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

///////////////////////////////////////////////////////////////////////////////
// Name:       sckint.cpp
// Purpose:    Socket internal classes
// Authors:    Guilhem Lavaux
// Created:    April 1999
// Updated:
// Copyright:  (C) 1999, 1998, 1997, Guilhem Lavaux
// RCS_ID:     $Id$
// License:    see wxWindows license
///////////////////////////////////////////////////////////////////////////////
#ifdef __GNUG__
#pragma implementation "sckint.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#if wxUSE_SOCKETS

#define WXSOCK_INTERNAL
#include <wx/object.h>
#include <wx/list.h>
#include <wx/socket.h>
#include <wx/thread.h>
#include <wx/sckint.h>

// IRIX requires bstring.h be included to use select()
#ifdef sgi
    #include <bstring.h>
#endif // IRIX

#ifndef __WXSTUBS__

#include <stdlib.h>
#include <string.h>
#include <ctype.h>

// -----------------------
// System specific headers
// -----------------------

#ifdef __WXMAC__
// in order to avoid problems with our c library and double definitions
#define close closesocket
#define ioctl ioctlsocket

#include <wx/mac/macsock.h>
#endif

#if defined(__WINDOWS__)
#include <winsock.h>
#endif // __WINDOWS__

#if defined(__UNIX__)

#ifdef VMS
#include <socket.h>
#else
#include <sys/socket.h>
#endif
#include <sys/ioctl.h>

#include <sys/time.h>
#include <unistd.h>

#ifdef sun
#include <sys/filio.h>
#endif

#endif // __UNIX__

#include <signal.h>
#include <errno.h>

#ifdef __VISUALC__
#include <io.h>
#endif

// Constants
#define READ_MASK wxSocketBase::REQ_READ | wxSocketBase::REQ_ACCEPT | wxSocketBase::REQ_LOST
#define WRITE_MASK wxSocketBase::REQ_WRITE | wxSocketBase::REQ_CONNECT

// --------------------------------------------------------------
// --------- SocketWaiter ---------------------------------------
// --------------------------------------------------------------

#if wxUSE_THREADS
SocketWaiter::SocketWaiter(wxSocketBase *socket,
				 wxSocketInternal *internal)
  : wxThread(), 
    m_socket(socket), m_internal(internal), m_fd(internal->GetFD())
{
}

SocketWaiter::~SocketWaiter()
{
}

void SocketWaiter::ProcessReadEvent()
{
  int ret;
  char c;

  m_internal->AcquireFD();
  ret = recv(m_fd, &c, 1, MSG_PEEK);
  m_internal->ReleaseFD();
  
  // We are a server => emit a EVT_ACCEPT event.
  if (ret == -1 && m_socket->GetType() == wxSocketBase::SOCK_SERVER) {
    m_socket->OnRequest(wxSocketBase::EVT_ACCEPT);
    return;
  }
  
  // Else, no error => there is something to be read else
  // we've lost the connection.
  if (ret > 0) {
    m_socket->OnRequest(wxSocketBase::EVT_READ);
  } else {
    m_socket->OnRequest(wxSocketBase::EVT_LOST);
    m_internal->ReleaseData();  // In that case, we mustn't forget to unlock the mutex.
    Exit(NULL);
  }
}

void SocketWaiter::ProcessWriteEvent()
{
  if (m_socket->IsConnected())
    m_socket->OnRequest(wxSocketBase::EVT_CONNECT);
  else
    m_socket->OnRequest(wxSocketBase::EVT_WRITE);
}

void *SocketWaiter::Entry()
{
  struct timeval tv;
  fd_set sockrd_set, sockwr_set;
  wxSocketEvent event;
  int ret;

  while (1) {
    // We won't wait.
    tv.tv_sec = 0;
    tv.tv_usec = 0;

