+++ /dev/null
-/*
- Copyright (C) 2009 John Emmas
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
-*/
-
-#ifdef COMPILER_MSVC
-
-//#include <glib/gtimer.h>
-#include "pbd/msvc_pbd.h"
-
-#ifndef _DWORD_DEFINED
-#define _DWORD_DEFINED
-typedef unsigned long DWORD;
-#endif // !_DWORD_DEFINED
-
-/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- * *
- * Note that this entire strategy failed to work, at least for pipes. It turned *
- * out that Windows 'tell()' always returns 0 when used on a pipe. This strategy *
- * is now deprecated, having been replaced by a new pipe-like object, which I've *
- * called 'PBD::pipex'. This polling functionality is included here mostly so *
- * that Ardour will build and launch under Windows. However, any module that *
- * relies on polling a pipe will eventually need to use the new pipex object. *
- * This code will allow it to compile and link successfully, although it won't *
- * poll successfully at run time. Having said that, these functions might well *
- * work for ports and/or other machanisms that get represented by a file handle. *
- * *
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
-
-int poll_input (struct pollfd *fds, nfds_t nfds, int& elapsed_time, int timeout)
-{
-DWORD dwOldTickCount,
- dwNewTickCount = GetTickCount();
-bool input = false,
- error = false;
-int ret = 0;
-
- if (NULL != fds)
- {
- nfds_t loop;
- short ev_mask = (POLLOUT|POLLWRNORM|POLLWRBAND);
-
- errno = NO_ERROR;
-
- do
- {
- dwOldTickCount = dwNewTickCount;
-
- for (loop=0; loop<nfds; loop++)
- fds[loop].revents = 0;
-
- for (loop=0; (loop<nfds && !error); loop++)
- {
- if (!(fds[loop].events & ev_mask))
- {
- long pos = _tell(fds[loop].fd);
-
- if (0 > pos)
- {
- // An error occurred ('errno' should have been set by '_tell()')
- ret = (-1);
- fds[loop].revents = POLLERR;
- if (fds[loop].events & POLLRDNORM)
- fds[loop].revents |= POLLRDNORM;
- if (fds[loop].events & POLLRDBAND)
- fds[loop].revents |= POLLRDBAND;
- if (fds[loop].events & POLLPRI)
- fds[loop].revents |= POLLPRI;
-
- // Do we want to abort on error?
- if (fds[loop].events & POLLERR)
- error = true;
- }
- else if (pos > 0)
- {
- // Input characters were found for this fd
- ret += 1;
- if (fds[loop].events & POLLRDNORM)
- fds[loop].revents |= POLLRDNORM;
- if (fds[loop].events & POLLRDBAND)
- fds[loop].revents |= POLLRDBAND;
- if (fds[loop].events & POLLPRI)
- fds[loop].revents |= POLLPRI;
-
- // Do we want to abort on input?
- if ((fds[loop].events & POLLIN) ||
- (fds[loop].events & POLLPRI) ||
- (fds[loop].events & POLLRDNORM) ||
- (fds[loop].events & POLLRDBAND))
- input = true;
- }
- }
- }
-
- if (input)
- break;
-
- dwNewTickCount = GetTickCount();
- elapsed_time += (dwNewTickCount-dwOldTickCount);
- // Note that the above will wrap round if the user leaves
- // his computer powered up for more than about 50 days!
-
- // Sleep briefly because GetTickCount() only has an accuracy of 10mS
- Sleep(10); // For some reason 'g_usleep()' craps over everything here. Different 'C' runtimes???
-
- } while ((!error) && ((timeout == (-1)) || (elapsed_time < timeout)));
- }
- else
- {
- errno = ERROR_BAD_ARGUMENTS;
- ret = (-1);
- }
-
- return (ret);
-}
-
-int poll_output (struct pollfd *fds, nfds_t nfds, int& elapsed_time, int timeout)
-{
-int ret = 0; // This functionality is not yet implemented
-
- if (NULL != fds)
- {
- // Just flag whichever pollfd was specified for writing
- short ev_mask = (POLLOUT|POLLWRNORM|POLLWRBAND);
-
- errno = NO_ERROR;
- elapsed_time = 0;
-
- for (nfds_t loop=0; loop<nfds; loop++)
- {
- if (fds[loop].events & ev_mask)
- {
- fds[loop].revents = POLLNVAL;
- errno = ERROR_INVALID_ACCESS;
- ret = (-1);
- }
- }
- }
- else
- {
- errno = ERROR_BAD_ARGUMENTS;
- ret = (-1);
- }
-
- return (ret);
-}
-
-//***************************************************************
-//
-// poll()
-//
-// Emulates POSIX poll() using Win32 _tell().
-//
-// Returns:
-//
-// On Success: A positive integer indicating the total number
-// of file descriptors that were available for
-// writing or had data available for reading.
-// On Failure: -1 (the actual error is saved in 'errno').
-//
-LIBPBD_API int PBD_APICALLTYPE
-poll (struct pollfd *fds, nfds_t nfds, int timeout)
-{
-int elapsed_time = 0;
-int ret = (-1);
-
- // Note that this functionality is not fully implemented.
- // At the time of writing, Ardour seems only to poll on
- // read pipes. Therefore return an error if any write
- // pipe seems to have been specified or if too many file
- // descriptors were passed.
- short ev_mask = (POLLOUT|POLLWRNORM|POLLWRBAND);
-
- if ((nfds > OPEN_MAX) || (nfds > NPOLLFILE))
- {
- errno = ERROR_TOO_MANY_OPEN_FILES;
- }
- else
- {
- ret = 0;
-
- for (nfds_t loop=0; loop<nfds; loop++)
- {
- if (fds[loop].events & ev_mask)
- {
- ret = poll_output(fds, nfds, elapsed_time, timeout);
- break;
- }
- }
-
- if (0 == ret)
- {
- // Poll for input
- ret = poll_input(fds, nfds, elapsed_time, timeout);
- }
- }
-
- return (ret);
-}
-
-#endif //COMPILER_MSVC
projects / ardour.git / commitdiff