113 lines
3.2 KiB
C++
113 lines
3.2 KiB
C++
//===-- llvm/Support/Threading.cpp- 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.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines helper functions for running LLVM in a multi-threaded
|
|
// environment.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Support/Threading.h"
|
|
#include "llvm/Config/config.h"
|
|
#include "llvm/Support/Atomic.h"
|
|
#include "llvm/Support/Mutex.h"
|
|
#include <cassert>
|
|
|
|
using namespace llvm;
|
|
|
|
bool llvm::llvm_is_multithreaded() {
|
|
#if LLVM_ENABLE_THREADS != 0
|
|
return true;
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
#if LLVM_ENABLE_THREADS != 0 && defined(HAVE_PTHREAD_H)
|
|
#include <pthread.h>
|
|
|
|
struct ThreadInfo {
|
|
void (*UserFn)(void *);
|
|
void *UserData;
|
|
};
|
|
static void *ExecuteOnThread_Dispatch(void *Arg) {
|
|
ThreadInfo *TI = reinterpret_cast<ThreadInfo*>(Arg);
|
|
TI->UserFn(TI->UserData);
|
|
return nullptr;
|
|
}
|
|
|
|
void llvm::llvm_execute_on_thread(void (*Fn)(void*), void *UserData,
|
|
unsigned RequestedStackSize) {
|
|
ThreadInfo Info = { Fn, UserData };
|
|
pthread_attr_t Attr;
|
|
pthread_t Thread;
|
|
|
|
// Construct the attributes object.
|
|
if (::pthread_attr_init(&Attr) != 0)
|
|
return;
|
|
|
|
// Set the requested stack size, if given.
|
|
if (RequestedStackSize != 0) {
|
|
if (::pthread_attr_setstacksize(&Attr, RequestedStackSize) != 0)
|
|
goto error;
|
|
}
|
|
|
|
// Construct and execute the thread.
|
|
if (::pthread_create(&Thread, &Attr, ExecuteOnThread_Dispatch, &Info) != 0)
|
|
goto error;
|
|
|
|
// Wait for the thread and clean up.
|
|
::pthread_join(Thread, nullptr);
|
|
|
|
error:
|
|
::pthread_attr_destroy(&Attr);
|
|
}
|
|
#elif LLVM_ENABLE_THREADS!=0 && defined(LLVM_ON_WIN32)
|
|
#include "Windows/WindowsSupport.h"
|
|
#include <process.h>
|
|
|
|
struct ThreadInfo {
|
|
void (*func)(void*);
|
|
void *param;
|
|
};
|
|
|
|
static unsigned __stdcall ThreadCallback(void *param) {
|
|
struct ThreadInfo *info = reinterpret_cast<struct ThreadInfo *>(param);
|
|
info->func(info->param);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void llvm::llvm_execute_on_thread(void (*Fn)(void*), void *UserData,
|
|
unsigned RequestedStackSize) {
|
|
struct ThreadInfo param = { Fn, UserData };
|
|
|
|
HANDLE hThread = (HANDLE)::_beginthreadex(NULL,
|
|
RequestedStackSize, ThreadCallback,
|
|
¶m, 0, NULL);
|
|
|
|
if (hThread) {
|
|
// We actually don't care whether the wait succeeds or fails, in
|
|
// the same way we don't care whether the pthread_join call succeeds
|
|
// or fails. There's not much we could do if this were to fail. But
|
|
// on success, this call will wait until the thread finishes executing
|
|
// before returning.
|
|
(void)::WaitForSingleObject(hThread, INFINITE);
|
|
::CloseHandle(hThread);
|
|
}
|
|
}
|
|
#else
|
|
// Support for non-Win32, non-pthread implementation.
|
|
void llvm::llvm_execute_on_thread(void (*Fn)(void*), void *UserData,
|
|
unsigned RequestedStackSize) {
|
|
(void) RequestedStackSize;
|
|
Fn(UserData);
|
|
}
|
|
|
|
#endif
|