old-cross-binutils/gold/gold-threads.h

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2006-08-04 23:10:59 +00:00
// gold-threads.h -- thread support for gold -*- C++ -*-
// gold can be configured to support threads. If threads are
// supported, the user can specify at runtime whether or not to
// support them. This provides an interface to manage locking
// accordingly.
// Lock
// A simple lock class.
#ifndef GOLD_THREADS_H
#define GOLD_THREADS_H
namespace gold
{
class Lock_impl;
class Condvar;
// A simple lock class.
class Lock
{
public:
Lock();
~Lock();
// Acquire the lock.
void
acquire();
// Release the lock.
void
release();
private:
// This class can not be copied.
Lock(const Lock&);
Lock& operator=(const Lock&);
friend class Condvar;
Lock_impl*
get_impl() const
{ return this->lock_; }
Lock_impl* lock_;
};
// RAII for Lock.
class Hold_lock
{
public:
Hold_lock(Lock& lock)
: lock_(lock)
{ this->lock_.acquire(); }
~Hold_lock()
{ this->lock_.release(); }
private:
// This class can not be copied.
Hold_lock(const Hold_lock&);
Hold_lock& operator=(const Hold_lock&);
Lock& lock_;
};
class Condvar_impl;
// A simple condition variable class. It is always associated with a
// specific lock.
class Condvar
{
public:
Condvar(Lock& lock);
~Condvar();
// Wait for the condition variable to be signalled. This should
// only be called when the lock is held.
void
wait();
// Signal the condition variable. This should only be called when
// the lock is held.
void
signal();
private:
// This class can not be copied.
Condvar(const Condvar&);
Condvar& operator=(const Condvar&);
Lock& lock_;
Condvar_impl* condvar_;
};
} // End namespace gold.
#endif // !defined(GOLD_THREADS_H)