Fix race when accessing std::locale::classic()
See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78552 zcash: cherry picked from commit 507145d78595e052ce13368e122f72c85093992c zcash: https://github.com/bitcoin/bitcoin/pull/9230
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@ -50,8 +50,9 @@ void MilliSleep(int64_t n)
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std::string DateTimeStrFormat(const char* pszFormat, int64_t nTime)
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{
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static std::locale classic(std::locale::classic());
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// std::locale takes ownership of the pointer
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std::locale loc(std::locale::classic(), new boost::posix_time::time_facet(pszFormat));
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std::locale loc(classic, new boost::posix_time::time_facet(pszFormat));
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std::stringstream ss;
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ss.imbue(loc);
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ss << boost::posix_time::from_time_t(nTime);
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