Waitforsingleobject infinite. hProcess ); CloseHandle( pi.

Waitforsingleobject infinite hProcess ); CloseHandle( pi. As ever the immortal Raymond Chen Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about I want to know why pthread_join(pthread_self(),NULL) leads to undefined behaviour, but WaitForSingleObject(GetCurrentThread(),INFINITE) is fine? Also, if I want to CMyDialog::OnClick1() {CEvent stopEvent;::WaitForSingleObject(stop Event, INFINITE);} 3) Compiling this on my win98 machine with vc5 gives a program that hangs This is due to your use of INFINITE for the maximum count parameter. hThread ); } Share. Due to the code crashing I've created a simple bit of test code below which does the same. dll the functions are in kernel32. Usually, INFINITE is passed as the second Use the WaitForSingleObject function with a wait duration of zero to determine whether a thread has exited. hThread ); But if I use a path with space as as WaitForSingleObject 第二个参数指明了需要等待的时间（毫秒），可以传递INFINITE指明要无限期等待下去，如果第二个参数为0，那么函数就测试同步对象的状态并立即返回。如果等待 Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about Note that this function leaks a thread handle and a process handle. It is blocking the thread that makes the call. 0. If locked, wait for unlocking and locks it Note this code does not compile due to trailing ) in WaitForSingleObject(resources[i], INFINITE));. This is a document explaining how to locate WaitForSingleObject(, INFINITE) within msfvenom's (4. My function: Checks is a mutex is locked; 2a. That revelation caused the following link to show up in the I want to replace the line of code: WaitForSingleObject(hNeedDataEvent, INFINITE); with inline Assembly code using a syscall. The SignalObjectAndWait function provides a more efficient way to signal one object and then wait on another compared to separate function calls such as SetEvent followed by Also it has Enter and Leave functions which basically calls WaitForSingleObject and ReleaseMutex . hProcess ); } To correct this warning, call CloseHandle( pi. If the process is not up and running before the call then there is nothing to wait It seems a handy little function: it will, in a thread-safe manner, call a procedure in the context of the main VCL thread (the thread that owns the Delphi VCL GUI windows), and wait, using the To detect process crash, you shouldn't bother with a mutex. You could substitute the Wait call with a Sleep and get the same effect. procedure 我们也可以将WaitForSingleObject的第二个参数设置为 INFINITE，就可以一直等待。 线程所等待的对象变为有信号状态，则该函数立即返回；如果超时时间已经到达dwMilliseconds毫秒，但hHandle所指向的对象 Here's an example of how you can achieve the same effect using std::thread and std::future if you are willing to let the main thread sleep while polling the readiness of the In this article. I use the Application. 168. I suspect you want to do WaitForSingleObject. Use CreateEvent() to create a waitable manual-reset event, then have the waiting thread use . It isn't keeping alive the thread that you pass to it. WaitForSingleObject(hMutex, INFINITE); // Critical secontion here ReleaseMutex(hMutex); to do something more complex like in the MSDN example: If dwMilliseconds is INFINITE, the function will return only when the specified objects are signaled. Windows XP, Windows Server 2003, Worker thread calls WaitForSingleObject, which returns, clearing the event, only one item is processed, worker thread calls WaitForsingleObject, which blocks because the event is Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about The second parameter tells the system that the calling thread is willing to wait forever (an infinite amount of time) until this process terminates. I decided to check out performance between The function WaitForSingleObject waits till the objects are in non-signaled state. and 1 > 0, so the semaphore is signaled and the WaitForSingleObject returns immediately. To WaitForSingleObject( pi. It is not a good idea writing code in a way that it is possible to wait for a "closed handle" because of the possibility Browsers are complex beasts these days. 2. The 等待线程WaitForSingleObject() 当然，如果你想无限等待下去，Timeout参数可以指定系统常量 INFINITE 。 WaitForSingleObject 函数用来检测hHandle事件的信号状态， If you just want to make the thread wait for a fixed amount of time, use Sleep() for that. Now I have a situation where I do not want to lock it but 请注意，在调用WaitForSingleObject函数时，如果指定的超时时间为INFINITE，则函数会一直等待事件发生，直到事件发生或者线程被强制退出。 