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Add a note on initParallel being optional in C++11.

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Gael Guennebaud 2015-11-23 13:28:43 +01:00
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doc/TopicMultithreading.dox
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@ -43,6 +43,8 @@ int main(int argc, char** argv)
} }
\endcode \endcode
\note With Eigen 3.3, and a fully C++11 compliant compiler (i.e., <a href="http://en.cppreference.com/w/cpp/language/storage_duration#Static_local_variables">thread-safe static local variable initialization</a>), then calling \c initParallel() is optional.
\warning note that all functions generating random matrices are \b not re-entrant nor thread-safe. Those include DenseBase::Random(), and DenseBase::setRandom() despite a call to Eigen::initParallel(). This is because these functions are based on std::rand which is not re-entrant. For thread-safe random generator, we recommend the use of boost::random or c++11 random feature. \warning note that all functions generating random matrices are \b not re-entrant nor thread-safe. Those include DenseBase::Random(), and DenseBase::setRandom() despite a call to Eigen::initParallel(). This is because these functions are based on std::rand which is not re-entrant. For thread-safe random generator, we recommend the use of boost::random or c++11 random feature.
In the case your application is parallelized with OpenMP, you might want to disable Eigen's own parallization as detailed in the previous section. In the case your application is parallelized with OpenMP, you might want to disable Eigen's own parallization as detailed in the previous section.