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Make the lazy initialization of DefaultTimerGroup threadsafe.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73963 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2009-06-23 17:33:37 +00:00
parent a0162ff2b9
commit 3b8d135879
1 changed files with 14 additions and 8 deletions
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22
lib/Support/Timer.cpp
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@ -52,8 +52,20 @@ namespace {
static TimerGroup *DefaultTimerGroup = 0;
static TimerGroup *getDefaultTimerGroup() {
if (DefaultTimerGroup) return DefaultTimerGroup;
return DefaultTimerGroup = new TimerGroup("Miscellaneous Ungrouped Timers");
TimerGroup* tmp = DefaultTimerGroup;
sys::MemoryFence();
if (!tmp) {
llvm_acquire_global_lock();
tmp = DefaultTimerGroup;
if (!tmp) {
tmp = new TimerGroup("Miscellaneous Ungrouped Timers");
sys::MemoryFence();
DefaultTimerGroup = tmp;
}
llvm_release_global_lock();
}
return tmp;
}
Timer::Timer(const std::string &N)
@ -377,11 +389,5 @@ void TimerGroup::removeTimer() {
if (OutStream != cerr.stream() && OutStream != cout.stream())
delete OutStream; // Close the file...
}
// Delete default timer group!
if (NumTimers == 0 && this == DefaultTimerGroup) {
delete DefaultTimerGroup;
DefaultTimerGroup = 0;
}
}