6395224: (so) SocketChannel writer blocked on large buffer is not preempted by close method (vista)

Reviewed-by: chegar

1 files changed, 8 insertions, 0 deletions

diff --git a/src/windows/native/sun/nio/ch/nio_util.h b/src/windows/native/sun/nio/ch/nio_util.h
index 9c7a6d958..963e93ef0 100644
--- a/src/windows/native/sun/nio/ch/nio_util.h
+++ b/src/windows/native/sun/nio/ch/nio_util.h
@@ -25,6 +25,14 @@
 
 #include "jni.h"
 
+/**
+ * The maximum buffer size for WSASend/WSARecv. Microsoft recommendation for
+ * blocking operations is to use buffers no larger than 64k. We need the
+ * maximum to be less than 128k to support asynchronous close on Windows
+ * Server 2003 and newer editions of Windows.
+ */
+#define MAX_BUFFER_SIZE             ((128*1024)-1)
+
 jint fdval(JNIEnv *env, jobject fdo);
 jlong handleval(JNIEnv *env, jobject fdo);
 jboolean isNT();