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Updating documentation as per Chandler's feedback.
This goes with the earlier commit to remove the static destructor from ManagedStatic.cpp by controlling the allocation and de-allocation of the mutex. Summary: This is part of the ongoing work to remove static constructors and destructors. Reviewers: chandlerc, rnk Reviewed By: rnk Subscribers: rnk, llvm-commits Differential Revision: http://reviews.llvm.org/D5473 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219640 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -38,12 +38,25 @@ namespace llvm {
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void llvm_execute_on_thread(void (*UserFn)(void*), void *UserData,
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unsigned RequestedStackSize = 0);
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/// \brief Execute the function specified as a template parameter once.
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///
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/// Calls \p UserFn once ever. The call uniqueness is based on the address of
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/// the function passed in via the template arguement. This means no matter how
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/// many times you call llvm_call_once<foo>() in the same or different
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/// locations, foo will only be called once.
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///
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/// Typical usage:
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/// \code
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/// void foo() {...};
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/// ...
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/// llvm_call_once<foo>();
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/// \endcode
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///
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/// \param UserFn Function to call once.
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template <void (*UserFn)(void)> void llvm_call_once() {
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#if !defined(__MINGW__)
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static std::once_flag flag;
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std::call_once(flag, UserFn);
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#else
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struct InitOnceWrapper {
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InitOnceWrapper() { UserFn(); }
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