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