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//===-- llvm/Support/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_SUPPORT_THREADING_H
#define LLVM_SUPPORT_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 \p UserFn on a separate
/// thread, passing it the provided \p 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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