operation-blocker.h

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// SPDX-License-Identifier: GPL-2.0-or-later
 
#ifndef SEEN_OPERATION_BLOCKER_H
#define SEEN_OPERATION_BLOCKER_H
 
// cooperative counter-based pending operation blocking
 
class OperationBlocker {
public:
    OperationBlocker() = default;
    
    bool pending() const {
        return _counter > 0;
    }
 
    class scoped_block {
    public:
        scoped_block(unsigned int& counter): _c(counter) {
            ++_c;
        }
 
        ~scoped_block() {
            --_c;
        }
 
    private:
        unsigned int& _c;
    };
 
    [[nodiscard]] scoped_block block() {
        return scoped_block(_counter);
    }
 
private:
    unsigned int _counter = 0;
};
 
#endif