remote IPv4 address in the same host-order representation.

Result and ownership model

• A successful spawn call returns one Context handle that owns the spawned context state.
• A successful connectTcp call returns one TcpConnection wrapper that owns one connected stream.
• A successful listenTcp call returns one TcpAcceptor wrapper that owns one listening socket.
• connectTcp and listenTcp return the empty string on success and one non-empty result string on failure.
• On a non-empty result string, the returned TcpConnection or TcpAcceptor is invalid and owns no live operating-system resource.
• "canceled" means cancellation was observed before a successful network result was produced.
• ipv4ToString returns one new String that owns the formatted bytes.

Examples

IPv4 formatting and spawn

"sync/sync" use
"String" use
"control" use

{} Int32 {} [
  0xC0A86465n32 ipv4ToString print
  LF print
  context: [("done" LF) printList] () spawn;
  @context.wait
  0
] "main" exportFunction

Expected Output

192.168.100.101
done

See also

• sync/Context: Spawned context handle with waiting, output retrieval, and cancellation.
• sync/ContextGroup: Group of spawned contexts with shared waiting and cancellation.
• sync/Event: Persistent event state with clear, set, wait, wake, and wakeOne.
• sync/Signal: Wait queue with wake and wakeOne operations.
• sync/TcpAcceptor: Listening TCP acceptor with address reporting and accepted connection creation.
• sync/TcpConnection: Connected TCP stream with buffered read, string read, write, and shutdown operations.
• String: UTF-8 string views, owned strings, formatting helpers, and text conversion utilities.