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/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2021 Symbiflow Authors.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#ifndef SCOPE_LOCK_H
#define SCOPE_LOCK_H
#include <stdexcept>
#include "nextpnr_namespaces.h"
NEXTPNR_NAMESPACE_BEGIN
// Provides a simple RAII locking object. ScopeLock takes a lock when
// constructed, and releases the lock on destruction or if "unlock_early" is
// called.
//
// LockingObject must have a method "void lock(void)" and "void unlock(void)".
template <typename LockingObject> class ScopeLock
{
public:
ScopeLock(LockingObject *obj) : obj_(obj), locked_(false)
{
obj_->lock();
locked_ = true;
}
ScopeLock(const ScopeLock &other) = delete;
ScopeLock(const ScopeLock &&other) = delete;
~ScopeLock()
{
if (locked_) {
obj_->unlock();
}
}
void unlock_early()
{
if (!locked_) {
throw std::runtime_error("Lock already released?");
}
locked_ = false;
obj_->unlock();
}
private:
LockingObject *obj_;
bool locked_;
};
NEXTPNR_NAMESPACE_END
#endif /* SCOPE_LOCK_H */
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