//telo provadeciho vlakna procesu
DWORD CProcess::Start()
{
Run(); // popis aktivnich fazi procesu
// po jejich vykonani:
CProcess* next;
if (event != NULL) // pokud ma proces zaznam o udalosti
{
next=NextEv();
event->Out();
delete(event); // odstrani jej
event = NULL;
if (next!=NULL) // v SQS je zaznam o dalsim procesu
// tady nekde prerusit pri krokovani
next->Resume(); // aktivuj tento proces
}
terminated = true; // oznac proces za ukonceny
return 0; // a ukonci proceduru vlakna
}
void CJobObject::Suspend() {
CMutex::CEnter MutexEnter(m_Mutex);
map<DWORD, int> ErrorProcesses;
map<DWORD, int>::iterator ErrorProcess;
map<DWORD, BOOL> Processes;
map<DWORD, BOOL>::iterator CurrentProcess;
map<DWORD, CProcess*>::iterator OldProcess;
BOOL bNewProcesses;
// Clear all Threads contained in the m_Threads member
for (OldProcess = m_Processes.begin();
OldProcess != m_Processes.end();
OldProcess++) {
delete OldProcess->second;
}
m_Processes.clear();
// A)
// Seach all threads which belong to this process and suspend them. To do this we create
// a snapshot and suspend all threads contained in the snapshot.
// Between A1 and A2 it is possible that new threads will be created. This makes it necessary to
// create a new snapshot and to suspend all new threads which we not suspended in a previous
// iteration.
bNewProcesses = TRUE;
while (bNewProcesses) {
PJOBOBJECT_BASIC_PROCESS_ID_LIST pPidList;
bNewProcesses = FALSE;
pPidList = CreatePidList();
// A1
if (pPidList == NULL) {
throw CCodineException(L"Pid List is NULL", __FILE__, __LINE__);
} else {
for (int i = 0; i < pPidList->NumberOfProcessIdsInList; i++) {
if (m_Processes.find(pPidList->ProcessIdList[i]) == m_Processes.end()) {
CProcess *NewProcess = NULL;
try {
NewProcess = new CProcess(pPidList->ProcessIdList[i]);
NewProcess->Suspend();
m_Processes[pPidList->ProcessIdList[i]] = NewProcess;
Processes[pPidList->ProcessIdList[i]] = true;
bNewProcesses = TRUE;
} catch (CCodineException& ex) {
ErrorProcess = ErrorProcesses.find(pPidList->ProcessIdList[i]);
if (ErrorProcess == ErrorProcesses.end()
|| (ErrorProcess != ErrorProcesses.end() && ErrorProcess->second < 3)) {
// Possible reasons for the exception
// * We didn't get a handle
// - Thread exited
// * Thread belongs to a different process
// (no access)
// - Thread exited and another process created
// a thread with the same id between A1 and A2
//
// => we try it once more -> the next snapshot won't
// contain the current thread
CTrace::Print(CTrace::Layer::TEST, L"Catched Exception during suspended"
L" for thread %ld", pPidList->ProcessIdList[i]);
ErrorProcesses[pPidList->ProcessIdList[i]]++;
bNewProcesses = TRUE;
} else {
// If we get an error three times for the same thread
// then we will assume that this thread belongs really
// to this process
//
// => we could not solve the problem => ERROR
throw ex;
}
}
}
}
// A2
}
DestroyPidList();
}
// B
// Between A and B we created a map of suspended threads (Threads)
// but we can not be sure that all these threads belong to this process
// (=> recycling of thread id's). It is possible, that we suspended
// threads of foreign processes!. Now we will set pair.second to false
// for all threads which belong to the current process
{
PJOBOBJECT_BASIC_PROCESS_ID_LIST pPidList;
int i;
pPidList = CreatePidList();
if (pPidList == NULL) {
throw CCodineException(L"Pid List is NULL", __FILE__, __LINE__);
} else {
try {
for (i = 0; i < pPidList->NumberOfProcessIdsInList; i++) {
CurrentProcess = Processes.find(pPidList->ProcessIdList[i]);
if (CurrentProcess == Processes.end()) {
// If we get a new thread id here, then someone else
// created a new thread for this process (CreateRemoteThread())
CTrace::Print(CTrace::Layer::TEST, L"Unexpected new thread %ld", pPidList->ProcessIdList[i]);
throw CCodineException(L"", __FILE__, __LINE__);
} else {
CurrentProcess->second = FALSE;
}
}
} catch (CCodineException& ex) {
map<DWORD, CProcess*>::iterator TheProcess;
// If we come here then we will rollback previous activities
// Therefore we have to resume all threads contained in Threads
for (TheProcess = m_Processes.begin();
TheProcess != m_Processes.end();
TheProcess++) {
try {
(*TheProcess).second->Resume();
} catch (CCodineException&) {
;
}
}
throw ex;
}
}
DestroyPidList();
}
// C
// Between B and C we set pair.second to false for all threads
// which belong to the current process
// Now we have to resume the remaining threads
// We will also add the suspended threads of this process to
// the member m_Threads.
try {
// Resume and copy
for (CurrentProcess = Processes.begin();
CurrentProcess != Processes.end();
CurrentProcess++) {
if (CurrentProcess->second == TRUE) {
CProcess *ForeignProcess = m_Processes[CurrentProcess->first];
ForeignProcess->Resume();
m_Processes.erase(CurrentProcess->first);
CTrace::Print(CTrace::Layer::TEST, L"Resumed foreign thread %ld", CurrentProcess->first);
break;
}
}
} catch (CCodineException& ex) {
// What can we do here?
throw ex;
}
}
