forked from OSchip/llvm-project
117 lines
3.6 KiB
C++
117 lines
3.6 KiB
C++
//===-- llvm/Support/Threading.cpp- Control multithreading mode --*- C++ -*-==//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines helper functions for running LLVM in a multi-threaded
|
|
// environment.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Support/Threading.h"
|
|
#include "llvm/ADT/Optional.h"
|
|
#include "llvm/Config/config.h"
|
|
#include "llvm/Support/Host.h"
|
|
|
|
#include <cassert>
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
using namespace llvm;
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
//=== WARNING: Implementation here must contain only TRULY operating system
|
|
//=== independent code.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
bool llvm::llvm_is_multithreaded() {
|
|
#if LLVM_ENABLE_THREADS != 0
|
|
return true;
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
#if LLVM_ENABLE_THREADS == 0 || \
|
|
(!defined(_WIN32) && !defined(HAVE_PTHREAD_H))
|
|
uint64_t llvm::get_threadid() { return 0; }
|
|
|
|
uint32_t llvm::get_max_thread_name_length() { return 0; }
|
|
|
|
void llvm::set_thread_name(const Twine &Name) {}
|
|
|
|
void llvm::get_thread_name(SmallVectorImpl<char> &Name) { Name.clear(); }
|
|
|
|
llvm::BitVector llvm::get_thread_affinity_mask() { return {}; }
|
|
|
|
unsigned llvm::ThreadPoolStrategy::compute_thread_count() const {
|
|
// When threads are disabled, ensure clients will loop at least once.
|
|
return 1;
|
|
}
|
|
|
|
#else
|
|
|
|
int computeHostNumHardwareThreads();
|
|
|
|
unsigned llvm::ThreadPoolStrategy::compute_thread_count() const {
|
|
int MaxThreadCount = UseHyperThreads ? computeHostNumHardwareThreads()
|
|
: sys::getHostNumPhysicalCores();
|
|
if (MaxThreadCount <= 0)
|
|
MaxThreadCount = 1;
|
|
if (ThreadsRequested == 0)
|
|
return MaxThreadCount;
|
|
if (!Limit)
|
|
return ThreadsRequested;
|
|
return std::min((unsigned)MaxThreadCount, ThreadsRequested);
|
|
}
|
|
|
|
// Include the platform-specific parts of this class.
|
|
#ifdef LLVM_ON_UNIX
|
|
#include "Unix/Threading.inc"
|
|
#endif
|
|
#ifdef _WIN32
|
|
#include "Windows/Threading.inc"
|
|
#endif
|
|
|
|
// Must be included after Threading.inc to provide definition for llvm::thread
|
|
// because FreeBSD's condvar.h (included by user.h) misuses the "thread"
|
|
// keyword.
|
|
#include "llvm/Support/thread.h"
|
|
|
|
#if defined(__APPLE__)
|
|
// Darwin's default stack size for threads except the main one is only 512KB,
|
|
// which is not enough for some/many normal LLVM compilations. This implements
|
|
// the same interface as std::thread but requests the same stack size as the
|
|
// main thread (8MB) before creation.
|
|
const llvm::Optional<unsigned> llvm::thread::DefaultStackSize = 8 * 1024 * 1024;
|
|
#else
|
|
const llvm::Optional<unsigned> llvm::thread::DefaultStackSize = None;
|
|
#endif
|
|
|
|
|
|
#endif
|
|
|
|
Optional<ThreadPoolStrategy>
|
|
llvm::get_threadpool_strategy(StringRef Num, ThreadPoolStrategy Default) {
|
|
if (Num == "all")
|
|
return llvm::hardware_concurrency();
|
|
if (Num.empty())
|
|
return Default;
|
|
unsigned V;
|
|
if (Num.getAsInteger(10, V))
|
|
return None; // malformed 'Num' value
|
|
if (V == 0)
|
|
return Default;
|
|
|
|
// Do not take the Default into account. This effectively disables
|
|
// heavyweight_hardware_concurrency() if the user asks for any number of
|
|
// threads on the cmd-line.
|
|
ThreadPoolStrategy S = llvm::hardware_concurrency();
|
|
S.ThreadsRequested = V;
|
|
return S;
|
|
}
|