deskflow/src/lib/mt/Thread.cpp

/*
 * Deskflow -- mouse and keyboard sharing utility
 * Copyright (C) 2012-2016 Symless Ltd.
 * Copyright (C) 2002 Chris Schoeneman
 *
 * This package is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * found in the file LICENSE that should have accompanied this file.
 *
 * This package is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "mt/Thread.h"

#include "arch/Arch.h"
#include "base/IJob.h"
#include "base/Log.h"
#include "mt/XMT.h"
#include "mt/XThread.h"
#include <exception>

//
// Thread
//

Thread::Thread(IJob *job) {
  m_thread = ARCH->newThread(&Thread::threadFunc, job);
  if (m_thread == NULL) {
    // couldn't create thread
    delete job;
    throw XMTThreadUnavailable();
  }
}

Thread::Thread(const Thread &thread) {
  m_thread = ARCH->copyThread(thread.m_thread);
}

Thread::Thread(ArchThread adoptedThread) { m_thread = adoptedThread; }

Thread::~Thread() { ARCH->closeThread(m_thread); }

Thread &Thread::operator=(const Thread &thread) {
  // copy given thread and release ours
  ArchThread copy = ARCH->copyThread(thread.m_thread);
  ARCH->closeThread(m_thread);

  // cut over
  m_thread = copy;

  return *this;
}

void Thread::exit(void *result) { throw XThreadExit(result); }

void Thread::cancel() { ARCH->cancelThread(m_thread); }

void Thread::setPriority(int n) { ARCH->setPriorityOfThread(m_thread, n); }

void Thread::unblockPollSocket() { ARCH->unblockPollSocket(m_thread); }

Thread Thread::getCurrentThread() { return Thread(ARCH->newCurrentThread()); }

void Thread::testCancel() { ARCH->testCancelThread(); }

bool Thread::wait(double timeout) const {
  return ARCH->wait(m_thread, timeout);
}

void *Thread::getResult() const {
  if (wait())
    return ARCH->getResultOfThread(m_thread);
  else
    return NULL;
}

IArchMultithread::ThreadID Thread::getID() const {
  return ARCH->getIDOfThread(m_thread);
}

bool Thread::operator==(const Thread &thread) const {
  return ARCH->isSameThread(m_thread, thread.m_thread);
}

bool Thread::operator!=(const Thread &thread) const {
  return !ARCH->isSameThread(m_thread, thread.m_thread);
}

void *Thread::threadFunc(void *vjob) {
  // get this thread's id for logging
  IArchMultithread::ThreadID id;
  {
    ArchThread thread = ARCH->newCurrentThread();
    id = ARCH->getIDOfThread(thread);
    ARCH->closeThread(thread);
  }

  // get job
  IJob *job = static_cast<IJob *>(vjob);

  // run job
  void *result = NULL;
  try {
    // go
    LOG((CLOG_DEBUG1 "thread 0x%08x entry", id));
    job->run();
    LOG((CLOG_DEBUG1 "thread 0x%08x exit", id));
  } catch (XThreadCancel &) {
    // client called cancel()
    LOG((CLOG_DEBUG1 "caught cancel on thread 0x%08x", id));
    delete job;
    throw;
  } catch (XThreadExit &e) {
    // client called exit()
    result = e.m_result;
    LOG((CLOG_DEBUG1 "caught exit on thread 0x%08x, result %p", id, result));
  } catch (XBase &e) {
    LOG((CLOG_ERR "deskflow exception on thread 0x%08x: %s", id, e.what()));
    delete job;
    throw;
  } catch (std::exception &e) {
    LOG((CLOG_ERR "standard exception on thread 0x%08x: %s", id, e.what()));
    delete job;
    throw;
  } catch (...) {
    LOG((CLOG_ERR "non-exception throw on thread 0x%08x: <unknown>", id));
    delete job;
    throw;
  }

  // done with job
  delete job;

  // return exit result
  return result;
}