多媒体计时器timesetevent 最多能创建多少个？

haoxihuan 2013-02-25 06:01:50

小弟写一个测试服务器的客户端程序，其中使用timesetevent来创建计时器向服务器发送命令，模拟1000个客户端时，发现创建10多个计时器后，timesetevent就创建失败了。请问各位大侠,timesetevent到底能创建多少个计时器？

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haoxihuan 2013-03-20

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系统资源有限，果断用多线程搞定

fishion 2013-02-25

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应该用多线程

一个傻冒 2013-02-25

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MMRESULT WINAPI timeSetEvent(UINT wDelay, UINT wResol, LPTIMECALLBACK lpFunc, DWORD_PTR dwUser, UINT wFlags) { return TIME_SetEventInternal(wDelay, wResol, lpFunc, dwUser, wFlags); } /************************************************************************** * TIME_SetEventInternal [internal] */ WORD TIME_SetEventInternal(UINT wDelay, UINT wResol, LPTIMECALLBACK lpFunc, DWORD dwUser, UINT wFlags) { WORD wNewID = 0; LPWINE_TIMERENTRY lpNewTimer; LPWINE_TIMERENTRY lpTimer; TRACE("(%u, %u, %p, %08lX, %04X);\n", wDelay, wResol, lpFunc, dwUser, wFlags); if (wDelay < MMSYSTIME_MININTERVAL || wDelay > MMSYSTIME_MAXINTERVAL) return 0; lpNewTimer = HeapAlloc(GetProcessHeap(), 0, sizeof(WINE_TIMERENTRY)); if (lpNewTimer == NULL) return 0; TIME_MMTimeStart(); lpNewTimer->wDelay = wDelay; lpNewTimer->dwTriggerTime = GetTickCount() + wDelay; /* FIXME - wResol is not respected, although it is not clear that we could change our precision meaningfully */ lpNewTimer->wResol = wResol; lpNewTimer->lpFunc = lpFunc; lpNewTimer->dwUser = dwUser; lpNewTimer->wFlags = wFlags; EnterCriticalSection(&WINMM_cs); if ((wFlags & TIME_KILL_SYNCHRONOUS) && !TIME_hKillEvent) TIME_hKillEvent = CreateEventW(NULL, TRUE, TRUE, NULL); for (lpTimer = TIME_TimersList; lpTimer != NULL; lpTimer = lpTimer->lpNext) { wNewID = max(wNewID, lpTimer->wTimerID); } lpNewTimer->lpNext = TIME_TimersList; TIME_TimersList = lpNewTimer; lpNewTimer->wTimerID = wNewID + 1; LeaveCriticalSection(&WINMM_cs); /* Wake the service thread in case there is work to be done */ SetEvent(TIME_hWakeEvent); TRACE("=> %u\n", wNewID + 1); return wNewID + 1; } 这是在ReactOS上的代码。这并不能完全代表windows。但可供兄弟们参考。似乎看不到有限制。两处返回，最有可能的是堆分配失败。