Merge pull request #429 from buildkite/add-waitgroup-around-jobhandle…

…rworker

Add waitgroup around jobHandlerWorker

internal/controller/monitor/monitor.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"math/rand/v2"
 	"reflect"
+	"sync"
 	"time"
 
 	"github.com/Khan/genqlient/graphql"
@@ -208,8 +209,13 @@ func (m *Monitor) passJobsToNextHandler(ctx context.Context, logger *zap.Logger,
 	jobsCh := make(chan *api.JobJobTypeCommand)
 	defer close(jobsCh)
 
+	var wg sync.WaitGroup
 	for range min(m.cfg.JobCreationConcurrency, len(jobs)) {
-		go jobHandlerWorker(ctx, staleCtx, logger, handler, agentTags, jobsCh)
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			jobHandlerWorker(ctx, staleCtx, logger, handler, agentTags, jobsCh)
+		}()
 	}
 
 	for _, job := range jobs {
@@ -221,6 +227,8 @@ func (m *Monitor) passJobsToNextHandler(ctx context.Context, logger *zap.Logger,
 		case jobsCh <- job:
 		}
 	}
+
+	wg.Wait()
 }
 
 func jobHandlerWorker(ctx, staleCtx context.Context, logger *zap.Logger, handler model.JobHandler, agentTags map[string]string, jobsCh <-chan *api.JobJobTypeCommand) {