FGFS-4.1/simgear
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Ensure sglog() singleton is threadsafe.

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Slightly simplistic, but definitiely correct, method
for ensuring singleton creation is threadsafe. Can
be optimised if lock contention is ever an issue.
This commit is contained in:
James Turner 2013-09-04 08:32:05 +01:00
parent e06f9e35b3
commit dd93eb88f2
1 changed files with 7 additions and 0 deletions
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7
simgear/debug/logstream.cxx
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@ -348,6 +348,13 @@ sglog()
{ {
// Force initialization of cerr. // Force initialization of cerr.
static std::ios_base::Init initializer; static std::ios_base::Init initializer;
// http://www.aristeia.com/Papers/DDJ_Jul_Aug_2004_revised.pdf
// in the absence of portable memory barrier ops in Simgear,
// let's keep this correct & safe
static SGMutex m;
SGGuard<SGMutex> g(m);
if( !global_logstream ) if( !global_logstream )
global_logstream = new logstream(); global_logstream = new logstream();
return *global_logstream; return *global_logstream;