From: Duke Yasuda [dukey@calculex.com]
Sent: Monday, June 28, 1999 4:39 PM
To: 'NTDEV (Post)'
Subject: RE: [ntdev] QueueUserApc

Hi Heldai,
Here it is:
The QueueUserApc function adds a user-mode asynchronous procedure call 
(APC) object to the APC queue of the specified thread.
DWORD QueueUserApc(
  PAPCFUNC pfnAPC, // pointer to APC function
  HANDLE hThread,  // handle to the thread
  DWORD dwData     // argument for the APC function
);

Parameters
pfnAPC
Pointer to the application-supplied APC function to be called when the 
specified thread performs an alertable wait operation.
hThread
Specifies the handle to the thread. The handle must have THREAD_SET_CONTEXT 
access.
dwData
Specifies a single DWORD argument that is passed to the APC function 
pointed to by the pfnAPC parameter.
Return Values
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. There are no error values 
defined for this function that can be retrieved by calling GetLastError.
Remarks
The APC support provided in the operating system allows an application to 
queue an APC object to a thread. Each thread has its own APC queue. The 
queuing of an APC is a request for the thread to call the APC function. The 
operating system issues a software interrupt to direct the thread to call 
the APC function.
When a user-mode APC is queued, the thread is not directed to call the APC 
function unless it is in an alertable state. After the thread is in an 
alertable state, the thread handles all pending APCs in first in, first out 
(FIFO) order, and the wait operation returns WAIT_IO_COMPLETION. A thread 
enters an alertable state by using SleepEx, SignalObjectAndWait, 
WaitForSingleObjectEx, WaitForMultipleObjectsEx, or 
MsgWaitForMultipleObjectsEx to perform an alertable wait operation.
If an application queues an APC before the thread begins running, the 
thread begins by calling the APC function. After the thread calls an APC 
function, it calls the APC functions for all APCs in its APC queue.
When the thread is terminated using the ExitThread or TerminateThread 
function, the APCs in its APC queue are lost. The APC functions are not 
called.
Note that the ReadFileEx, SetWaitableTimer, and WriteFileEx functions are 
implemented using an APC as the completion notification callback mechanism.
QuickInfo
Windows NT: Requires version 4.0 or later.
Windows 95/98: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in winbase.h.
Import Library: Use kernel32.lib.
See Also
Synchronization Overview, Synchronization Functions, 
MsgWaitForMultipleObjectsEx, ReadFileEx, SetWaitableTimer, SleepEx, 
WaitForMultipleObjectsEx, WaitForSingleObjectEx, WriteFileEx


Built on: Monday, November 16, 1998


----------
From: 	Heldai Lemos Ferreira[SMTP:heldai@seil.com.br]
Sent: 	Monday, June 28, 1999 11:35 AM
To: 	ntdev@atria.com
Subject: 	[ntdev] QueueUserApc

Hi all,

Someone know the QueueUserApc prototipe ?

Thanks in advance


Heldai Lemos Ferreira

heldai@seil.com.br

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