    FD_ZERO(&sockrd_set);
    FD_ZERO(&sockwr_set);

    m_internal->AcquireData();

    if ((m_socket->NeededReq() & READ_MASK) != 0)
      FD_SET(m_fd, &sockrd_set);
    if ((m_socket->NeededReq() & WRITE_MASK) != 0)
      FD_SET(m_fd, &sockwr_set);

    m_internal->AcquireFD();
    ret = select(m_fd+1, &sockrd_set, &sockwr_set, NULL, &tv);
    m_internal->ReleaseFD();

    if (FD_ISSET(m_fd, &sockrd_set))
      ProcessReadEvent();

    if (FD_ISSET(m_fd, &sockwr_set))
      ProcessWriteEvent();

    m_internal->ReleaseData();

#if wxUSE_THREADS
#ifdef Yield
#undef Yield
#endif
#endif

   // We wait for 100 ms to prevent the CPU from burning.
   wxUsleep(100);

    // Check whether we should exit.
    if (TestDestroy())
      return NULL;
  }
  return NULL;
}

// --------------------------------------------------------------
// --------- SocketRequester ------------------------------------
// --------------------------------------------------------------

SocketRequester::SocketRequester(wxSocketBase *socket,
				 wxSocketInternal *internal)
  :
#if wxUSE_THREADS
    wxThread(),
#endif
    m_socket(socket), m_internal(internal), m_fd(internal->GetFD())
{
}

SocketRequester::~SocketRequester()
{
}

bool SocketRequester::WaitFor(wxSocketBase::wxRequestNotify req, int millisec)
{
  int ret;
  struct timeval tv;
  fd_set sockrd_set, sockwr_set;

  // We won't wait.
  tv.tv_sec = millisec / 1000;
  tv.tv_usec = (millisec % 1000) * 1000;

  FD_ZERO(&sockrd_set);
  FD_ZERO(&sockwr_set);
  if ((req & READ_MASK) != 0)  
    FD_SET(m_fd, &sockrd_set);
  if ((req & WRITE_MASK) != 0)
    FD_SET(m_fd, &sockwr_set);
  
  m_internal->AcquireFD();
  ret = select(m_fd+1, &sockrd_set, &sockwr_set, NULL, &tv);
  m_internal->ReleaseFD();

  return (ret != 0);
}

void SocketRequester::ProcessReadEvent(SockRequest *req)
{
  int ret;
  size_t len;

  // We'll wait for the first byte, in case a "timeout event" occurs it returns   // immediately
  if (!WaitFor(wxSocketBase::REQ_READ, req->timeout)) {
    m_internal->EndRequest(req);
    return;
  }

  m_internal->AcquireFD();
  ret = recv(m_fd, req->buffer, req->size,
	     (req->type == wxSocketBase::REQ_PEEK) ? MSG_PEEK : 0);
  m_internal->ReleaseFD();

  // An error occured, we exit.
  if (ret < 0) {
    req->error = errno;
    m_internal->EndRequest(req);
    return;
  }
  len = ret;

  // If the buffer isn't full (and we want it to be full), we don't unqueue it.
  if ((len < req->size) && (m_socket->GetFlags() & wxSocketBase::WAITALL)) {
    req->size -= len;
    req->io_nbytes += len;
    req->buffer += len;

    if (len == 0)
      m_internal->EndRequest(req); 
    return;
  }
  // The End.
  req->io_nbytes += len;
  m_internal->EndRequest(req);
}

void SocketRequester::ProcessWriteEvent(SockRequest *req)
{
  int ret;
  size_t len;

  if (!WaitFor(wxSocketBase::REQ_WRITE, req->timeout)) {
    m_internal->EndRequest(req);
    return;
  }

