5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 2001 Pekka Riikonen
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
22 #include "silcincludes.h"
23 #includd "silcschedule_i.h"
25 /* Our "select()" for WIN32. This mimics the behaviour of select() system
26 call. It does not call the Winsock's select() though. Its functions
27 are derived from GLib's g_poll() and from some old Xemacs's sys_select().
29 This makes following assumptions, which I don't know whether they
32 o SILC_TASK_WRITE is ignored, if set this will return immediately.
33 o If all arguments except timeout are NULL then this will register
34 a timeout with SetTimer and will wait just for Windows messages
36 o MsgWaitForMultipleObjects is used to wait all kind of events, this
37 includes SOCKETs and Windows messages.
38 o All Windows messages are dispatched from this function.
39 o The Operating System has Winsock 2.
43 o http://msdn.microsoft.com/library/default.asp?
44 url=/library/en-us/winui/hh/winui/messques_77zk.asp
45 o http://msdn.microsoft.com/library/default.asp?
46 url=/library/en-us/winsock/hh/winsock/apistart_9g1e.asp
47 o http://msdn.microsoft.com/library/default.asp?
48 url=/library/en-us/dnmgmt/html/msdn_getpeek.asp
49 o http://developer.novell.com/support/winsock/doc/toc.htm
53 int silc_select(SilcScheduleFd fds, uint32 fds_count, struct timeval *timeout)
55 HANDLE handles[MAXIMUM_WAIT_OBJECTS];
56 DWORD ready, curtime, timeo;
60 for (i = 0; i < fds_count; i++) {
64 if (fds[i].events & SILC_TASK_READ)
65 handles[nhandles++] = (HANDLE)i;
67 if (fds[i].events & SILC_TASK_WRITE)
73 timeo = (timeout ? (timeout->tv_sec * 1000) + (timeout->tv_usec / 1000) :
76 /* If we have nothing to wait and timeout is set then register a timeout
77 and wait just for windows messages. */
78 if (nhandles == 0 && timeout) {
79 UINT timer = SetTimer(NULL, 0, timeo, NULL);
80 curtime = GetTickCount();
84 while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
85 if (msg.message == WM_TIMER) {
86 KillTimer(NULL, timer);
89 TranslateMessage(&msg);
90 DispatchMessage(&msg);
93 KillTimer(NULL, timer);
94 if (timeo != INFINITE) {
95 timeo -= GetTickCount() - curtime;
99 timer = SetTimer(NULL, 0, timeo, NULL);
104 curtime = GetTickCount();
105 ready = MsgWaitForMultipleObjects(nhandles, handles, FALSE, timeo,
108 if (ready == WAIT_FAILED) {
109 /* Wait failed with error */
110 SILC_LOG_WARNING(("WaitForMultipleObjects() failed"));
112 } else if (ready >= WAIT_ABANDONED_0 &&
113 ready < WAIT_ABANDONED_0 + nhandles) {
114 /* Signal abandoned */
115 SILC_LOG_WARNING(("WaitForMultipleObjects() failed (ABANDONED)"));
117 } else if (ready == WAIT_TIMEOUT) {
120 } else if (ready == WAIT_OBJECT_0 + nhandles) {
121 /* Windows messages. The MSDN online says that if the application
122 creates a window then its main loop (and we're assuming that
123 it is our SILC Scheduler) must handle the Windows messages, so do
124 it here as the MSDN suggests. */
125 while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
126 TranslateMessage(&msg);
127 DispatchMessage(&msg);
130 /* If timeout is set then we must update the timeout since we won't
131 return and we will give the wait another try. */
132 if (timeo != INFINITE) {
133 timeo -= GetTickCount() - curtime;
138 /* Give the wait another try */
140 } else if (ready >= WAIT_OBJECT_0 && ready < WAIT_OBJECT_0 + nhandles &&
142 /* Some other event, like SOCKET or something. */
144 /* Go through all fds even though only one was set. This is to avoid
145 starvation of high numbered fds. */
146 ready -= WAIT_OBJECT_0;
148 for (i = 0; i < fds_count; i++) {
152 if (fds[i].fd == (int)handles[ready]) {
153 fds[i].revents |= SILC_TASK_READ;
158 /* Check the status of the next handle and set its fd to the fd
159 set if data is available. */
160 while (++ready < fds_count)
161 if (WaitForSingleObject(handles[ready], 0) == WAIT_OBJECT_0)
163 } while (ready < fds_count);
173 /* Internal wakeup context. */
176 SilcTask wakeup_task;
179 SILC_TASK_CALLBACK(silc_schedule_wakeup_cb)
184 #endif /* SILC_THREADS */
186 /* Initializes the wakeup of the scheduler. In multi-threaded environment
187 the scheduler needs to be wakenup when tasks are added or removed from
188 the task queues. This will initialize the wakeup for the scheduler.
189 Any tasks that needs to be registered must be registered to the `queue'.
190 It is guaranteed that the scheduler will automatically free any
191 registered tasks in this queue. This is system specific routine. */
193 void *silc_schedule_wakeup_init(SilcSchedule schedule)
196 SilcWin32Wakeup wakeup;
198 wakeup = silc_calloc(1, sizeof(*wakeup));
200 wakeup->wakeup_sema = CreateSemaphore(NULL, 0, 100, NULL);
201 if (!wakeup->wakeup_sema) {
206 wakeup->wakeup_task =
207 silc_schedule_task_add(schedule, (int)wakeup->wakeup_sema,
208 silc_schedule_wakeup_cb, wakeup,
210 SILC_TASK_PRI_NORMAL);
211 if (!wakeup->wakeup_task) {
212 CloseHandle(wakeup->wakeup_sema);
217 return (void *)wakeup;
223 /* Uninitializes the system specific wakeup. */
225 void silc_schedule_wakeup_uninit(void *context)
228 SilcWin32Wakeup wakeup = (SilcWin32Wakeup)context;
233 CloseHandle(wakeup->wakeup_sema);
238 /* Wakes up the scheduler */
240 void silc_schedule_wakeup_internal(void *context)
243 SilcWin32Wakeup wakeup = (SilcWin32Wakeup)context;
248 ReleaseSemaphore(wakeup->wakeup_sema, 1, NULL);