X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/02d15cad1148ebb91f09f71fe0d9bd66be2935cc..9548c49a6a1e4533976450205de136d9edbe91b0:/src/common/socket.cpp

diff --git a/src/common/socket.cpp b/src/common/socket.cpp
index a38097d124..2848d09a9a 100644
--- a/src/common/socket.cpp
+++ b/src/common/socket.cpp
@@ -51,12 +51,32 @@
 // discard buffer
 #define MAX_DISCARD_SIZE (10 * 1024)
 
-// what to do within waits
+// what to do within waits: in wxBase we don't do anything as we don't have
+// the event loop anyhow (for now). In GUI apps we have 2 cases: from the main
+// thread itself we have to call wxYield() to let the events (including the
+// GUI events and the low-level (not wxWindows) events from GSocket) be
+// processed. From another thread it is enough to just call wxThread::Yield()
+// which will give away the rest of our time slice: the explanation is that
+// the events will be processed by the main thread anyhow, without calling
+// wxYield(), but we don't want to eat the CPU time uselessly while sitting
+// in the loop waiting for the data
 #if wxUSE_GUI
-  #define PROCESS_EVENTS() wxYield()
-#else
-  #define PROCESS_EVENTS()
-#endif
+    #if wxUSE_THREADS
+        #define PROCESS_EVENTS()        \
+        {                               \
+            if ( wxThread::IsMain() )   \
+                wxYield();              \
+            else                        \
+                wxThread::Yield();      \
+        }
+    #else // !wxUSE_THREADS
+        #define PROCESS_EVENTS() wxYield()
+    #endif // wxUSE_THREADS/!wxUSE_THREADS
+#else // !wxUSE_GUI
+    #define PROCESS_EVENTS()
+#endif // wxUSE_GUI/!wxUSE_GUI
+
+#define wxTRACE_Socket _T("wxSocket")
 
 // --------------------------------------------------------------------------
 // wxWin macros
@@ -92,6 +112,44 @@ public:
 // wxSocketBase
 // ==========================================================================
 
+// --------------------------------------------------------------------------
+// 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;
+
+bool wxSocketBase::IsInitialized()
+{
+    return m_countInit > 0;
+}
+
+bool wxSocketBase::Initialize()
+{
+    if ( !m_countInit++ )
+    {
+        if ( !GSocket_Init() )
+        {
+            m_countInit--;
+
+            return FALSE;
+        }
+    }
+
+    return TRUE;
+}
+
+void wxSocketBase::Shutdown()
+{
+    // we should be initialized
+    wxASSERT_MSG( m_countInit, _T("extra call to Shutdown()") );
+    if ( !--m_countInit )
+    {
+        GSocket_Cleanup();
+    }
+}
+
 // --------------------------------------------------------------------------
 // Ctor and dtor
 // --------------------------------------------------------------------------
@@ -127,6 +185,13 @@ void wxSocketBase::Init()
   m_cbk          = NULL;
   m_cdata        = NULL;
 #endif // WXWIN_COMPATIBILITY
+
+  if ( !IsInitialized() )
+  {
+      // this Initialize() will be undone by wxSocketModule::OnExit(), all the
+      // other calls to it should be matched by a call to Shutdown()
+      Initialize();
+  }
 }
 
 wxSocketBase::wxSocketBase()
@@ -244,32 +309,38 @@ wxUint32 wxSocketBase::_Read(void* buffer, wxUint32 nbytes)
   nbytes -= total;
   buffer  = (char *)buffer + total;
 
-  // If the socket is invalid or we got all the data, return now
-  if (!m_socket || !nbytes)
+  // Return now in one of the following cases:
+  // - the socket is invalid,
+  // - we got all the data,
+  // - we got *some* data and we are not using wxSOCKET_WAITALL.
+  if ( !m_socket ||
+       !nbytes ||
+       ((total != 0) && !(m_flags & wxSOCKET_WAITALL)) )
     return total;
 
