forked from OSchip/llvm-project
97 lines
2.9 KiB
C++
97 lines
2.9 KiB
C++
//===-- llvm/Support/Threading.cpp- 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 defines 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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#include "llvm/Support/Threading.h"
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#include "llvm/Config/config.h"
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#include "llvm/Support/Host.h"
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#include <cassert>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only TRULY operating system
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//=== independent code.
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//===----------------------------------------------------------------------===//
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bool llvm::llvm_is_multithreaded() {
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#if LLVM_ENABLE_THREADS != 0
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return true;
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#else
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return false;
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#endif
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}
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#if LLVM_ENABLE_THREADS == 0 || \
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(!defined(_WIN32) && !defined(HAVE_PTHREAD_H))
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// Support for non-Win32, non-pthread implementation.
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void llvm::llvm_execute_on_thread(void (*Fn)(void *), void *UserData,
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unsigned RequestedStackSize) {
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(void)RequestedStackSize;
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Fn(UserData);
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}
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unsigned llvm::heavyweight_hardware_concurrency() { return 1; }
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unsigned llvm::hardware_concurrency() { return 1; }
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uint64_t llvm::get_threadid() { return 0; }
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uint32_t llvm::get_max_thread_name_length() { return 0; }
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void llvm::set_thread_name(const Twine &Name) {}
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void llvm::get_thread_name(SmallVectorImpl<char> &Name) { Name.clear(); }
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#else
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#include <thread>
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unsigned llvm::heavyweight_hardware_concurrency() {
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// Since we can't get here unless LLVM_ENABLE_THREADS == 1, it is safe to use
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// `std::thread` directly instead of `llvm::thread` (and indeed, doing so
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// allows us to not define `thread` in the llvm namespace, which conflicts
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// with some platforms such as FreeBSD whose headers also define a struct
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// called `thread` in the global namespace which can cause ambiguity due to
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// ADL.
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int NumPhysical = sys::getHostNumPhysicalCores();
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if (NumPhysical == -1)
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return std::thread::hardware_concurrency();
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return NumPhysical;
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}
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unsigned llvm::hardware_concurrency() {
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#if defined(HAVE_SCHED_GETAFFINITY) && defined(HAVE_CPU_COUNT)
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cpu_set_t Set;
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if (sched_getaffinity(0, sizeof(Set), &Set))
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return CPU_COUNT(&Set);
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#endif
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// Guard against std::thread::hardware_concurrency() returning 0.
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if (unsigned Val = std::thread::hardware_concurrency())
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return Val;
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return 1;
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}
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// Include the platform-specific parts of this class.
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#ifdef LLVM_ON_UNIX
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#include "Unix/Threading.inc"
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#endif
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#ifdef _WIN32
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#include "Windows/Threading.inc"
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#endif
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#endif
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