/Users/buildslave/jenkins/sharedspace/clang-stage2-coverage-R@2/llvm/lib/Support/Threading.cpp
Line | Count | Source (jump to first uncovered line) |
1 | | //===-- llvm/Support/Threading.cpp- Control multithreading mode --*- C++ -*-==// |
2 | | // |
3 | | // The LLVM Compiler Infrastructure |
4 | | // |
5 | | // This file is distributed under the University of Illinois Open Source |
6 | | // License. See LICENSE.TXT for details. |
7 | | // |
8 | | //===----------------------------------------------------------------------===// |
9 | | // |
10 | | // This file defines helper functions for running LLVM in a multi-threaded |
11 | | // environment. |
12 | | // |
13 | | //===----------------------------------------------------------------------===// |
14 | | |
15 | | #include "llvm/Support/Threading.h" |
16 | | #include "llvm/Config/config.h" |
17 | | #include "llvm/Support/Host.h" |
18 | | |
19 | | #include <cassert> |
20 | | #include <errno.h> |
21 | | #include <stdlib.h> |
22 | | #include <string.h> |
23 | | |
24 | | using namespace llvm; |
25 | | |
26 | | //===----------------------------------------------------------------------===// |
27 | | //=== WARNING: Implementation here must contain only TRULY operating system |
28 | | //=== independent code. |
29 | | //===----------------------------------------------------------------------===// |
30 | | |
31 | 84.7M | bool llvm::llvm_is_multithreaded() { |
32 | 84.7M | #if LLVM_ENABLE_THREADS != 0 |
33 | 84.7M | return true; |
34 | | #else |
35 | | return false; |
36 | | #endif |
37 | | } |
38 | | |
39 | | #if LLVM_ENABLE_THREADS == 0 || \ |
40 | | (!defined(LLVM_ON_WIN32) && !defined(HAVE_PTHREAD_H)) |
41 | | // Support for non-Win32, non-pthread implementation. |
42 | | void llvm::llvm_execute_on_thread(void (*Fn)(void *), void *UserData, |
43 | | unsigned RequestedStackSize) { |
44 | | (void)RequestedStackSize; |
45 | | Fn(UserData); |
46 | | } |
47 | | |
48 | | unsigned llvm::heavyweight_hardware_concurrency() { return 1; } |
49 | | |
50 | | uint64_t llvm::get_threadid() { return 0; } |
51 | | |
52 | | uint32_t llvm::get_max_thread_name_length() { return 0; } |
53 | | |
54 | | void llvm::set_thread_name(const Twine &Name) {} |
55 | | |
56 | | void llvm::get_thread_name(SmallVectorImpl<char> &Name) { Name.clear(); } |
57 | | |
58 | | #else |
59 | | |
60 | | #include <thread> |
61 | 485 | unsigned llvm::heavyweight_hardware_concurrency() { |
62 | 485 | // Since we can't get here unless LLVM_ENABLE_THREADS == 1, it is safe to use |
63 | 485 | // `std::thread` directly instead of `llvm::thread` (and indeed, doing so |
64 | 485 | // allows us to not define `thread` in the llvm namespace, which conflicts |
65 | 485 | // with some platforms such as FreeBSD whose headers also define a struct |
66 | 485 | // called `thread` in the global namespace which can cause ambiguity due to |
67 | 485 | // ADL. |
68 | 485 | int NumPhysical = sys::getHostNumPhysicalCores(); |
69 | 485 | if (NumPhysical == -1) |
70 | 0 | return std::thread::hardware_concurrency(); |
71 | 485 | return NumPhysical; |
72 | 485 | } |
73 | | |
74 | | // Include the platform-specific parts of this class. |
75 | | #ifdef LLVM_ON_UNIX |
76 | | #include "Unix/Threading.inc" |
77 | | #endif |
78 | | #ifdef LLVM_ON_WIN32 |
79 | | #include "Windows/Threading.inc" |
80 | | #endif |
81 | | |
82 | | #endif |