   // Possible combinations (they are checked in this order)
   // wxSOCKET_NOWAIT
-  // wxSOCKET_WAITALL | wxSOCKET_BLOCK
-  // wxSOCKET_WAITALL
+  // wxSOCKET_WAITALL (with or without wxSOCKET_BLOCK)
   // wxSOCKET_BLOCK
   // wxSOCKET_NONE
   //
   if (m_flags & wxSOCKET_NOWAIT)
   {
-    GSocket_SetNonBlocking(m_socket, TRUE);
+    GSocket_SetNonBlocking(m_socket, 1);
     ret = GSocket_Read(m_socket, (char *)buffer, nbytes);
-    GSocket_SetNonBlocking(m_socket, FALSE);
+    GSocket_SetNonBlocking(m_socket, 0);
 
     if (ret > 0)
       total += ret;
   }
-  else if (m_flags & wxSOCKET_WAITALL)
+  else
   {
-    while (ret > 0 && nbytes > 0)
+    bool more = TRUE;
+
+    while (more)
     {
-      if (!(m_flags & wxSOCKET_BLOCK) && !WaitForRead())
-          break;
+      if ( !(m_flags & wxSOCKET_BLOCK) && !WaitForRead() )
+        break;
 
       ret = GSocket_Read(m_socket, (char *)buffer, nbytes);
 
@@ -279,16 +350,12 @@ wxUint32 wxSocketBase::_Read(void* buffer, wxUint32 nbytes)
         nbytes -= ret;
         buffer  = (char *)buffer + ret;
       }
-    }
-  }
-  else
-  {
-    if ((m_flags & wxSOCKET_BLOCK) || WaitForRead())
-    {
-      ret = GSocket_Read(m_socket, (char *)buffer, nbytes);
 
-      if (ret > 0)
-        total += ret;
+      // If we got here and wxSOCKET_WAITALL is not set, we can leave
+      // now. Otherwise, wait until we recv all the data or until there
+      // is an error.
+      //
+      more = (ret > 0 && nbytes > 0 && (m_flags & wxSOCKET_WAITALL));
     }
   }
 
@@ -324,7 +391,7 @@ wxSocketBase& wxSocketBase::ReadMsg(void* buffer, wxUint32 nbytes)
 
   if (sig != 0xfeeddead)
   {
-    wxLogWarning( _("wxSocket: invalid signature in ReadMsg."));
+    wxLogWarning(_("wxSocket: invalid signature in ReadMsg."));
     goto exit;
   }
 
@@ -378,7 +445,7 @@ wxSocketBase& wxSocketBase::ReadMsg(void* buffer, wxUint32 nbytes)
 
   if (sig != 0xdeadfeed)
   {
-    wxLogWarning( _("wxSocket: invalid signature in ReadMsg."));
+    wxLogWarning(_("wxSocket: invalid signature in ReadMsg."));
     goto exit;
   }
 
@@ -438,32 +505,33 @@ wxUint32 wxSocketBase::_Write(const void *buffer, wxUint32 nbytes)
   wxUint32 total = 0;
   int ret = 1;
 
-  // If the socket is invalid, return immediately
-  if (!m_socket)
+  // If the socket is invalid or parameters are ill, return immediately
+  if (!m_socket || !buffer || !nbytes)
     return 0;
 
   // Possible combinations (they are checked in this order)
   // wxSOCKET_NOWAIT
-  // wxSOCKET_WAITALL | wxSOCKET_BLOCK
-  // wxSOCKET_WAITALL
+  // wxSOCKET_WAITALL (with or without wxSOCKET_BLOCK)
   // wxSOCKET_BLOCK
   // wxSOCKET_NONE
   //
   if (m_flags & wxSOCKET_NOWAIT)
   {
-    GSocket_SetNonBlocking(m_socket, TRUE);
+    GSocket_SetNonBlocking(m_socket, 1);
     ret = GSocket_Write(m_socket, (const char *)buffer, nbytes);
-    GSocket_SetNonBlocking(m_socket, FALSE);
+    GSocket_SetNonBlocking(m_socket, 0);
 
     if (ret > 0)
       total = ret;
   }
-  else if (m_flags & wxSOCKET_WAITALL)
+  else
   {
-    while (ret > 0 && nbytes > 0)
+    bool more = TRUE;
+
+    while (more)
     {
-      if (!(m_flags & wxSOCKET_BLOCK) && !WaitForWrite())
-          break;
+      if ( !(m_flags & wxSOCKET_BLOCK) && !WaitForWrite() )
+        break;
 
       ret = GSocket_Write(m_socket, (const char *)buffer, nbytes);
 
