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We need to use double-checked locking for lazy initialization in this case when running multithreaded.
llvm-svn: 73636
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@ -19,6 +19,8 @@
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#include "llvm/ModuleProvider.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/Threading.h"
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#include "llvm/System/Atomic.h"
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#include <algorithm>
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#include <map>
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#include <set>
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@ -192,7 +194,19 @@ static std::vector<PassRegistrationListener*> *Listeners = 0;
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// ressurection after llvm_shutdown is run.
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static PassRegistrar *getPassRegistrar() {
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static PassRegistrar *PassRegistrarObj = 0;
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// Use double-checked locking to safely initialize the registrar when
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// we're running in multithreaded mode.
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if (!PassRegistrarObj)
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if (llvm_is_multithreaded()) {
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llvm_acquire_global_lock();
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if (!PassRegistrarObj) {
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PassRegistrar* tmp = new PassRegistrar();
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sys::MemoryFence();
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PassRegistrarObj = tmp;
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}
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llvm_release_global_lock();
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} else
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PassRegistrarObj = new PassRegistrar();
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return PassRegistrarObj;
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}
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