forked from OSchip/llvm-project
117 lines
2.9 KiB
C++
117 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 implements llvm_start_multithreaded() and friends.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Threading.h"
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#include "llvm/Support/Atomic.h"
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#include "llvm/Support/Mutex.h"
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#include "llvm/Config/config.h"
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#include <cassert>
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using namespace llvm;
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static bool multithreaded_mode = false;
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static sys::Mutex* global_lock = 0;
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bool llvm::llvm_start_multithreaded() {
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#ifdef LLVM_MULTITHREADED
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assert(!multithreaded_mode && "Already multithreaded!");
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multithreaded_mode = true;
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global_lock = new sys::Mutex(true);
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// We fence here to ensure that all initialization is complete BEFORE we
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// return from llvm_start_multithreaded().
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sys::MemoryFence();
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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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void llvm::llvm_stop_multithreaded() {
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#ifdef LLVM_MULTITHREADED
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assert(multithreaded_mode && "Not currently multithreaded!");
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// We fence here to insure that all threaded operations are complete BEFORE we
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// return from llvm_stop_multithreaded().
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sys::MemoryFence();
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multithreaded_mode = false;
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delete global_lock;
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#endif
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}
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bool llvm::llvm_is_multithreaded() {
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return multithreaded_mode;
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}
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void llvm::llvm_acquire_global_lock() {
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if (multithreaded_mode) global_lock->acquire();
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}
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void llvm::llvm_release_global_lock() {
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if (multithreaded_mode) global_lock->release();
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}
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#if defined(LLVM_MULTITHREADED) && defined(HAVE_PTHREAD_H)
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#include <pthread.h>
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struct ThreadInfo {
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void (*UserFn)(void *);
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void *UserData;
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};
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static void *ExecuteOnThread_Dispatch(void *Arg) {
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ThreadInfo *TI = reinterpret_cast<ThreadInfo*>(Arg);
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TI->UserFn(TI->UserData);
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return 0;
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}
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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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ThreadInfo Info = { Fn, UserData };
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pthread_attr_t Attr;
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pthread_t Thread;
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// Construct the attributes object.
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if (::pthread_attr_init(&Attr) != 0)
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return;
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// Set the requested stack size, if given.
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if (RequestedStackSize != 0) {
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if (::pthread_attr_setstacksize(&Attr, RequestedStackSize) != 0)
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goto error;
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}
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// Construct and execute the thread.
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if (::pthread_create(&Thread, &Attr, ExecuteOnThread_Dispatch, &Info) != 0)
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goto error;
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// Wait for the thread and clean up.
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::pthread_join(Thread, 0);
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error:
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::pthread_attr_destroy(&Attr);
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}
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#else
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// No non-pthread implementation, currently.
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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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#endif
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