X-Git-Url: http://git.silcnet.org/gitweb/?a=blobdiff_plain;f=lib%2Fsilcutil%2Fwin32%2Fsilcwin32schedule.c;h=c3dedee37270ebcd574a59be92023d798fafed3e;hb=c257b555225193e54d85daf541d29578b3c93882;hp=d87681dbee51a8d86ee08590378c34b8cb1e4ce6;hpb=377ac1cec4ace380054fd234babb6eefeab04a91;p=silc.git diff --git a/lib/silcutil/win32/silcwin32schedule.c b/lib/silcutil/win32/silcwin32schedule.c index d87681db..c3dedee3 100644 --- a/lib/silcutil/win32/silcwin32schedule.c +++ b/lib/silcutil/win32/silcwin32schedule.c @@ -20,96 +20,286 @@ /* $Id$ */ #include "silcincludes.h" +#include "silcschedule_i.h" -/* XXX This probably does not work at all the way we want. We mostly - need the scheduler to handle socket connections. The MSDN says the - WaitForMultipleObjects should not be used for sockets. Instead they - should be handled through windows messages (Like WSAAsyncSelect) but - that would require some different approach to this whole thing. Also, - I don't know whether I could use the Winsock's select()?? Maybe it would - be possible to use select(), WaitForMultipleObjects and handle the - windows messages with the PeekMessage() etc... Dunno... Someone who - knows these things should take a look at this. Also, If it requires - some more tweaking I can abandon this silc_select() thingy all together - and move the generic code to unix/ and program the SILC Scheduler - interface all together as platform specific. It is here just to - use as match common code as possible... -Pekka */ - -/* Our "select()" for WIN32. This actually is not the select() and does - not call Winsock's select() (since it cannot be used for our purposes) - but mimics the functions of select(). - - This is taken from the GLib and is the g_poll function in the Glib. - It has been *heavily* modified to be select() like and fit for SILC. */ - -int silc_select(int n, fd_set *readfds, fd_set *writefds, - fd_set *exceptfds, struct timeval *timeout) +/* Our "select()" for WIN32. This mimics the behaviour of select() system + call. It does not call the Winsock's select() though. Its functions + are derived from GLib's g_poll() and from some old Xemacs's sys_select(). + + This makes following assumptions, which I don't know whether they + are correct or not: + + o SILC_TASK_WRITE is ignored, if set this will return immediately. + o If all arguments except timeout are NULL then this will register + a timeout with SetTimer and will wait just for Windows messages + with WaitMessage. + o MsgWaitForMultipleObjects is used to wait all kind of events, this + includes SOCKETs and Windows messages. + o All Windows messages are dispatched from this function. + o The Operating System has Winsock 2. + + References: + + o http://msdn.microsoft.com/library/default.asp? + url=/library/en-us/winui/hh/winui/messques_77zk.asp + o http://msdn.microsoft.com/library/default.asp? + url=/library/en-us/winsock/hh/winsock/apistart_9g1e.asp + o http://msdn.microsoft.com/library/default.asp? + url=/library/en-us/dnmgmt/html/msdn_getpeek.asp + o http://developer.novell.com/support/winsock/doc/toc.htm + +*/ + +int silc_select(SilcScheduleFd fds, SilcUInt32 fds_count, struct timeval *timeout) { HANDLE handles[MAXIMUM_WAIT_OBJECTS]; - DWORD ready; - int nhandles = 0; - int timeo, i; + DWORD ready, curtime; + LONG timeo; + int nhandles = 0, i; + MSG msg; - /* Check fd sets (ignoring the exceptfds for now) */ + if (fds_count > MAXIMUM_WAIT_OBJECTS) + fds_count = MAXIMUM_WAIT_OBJECTS; - if (readfds) { - for (i = 0; i < n - 1; i++) - if (FD_ISSET(i, readfds)) - handles[nhandles++] = (HANDLE)i; - } + for (i = 0; i < fds_count; i++) { + if (!fds[i].events) + continue; + + if (fds[i].events & SILC_TASK_READ) + handles[nhandles++] = (HANDLE)fds[i].fd; + + /* If writing then just set the bit and return */ + if (fds[i].events & SILC_TASK_WRITE) { + fds[i].revents = SILC_TASK_WRITE; + return 1; + } - if (writefds) { - /* If write fd is set then we just return */ - for (i = 0; i < n - 1; i++) - if (FD_ISSET(i, writefds)) - return 1; + fds[i].revents = 0; } - if (!timeout) - timeo = INFINITE; - else - timeo = (timeout.tv_sec * 1000) + (timeout.tv_usec / 1000); + timeo = (timeout ? (timeout->tv_sec * 1000) + (timeout->tv_usec / 1000) : + INFINITE); + + /* If we have nothing to wait and timeout is set then register a timeout + and wait just for windows messages. */ + if (nhandles == 0 && timeout) { + UINT timer = SetTimer(NULL, 0, timeo, NULL); + curtime = GetTickCount(); + while (timer) { + WaitMessage(); + + while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) { + if (msg.message == WM_TIMER) { + KillTimer(NULL, timer); + return 0; + } + TranslateMessage(&msg); + DispatchMessage(&msg); + } + + KillTimer(NULL, timer); + if (timeo != INFINITE) { + timeo -= GetTickCount() - curtime; + curtime = GetTickCount(); + if (timeo < 0) + timeo = 0; + } + timer = SetTimer(NULL, 0, timeo, NULL); + } + } retry: - if (nhandles == 0) - return -1; - else - ready = WaitForMultipleObjects(nhandles, handles, FALSE, timeo, - QS_ALLINPUT); + curtime = GetTickCount(); + ready = MsgWaitForMultipleObjects(nhandles, handles, FALSE, timeo, + QS_ALLINPUT); if (ready == WAIT_FAILED) { + /* Wait failed with error */ SILC_LOG_WARNING(("WaitForMultipleObjects() failed")); return -1; + } else if (ready >= WAIT_ABANDONED_0 && + ready < WAIT_ABANDONED_0 + nhandles) { + /* Signal abandoned */ + SILC_LOG_WARNING(("WaitForMultipleObjects() failed (ABANDONED)")); + return -1; } else if (ready == WAIT_TIMEOUT) { + /* Timeout */ return 0; } else if (ready == WAIT_OBJECT_0 + nhandles) { - /* For Windows messages. The MSDN online says that if the application + /* Windows messages. The MSDN online says that if the application creates a window then its main loop (and we're assuming that it is our SILC Scheduler) must handle the Windows messages, so do - it here as the MSDN suggests. -Pekka */ - /* For reference: http://msdn.microsoft.com/library/default.asp? - url=/library/en-us/winui/hh/winui/messques_77zk.asp */ - MSG msg; - + it here as the MSDN suggests. */ while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) { TranslateMessage(&msg); DispatchMessage(&msg); } - /* Bad thing is that I don't know what to return, since actually - nothing for us happened. So, make another try with the waiting - and do not return. This of course may fuck up the timeouts! */ - goto retry; - } else if (ready >= WAIT_OBJECT_0 && ready < WAIT_OBJECT_0 + nhandles && - readfds) { - for (i = 0; i < n - 1; i++) { - if (ready - WAIT_OBJECT_0 != i) - FD_CLR(i, readfds); + /* If timeout is set then we must update the timeout since we won't + return and we will give the wait another try. */ + if (timeo != INFINITE) { + timeo -= GetTickCount() - curtime; + curtime = GetTickCount(); + if (timeo < 0) + timeo = 0; } - /* Always one entry in the fd set. */ - return 1; + /* Give the wait another try */ + goto retry; + } else if (ready >= WAIT_OBJECT_0 && ready < WAIT_OBJECT_0 + nhandles) { + /* Some other event, like SOCKET or something. */ + + /* Go through all fds even though only one was set. This is to avoid + starvation of high numbered fds. */ + ready -= WAIT_OBJECT_0; + do { + for (i = 0; i < fds_count; i++) { + if (!fds[i].events) + continue; + + if (fds[i].fd == (int)handles[ready]) { + fds[i].revents |= SILC_TASK_READ; + break; + } + } + + /* Check the status of the next handle and set its fd to the fd + set if data is available. */ + while (++ready < fds_count) + if (WaitForSingleObject(handles[ready], 0) == WAIT_OBJECT_0) + break; + } while (ready < fds_count); + + return i + 1; } return -1; } + +#ifdef SILC_THREADS + +/* Internal wakeup context. */ +typedef struct { + HANDLE wakeup_sema; + SilcTask wakeup_task; +} *SilcWin32Wakeup; + +SILC_TASK_CALLBACK(silc_schedule_wakeup_cb) +{ + /* Nothing */ +} + +#endif /* SILC_THREADS */ + +/* Initializes the platform specific scheduler. This for example initializes + the wakeup mechanism of the scheduler. In multi-threaded environment + the scheduler needs to be wakenup when tasks are added or removed from + the task queues. Returns context to the platform specific scheduler. */ + +void *silc_schedule_internal_init(SilcSchedule schedule, void *app_context) +{ +#ifdef SILC_THREADS + SilcWin32Wakeup wakeup; + + wakeup = silc_calloc(1, sizeof(*wakeup)); + + wakeup->wakeup_sema = CreateSemaphore(NULL, 0, 100, NULL); + if (!wakeup->wakeup_sema) { + silc_free(wakeup); + return NULL; + } + + wakeup->wakeup_task = + silc_schedule_task_add(schedule, (int)wakeup->wakeup_sema, + silc_schedule_wakeup_cb, wakeup, + 0, 0, SILC_TASK_FD, + SILC_TASK_PRI_NORMAL); + if (!wakeup->wakeup_task) { + CloseHandle(wakeup->wakeup_sema); + silc_free(wakeup); + return NULL; + } + + return (void *)wakeup; +#else + return NULL; +#endif +} + +/* Uninitializes the platform specific scheduler context. */ + +void silc_schedule_internal_uninit(void *context) +{ +#ifdef SILC_THREADS + SilcWin32Wakeup wakeup = (SilcWin32Wakeup)context; + + if (!wakeup) + return; + + CloseHandle(wakeup->wakeup_sema); + silc_free(wakeup); +#endif +} + +/* Wakes up the scheduler */ + +void silc_schedule_internal_wakeup(void *context) +{ +#ifdef SILC_THREADS + SilcWin32Wakeup wakeup = (SilcWin32Wakeup)context; + + if (!wakeup) + return; + + ReleaseSemaphore(wakeup->wakeup_sema, 1, NULL); +#endif +} + +/* Register signal */ + +void silc_schedule_internal_signal_register(void *context, + SilcUInt32 signal, + SilcTaskCallback callback, + void *callback_context) +{ + +} + +/* Unregister signal */ + +void silc_schedule_internal_signal_unregister(void *context, + SilcUInt32 signal, + SilcTaskCallback callback, + void *callback_context) +{ + +} + +/* Mark signal to be called later. */ + +void silc_schedule_internal_signal_call(void *context, SilcUInt32 signal) +{ + +} + +/* Call all signals */ + +void silc_schedule_internal_signals_call(void *context, + SilcSchedule schedule) +{ + +} + +/* Block registered signals in scheduler. */ + +void silc_schedule_internal_signals_block(void *context) +{ + +} + +/* Unblock registered signals in schedule. */ + +void silc_schedule_internal_signals_unblock(void *context) +{ + +}