Remove pkg/util/rendezvous.

This package is unused.

pkg/util/rendezvous/rendezvous.go

@@ -1,86 +0,0 @@
-// Copyright 2016-2018, Pulumi Corporation.  All rights reserved.
-
-package rendezvous
-
-import (
-	"sync"
-
-	"github.com/pulumi/pulumi/pkg/util/contract"
-)
-
-// New allocates a new rendezvous meeting point for two coroutines.
-func New() *Rendezvous {
-	m := &sync.Mutex{}
-	return &Rendezvous{
-		lock: m,
-		cond: sync.NewCond(m),
-		turn: PartyA,
-		data: nil,
-		done: false,
-	}
-}
-
-// Party represents one of two meeting parties for a rendezvous point.
-type Party int
-
-const (
-	PartyA Party = 0
-	PartyB Party = 1
-)
-
-// Rendezvous is a meeting point for two coroutines that ensures only one proceeds at a given time.
-type Rendezvous struct {
-	lock *sync.Mutex // locks to synchronize access to the turn.
-	cond *sync.Cond  // condition variables to awaken parties as needed.
-	turn Party       // the current party permitted through the rendezvous.
-	data interface{} // optional data exchanged with the other party.
-	done bool        // true when the rendezvous has become closed.
-	err  error       // non-nil if an error was submitted at closing time.
-}
-
-// Let lets the other party to run a turn and then returns.
-func (rz *Rendezvous) Let(me Party) (interface{}, bool, error) {
-	rz.lock.Lock()
-	defer rz.lock.Unlock()
-	for rz.turn != me && !rz.done {
-		rz.cond.Wait()
-	}
-	return rz.data, rz.done, rz.err
-}
-
-// Meet arrives at the meeting point and gives away the current turn.  The turn must be owned by the current party.
-func (rz *Rendezvous) Meet(me Party, data interface{}) (interface{}, bool, error) {
-	rz.lock.Lock()
-	defer rz.lock.Unlock()
-
-	// Give away the turn.
-	contract.Assert(rz.turn == me)
-	rz.data = data   // advertise our new data (if any).
-	rz.flipTurn()    // let the other party run.
-	rz.cond.Signal() // now signal to them, in case they are awaiting.
-
-	// Wait until its our turn again.
-	for rz.turn != me && !rz.done {
-		rz.cond.Wait()
-	}
-
-	return rz.data, rz.done, rz.err
-}
-
-// Done signals to any waiters that the rendezvous is done.
-func (rz *Rendezvous) Done(err error) {
-	rz.lock.Lock()
-	defer rz.lock.Unlock()
-	rz.err = err
-	rz.done = true
-	rz.cond.Broadcast() // awaken any in case they are sleeping
-}
-
-// flipTurn lets the opposite party through the rendezvous point.
-func (rz *Rendezvous) flipTurn() {
-	if rz.turn == PartyA {
-		rz.turn = PartyB
-	} else {
-		rz.turn = PartyA
-	}
-}