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Fix potential dead lock in PyDataProvider2 #139

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Fix potential dead lock in PyDataProvider2 #139

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15 changes: 9 additions & 6 deletions paddle/gserver/dataproviders/PyDataProvider2.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -377,11 +377,17 @@ class PyDataProvider2 : public DataProvider {
std::swap(callingContexts_[cid], callingContexts_[0]);
cid = 0;
}

PyObjectPtr front;
{
std::unique_lock<std::mutex> l(mtx_);
front = pop_get_front(callingContexts_);
this->pullCV_.notify_all();
}
{
PyGuard g;
callingContexts_.pop_front();
front.reset();
}
this->pullCV_.notify_all();
continue;
}
}
Expand Down Expand Up @@ -410,9 +416,6 @@ class PyDataProvider2 : public DataProvider {
std::lock_guard<std::mutex> guard(mtx_);
poolActualSize_ += additionalBatchSize;
dataPool_.emplace_back(data);
}

{
pullCV_.notify_all();
}
}
Expand Down Expand Up @@ -592,8 +595,8 @@ class PyDataProvider2 : public DataProvider {
{
std::lock_guard<std::mutex> g(mtx_);
poolActualSize_ -= bsize;
this->pushCV_.notify_all();
}
this->pushCV_.notify_all();
}

if (bsize == 0) { // end of pass. In data pool, cannot get any data.
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2 changes: 1 addition & 1 deletion paddle/utils/Logging.h
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Expand Up @@ -191,7 +191,7 @@ void installFailureWriter(void(*callback)(const char*, int));
}
#endif // PADDLE_USE_GLOG

#ifndef NDEBUG
#ifdef NDEBUG
#define DEBUG_LEVEL 5
#define DBG VLOG(DEBUG_LEVEL)
#else
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11 changes: 11 additions & 0 deletions paddle/utils/Util.h
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Expand Up @@ -112,6 +112,17 @@ static bool contains(const Container& container, const T& val) {
return std::find(container.begin(), container.end(), val) != container.end();
}

/**
* pop and get the front element of a container
*/
template<typename Container>
typename Container::value_type pop_get_front(Container& c) {
typename Container::value_type v;
swap(v, c.front());
c.pop_front();
return v;
}

#define ARRAYSIZE(a) (sizeof(a) / sizeof(*(a)))

/**
Expand Down