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45ed68789b
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219676 91177308-0d34-0410-b5e6-96231b3b80d8
70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
//===-- llvm/Support/Threading.h - Control multithreading mode --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares helper functions for running LLVM in a multi-threaded
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// environment.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_THREADING_H
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#define LLVM_SUPPORT_THREADING_H
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#if !defined(__MINGW__)
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#include <mutex>
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#endif
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namespace llvm {
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/// Returns true if LLVM is compiled with support for multi-threading, and
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/// false otherwise.
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bool llvm_is_multithreaded();
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/// llvm_execute_on_thread - Execute the given \p UserFn on a separate
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/// thread, passing it the provided \p UserData.
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///
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/// This function does not guarantee that the code will actually be executed
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/// on a separate thread or honoring the requested stack size, but tries to do
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/// so where system support is available.
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///
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/// \param UserFn - The callback to execute.
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/// \param UserData - An argument to pass to the callback function.
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/// \param RequestedStackSize - If non-zero, a requested size (in bytes) for
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/// the thread stack.
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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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/// \tparam 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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};
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static InitOnceWrapper InitOnceVar;
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#endif
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}
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}
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#endif
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