Class FilesystemLock

Kernel/include/lock.h:11–49

#include <logging.h>

class FilesystemLock {
    unsigned activeReaders = 0;
    lock_t fileLock = 0;

    FastList<thread*> readers;
    FastList<thread*> writers;
public:
    lock_t lock = 0;

    FilesystemLock() {}

    void AcquireRead(){
        acquireLock(&lock);

        activeReaders++;

        if(activeReaders == 1){
            acquireLock(&fileLock);
        }

        releaseLock(&lock);
    }

    void AcquireWrite(){
        acquireLock(&fileLock);
    }

    void ReleaseRead(){
        if(activeReaders == 1){
            releaseLock(&fileLock);
        }

        activeReaders--;
    }

    void ReleaseWrite(){
        releaseLock(&fileLock);
    }
};

class Semaphore : public Scheduler::GenericThreadBlocker{
protected: