diff options
Diffstat (limited to 'util/oslib-win32.c')
| -rw-r--r-- | util/oslib-win32.c | 204 |
1 files changed, 0 insertions, 204 deletions
diff --git a/util/oslib-win32.c b/util/oslib-win32.c index 05e4ee5033..ca99356fdf 100644 --- a/util/oslib-win32.c +++ b/util/oslib-win32.c @@ -347,210 +347,6 @@ const char *qemu_get_exec_dir(void) return exec_dir; } -#if !GLIB_CHECK_VERSION(2, 50, 0) -/* - * The original implementation of g_poll from glib has a problem on Windows - * when using timeouts < 10 ms. - * - * Whenever g_poll is called with timeout < 10 ms, it does a quick poll instead - * of wait. This causes significant performance degradation of QEMU. - * - * The following code is a copy of the original code from glib/gpoll.c - * (glib commit 20f4d1820b8d4d0fc4447188e33efffd6d4a88d8 from 2014-02-19). - * Some debug code was removed and the code was reformatted. - * All other code modifications are marked with 'QEMU'. - */ - -/* - * gpoll.c: poll(2) abstraction - * Copyright 1998 Owen Taylor - * Copyright 2008 Red Hat, Inc. - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * This library 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 - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, see <http://www.gnu.org/licenses/>. - */ - -static int poll_rest(gboolean poll_msgs, HANDLE *handles, gint nhandles, - GPollFD *fds, guint nfds, gint timeout) -{ - DWORD ready; - GPollFD *f; - int recursed_result; - - if (poll_msgs) { - /* Wait for either messages or handles - * -> Use MsgWaitForMultipleObjectsEx - */ - ready = MsgWaitForMultipleObjectsEx(nhandles, handles, timeout, - QS_ALLINPUT, MWMO_ALERTABLE); - - if (ready == WAIT_FAILED) { - gchar *emsg = g_win32_error_message(GetLastError()); - g_warning("MsgWaitForMultipleObjectsEx failed: %s", emsg); - g_free(emsg); - } - } else if (nhandles == 0) { - /* No handles to wait for, just the timeout */ - if (timeout == INFINITE) { - ready = WAIT_FAILED; - } else { - SleepEx(timeout, TRUE); - ready = WAIT_TIMEOUT; - } - } else { - /* Wait for just handles - * -> Use WaitForMultipleObjectsEx - */ - ready = - WaitForMultipleObjectsEx(nhandles, handles, FALSE, timeout, TRUE); - if (ready == WAIT_FAILED) { - gchar *emsg = g_win32_error_message(GetLastError()); - g_warning("WaitForMultipleObjectsEx failed: %s", emsg); - g_free(emsg); - } - } - - if (ready == WAIT_FAILED) { - return -1; - } else if (ready == WAIT_TIMEOUT || ready == WAIT_IO_COMPLETION) { - return 0; - } else if (poll_msgs && ready == WAIT_OBJECT_0 + nhandles) { - for (f = fds; f < &fds[nfds]; ++f) { - if (f->fd == G_WIN32_MSG_HANDLE && f->events & G_IO_IN) { - f->revents |= G_IO_IN; - } - } - - /* If we have a timeout, or no handles to poll, be satisfied - * with just noticing we have messages waiting. - */ - if (timeout != 0 || nhandles == 0) { - return 1; - } - - /* If no timeout and handles to poll, recurse to poll them, - * too. - */ - recursed_result = poll_rest(FALSE, handles, nhandles, fds, nfds, 0); - return (recursed_result == -1) ? -1 : 1 + recursed_result; - } else if (/* QEMU: removed the following unneeded statement which causes - * a compiler warning: ready >= WAIT_OBJECT_0 && */ - ready < WAIT_OBJECT_0 + nhandles) { - for (f = fds; f < &fds[nfds]; ++f) { - if ((HANDLE) f->fd == handles[ready - WAIT_OBJECT_0]) { - f->revents = f->events; - } - } - - /* If no timeout and polling several handles, recurse to poll - * the rest of them. - */ - if (timeout == 0 && nhandles > 1) { - /* Remove the handle that fired */ - int i; - for (i = ready - WAIT_OBJECT_0 + 1; i < nhandles; i++) { - handles[i-1] = handles[i]; - } - nhandles--; - recursed_result = poll_rest(FALSE, handles, nhandles, fds, nfds, 0); - return (recursed_result == -1) ? -1 : 1 + recursed_result; - } - return 1; - } - - return 0; -} - -gint g_poll_fixed(GPollFD *fds, guint nfds, gint timeout) -{ - HANDLE handles[MAXIMUM_WAIT_OBJECTS]; - gboolean poll_msgs = FALSE; - GPollFD *f; - gint nhandles = 0; - int retval; - - for (f = fds; f < &fds[nfds]; ++f) { - if (f->fd == G_WIN32_MSG_HANDLE && (f->events & G_IO_IN)) { - poll_msgs = TRUE; - } else if (f->fd > 0) { - /* Don't add the same handle several times into the array, as - * docs say that is not allowed, even if it actually does seem - * to work. - */ - gint i; - - for (i = 0; i < nhandles; i++) { - if (handles[i] == (HANDLE) f->fd) { - break; - } - } - - if (i == nhandles) { - if (nhandles == MAXIMUM_WAIT_OBJECTS) { - g_warning("Too many handles to wait for!\n"); - break; - } else { - handles[nhandles++] = (HANDLE) f->fd; - } - } - } - } - - for (f = fds; f < &fds[nfds]; ++f) { - f->revents = 0; - } - - if (timeout == -1) { - timeout = INFINITE; - } - - /* Polling for several things? */ - if (nhandles > 1 || (nhandles > 0 && poll_msgs)) { - /* First check if one or several of them are immediately - * available - */ - retval = poll_rest(poll_msgs, handles, nhandles, fds, nfds, 0); - - /* If not, and we have a significant timeout, poll again with - * timeout then. Note that this will return indication for only - * one event, or only for messages. We ignore timeouts less than - * ten milliseconds as they are mostly pointless on Windows, the - * MsgWaitForMultipleObjectsEx() call will timeout right away - * anyway. - * - * Modification for QEMU: replaced timeout >= 10 by timeout > 0. - */ - if (retval == 0 && (timeout == INFINITE || timeout > 0)) { - retval = poll_rest(poll_msgs, handles, nhandles, - fds, nfds, timeout); - } - } else { - /* Just polling for one thing, so no need to check first if - * available immediately - */ - retval = poll_rest(poll_msgs, handles, nhandles, fds, nfds, timeout); - } - - if (retval == -1) { - for (f = fds; f < &fds[nfds]; ++f) { - f->revents = 0; - } - } - - return retval; -} -#endif - int getpagesize(void) { SYSTEM_INFO system_info; |