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pathspinlock.hh
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pathspinlock.hh
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#ifndef CLICK_SIMPLESPINLOCK_HH
#define CLICK_SIMPLESPINLOCK_HH
#include <click/batchelement.hh>
#include <click/sync.hh>
CLICK_DECLS
/*
* =c
* PathSpinlock(LOCK)
* =s threads
* acquires a spinlock, push/pull the packets then release the lock
* =d
* Acquires the spinlock named LOCK. LOCK must be defined in a SpinlockInfo
* element.
* In a push context, the packet is then pushed through the pipeline and when the
* processing down the push path is done, releases the lock.
* In a pull contextn, the pacjet us then pulled and before being returned, the lock is released.
*
* =n
* Ensure that a push path or a pull part will not be traversed by multiple threads at the same
* time while SpinlockAcquire/SpinlockRelease work for any path but do not
* support dropping packets between a SpinlockAcquire and a SpinlockRelease
*
* =a SpinlockInfo, SpinlockAcquire, SpinlockRelease
*/
class PathSpinlock : public BatchElement { public:
PathSpinlock() : _lock(0) {}
~PathSpinlock() {}
const char *class_name() const override { return "PathSpinlock"; }
const char *port_count() const override { return "1-/="; }
const char *processing() const override { return AGNOSTIC; }
int configure(Vector<String> &, ErrorHandler *) CLICK_COLD;
void push(int,Packet *p) override;
Packet* pull(int) override;
#if HAVE_BATCH
void push_batch(int,PacketBatch *p) override;
PacketBatch* pull_batch(int,unsigned) override;
#endif
private:
bool _lock_release;
Spinlock *_lock;
};
CLICK_ENDDECLS
#endif