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435 lines
11 KiB
435 lines
11 KiB
// wait.cpp - written and placed in the public domain by Wei Dai
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#include "pch.h"
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#include "config.h"
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#if CRYPTOPP_MSC_VERSION
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# pragma warning(disable: 4189)
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#endif
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#include "wait.h"
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#include "misc.h"
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#include "smartptr.h"
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#ifdef SOCKETS_AVAILABLE
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#ifdef USE_BERKELEY_STYLE_SOCKETS
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <unistd.h>
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#endif
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NAMESPACE_BEGIN(CryptoPP)
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unsigned int WaitObjectContainer::MaxWaitObjects()
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{
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#ifdef USE_WINDOWS_STYLE_SOCKETS
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return MAXIMUM_WAIT_OBJECTS * (MAXIMUM_WAIT_OBJECTS-1);
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#else
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return FD_SETSIZE;
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#endif
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}
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WaitObjectContainer::WaitObjectContainer(WaitObjectsTracer* tracer)
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: m_tracer(tracer), m_eventTimer(Timer::MILLISECONDS), m_lastResult(0)
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, m_sameResultCount(0), m_noWaitTimer(Timer::MILLISECONDS)
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{
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Clear();
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m_eventTimer.StartTimer();
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}
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void WaitObjectContainer::Clear()
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{
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#ifdef USE_WINDOWS_STYLE_SOCKETS
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m_handles.clear();
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#else
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m_maxFd = 0;
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FD_ZERO(&m_readfds);
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FD_ZERO(&m_writefds);
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#endif
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m_noWait = false;
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m_firstEventTime = 0;
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}
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inline void WaitObjectContainer::SetLastResult(LastResultType result)
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{
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if (result == m_lastResult)
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m_sameResultCount++;
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else
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{
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m_lastResult = result;
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m_sameResultCount = 0;
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}
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}
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void WaitObjectContainer::DetectNoWait(LastResultType result, CallStack const& callStack)
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{
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if (result == m_lastResult && m_noWaitTimer.ElapsedTime() > 1000)
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{
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if (m_sameResultCount > m_noWaitTimer.ElapsedTime())
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{
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if (m_tracer)
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{
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std::string desc = "No wait loop detected - m_lastResult: ";
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desc.append(IntToString(m_lastResult)).append(", call stack:");
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for (CallStack const* cs = &callStack; cs; cs = cs->Prev())
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desc.append("\n- ").append(cs->Format());
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m_tracer->TraceNoWaitLoop(desc);
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}
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try { throw 0; } catch (...) {} // help debugger break
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}
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m_noWaitTimer.StartTimer();
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m_sameResultCount = 0;
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}
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}
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void WaitObjectContainer::SetNoWait(CallStack const& callStack)
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{
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DetectNoWait(LastResultType(LASTRESULT_NOWAIT), CallStack("WaitObjectContainer::SetNoWait()", &callStack));
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m_noWait = true;
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}
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void WaitObjectContainer::ScheduleEvent(double milliseconds, CallStack const& callStack)
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{
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if (milliseconds <= 3)
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DetectNoWait(LastResultType(LASTRESULT_SCHEDULED), CallStack("WaitObjectContainer::ScheduleEvent()", &callStack));
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double thisEventTime = m_eventTimer.ElapsedTimeAsDouble() + milliseconds;
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if (!m_firstEventTime || thisEventTime < m_firstEventTime)
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m_firstEventTime = thisEventTime;
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}
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#ifdef USE_WINDOWS_STYLE_SOCKETS
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struct WaitingThreadData
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{
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bool waitingToWait, terminate;
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HANDLE startWaiting, stopWaiting;
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const HANDLE *waitHandles;
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unsigned int count;
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HANDLE threadHandle;
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DWORD threadId;
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DWORD* error;
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};
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WaitObjectContainer::~WaitObjectContainer()
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{
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try // don't let exceptions escape destructor
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{
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if (!m_threads.empty())
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{
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HANDLE threadHandles[MAXIMUM_WAIT_OBJECTS] = {0};
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unsigned int i;
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for (i=0; i<m_threads.size(); i++)
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{
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// Enterprise Analysis warning
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if(!m_threads[i]) continue;
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WaitingThreadData &thread = *m_threads[i];
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while (!thread.waitingToWait) // spin until thread is in the initial "waiting to wait" state
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Sleep(0);
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thread.terminate = true;
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threadHandles[i] = thread.threadHandle;
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}
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BOOL bResult = PulseEvent(m_startWaiting);
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assert(bResult != 0); CRYPTOPP_UNUSED(bResult);
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// Enterprise Analysis warning