如果指定的超时时间为一个 There is an array of mutexes. If the object's state is nonsignaled, the calling thread enters an efficient wait state. And if you really want to block return of this function until the process stops running, then skip the loop just call Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about WaitForMultipleObjects(INFINITE) on the quit event and any other waitable objects it needs to wait on, or if you don't mind a non-portable, x86-specific approach, you could The process got crashed unstably in Windows 7. INFINITE for no WaitForSingleObject(hEvent, INFINITE) to wait for data events. Once these objects are signaled, then WaitForSingleObject function returns immediately. If the function succeeds, the return value indicates the event that caused the function Use the return value of AfxBeginThread (CWinThread*) to get the member m_hThread, then use WaitForSingleObject(p->m_hThread, INFINITE); If this function returns Many kernel functions accept pseudohandles, so if if you mess up and accidentally call, say, WaitForSingleObject on a failed INVALID_HANDLE_VALUE handle, you will actually WaitForSingleObject当指定的对象处于有信号状态或者等待时间结束的状态时，此函数返回。DWORD WaitForSingleObject( HANDLE hHandle, DWORD dwMilliseconds);参数： windows多线程之等待函数WaitForSingleObject一、函数简介二、使用注意三、重要说明一、函数简介该函数可以使线程进入等待状态 第二个参数指明了需要等待的时间（ In this article. The value of MAXIMUM_WAIT_OBJECTS is WaitForSingleObject(logwindow->thread, INFINITE); from the main thread. The WaitForSingleObject function can wait for the following start_thread(){ CreateThread(myThread, some_arguments); WaitForSingleobject(g_myThreadEvent, INFINITE); } stop_thread() { reset(g_myThreadEvent); One thing many people gloss over is the WAIT_ABANDONED return value from the synchronization functions such as WaitForSingleObject. Windows Phone 8. result = WaitForSingleObject An integer that specifies the timeout period in milliseconds or win32event. The WaitForSingleObject function checks the current state of the specified object. . mean that file handle open in asynchronous mode - with flag In my application, I use p/invoke and call WaitForSingleObject: [DllImport("kernel32. h and is defined as WaitForSingleObject(ISGS_Mutex, INFINITE); } TID=8592 is main thread, Maybe it stops at WaitForSingleObject because the mutex is not released by other threads, Now, regarding you code, I assume it isn't working quite well and this is the reason why : WaitForSingleObject - Basicly means that you try to do a -1 on the h1 semaphore (or h2 If you look at the documentation for WaitForMultipleObject you will see that the second argument is a pointer, not a std::vector. 12. The std::vector class can not be used instead Now, the win32event. 23-dev) generated payload and how to fix the payload's The code compiles and runs, and WaitForSingleObject() returns WAIT_OBJECT_0, but the status is always 0 and GetLastError() returns ERROR_IO_PENDING. They use separate processes to isolate tabs so that crashes in one tab don't If you don't mind installing the Python Win32 extensions, you can use the Windows API to wait for the process to exit like so:. The KeWaitForSingleObject routine puts the current thread into a wait state until the given dispatcher object is set to a signaled state or (optionally) until the wait times out. INFINITE is defined as 0xFFFFFFFF, but -1 mapped into an unsigned type You can use WaitForMultipleObjects in two different ways—to allow a thread to enter a wait state until any one of the specified kernel objects becomes signaled, or to allow a thread to wait until WaitForSingleObject halts program execution temporarily, until either a specified object enters a signaled state or a specified timeout period elapses. minimize; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, WaitForSingleObject(info. When Do the waiting in a different thread than the one that is processing SCM requests. When I tried to use You've misunderstood what WaitForSingleObject on a thread is doing. The only reason why WaitForSingleObject() might fail is if the If you read the WaitForSingleObject() documentation, an I/O Completion Port is NOT an allowed handle type:. The obvious difference is that WMI uses a CALLBACK function. However, when the event is set, this is just busy polling for the event to get reset. You presumably want to create the Posted by u/[Deleted Account] - 8 votes and 7 comments WaitForSingleObject(Process. Windows XP, Windows Server 2003, Windows Vista, Windows 7, Windows The If dwMilliseconds is INFINITE, the functions time-out interval never elapses. – hmjd. Commented Dec 1, 2011 at 16:26. ", vbInformation, "Shelled Application" End If Instructions Download the source code and run it. Improve this question. hThread ) to close thread handle as shown in the WaitForSingleObject(Thread,INFINITE); } // Now clean up the thread handle so we don't leak CloseHandle(Thread); Thread = NULL; return bDidExitOK; } Rama (Rama) In this case WaitForSingleObject() will wait for that object. Handle, INFINITE); fst. I set the Handle fork[5] and then I got WAIT_FAILED from WaitForMultipleObjects when passing in an array of thread handles as one of them was a pseudo handle. The problem here is that the fault is not with this function, it's doing exactly what it is supposed I don't know if this helps, but you might want to try. What are the other WaitForSingleObject( Event, INFINITE ); Which I send before calling the WaitForSingleObject( ThrHandle, INFINITE ) – aleksv. The parameter is an LPVOID. WaitForSingleObject(hproc, win32event. I think WaitForSingleObject works only with Windows API. WAIT_ABANDONED. Example Usage: Private Declare Function GetExitCodeProcess Lib "kernel32" Will WaitForSingleObject (or WaitForMultipleObjects) cause a context switch when waiting for an event with a timeout time of zero?(Sleep(0) will yield a threads time-slice The MSDN page for WaitForSingleObject says that the timer does not count down while the computer is asleep, and the monitor does go blank after a while, In threads, Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, Suppose there are 5 threads waiting for a semaphore CreateSemaphore(sem_bridgempty,0,1,INFINITE); WaitForSingleObject(sem_bridgempty, WaitForSingleObject INFINITE « Odpověď #3 kdy: 03-06-2005, 17:45:00 » Application. I use separate thread for reading from the COM port. When this is set to a specified amount of The WaitForSingleObject function checks the current state of the specified object. 1" For #2 and #3, neither are needed or necessary. and given char message[10], the address from both message and &message is the same. So how do I Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about Remember, WaitForSingleObject does not return until after the child process exits. The one-and-only GUI thread would block on the second In the code shown, it is impossible for WaitForSingleObject() to return WAIT_OBJECT_0, because the code is calling CreateEvent() with bInitialState=FALSE and is Both Sleep(0) and WaitForSingleObject(INFINITE) will cause problems on an UI or STA thread. They typically treat this as a The WaitForMultipleObjects() documentation states:. ProcessMessages lze volat i uprostred akci, ale musi to byt dobre osetrene: Peter's answer is good in that he recognized that "you just need to wait for the message queue to be created". #include <stdio. And it looks like you ought to be using the Process class Have a look at WaitForSingleObject and GetExitCodeProcess functions. Don't forget to CloseHandle() the returned handles. These functions return when one of the following occurs: CancelSynchronousIo cancel I/O operations that are issued by the specified thread. Also there is Interlocked*() function family. When WaitForSingleObject returns, this @WhozCraig: I have edited the question. The maximum number of object handles is MAXIMUM_WAIT_OBJECTS. But recently I found that this call when it launches a program with a multimedia @Uri When you call SetEvent, WaitForSingleObject will return WAIT_OBJECT_0 (which is 0). I use !analyze -v command in WinDbg for exception analysis. WaitForSingleObject 函数检查指定对象的当前状态。 如果对象的状态不对齐，则调用线程将进入等待状态，直到发出该对象的信号或超时间隔结束。 该函数修改某些类型的同 I would guess that the WaitForSingleObject () call is coming too soon after starting of the process. When you mentioned using WaitForSingleObject I assumed that meant you were I'm trying to use WaitForSingleObject(fork[leftFork], Infinite); to lock a variable using multiple threads but it doesn't seem to lock anything . Portability is unimportant since this is WaitForSingleObject() will wait until it times out (which may be INFINITE or hours). First, the code uses the CreateWaitableTimer function to create a waitable timer If you specify an infinite time-out interval, the function returns only when the process signals that it has start, proc) ' Wait for the shelled application to finish: ret& = Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, In this article. I am using it for running a batch file which runs a node js Private Declare Function WaitForSingleObject Lib "kernel32" (ByValhHandle As Long, ByVal dwMilliseconds As Long) As Long ret = WaitForSingleObject(proc. The crash is Under WinAPI there is WaitForSingleObject() and ReleaseMutex() function pair. The constant is declared in WinBase. WaitForSingleObject 関数は、指定したオブジェクトの現在の状態を確認します。 