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 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)i;
70 if (fds[i].events & SILC_TASK_WRITE)
76 timeo = (timeout ? (timeout->tv_sec * 1000) + (timeout->tv_usec / 1000) :
79 /* If we have nothing to wait and timeout is set then register a timeout
80 and wait just for windows messages. */
81 if (nhandles == 0 && timeout) {
82 UINT timer = SetTimer(NULL, 0, timeo, NULL);
83 curtime = GetTickCount();
87 while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
88 if (msg.message == WM_TIMER) {
89 KillTimer(NULL, timer);
92 TranslateMessage(&msg);
93 DispatchMessage(&msg);
96 KillTimer(NULL, timer);
97 if (timeo != INFINITE) {
98 timeo -= GetTickCount() - curtime;
102 timer = SetTimer(NULL, 0, timeo, NULL);
107 curtime = GetTickCount();
108 ready = MsgWaitForMultipleObjects(nhandles, handles, FALSE, timeo,
111 if (ready == WAIT_FAILED) {
112 /* Wait failed with error */
113 SILC_LOG_WARNING(("WaitForMultipleObjects() failed"));
115 } else if (ready >= WAIT_ABANDONED_0 &&
116 ready < WAIT_ABANDONED_0 + nhandles) {
117 /* Signal abandoned */
118 SILC_LOG_WARNING(("WaitForMultipleObjects() failed (ABANDONED)"));
120 } else if (ready == WAIT_TIMEOUT) {
123 } else if (ready == WAIT_OBJECT_0 + nhandles) {
124 /* Windows messages. The MSDN online says that if the application
125 creates a window then its main loop (and we're assuming that
126 it is our SILC Scheduler) must handle the Windows messages, so do
127 it here as the MSDN suggests. */
128 while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
129 TranslateMessage(&msg);
130 DispatchMessage(&msg);
133 /* If timeout is set then we must update the timeout since we won't
134 return and we will give the wait another try. */
135 if (timeo != INFINITE) {
136 timeo -= GetTickCount() - curtime;
141 /* Give the wait another try */
143 } else if (ready >= WAIT_OBJECT_0 && ready < WAIT_OBJECT_0 + nhandles &&
145 /* Some other event, like SOCKET or something. */
147 /* Go through all fds even though only one was set. This is to avoid
148 starvation of high numbered fds. */
149 ready -= WAIT_OBJECT_0;
151 for (i = 0; i < fds_count; i++) {
155 if (fds[i].fd == (int)handles[ready]) {
156 fds[i].revents |= SILC_TASK_READ;
161 /* Check the status of the next handle and set its fd to the fd
162 set if data is available. */
163 while (++ready < fds_count)
164 if (WaitForSingleObject(handles[ready], 0) == WAIT_OBJECT_0)
166 } while (ready < fds_count);
176 /* Internal wakeup context. */
179 SilcTask wakeup_task;
182 SILC_TASK_CALLBACK(silc_schedule_wakeup_cb)
187 #endif /* SILC_THREADS */
189 /* Initializes the wakeup of the scheduler. In multi-threaded environment
190 the scheduler needs to be wakenup when tasks are added or removed from
191 the task queues. This will initialize the wakeup for the scheduler.
192 Any tasks that needs to be registered must be registered to the `queue'.
193 It is guaranteed that the scheduler will automatically free any
194 registered tasks in this queue. This is system specific routine. */
196 void *silc_schedule_wakeup_init(SilcSchedule schedule)
199 SilcWin32Wakeup wakeup;
201 wakeup = silc_calloc(1, sizeof(*wakeup));
203 wakeup->wakeup_sema = CreateSemaphore(NULL, 0, 100, NULL);
204 if (!wakeup->wakeup_sema) {
209 wakeup->wakeup_task =
210 silc_schedule_task_add(schedule, (int)wakeup->wakeup_sema,
211 silc_schedule_wakeup_cb, wakeup,
213 SILC_TASK_PRI_NORMAL);
214 if (!wakeup->wakeup_task) {
215 CloseHandle(wakeup->wakeup_sema);
220 return (void *)wakeup;
226 /* Uninitializes the system specific wakeup. */
228 void silc_schedule_wakeup_uninit(void *context)
231 SilcWin32Wakeup wakeup = (SilcWin32Wakeup)context;
236 CloseHandle(wakeup->wakeup_sema);
241 /* Wakes up the scheduler */
243 void silc_schedule_wakeup_internal(void *context)
246 SilcWin32Wakeup wakeup = (SilcWin32Wakeup)context;
251 ReleaseSemaphore(wakeup->wakeup_sema, 1, NULL);