@@ -473,16 +541,12 @@ wxUint32 wxSocketBase::_Write(const void *buffer, wxUint32 nbytes)
         nbytes -= ret;
         buffer  = (const char *)buffer + ret;
       }
-    }
-  }
-  else
-  {
-    if ((m_flags & wxSOCKET_BLOCK) || WaitForWrite())
-    {
-      ret = GSocket_Write(m_socket, (const char *)buffer, nbytes);
 
-      if (ret > 0)
-        total = ret;
+      // If we got here and wxSOCKET_WAITALL is not set, we can leave
+      // now. Otherwise, wait until we send all the data or until there
+      // is an error.
+      //
+      more = (ret > 0 && nbytes > 0 && (m_flags & wxSOCKET_WAITALL));
     }
   }
 
@@ -653,7 +717,7 @@ bool wxSocketBase::_Wait(long seconds,
     {
       m_connected = FALSE;
       m_establishing = FALSE;
-      return (flags & GSOCK_LOST_FLAG);
+      return (flags & GSOCK_LOST_FLAG) != 0;
     }
 
     // Wait more?
@@ -715,6 +779,12 @@ bool wxSocketBase::GetPeer(wxSockAddress& addr_man) const
     return FALSE;
 
   peer = GSocket_GetPeer(m_socket);
+
+    // copying a null address would just trigger an assert anyway
+
+  if (!peer)
+    return FALSE;
+
   addr_man.SetAddress(peer);
   GAddress_destroy(peer);
 
@@ -845,9 +915,10 @@ char *wxSocketBase::CallbackData(char *data)
 // decoupled from wx_socket_callback and thus they suffer from a variety
 // of problems. Avoid them where possible and use events instead.
 
-static void LINKAGEMODE wx_socket_callback(GSocket * WXUNUSED(socket),
-                                           GSocketEvent notification,
-                                           char *cdata)
+extern "C"
+void LINKAGEMODE wx_socket_callback(GSocket * WXUNUSED(socket),
+                                    GSocketEvent notification,
+                                    char *cdata)
 {
   wxSocketBase *sckobj = (wxSocketBase *)cdata;
 
@@ -893,13 +964,16 @@ void wxSocketBase::OnRequest(wxSocketNotify notification)
 
   // Schedule the event
 
-  wxSocketEventFlags flag = -1;
+  wxSocketEventFlags flag = 0;
   switch (notification)
   {
     case GSOCK_INPUT:      flag = GSOCK_INPUT_FLAG; break;
     case GSOCK_OUTPUT:     flag = GSOCK_OUTPUT_FLAG; break;
     case GSOCK_CONNECTION: flag = GSOCK_CONNECTION_FLAG; break;
     case GSOCK_LOST:       flag = GSOCK_LOST_FLAG; break;
+    default:
+      wxLogWarning(_("wxSocket: unknown event!."));
+      return;
   }
 
   if (((m_eventmask & flag) == flag) && m_notify)
@@ -990,7 +1064,7 @@ wxUint32 wxSocketBase::GetPushback(void *buffer, wxUint32 size, bool peek)
 
 
 // ==========================================================================
-// wxSocketServer                             
+// wxSocketServer
 // ==========================================================================
 
 // --------------------------------------------------------------------------
@@ -1001,26 +1075,32 @@ wxSocketServer::wxSocketServer(wxSockAddress& addr_man,
                                wxSocketFlags flags)
               : wxSocketBase(flags, wxSOCKET_SERVER)
 {
-  // Create the socket
-  m_socket = GSocket_new();
+    wxLogTrace( wxTRACE_Socket, _T("Opening wxSocketServer") );
 
-  if (!m_socket)
-    return;
+    m_socket = GSocket_new();
 
-  // Setup the socket as server
-  GSocket_SetLocal(m_socket, addr_man.GetAddress());
-  if (GSocket_SetServer(m_socket) != GSOCK_NOERROR)
-  {
-    GSocket_destroy(m_socket);
-    m_socket = NULL;
-    return;
-  }
+    if (!m_socket)
+    {
+        wxLogTrace( wxTRACE_Socket, _T("*** GSocket_new failed") );
+        return;
+    }
 
