Disable symbols visibility support for the Clang compiler.

[wxWidgets.git] / src / common / socket.cpp

diff --git a/src/common/socket.cpp b/src/common/socket.cpp
index 0bb79b219f3baa8b5aa621196c91a5a8cf0d2bfb..64803df7a4f527d76a9bfc4c280c64ed774b1dbd 100644 (file)
--- a/src/common/socket.cpp
+++ b/src/common/socket.cpp
@@ -7,7 +7,7 @@
 //             (C) 1999-2000, Guillermo Rodriguez Garcia
 //             (C) 2008 Vadim Zeitlin
 // RCS_ID:     $Id$
-// License:    wxWindows licence
+// Licence:    wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 // ==========================================================================
@@ -750,36 +750,48 @@ int wxSocketImpl::Write(const void *buffer, int size)
 // Initialization and shutdown
 // --------------------------------------------------------------------------
 
-// FIXME-MT: all this is MT-unsafe, of course, we should protect all accesses
-//           to m_countInit with a crit section
-size_t wxSocketBase::m_countInit = 0;
+namespace
+{
+
+// counts the number of calls to Initialize() minus the number of calls to
+// Shutdown(): we don't really need it any more but it was documented that
+// Shutdown() must be called the same number of times as Initialize() and using
+// a counter helps us to check it
+int gs_socketInitCount = 0;
+
+} // anonymous namespace
 
 bool wxSocketBase::IsInitialized()
 {
-    return m_countInit > 0;
+    wxASSERT_MSG( wxIsMainThread(), "unsafe to call from other threads" );
+
+    return gs_socketInitCount != 0;
 }
 
 bool wxSocketBase::Initialize()
 {
-    if ( !m_countInit++ )
+    wxCHECK_MSG( wxIsMainThread(), false,
+                 "must be called from the main thread" );
+
+    if ( !gs_socketInitCount )
     {
         wxSocketManager * const manager = wxSocketManager::Get();
         if ( !manager || !manager->OnInit() )
-        {
-            m_countInit--;
-
             return false;
-        }
     }
 
+    gs_socketInitCount++;
+
     return true;
 }
 
 void wxSocketBase::Shutdown()
 {
-    // we should be initialized
-    wxASSERT_MSG( m_countInit > 0, wxT("extra call to Shutdown()") );
-    if ( --m_countInit == 0 )
+    wxCHECK_RET( wxIsMainThread(), "must be called from the main thread" );
+
+    wxCHECK_RET( gs_socketInitCount > 0, "too many calls to Shutdown()" );
+
+    if ( !--gs_socketInitCount )
     {
         wxSocketManager * const manager = wxSocketManager::Get();
         wxCHECK_RET( manager, "should have a socket manager" );
@@ -821,13 +833,15 @@ void wxSocketBase::Init()
     m_eventmask    =
     m_eventsgot    = 0;
 
-    if ( !IsInitialized() )
+    // when we create the first socket in the main thread we initialize the
+    // OS-dependent socket stuff: notice that this means that the user code
+    // needs to call wxSocket::Initialize() itself if the first socket it
+    // creates is not created in the main thread
+    if ( wxIsMainThread() )
     {
-        // this Initialize() will be undone by wxSocketModule::OnExit(), all
-        // the other calls to it should be matched by a call to Shutdown()
-        if (!Initialize())
+        if ( !Initialize() )
         {
-            wxLogError("Cannot initialize wxSocketBase");
+            wxLogError(_("Cannot initialize sockets"));
         }
     }
 }
@@ -966,7 +980,11 @@ wxUint32 wxSocketBase::DoRead(void* buffer_, wxUint32 nbytes)
             {
                 // if we don't want to wait, just return immediately
                 if ( m_flags & wxSOCKET_NOWAIT )
+                {
+                    // this shouldn't be counted as an error in this case
+                    SetError(wxSOCKET_NOERROR);
                     break;
+                }
 
                 // otherwise wait until the socket becomes ready for reading or
                 // an error occurs on it
@@ -1095,6 +1113,9 @@ wxSocketBase& wxSocketBase::Peek(void* buffer, wxUint32 nbytes)
 {
     wxSocketReadGuard read(this);
 
+    // Peek() should never block
+    wxSocketWaitModeChanger changeFlags(this, wxSOCKET_NOWAIT);
+
     m_lcount = DoRead(buffer, nbytes);
 
     Pushback(buffer, m_lcount);
@@ -1355,8 +1376,11 @@ wxSocketBase::DoWait(long timeout, wxSocketEventFlags flags)
 {
     wxCHECK_MSG( m_impl, -1, "can't wait on invalid socket" );
 
-    // we're never going to become ready if we're not connected (any more)
-    if ( !m_connected && !m_establishing )
+    // we're never going to become ready in a TCP client if we're not connected
+    // any more (OTOH a server can call this to precisely wait for a connection
+    // so do wait for it in this case and UDP client is never "connected")
+    if ( !m_impl->IsServer() &&
+            m_impl->m_stream && !m_connected && !m_establishing )
         return -1;
 
     // This can be set to true from Interrupt() to exit this function a.s.a.p.
@@ -1770,8 +1794,7 @@ wxSocketServer::wxSocketServer(const wxSockAddress& addr,
 
     if (m_impl->CreateServer() != wxSOCKET_NOERROR)
     {
-        delete m_impl;
-        m_impl = NULL;
+        wxDELETE(m_impl);
 
         wxLogTrace( wxTRACE_Socket, wxT("*** CreateServer() failed") );
         return;
@@ -2011,8 +2034,7 @@ wxDatagramSocket::wxDatagramSocket( const wxSockAddress& addr,
 
     if ( m_impl->CreateUDP() != wxSOCKET_NOERROR )
     {
-        delete m_impl;
-        m_impl = NULL;
+        wxDELETE(m_impl);
         return;
     }
 
@@ -2079,4 +2101,9 @@ wxFORCE_LINK_MODULE( socketiohandler )
     wxFORCE_LINK_MODULE( mswsocket )
 #endif
 
+// and for OSXManagerSetter in the OS X one
+#ifdef __WXOSX__
+    wxFORCE_LINK_MODULE( osxsocket )
+#endif
+
 #endif // wxUSE_SOCKETS