  m_internal->AcquireFD();
  ret = send(m_fd, req->buffer, req->size, 0);
  m_internal->ReleaseFD();
  if (ret < 0) {
    req->error = errno;
    m_internal->EndRequest(req);
    return;
  }
  len = ret;
  if ((len < req->size) && ((m_socket->GetFlags() & wxSocketBase::WAITALL) != 0)) {
    req->size -= len;
    req->io_nbytes += len;
    req->buffer += len;
    return;
  }
  req->io_nbytes += len;
  m_internal->EndRequest(req);
}

void SocketRequester::ProcessWaitEvent(SockRequest *req)
{
  if (WaitFor(req->type, req->timeout))
    req->io_nbytes = 1; // We put 1 in the counter to tell the requester
                        // there is no timeout.
  else
    req->io_nbytes = 0;

  m_internal->EndRequest(req);
}

void *SocketRequester::Entry()
{
  SockRequest *req;

  m_internal->m_request_locker.Lock();
  while (1) {
    // Wait for a new request or a destroy message.
    req = m_internal->WaitForReq();
    m_internal->m_end_requester.Lock();
    if (req == NULL) {
      m_internal->m_invalid_requester = TRUE;
      m_internal->m_end_requester.Unlock();
      m_internal->m_request_locker.Unlock();
      return NULL;
    }
    m_internal->m_end_requester.Unlock();

    if ((req->type & wxSocketBase::REQ_WAIT) != 0) {
      ProcessWaitEvent(req);
      continue;
    }

    switch (req->type) {
    case wxSocketBase::REQ_READ:
    case wxSocketBase::REQ_PEEK:
      ProcessReadEvent(req);
      break;
    case wxSocketBase::REQ_WRITE:
      ProcessWriteEvent(req);
      break;
    }
  }
  return NULL;
}
#endif

// --------------------------------------------------------------
// --------- wxSocketInternal -----------------------------------
// --------------------------------------------------------------

wxSocketInternal::wxSocketInternal(wxSocketBase *socket)
{
  m_socket = socket;
  m_thread_requester = NULL;
  m_thread_waiter = NULL;
  m_invalid_requester = TRUE;
}

wxSocketInternal::~wxSocketInternal()
{
  StopRequester();
  wxASSERT(m_thread_requester == NULL);
  StopWaiter();
  wxASSERT(m_thread_waiter == NULL);
}

// ----------------------------------------------------------------------
// WaitForReq: it is called by SocketRequester and should return the next
// socket request if available
// ----------------------------------------------------------------------
SockRequest *wxSocketInternal::WaitForReq()
{
#if wxUSE_THREADS
  wxNode *node;

  // First try.
  node = m_requests.First();
  if (node == NULL) {
    m_socket_cond.Wait(m_request_locker, 10, 0);

    // Second try, if it is unsuccessul we give up.
    node = m_requests.First();
    if (node == NULL)
      return NULL;
  }

  return (SockRequest *)node->Data();
#else
  return NULL;
#endif
}

// ----------------------------------------------------------------------
// EndRequest: Should be called to finalize a request
// ----------------------------------------------------------------------
void wxSocketInternal::EndRequest(SockRequest *req)
{
  wxNode *node = NULL;

  req->done = TRUE;

  node = m_requests.Member((wxObject *)req);
  if (node != NULL)
    delete node;
}

void wxSocketInternal::AcquireData()
{
#if wxUSE_THREADS
  m_socket_locker.Lock();
#endif
}

void wxSocketInternal::ReleaseData()
{
#if wxUSE_THREADS
  m_socket_locker.Unlock();
#endif
}

void wxSocketInternal::AcquireFD()
{
#if wxUSE_THREADS
  m_fd_locker.Lock();
#endif
}

void wxSocketInternal::ReleaseFD()
{
#if wxUSE_THREADS
  m_fd_locker.Unlock();
#endif
}

void wxSocketInternal::ResumeRequester()
{
#if wxUSE_THREADS
  wxThreadError err;

  wxASSERT(m_invalid_requester);

  m_end_requester.Lock();

  if (m_thread_requester != NULL) {
    m_thread_requester->Delete(); // We must join it.
    delete m_thread_requester;
  }

