Re: [Boost-bugs] [Boost C++ Libraries] #13251: Sine / cosine is not thread safe

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #13251: Sine / cosine is not thread safe
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2018-01-05 11:27:39

#13251: Sine / cosine is not thread safe
-------------------------------+----------------------------
  Reporter:  lessig@…          |      Owner:  John Maddock
      Type:  Bugs              |     Status:  new
 Milestone:  To Be Determined  |  Component:  multiprecision
   Version:  Boost 1.63.0      |   Severity:  Showstopper
Resolution:                    |   Keywords:
-------------------------------+----------------------------

Comment (by martin@…):

 Hi,

 I can reproduce the error - protecting sin/cos asin/acos with mutexes for
 testing makes the functions 'work' again.

 This problem seems to be compiler-specific, does not happen with
 clang-5.0.0 (linux), but gcc 6.3.0, 6.4.0, 7.2.0 (linux) and MSVC 14.0
 (2015) are affected, using boost 1.65.1. The problem does not occur in
 boost 1.64.0 in my setup. (boost release builds)

 I have not done much testing, but the functions only fail seldomly, and if
 they do they seem to be correct in the first digits.
 (using cpp_dec_float with 50 bits precision)

 Thanks for looking into this

-- 
Ticket URL: <https://svn.boost.org/trac10/boost/ticket/13251#comment:2>
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