diff --git a/worker/agent.go b/worker/agent.go
index 66bf4c1..1e0fe45 100644
--- a/worker/agent.go
+++ b/worker/agent.go
@@ -72,7 +72,6 @@ func (a *agent) inLoop() {
         rel, err := a.read()
         if err != nil {
             if err == common.ErrConnection {
-                // TODO: reconnection
                 for i:= 0; i < 3 && a.worker.running; i++ {
                     if conn, err := net.Dial(common.NETWORK, a.addr); err != nil {
                         a.worker.err(common.Errorf("Reconnection: %d faild", i))
diff --git a/worker/job.go b/worker/job.go
index 687ffb1..71d9ce5 100644
--- a/worker/job.go
+++ b/worker/job.go
@@ -16,13 +16,16 @@ type Job struct {
     Handle, UniqueId    string
     agent               *agent
     magicCode, DataType uint32
+    c chan bool
 }
 
 // Create a new job
 func newJob(magiccode, datatype uint32, data []byte) (job *Job) {
     return &Job{magicCode: magiccode,
         DataType: datatype,
-        Data:     data}
+        Data:     data,
+        c: make(chan bool),
+    }
 }
 
 // Decode job from byte slice
@@ -88,3 +91,13 @@ func (job *Job) UpdateStatus(numerator, denominator int) {
     result = append(result, d...)
     job.agent.WriteJob(newJob(common.REQ, common.WORK_STATUS, result))
 }
+
+// cancel the job executing
+func (job *Job) cancel() {
+    job.c <- true
+}
+
+// When a job was canceled, return a true form a channel
+func (job *Job) Canceled() chan bool {
+    return job.c
+}
diff --git a/worker/worker.go b/worker/worker.go
index 5d25b42..dd99c44 100644
--- a/worker/worker.go
+++ b/worker/worker.go
@@ -5,6 +5,7 @@
 package worker
 
 import (
+    "time"
     "bytes"
     "bitbucket.org/mikespook/gearman-go/common"
 )
@@ -271,21 +272,36 @@ func (worker *Worker) exec(job *Job) (err error) {
     if !ok {
         return common.Errorf("The function does not exist: %s", funcname)
     }
-    result, err := f.f(job)
+    rslt := make(chan *result)
+    defer close(rslt)
+    go func() {
+        defer func() {recover()}()
+        var r result
+        r.data, r.err = f.f(job)
+        rslt <- &r
+    }()
+    var r *result
+    select {
+    case r = <-rslt:
+    case <-time.After(time.Duration(f.timeout) * time.Second):
+        r = &result{data:nil, err: common.ErrExecTimeOut}
+        job.cancel()
+    }
     var datatype uint32
-    if err == nil {
+    if r.err == nil {
         datatype = common.WORK_COMPLETE
     } else {
-        if result == nil {
+        if r.data == nil {
             datatype = common.WORK_FAIL
         } else {
             datatype = common.WORK_EXCEPTION
         }
+        err = r.err
     }
 
     job.magicCode = common.REQ
     job.DataType = datatype
-    job.Data = result
+    job.Data = r.data
     job.agent.WriteJob(job)
     return
 }
@@ -300,3 +316,8 @@ func (worker *Worker) removeAgent(a *agent) {
         worker.err(common.ErrNoActiveAgent)
     }
 }
+
+type result struct {
+    data []byte
+    err error
+}