  m_invalid_requester = FALSE;

  m_end_requester.Unlock();

  m_thread_requester = new SocketRequester(m_socket, this);

  err = m_thread_requester->Create();
  wxASSERT(err == wxTHREAD_NO_ERROR);

  err = m_thread_requester->Run();
  wxASSERT(err == wxTHREAD_NO_ERROR);
#else
  if (!m_invalid_requester) 
    return;
  m_thread_requester = new SocketRequester(m_socket, this);
  m_invalid_requester = FALSE;
#endif
}

void wxSocketInternal::StopRequester()
{
#if wxUSE_THREADS
  m_end_requester.Lock();
  if (m_invalid_requester) {
    m_end_requester.Unlock();
    if (m_thread_requester) {
      m_thread_requester->Delete();
      delete m_thread_requester;
      m_thread_requester = NULL;
    }
    m_invalid_requester = TRUE;
    return;
  }
  m_end_requester.Unlock();

  wxASSERT(m_thread_requester != NULL);

  m_request_locker.Lock();

  // Send a signal to the requester.
  m_socket_cond.Signal();

  m_request_locker.Unlock();

  // Finish the destruction of the requester.
  m_thread_requester->Delete();

  delete m_thread_requester;
  m_thread_requester = NULL;
  m_invalid_requester = TRUE;
#else
  delete m_thread_requester;
  m_thread_requester = NULL;
  m_invalid_requester = TRUE;
#endif
}

void wxSocketInternal::ResumeWaiter()
{
#if wxUSE_THREADS
  wxThreadError err;

  if (m_thread_waiter != NULL)
    return;

  m_thread_waiter = new SocketWaiter(m_socket, this);

  m_thread_waiter->SetPriority(WXTHREAD_MIN_PRIORITY);

  err = m_thread_waiter->Create();
  wxASSERT(err == wxTHREAD_NO_ERROR);

  err = m_thread_waiter->Run();
  wxASSERT(err == wxTHREAD_NO_ERROR);
#endif
}

void wxSocketInternal::StopWaiter()
{
#if wxUSE_THREADS
  if (m_thread_waiter == NULL)
    return;

  m_thread_waiter->Delete();

  delete m_thread_waiter;
  m_thread_waiter = NULL;
#endif
}

// ----------------------------------------------------------------------
// QueueRequest:
// ----------------------------------------------------------------------
void wxSocketInternal::QueueRequest(SockRequest *request, bool async)
{
  if (m_invalid_requester)
    ResumeRequester();

#if wxUSE_THREADS
  if (async) {

    m_request_locker.Lock();
    request->done = FALSE;
    m_requests.Append((wxObject *)request);
    m_socket_cond.Signal();
    m_request_locker.Unlock();
    
    // Wake up
    
    if (request->wait) {
      if (wxThread::IsMain())
        while (!request->done) {
	  wxYield();
        }
      else
        while (!request->done) {
          wxThread::Yield();
        }
    }
  } else {
    m_request_locker.Lock();
#endif

    if ((request->type & wxSocketBase::REQ_WAIT) != 0) {
      m_thread_requester->ProcessWaitEvent(request);
    } else {

      request->done = FALSE;

      switch (request->type) {
      case wxSocketBase::REQ_PEEK:
      case wxSocketBase::REQ_READ:
        m_thread_requester->ProcessReadEvent(request);
        break;
      case wxSocketBase::REQ_WRITE:
        m_thread_requester->ProcessWriteEvent(request);
        break;
      }
    }
    request->done = TRUE;
#if wxUSE_THREADS
    m_request_locker.Unlock();
  }
#endif
}

void wxSocketInternal::WaitForEnd(SockRequest *request)
{
#if wxUSE_THREADS
  // TODOTODO
#endif
}

#endif
  // __WXSTUBS__

#endif
  // wxUSE_SOCKETS