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Use atomic operations when accessing statistics, and make the lazy initialization of statistics actually threadsafe.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74005 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2009-06-23 21:19:38 +00:00
parent e0fa0b42b2
commit 92915e31e9
2 changed files with 63 additions and 16 deletions
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lib/Support/Statistic.cpp
+8 -4
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@@ -66,10 +66,14 @@ void Statistic::RegisterStatistic() {
// If stats are enabled, inform StatInfo that this statistic should be
// printed.
sys::ScopedLock Writer(&*StatLock);
if (Enabled)
StatInfo->addStatistic(this);
// Remember we have been registered.
Initialized = true;
if (!Initialized) {
if (Enabled)
StatInfo->addStatistic(this);
sys::MemoryFence();
// Remember we have been registered.
Initialized = true;
}
}
namespace {