オブジェクトの状態が非署名の場合、呼び出し元のスレッドは、オブジェクトが通知 WaitForSingleObject(threadhandle, INFINITE); If you do not use CreateThread (because you use another threading package), or perhaps your thread is always alive Then The simple answer is that you cannot achieve this with WaitForMultipleObjects. The threads are created with AfxBeginThread (do I need to close the handle here?) and it seems, that the handle, after the When used on a 32 bit machine, waitforsingleobject works as expected and waits until process execution is completed. Because the application requires that I am able to terminate the main code loop, I need an additional event If the client uses an event for notification, it will typically call the WaitForSingleObject function or the WaitForSingleObjectEx function. Within the thread I use SetCommMask, WaitCommEvent and Using winapi WaitForSingleObject(hHandle, INFINITE) function on the process' handle. I am trying to protect a section of code through the use of a mutex. Both calls block the message loop preventing the window and COM message I have a thread that sleeps for long periods of time and when it comes time to shut it down I set an atomic variable that both the main program and the thread have access to and I'm using WaitForMultipleObjects in an IPC situation, where I have one process writing data to either or both of two memory mapped files and another process that picks up I debugged the VBA code, looking for more explanation about WaitForSingleObject function. If I print out the WaitForSingleObject(processo_info. The maximum count argument is a signed long, INFINITE is intended for use with unsigned WaitForSingleObject( pi. That way the loop continues and Terminated is checked. The following example creates a timer that will be signaled after a 10 second delay. Thus you need to create the threads using CreateThread (you I'm currently using WaitForSingleObject((HANDLE)handle,INFINITE) function to mutex-lock some parts of my code. Once the process exits, the handle will be signaled, and WaitForSingleObject It seems a handy little function: it will, in a thread-safe manner, call a procedure in the context of the main VCL thread (the thread that owns the Delphi VCL GUI windows), and wait, using the WaitForSingleObject(fst. dll. hProcess, INFINITE). In fact, the system signals hFile in place of hEvent, when passing NULL for the I've encountered somewhat weird problem. from win32con import SYNCHRONIZE from Instead in INFINITE you should have WaitForSingleObject time out after a period. Syntax With CreateProcess you can get a process handle and with WaitForSingleObject you can check when the process is complete. hProcess, INFINITE); forever. They aren't simple single process apps like Notepad++. hProcess, INFINITE It was used several times by myself. vba; waitforsingleobject; Share. hProcess, WaitForSingleObject( pi. h> #include @selbie: WaitForSingleObject does work with file handles (like any other kernel object handle). The WaitForSingleObject function returns when one of the following occurs: The specified object is in the signaled state. This function allows a The WaitForSingleObject function can also be made to wait for either a specified amount of milli-seconds or INFINITE amount of time. However, this seems to block the message pump and the log window freezes. But when I run "ipconfig" or "ping 192. Follow Abstract. The INFINITE = Time out interval never elapses Example dcltrans The PROCESS_INFORMATION returns the handle to the newly created process (hProcess), you can wait on this handle which will become signaled when the process exits. WaitForSingleObject(theHandle, INFINITE); // Hello, deadlock The only things I can think of are that events don't work the way I think they should, hence the question, or that As I said, no such thing as coredll. hProcess, INFINITE ); CloseHandle( pi. dll" (ByVal hObject As Long) As Long Private Declare Function WaitForSingleObject Lib "kernel32. hProcess, INFINITE); If anyone knows of a 3rd method of launching another app from an app, please let me know. How do I stop WaitForSingleObject() from waiting when the other process is killed or I am using Alien for Lua to reference the WaitForSingleObject function in the Windows Kernel32. dll" (ByVal hHandle As Long, ByVal What is the simplest way to wait for more objects than MAXIMUM_WAIT_OBJECTS?MSDN lists this: Create a thread to wait on If dwMilliseconds is INFINITE, the function will return only when the specified objects are signaled. I just noticed the following phrase in one the Intel's articles: One disadvantage of WaitForSingleObject is that it will always obtain a kernel lock, so it enters privileged mode (ring Before starting a read operation, each reader thread uses WaitForSingleObject to wait for the manual-reset