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DWORD dwResult = ::WaitForMultipleObjects((DWORD)m_threads.size(), threadHandles, TRUE, INFINITE);
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assert((dwResult >= WAIT_OBJECT_0) && (dwResult < (DWORD)m_threads.size()));
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for (i=0; i<m_threads.size(); i++)
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{
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// Enterprise Analysis warning
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if (!threadHandles[i]) continue;
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bResult = CloseHandle(threadHandles[i]);
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assert(bResult != 0);
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}
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bResult = CloseHandle(m_startWaiting);
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assert(bResult != 0);
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bResult = CloseHandle(m_stopWaiting);
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assert(bResult != 0);
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}
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}
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catch (const Exception&)
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{
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assert(0);
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}
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}
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void WaitObjectContainer::AddHandle(HANDLE handle, CallStack const& callStack)
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{
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DetectNoWait(m_handles.size(), CallStack("WaitObjectContainer::AddHandle()", &callStack));
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m_handles.push_back(handle);
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}
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DWORD WINAPI WaitingThread(LPVOID lParam)
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{
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member_ptr<WaitingThreadData> pThread((WaitingThreadData *)lParam);
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WaitingThreadData &thread = *pThread;
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std::vector<HANDLE> handles;
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while (true)
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{
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thread.waitingToWait = true;
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DWORD result = ::WaitForSingleObject(thread.startWaiting, INFINITE);
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assert(result != WAIT_FAILED);
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thread.waitingToWait = false;
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if (thread.terminate)
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break;
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if (!thread.count)
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continue;
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handles.resize(thread.count + 1);
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handles[0] = thread.stopWaiting;
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std::copy(thread.waitHandles, thread.waitHandles+thread.count, handles.begin()+1);
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result = ::WaitForMultipleObjects((DWORD)handles.size(), &handles[0], FALSE, INFINITE);
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assert(result != WAIT_FAILED);
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if (result == WAIT_OBJECT_0)
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continue; // another thread finished waiting first, so do nothing
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SetEvent(thread.stopWaiting);
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if (!(result > WAIT_OBJECT_0 && result < WAIT_OBJECT_0 + handles.size()))
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{
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assert(!"error in WaitingThread"); // break here so we can see which thread has an error
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*thread.error = ::GetLastError();
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}
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}
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return S_OK; // return a value here to avoid compiler warning
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}
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void WaitObjectContainer::CreateThreads(unsigned int count)
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{
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size_t currentCount = m_threads.size();
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if (currentCount == 0)
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{
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m_startWaiting = ::CreateEvent(NULL, TRUE, FALSE, NULL);
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m_stopWaiting = ::CreateEvent(NULL, TRUE, FALSE, NULL);
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}
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if (currentCount < count)
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{
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m_threads.resize(count);
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for (size_t i=currentCount; i<count; i++)
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{
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// Enterprise Analysis warning
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if(!m_threads[i]) continue;
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m_threads[i] = new WaitingThreadData;
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WaitingThreadData &thread = *m_threads[i];
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thread.terminate = false;
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thread.startWaiting = m_startWaiting;
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thread.stopWaiting = m_stopWaiting;
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thread.waitingToWait = false;
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thread.threadHandle = CreateThread(NULL, 0, &WaitingThread, &thread, 0, &thread.threadId);
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}
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}
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}
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bool WaitObjectContainer::Wait(unsigned long milliseconds)
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{
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if (m_noWait || (m_handles.empty() && !m_firstEventTime))
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{
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SetLastResult(LastResultType(LASTRESULT_NOWAIT));
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return true;
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}
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bool timeoutIsScheduledEvent = false;
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if (m_firstEventTime)
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{
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double timeToFirstEvent = SaturatingSubtract(m_firstEventTime, m_eventTimer.ElapsedTimeAsDouble());
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if (timeToFirstEvent <= milliseconds)
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{
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milliseconds = (unsigned long)timeToFirstEvent;
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timeoutIsScheduledEvent = true;
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}
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if (m_handles.empty() || !milliseconds)
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{
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if (milliseconds)
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Sleep(milliseconds);
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SetLastResult(timeoutIsScheduledEvent ? LASTRESULT_SCHEDULED : LASTRESULT_TIMEOUT);
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return timeoutIsScheduledEvent;
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}
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}
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if (m_handles.size() > MAXIMUM_WAIT_OBJECTS)
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{
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// too many wait objects for a single WaitForMultipleObjects call, so use multiple threads
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static const unsigned int WAIT_OBJECTS_PER_THREAD = MAXIMUM_WAIT_OBJECTS-1;
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unsigned int nThreads = (unsigned int)((m_handles.size() + WAIT_OBJECTS_PER_THREAD - 1) / WAIT_OBJECTS_PER_THREAD);
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if (nThreads > MAXIMUM_WAIT_OBJECTS) // still too many wait objects, maybe implement recursive threading later?