-  GSocket_SetTimeout(m_socket, m_timeout * 1000);
-  GSocket_SetCallback(m_socket, GSOCK_INPUT_FLAG | GSOCK_OUTPUT_FLAG |
-                                GSOCK_LOST_FLAG | GSOCK_CONNECTION_FLAG,
-                                wx_socket_callback, (char *)this);
+        // Setup the socket as server
+
+    GSocket_SetLocal(m_socket, addr_man.GetAddress());
+    if (GSocket_SetServer(m_socket) != GSOCK_NOERROR)
+    {
+        GSocket_destroy(m_socket);
+        m_socket = NULL;
+
+        wxLogTrace( wxTRACE_Socket, _T("*** GSocket_SetServer failed") );
+        return;
+    }
 
+    GSocket_SetTimeout(m_socket, m_timeout * 1000);
+    GSocket_SetCallback(m_socket, GSOCK_INPUT_FLAG | GSOCK_OUTPUT_FLAG |
+                                  GSOCK_LOST_FLAG | GSOCK_CONNECTION_FLAG,
+                                  wx_socket_callback, (char *)this);
 }
 
 // --------------------------------------------------------------------------
@@ -1039,12 +1119,12 @@ bool wxSocketServer::AcceptWith(wxSocketBase& sock, bool wait)
   // again.
 
   if (!wait)
-    GSocket_SetNonBlocking(m_socket, TRUE);
+    GSocket_SetNonBlocking(m_socket, 1);
 
   child_socket = GSocket_WaitConnection(m_socket);
 
   if (!wait)
-    GSocket_SetNonBlocking(m_socket, FALSE);
+    GSocket_SetNonBlocking(m_socket, 0);
 
   if (!child_socket)
     return FALSE;
@@ -1068,7 +1148,10 @@ wxSocketBase *wxSocketServer::Accept(bool wait)
   sock->SetFlags(m_flags);
 
   if (!AcceptWith(*sock, wait))
-    return NULL;
+  {
+    sock->Destroy();
+    sock = NULL;
+  }
 
   return sock;
 }
@@ -1127,13 +1210,13 @@ bool wxSocketClient::Connect(wxSockAddress& addr_man, bool wait)
   // again.
 
   if (!wait)
-    GSocket_SetNonBlocking(m_socket, TRUE);
+    GSocket_SetNonBlocking(m_socket, 1);
 
   GSocket_SetPeer(m_socket, addr_man.GetAddress());
   err = GSocket_Connect(m_socket, GSOCK_STREAMED);
 
   if (!wait)
-    GSocket_SetNonBlocking(m_socket, FALSE);
+    GSocket_SetNonBlocking(m_socket, 0);
 
   if (err != GSOCK_NOERROR)
   {
@@ -1212,39 +1295,32 @@ wxDatagramSocket& wxDatagramSocket::SendTo( wxSockAddress& addr,
     return (*this);
 }
 
-// ==========================================================================
-// wxSocketEvent
-// ==========================================================================
-
-wxSocketEvent::wxSocketEvent(int id) : wxEvent(id)
-{
-  SetEventType( (wxEventType)wxEVT_SOCKET );
-}
-
-void wxSocketEvent::CopyObject(wxObject& object_dest) const
-{
-  wxSocketEvent *event = (wxSocketEvent *)&object_dest;
-
-  wxEvent::CopyObject(object_dest);
-
-  event->m_event      = m_event;
-  event->m_clientData = m_clientData;
-}
-
 // ==========================================================================
 // wxSocketModule
 // ==========================================================================
 
 class WXDLLEXPORT wxSocketModule : public wxModule
 {
-  DECLARE_DYNAMIC_CLASS(wxSocketModule)
-
 public:
-  bool OnInit() { return GSocket_Init(); }
-  void OnExit() { GSocket_Cleanup(); }
+    virtual bool OnInit()
+    {
+        // wxSocketBase will call GSocket_Init() itself when/if needed
+        return TRUE;
+    }
+
+    virtual void OnExit()
+    {
+        if ( wxSocketBase::IsInitialized() )
+            wxSocketBase::Shutdown();
+    }
+
+private:
+    DECLARE_DYNAMIC_CLASS(wxSocketModule)
 };
 
 IMPLEMENT_DYNAMIC_CLASS(wxSocketModule, wxModule)
 
 #endif
   // wxUSE_SOCKETS
+
+// vi:sts=4:sw=4:et