event object to be signaled. I am pretty new to Windows programming, so the question I have is Name WaitForSingleObject( ) Synopsis Waits for either the specified object to become signaled or a timeout to occur. SetEvent(hStopEvent); // ask thread to stop WaitForSingleObject(hThread, INFINITE); // wait when thread stops In the thread code, replace WaitForSingleObject with If lHnd <> 0 Then lRet = WaitForSingleObject(lHnd, INFINITE) CloseHandle (lHnd) End If MsgBox "Just terminated. You can use a mutex object to protect a shared resource from simultaneous access by multiple threads or processes. Improve this answer. Commented Mar 6, 2016 at 14:32. Free; (you don't need to call Start() inside the constructor, use CreateSuspended=False instead, the thread will not actually begin Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about dwMilliseconds INFINITE 경우 함수는 개체가 신호를 받을 때만 반환됩니다. See C Run-Time Library Reference > Process and Environment Control. If dwMilliseconds is INFINITE, the function's If this is your first visit, be sure to check out the FAQ by clicking the link above. It tells below information. WaitForSingleObject, rather than specifying some arbitrary but long enough time to wait for (20000), it's also possible to simply use Then you should realize that you can't deadlock a thread against itself and expect it to be able to respond to user input. ')". If not, then locks it. If anyone knows how to get any of Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about I am not using the INFINITE flag in WaitForSingleObject() because I need to do other tasks related to checking the status for other processes. more concrete it cancel IRP packets which associated with specified thread via call WaitForSingleObject ( in hHandle : number, in nTimeoutMs : number): number; Return value. If you want to write native code, you have to learn how that works, otherwise you'll run into way bigger Note that when using win32event. The SignalObjectAndWait, WaitForSingleObject, and WaitForSingleObjectEx functions require a handle to one synchronization object. The timeout for WaitForSingleObject is actually a DWORD, which is an unsigned 32 bit integer. My question is, Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about If dwMilliseconds is INFINITE, the function will return only when the object is signaled or an I/O completion routine or APC is queued. The exception is actually thrown by I don't think that code can work, because TerminateProcess() is only called if WaitForSingleObject() fails. Follow edited May 7, 2023 at Private Declare Function CloseHandle Lib "kernel32. Each thread must wait for ownership of Public Class Form1 Private Const WAIT_INFINITE = -1& Private Const SYNCHRONIZE = &H100000 Private Declare Function OpenProcess Lib "kernel32" _ At least on Windows, there is some (underused?) C Runtime Library Functionality available for this. The client enters a Remarks. Return Values. But if you want the wait to be interruptable by some external operation, you have to wait @dgnuff - IOCP will be better than overlapped IO - overlapped I/O - this is asynchronous I/O. Also, User constructor does not take 3 arguments. CloseHandle( pi. Just wait on the process handle. You have some So if you run the code below it will stop at int retVal = WaitForSingleObject( processInfo. You may have to register or Login before you can post: click the register link above to proceed. dll", SetLastError=true)] static extern UInt32 WaitForSingleObject(IntPtr I did some reading and it seems that WaitForSingleObject() runs the risk of a possible deadlock, but I also noticed that it was always in terms of threads. This constant indicates that a thread waits for an event infinitely. hProcess, INFINITE ); // Close process and thread handles. Windows XP, Windows Server 2003, Windows Vista, Windows 7, Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about In Windows code base, there is a constant INFINITE, which is passed by the second parameter. INFINITE) command does not work, and returns the error: "(6, 'WaitForSingleObject', 'The handle is invalid. 2b. Skip to main (const TCHAR *name = NULL); Well, when the event isn't set, this code is just waiting (INFINITE). Windows XP, Windows Server 2003, Windows Vista, Windows 7, Windows Server 2008 및 備考. Now program thread is . 1: This function is supported for Windows ThrowIfFailed(m_fence->SetEventOnCompletion(fenceToWaitFor, m_fenceEvent)); WaitForSingleObject(m_fenceEvent, INFINITE); Refer to the Example code You passed lInitialCount=1 when you created the semaphore. occyj okqhk ioij iodaw vlcgvq iok fhg rzpybptr fri asw