5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 2001 - 2005 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; version 2 of the License.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
21 #include "silcincludes.h"
22 #include "silcschedule_i.h"
24 /* Our "select()" for WIN32. This mimics the behaviour of select() system
25 call. It does not call the Winsock's select() though. Its functions
26 are derived from GLib's g_poll() and from some old Xemacs's sys_select().
28 This makes following assumptions, which I don't know whether they
31 o SILC_TASK_WRITE is ignored, if set this will return immediately.
32 o If all arguments except timeout are NULL then this will register
33 a timeout with SetTimer and will wait just for Windows messages
35 o MsgWaitForMultipleObjects is used to wait all kind of events, this
36 includes SOCKETs and Windows messages.
37 o All Windows messages are dispatched from this function.
38 o The Operating System has Winsock 2.
42 o http://msdn.microsoft.com/library/default.asp?
43 url=/library/en-us/winui/hh/winui/messques_77zk.asp
44 o http://msdn.microsoft.com/library/default.asp?
45 url=/library/en-us/winsock/hh/winsock/apistart_9g1e.asp
46 o http://msdn.microsoft.com/library/default.asp?
47 url=/library/en-us/dnmgmt/html/msdn_getpeek.asp
48 o http://developer.novell.com/support/winsock/doc/toc.htm
52 int silc_select(SilcScheduleFd fds, SilcUInt32 fds_count, struct timeval *timeout)
54 HANDLE handles[MAXIMUM_WAIT_OBJECTS];
60 if (fds_count > MAXIMUM_WAIT_OBJECTS)
61 fds_count = MAXIMUM_WAIT_OBJECTS;
63 for (i = 0; i < fds_count; i++) {
67 if (fds[i].events & SILC_TASK_READ)
68 handles[nhandles++] = (HANDLE)fds[i].fd;
70 /* If writing then just set the bit and return */
71 if (fds[i].events & SILC_TASK_WRITE) {
72 fds[i].revents = SILC_TASK_WRITE;
79 timeo = (timeout ? (timeout->tv_sec * 1000) + (timeout->tv_usec / 1000) :
82 /* If we have nothing to wait and timeout is set then register a timeout
83 and wait just for windows messages. */
84 if (nhandles == 0 && timeout) {
85 UINT timer = SetTimer(NULL, 0, timeo, NULL);
86 curtime = GetTickCount();
90 while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
91 if (msg.message == WM_TIMER) {
92 KillTimer(NULL, timer);
95 TranslateMessage(&msg);
96 DispatchMessage(&msg);
99 KillTimer(NULL, timer);
100 if (timeo != INFINITE) {
101 timeo -= GetTickCount() - curtime;
102 curtime = GetTickCount();
106 timer = SetTimer(NULL, 0, timeo, NULL);
111 curtime = GetTickCount();
112 ready = MsgWaitForMultipleObjects(nhandles, handles, FALSE, timeo,
115 if (ready == WAIT_FAILED) {
116 /* Wait failed with error */
117 SILC_LOG_WARNING(("WaitForMultipleObjects() failed"));
119 } else if (ready >= WAIT_ABANDONED_0 &&
120 ready < WAIT_ABANDONED_0 + nhandles) {
121 /* Signal abandoned */
122 SILC_LOG_WARNING(("WaitForMultipleObjects() failed (ABANDONED)"));
124 } else if (ready == WAIT_TIMEOUT) {
127 } else if (ready == WAIT_OBJECT_0 + nhandles) {
128 /* Windows messages. The MSDN online says that if the application
129 creates a window then its main loop (and we're assuming that
130 it is our SILC Scheduler) must handle the Windows messages, so do
131 it here as the MSDN suggests. */
132 while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
133 TranslateMessage(&msg);
134 DispatchMessage(&msg);
137 /* If timeout is set then we must update the timeout since we won't
138 return and we will give the wait another try. */
139 if (timeo != INFINITE) {
140 timeo -= GetTickCount() - curtime;
141 curtime = GetTickCount();
146 /* Give the wait another try */
148 } else if (ready >= WAIT_OBJECT_0 && ready < WAIT_OBJECT_0 + nhandles) {
149 /* Some other event, like SOCKET or something. */
151 /* Go through all fds even though only one was set. This is to avoid
152 starvation of high numbered fds. */
153 ready -= WAIT_OBJECT_0;
155 for (i = 0; i < fds_count; i++) {
159 if (fds[i].fd == (int)handles[ready]) {
160 fds[i].revents |= SILC_TASK_READ;
165 /* Check the status of the next handle and set its fd to the fd
166 set if data is available. */
167 while (++ready < fds_count)
168 if (WaitForSingleObject(handles[ready], 0) == WAIT_OBJECT_0)
170 } while (ready < fds_count);
180 /* Internal wakeup context. */
183 SilcTask wakeup_task;
186 SILC_TASK_CALLBACK(silc_schedule_wakeup_cb)
191 #endif /* SILC_THREADS */
193 /* Initializes the platform specific scheduler. This for example initializes
194 the wakeup mechanism of the scheduler. In multi-threaded environment
195 the scheduler needs to be wakenup when tasks are added or removed from
196 the task queues. Returns context to the platform specific scheduler. */
198 void *silc_schedule_internal_init(SilcSchedule schedule, void *app_context)
201 SilcWin32Wakeup wakeup;
203 wakeup = silc_calloc(1, sizeof(*wakeup));
205 wakeup->wakeup_sema = CreateSemaphore(NULL, 0, 100, NULL);
206 if (!wakeup->wakeup_sema) {
211 wakeup->wakeup_task =
212 silc_schedule_task_add(schedule, (int)wakeup->wakeup_sema,
213 silc_schedule_wakeup_cb, wakeup,
215 SILC_TASK_PRI_NORMAL);
216 if (!wakeup->wakeup_task) {
217 CloseHandle(wakeup->wakeup_sema);
222 return (void *)wakeup;
228 /* Uninitializes the platform specific scheduler context. */
230 void silc_schedule_internal_uninit(void *context)
233 SilcWin32Wakeup wakeup = (SilcWin32Wakeup)context;
238 CloseHandle(wakeup->wakeup_sema);
243 /* Wakes up the scheduler */
245 void silc_schedule_internal_wakeup(void *context)
248 SilcWin32Wakeup wakeup = (SilcWin32Wakeup)context;
253 ReleaseSemaphore(wakeup->wakeup_sema, 1, NULL);
257 /* Register signal */
259 void silc_schedule_internal_signal_register(void *context,
261 SilcTaskCallback callback,
262 void *callback_context)
267 /* Unregister signal */
269 void silc_schedule_internal_signal_unregister(void *context,
271 SilcTaskCallback callback,
272 void *callback_context)
277 /* Mark signal to be called later. */
279 void silc_schedule_internal_signal_call(void *context, SilcUInt32 signal)
284 /* Call all signals */
286 void silc_schedule_internal_signals_call(void *context,
287 SilcSchedule schedule)
292 /* Block registered signals in scheduler. */
294 void silc_schedule_internal_signals_block(void *context)
299 /* Unblock registered signals in schedule. */
301 void silc_schedule_internal_signals_unblock(void *context)