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// gold-threads.cc -- thread support for gold
// Copyright 2006, 2007 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
// This program 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, write to the Free Software
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
// MA 02110-1301, USA.
#include "gold.h"
#include <cerrno>
#include <cstring>
#ifdef ENABLE_THREADS
#include <pthread.h>
#endif
#include "gold-threads.h"
namespace gold
{
// Class Lock_impl.
class Lock_impl
{
public:
Lock_impl();
~Lock_impl();
void acquire();
void release();
private:
// This class can not be copied.
Lock_impl(const Lock_impl&);
Lock_impl& operator=(const Lock_impl&);
friend class Condvar_impl;
#ifdef ENABLE_THREADS
pthread_mutex_t mutex_;
#else
bool acquired_;
#endif
};
#ifdef ENABLE_THREADS
Lock_impl::Lock_impl()
{
pthread_mutexattr_t attr;
if (pthread_mutexattr_init(&attr) != 0)
gold_fatal(_("pthead_mutextattr_init failed: %s"), strerror(errno));
#ifdef PTHREAD_MUTEXT_ADAPTIVE_NP
if (pthread_mutextattr_settype(&attr, PTHREAD_MUTEX_ADAPTIVE_NP) != 0)
gold_fatal(_("pthread_mutextattr_settype failed: %s"), strerror(errno));
#endif
if (pthread_mutex_init (&this->mutex_, &attr) != 0)
gold_fatal(_("pthread_mutex_init failed: %s"), strerror(errno));
if (pthread_mutexattr_destroy(&attr) != 0)
gold_fatal(_("pthread_mutexattr_destroy failed: %s"), strerror(errno));
}
Lock_impl::~Lock_impl()
{
if (pthread_mutex_destroy(&this->mutex_) != 0)
gold_fatal(_("pthread_mutex_destroy failed: %s"), strerror(errno));
}
void
Lock_impl::acquire()
{
if (pthread_mutex_lock(&this->mutex_) != 0)
gold_fatal(_("pthread_mutex_lock failed: %s"), strerror(errno));
}
void
Lock_impl::release()
{
if (pthread_mutex_unlock(&this->mutex_) != 0)
gold_fatal(_("pthread_mutex_unlock failed: %s"), strerror(errno));
}
#else // !defined(ENABLE_THREADS)
Lock_impl::Lock_impl()
: acquired_(false)
{
}
Lock_impl::~Lock_impl()
{
gold_assert(!this->acquired_);
}
void
Lock_impl::acquire()
{
gold_assert(!this->acquired_);
this->acquired_ = true;
}
void
Lock_impl::release()
{
gold_assert(this->acquired_);
this->acquired_ = false;
}
#endif // !defined(ENABLE_THREADS)
// Methods for Lock class.
Lock::Lock()
{
this->lock_ = new Lock_impl;
}
Lock::~Lock()
{
delete this->lock_;
}
void
Lock::acquire()
{
this->lock_->acquire();
}
void
Lock::release()
{
this->lock_->release();
}
// Class Condvar_impl.
class Condvar_impl
{
public:
Condvar_impl();
~Condvar_impl();
void wait(Lock_impl*);
void signal();
private:
// This class can not be copied.
Condvar_impl(const Condvar_impl&);
Condvar_impl& operator=(const Condvar_impl&);
#ifdef ENABLE_THREADS
pthread_cond_t cond_;
#endif
};
#ifdef ENABLE_THREADS
Condvar_impl::Condvar_impl()
{
if (pthread_cond_init(&this->cond_, NULL) != 0)
gold_fatal(_("pthread_cond_init failed: %s"), strerror(errno));
}
Condvar_impl::~Condvar_impl()
{
if (pthread_cond_destroy(&this->cond_) != 0)
gold_fatal(_("pthread_cond_destroy failed: %s"), strerror(errno));
}
void
Condvar_impl::wait(Lock_impl* li)
{
if (pthread_cond_wait(&this->cond_, &li->mutex_) != 0)
gold_fatal(_("pthread_cond_wait failed: %s"), strerror(errno));
}
void
Condvar_impl::signal()
{
if (pthread_cond_signal(&this->cond_) != 0)
gold_fatal(_("pthread_cond_signal failed: %s"), strerror(errno));
}
#else // !defined(ENABLE_THREADS)
Condvar_impl::Condvar_impl()
{
}
Condvar_impl::~Condvar_impl()
{
}
void
Condvar_impl::wait(Lock_impl* li)
{
gold_assert(li->acquired_);
}
void
Condvar_impl::signal()
{
}
#endif // !defined(ENABLE_THREADS)
// Methods for Condvar class.
Condvar::Condvar(Lock& lock)
: lock_(lock)
{
this->condvar_ = new Condvar_impl;
}
Condvar::~Condvar()
{
delete this->condvar_;
}
void
Condvar::wait()
{
this->condvar_->wait(this->lock_.get_impl());
}
void
Condvar::signal()
{
this->condvar_->signal();
}
} // End namespace gold.
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