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/*
FALCON - Falcon advanced simple text evaluator.
FILE: systhread_win.cpp
System dependent MT provider - MS-Windows specific.
-------------------------------------------------------------------
Author: Giancarlo Niccolai
Begin: Wed, 09 Apr 2008 21:32:31 +0200
-------------------------------------------------------------------
(C) Copyright 2008: the FALCON developers (see list in AUTHORS file)
See LICENSE file for licensing details.
*/
/** \file
System dependent MT provider - MS-Windows specific.
*/
#include "systhread_win.h"
#include <falcon/memory.h>
#include <falcon/vm_sys.h>
#include <falcon/vm_sys_win.h>
#include "waitable.h"
#include "systhread.h"
#include "threading_mod.h"
#include <process.h>
static DWORD runningThreadKey = 0;
namespace Falcon {
namespace Ext {
//======================================================
// Waitable
//
void WaitableProvider::init( Waitable *wo )
{
wo->m_sysData = CreateEvent( NULL, TRUE, FALSE, NULL );
}
void WaitableProvider::destroy( Waitable *wo )
{
CloseHandle( ( HANDLE) wo->m_sysData );
}
void WaitableProvider::signal( Waitable *wo )
{
SetEvent( (HANDLE) wo->m_sysData );
}
void WaitableProvider::broadcast( Waitable *wo )
{
PulseEvent( (HANDLE) wo->m_sysData );
}
//======================================================
// Thread
//
WIN_THI_DATA::WIN_THI_DATA()
{
hth = INVALID_HANDLE_VALUE;
thID = 0;
lastError = 0;
}
WIN_THI_DATA::~WIN_THI_DATA()
{
if( hth != INVALID_HANDLE_VALUE )
CloseHandle( hth );
}
void WaitableProvider::interruptWaits( ThreadImpl *runner )
{
// dummy; under windows interrupting the VM is enough
}
int WaitableProvider::waitForObjects( const ThreadImpl *runner, int32 count, Waitable **objects, int64 time )
{
WIN_THI_DATA *data = (WIN_THI_DATA *) runner->sysData();
const ::Falcon::Sys::SystemData &sd = runner->vm().systemData();
// first, let's see if we have some data ready
// in case of no wait, just check for availability
for ( int32 i = 0; i < count; i++ )
{
// try-acquire semantic.
if ( objects[i]->acquire() )
{
// eventually clear signalation on this object
WaitForSingleObject( (HANDLE) objects[i]->m_sysData, 0 );
return i;
}
}
// noway.
if ( time == 0 )
return -1;
HANDLE waited[ MAX_WAITER_OBJECTS ];
for ( int wid = 0; wid < count && wid < MAX_WAITER_OBJECTS; wid ++ )
waited[wid] = (HANDLE) objects[wid]->m_sysData;
int cancHandle;
Sys::VM_SYS_DATA* vmsd = sd.m_sysData;
if ( vmsd->evtInterrupt != INVALID_HANDLE_VALUE )
{
waited[count] = vmsd->evtInterrupt;
cancHandle = 1;
}
else
cancHandle = 0;
// TODO: Add cancellation event
DWORD now;
DWORD targetTime;
if( time < 0 )
{
now = 0;
targetTime = INFINITE;
}
else
{
now = ::GetTickCount();
targetTime = now + (DWORD)(time/1000);
}
// now wait till we can acquire something.
int acquired = -1;
while( true )
{
DWORD res = WaitForMultipleObjects( count+cancHandle, waited, FALSE, targetTime - now );
if ( res == WAIT_TIMEOUT )
{
// nothing to do...
return -1;
}
else if ( res == WAIT_OBJECT_0 + count )
{
// Cancelled
return -2;
}
// try to acquire the signaled item.
acquired = res - WAIT_OBJECT_0;
if ( acquired < 0 || acquired >= count || ! objects[acquired]->acquire() )
{
// try again. If we have a target time, update wait
if ( time > 0 )
{
now = ::GetTickCount();
if ( now >= targetTime )
{
// we timed out
return -1;
}
// otherwise, continue
}
}
else {
// we acquired the object
// Reset the event; just to prevent other wakeups, even if we know that some went.
ResetEvent( (HANDLE) objects[acquired]->m_sysData );
break; // so we can return outside the loop
}
}
return acquired;
}
void* createSysData() {
return new WIN_THI_DATA;
}
void disposeSysData( void *data )
{
if ( data != 0 )
{
WIN_THI_DATA* ptr = (WIN_THI_DATA*) data;
delete ptr;
}
}
}
}
/* end of systhread_win.cpp */
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