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core: parallel_for_(): propagate RNG state from the main thread

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This commit is contained in:
Alexander Alekhin 2017-02-28 17:27:26 +03:00
parent 78784040aa
commit b28fd79fdc
1 changed files with 7 additions and 0 deletions
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7
modules/core/src/parallel.cpp
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@ -174,6 +174,9 @@ namespace
double len = wholeRange.end - wholeRange.start;
nstripes = cvRound(_nstripes <= 0 ? len : MIN(MAX(_nstripes, 1.), len));
// propagate main thread state
rng = cv::theRNG();
#ifdef ENABLE_INSTRUMENTATION
pThreadRoot = cv::instr::getInstrumentTLSStruct().pCurrentNode;
#endif
@ -195,6 +198,9 @@ namespace
#endif
CV_INSTRUMENT_REGION()
// propagate main thread state
cv::theRNG() = rng;
cv::Range r;
r.start = (int)(wholeRange.start +
((uint64)sr.start*(wholeRange.end - wholeRange.start) + nstripes/2)/nstripes);
@ -208,6 +214,7 @@ namespace
const cv::ParallelLoopBody* body;
cv::Range wholeRange;
int nstripes;
cv::RNG rng;
#ifdef ENABLE_INSTRUMENTATION
cv::instr::InstrNode *pThreadRoot;
#endif