Allow rapid socket reuse on POSIX platforms.

src/platform-posix.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 186 matching lines @@
 
 // ----------------------------------------------------------------------------
 // POSIX socket support.
 //
 
 class POSIXSocket : public Socket {
  public:
   explicit POSIXSocket() {
     // Create the socket.
     socket_ = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+    if (IsValid()) {
+      // Allow rapid reuse.
+      static const int kOn = 1;
+      int ret = setsockopt(socket_, SOL_SOCKET, SO_REUSEADDR,
+                           &kOn, sizeof(kOn));
+      ASSERT(ret == 0);
+      USE(ret);
+    }
   }
   explicit POSIXSocket(int socket): socket_(socket) { }
   virtual ~POSIXSocket() { Shutdown(); }
 
   // Server initialization.
   bool Bind(const int port);
   bool Listen(int backlog) const;
   Socket* Accept() const;
 
   // Client initialization.
@@ skipping 141 matching lines @@
   return ntohl(value);
 }
 
 
 Socket* OS::CreateSocket() {
   return new POSIXSocket();
 }
 
 
 } }  // namespace v8::internal