auto merge of #11187 : alexcrichton/rust/once, r=brson

Rationale can be found in the first commit, but this is basically the same thing as `pthread_once`

1 files changed, 0 insertions, 22 deletions

diff --git a/src/rustllvm/RustWrapper.cpp b/src/rustllvm/RustWrapper.cpp
index d66f90a5352..335c7b2c65b 100644
--- a/src/rustllvm/RustWrapper.cpp
+++ b/src/rustllvm/RustWrapper.cpp
@@ -149,28 +149,6 @@ extern "C" LLVMValueRef LLVMInlineAsm(LLVMTypeRef Ty,
                                IsAlignStack, (InlineAsm::AsmDialect) Dialect));
 }
 
-/**
- * This function is intended to be a threadsafe interface into enabling a
- * multithreaded LLVM. This is invoked at the start of the translation phase of
- * compilation to ensure that LLVM is ready.
- *
- * All of trans properly isolates LLVM with the use of a different
- * LLVMContextRef per task, thus allowing parallel compilation of different
- * crates in the same process. At the time of this writing, the use case for
- * this is unit tests for rusti, but there are possible other applications.
- */
-extern "C" bool LLVMRustStartMultithreading() {
-    static Mutex lock;
-    bool ret = true;
-    assert(lock.acquire());
-    if (!LLVMIsMultithreaded()) {
-        ret = LLVMStartMultithreaded();
-    }
-    assert(lock.release());
-    return ret;
-}
-
-
 typedef DIBuilder* DIBuilderRef;
 
 template<typename DIT>