NBSendResult has setStopAtEdge() now

gsock.cpp

@@ -456,6 +456,11 @@ struct NBSendResult::_impl
 	int total;
 	int done;
 
+	// When work together with epoll at ET mode, 
+	//   setting this flag can avoid infinite EAGAIN send loop. 
+	//   (caused by buffer full or something else)
+	bool stopAtEdge;
+
 	// 0: Not started.
 	// 1: Data is being sent
 	// 2: Data sent without error.
@@ -495,9 +500,16 @@ void NBSendResult::_impl::update()
 		errcode = err;
 
 		if (err == gerrno::WouldBlock)
+		{
+			if (stopAtEdge)
+			{
+				status = 2;
+			}
+			else
 			{
 				status = 1;
 			}
+		}
 		else
 		{
 			status = 3;
@@ -512,6 +524,11 @@ NBSendResult::NBSendResult() : _p(new _impl)
 	_p->status = 0;
 }
 
+void NBSendResult::setStopAtEdge(bool flag)
+{
+	_p->stopAtEdge = true;
+}
+
 bool NBSendResult::isFinished()
 {
 	_p->update();

gsock.h

@@ -94,6 +94,8 @@ class NBSendResult
 public:
 	NBSendResult();
 
+	void setStopAtEdge(bool flag);
+
 	// Is the operation finished.
 	bool isFinished();