From 1f6efa3996dd1929fbc129203ce5009b620e6969 Mon Sep 17 00:00:00 2001
From: "Michael J. Spencer" <bigcheesegs@gmail.com>
Date: Mon, 29 Nov 2010 18:16:10 +0000
Subject: Merge System into Support.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120298 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Support/Threading.h | 59 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 include/llvm/Support/Threading.h

(limited to 'include/llvm/Support/Threading.h')

diff --git a/include/llvm/Support/Threading.h b/include/llvm/Support/Threading.h
new file mode 100644
index 0000000000..371a8625ae
--- /dev/null
+++ b/include/llvm/Support/Threading.h
@@ -0,0 +1,59 @@
+//===-- llvm/System/Threading.h - Control multithreading mode --*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// TThis file defines llvm_start_multithreaded() and friends.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SYSTEM_THREADING_H
+#define LLVM_SYSTEM_THREADING_H
+
+namespace llvm {
+  /// llvm_start_multithreaded - Allocate and initialize structures needed to
+  /// make LLVM safe for multithreading.  The return value indicates whether
+  /// multithreaded initialization succeeded.  LLVM will still be operational
+  /// on "failed" return, and will still be safe for hosting threading
+  /// applications in the JIT, but will not be safe for concurrent calls to the
+  /// LLVM APIs.
+  /// THIS MUST EXECUTE IN ISOLATION FROM ALL OTHER LLVM API CALLS.
+  bool llvm_start_multithreaded();
+
+  /// llvm_stop_multithreaded - Deallocate structures necessary to make LLVM
+  /// safe for multithreading.
+  /// THIS MUST EXECUTE IN ISOLATION FROM ALL OTHER LLVM API CALLS.
+  void llvm_stop_multithreaded();
+
+  /// llvm_is_multithreaded - Check whether LLVM is executing in thread-safe
+  /// mode or not.
+  bool llvm_is_multithreaded();
+
+  /// acquire_global_lock - Acquire the global lock.  This is a no-op if called
+  /// before llvm_start_multithreaded().
+  void llvm_acquire_global_lock();
+
+  /// release_global_lock - Release the global lock.  This is a no-op if called
+  /// before llvm_start_multithreaded().
+  void llvm_release_global_lock();
+
+  /// llvm_execute_on_thread - Execute the given \arg UserFn on a separate
+  /// thread, passing it the provided \arg UserData.
+  ///
+  /// This function does not guarantee that the code will actually be executed
+  /// on a separate thread or honoring the requested stack size, but tries to do
+  /// so where system support is available.
+  ///
+  /// \param UserFn - The callback to execute.
+  /// \param UserData - An argument to pass to the callback function.
+  /// \param RequestedStackSize - If non-zero, a requested size (in bytes) for
+  /// the thread stack.
+  void llvm_execute_on_thread(void (*UserFn)(void*), void *UserData,
+                              unsigned RequestedStackSize = 0);
+}
+
+#endif
-- 
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