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94 lines
2.9 KiB
C++
94 lines
2.9 KiB
C++
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// natVMSelectorImplWin32.cc
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/* Copyright (C) 2003, 2004, 2007 Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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#include <config.h>
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#include <platform.h>
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#include <gnu/java/nio/VMSelector.h>
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#include <java/lang/Thread.h>
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jint
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gnu::java::nio::VMSelector::select (jintArray read, jintArray write,
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jintArray except, jlong timeout)
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{
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// FIXME: The API for implSelect is biased towards POSIX implementations.
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jint* pReadFD = elements (read);
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int nNbReadFDs = JvGetArrayLength (read);
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jint* pWriteFD = elements (write);
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int nNbWriteFDs = JvGetArrayLength (write);
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int nNbEvents = nNbReadFDs + nNbWriteFDs;
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// Create and initialize our event wrapper array
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// FIXME: We're creating fresh WSAEVENTs for each call.
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// This is inefficient. It would probably be better to cache these
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// in the Win32 socket implementation class.
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WSAEventWrapper aArray[nNbEvents];
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int nCurIndex = 0;
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for (int i=0; i < nNbReadFDs; ++i)
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aArray[nCurIndex++].init(pReadFD[i], FD_ACCEPT | FD_READ);
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for (int i=0; i < nNbWriteFDs; ++i)
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aArray[nCurIndex++].init(pWriteFD[i], FD_WRITE);
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// Build our array of WSAEVENTs to wait on. Also throw in our thread's
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// interrupt event in order to detect thread interruption.
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HANDLE arh[nNbEvents + 1];
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for (int i=0; i < nNbEvents; ++i)
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arh[i] = aArray[i].getEventHandle();
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arh[nNbEvents] = _Jv_Win32GetInterruptEvent ();
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// A timeout value of 0 needs to be treated as infinite.
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if (timeout <= 0)
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timeout = WSA_INFINITE;
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// Do the select.
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DWORD dwRet = WSAWaitForMultipleEvents (nNbEvents+1, arh, 0, timeout, false);
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if (dwRet == WSA_WAIT_FAILED)
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_Jv_ThrowIOException ();
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// Before we do anything else, clear output file descriptor arrays.
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memset(pReadFD, 0, sizeof(jint) * nNbReadFDs);
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memset(pWriteFD, 0, sizeof(jint) * nNbWriteFDs);
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memset(elements (except), 0, sizeof(jint) * JvGetArrayLength (except));
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if (dwRet == DWORD(WSA_WAIT_EVENT_0 + nNbEvents))
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{
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// We were interrupted. Set the current thread's interrupt
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// status and get out of here, with nothing selected..
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::java::lang::Thread::currentThread ()->interrupt ();
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return 0;
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}
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else if (dwRet < DWORD(WSA_WAIT_EVENT_0 + nNbEvents))
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{
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int nSelectedEventIndex = dwRet - WSA_WAIT_EVENT_0;
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// Record the selected file descriptor.
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// FIXME: This implementation only allows one file descriptor
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// to be selected at a time. Remedy this by looping on
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// WSAWaitForMultipleEvents 'til nothing more is selected.
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jint fd = aArray[nSelectedEventIndex].getFD();
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if (nSelectedEventIndex < nNbReadFDs)
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pReadFD[0] = fd;
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else
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pWriteFD[0] = fd;
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return 1;
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}
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else
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// None of the event objects was signalled, so nothing was
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// selected.
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return 0;
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}
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