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throw Err("WaitObjectContainer: number of wait objects exceeds limit");
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CreateThreads(nThreads);
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DWORD error = S_OK;
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for (unsigned int i=0; i<m_threads.size(); i++)
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{
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// Enterprise Analysis warning
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if(!m_threads[i]) continue;
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WaitingThreadData &thread = *m_threads[i];
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while (!thread.waitingToWait) // spin until thread is in the initial "waiting to wait" state
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Sleep(0);
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if (i<nThreads)
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{
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thread.waitHandles = &m_handles[i*WAIT_OBJECTS_PER_THREAD];
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thread.count = UnsignedMin(WAIT_OBJECTS_PER_THREAD, m_handles.size() - i*WAIT_OBJECTS_PER_THREAD);
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thread.error = &error;
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}
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else
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thread.count = 0;
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}
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ResetEvent(m_stopWaiting);
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PulseEvent(m_startWaiting);
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DWORD result = ::WaitForSingleObject(m_stopWaiting, milliseconds);
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assert(result != WAIT_FAILED);
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if (result == WAIT_OBJECT_0)
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{
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if (error == S_OK)
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return true;
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else
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throw Err("WaitObjectContainer: WaitForMultipleObjects in thread failed with error " + IntToString(error));
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}
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SetEvent(m_stopWaiting);
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if (result == WAIT_TIMEOUT)
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{
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SetLastResult(timeoutIsScheduledEvent ? LASTRESULT_SCHEDULED : LASTRESULT_TIMEOUT);
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return timeoutIsScheduledEvent;
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}
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else
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throw Err("WaitObjectContainer: WaitForSingleObject failed with error " + IntToString(::GetLastError()));
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}
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else
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{
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#if TRACE_WAIT
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static Timer t(Timer::MICROSECONDS);
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static unsigned long lastTime = 0;
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unsigned long timeBeforeWait = t.ElapsedTime();
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#endif
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DWORD result = ::WaitForMultipleObjects((DWORD)m_handles.size(), &m_handles[0], FALSE, milliseconds);
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#if TRACE_WAIT
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if (milliseconds > 0)
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{
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unsigned long timeAfterWait = t.ElapsedTime();
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OutputDebugString(("Handles " + IntToString(m_handles.size()) + ", Woke up by " + IntToString(result-WAIT_OBJECT_0) + ", Busied for " + IntToString(timeBeforeWait-lastTime) + " us, Waited for " + IntToString(timeAfterWait-timeBeforeWait) + " us, max " + IntToString(milliseconds) + "ms\n").c_str());
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lastTime = timeAfterWait;
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}
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#endif
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if (result >= WAIT_OBJECT_0 && result < WAIT_OBJECT_0 + m_handles.size())
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{
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if (result == m_lastResult)
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m_sameResultCount++;
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else
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{
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m_lastResult = result;
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m_sameResultCount = 0;
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}
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return true;
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}
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else if (result == WAIT_TIMEOUT)
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{
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SetLastResult(timeoutIsScheduledEvent ? LASTRESULT_SCHEDULED : LASTRESULT_TIMEOUT);
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return timeoutIsScheduledEvent;
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}
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else
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throw Err("WaitObjectContainer: WaitForMultipleObjects failed with error " + IntToString(::GetLastError()));
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}
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}
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#else // #ifdef USE_WINDOWS_STYLE_SOCKETS
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void WaitObjectContainer::AddReadFd(int fd, CallStack const& callStack) // TODO: do something with callStack
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{
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CRYPTOPP_UNUSED(callStack);
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FD_SET(fd, &m_readfds);
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m_maxFd = STDMAX(m_maxFd, fd);
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}
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void WaitObjectContainer::AddWriteFd(int fd, CallStack const& callStack) // TODO: do something with callStack
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{
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CRYPTOPP_UNUSED(callStack);
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FD_SET(fd, &m_writefds);
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m_maxFd = STDMAX(m_maxFd, fd);
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}
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bool WaitObjectContainer::Wait(unsigned long milliseconds)
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{
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if (m_noWait || (!m_maxFd && !m_firstEventTime))
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return true;
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bool timeoutIsScheduledEvent = false;
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if (m_firstEventTime)
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{
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double timeToFirstEvent = SaturatingSubtract(m_firstEventTime, m_eventTimer.ElapsedTimeAsDouble());
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if (timeToFirstEvent <= milliseconds)
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{
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milliseconds = (unsigned long)timeToFirstEvent;
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timeoutIsScheduledEvent = true;
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}
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}
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timeval tv, *timeout;
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if (milliseconds == INFINITE_TIME)
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timeout = NULL;
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else
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{
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tv.tv_sec = milliseconds / 1000;
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tv.tv_usec = (milliseconds % 1000) * 1000;
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timeout = &tv;
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}
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int result = select(m_maxFd+1, &m_readfds, &m_writefds, NULL, timeout);
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if (result > 0)
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return true;
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else if (result == 0)
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return timeoutIsScheduledEvent;
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else
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throw Err("WaitObjectContainer: select failed with error " + IntToString(errno));
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}
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#endif
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// ********************************************************
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std::string CallStack::Format() const
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{
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return m_info;
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}
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std::string CallStackWithNr::Format() const
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{
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return std::string(m_info) + " / nr: " + IntToString(m_nr);
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}
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std::string CallStackWithStr::Format() const
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{
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return std::string(m_info) + " / " + std::string(m_z);
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}
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bool Waitable::Wait(unsigned long milliseconds, CallStack const& callStack)
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{
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WaitObjectContainer container;
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GetWaitObjects(container, callStack); // reduce clutter by not adding this func to stack
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return container.Wait(milliseconds);
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}
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NAMESPACE_END
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#endif
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