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lock_client_cache.h
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lock_client_cache.h
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// lock client interface.
#ifndef lock_client_cache_h
#define lock_client_cache_h
#include <string>
#include "lock_protocol.h"
#include "rpc.h"
#include "lock_client.h"
#include "lang/verify.h"
#include <pthread.h>
#include <map>
#include "threaded_queue.h"
#include <time.h>
// Classes that inherit lock_release_user can override dorelease so that
// that they will be called when lock_client releases a lock.
// You will not need to do anything with this class until Lab 5.
class lock_release_user {
public:
virtual void dorelease(lock_protocol::lockid_t) = 0;
virtual ~lock_release_user() {};
};
class lock_client_cache : public lock_client {
private:
class lock_release_user *lu;
int rlock_port;
std::string hostname;
std::string id;
enum state{
FREE = 0x2001,
LOCKED,
UNK,
REL,
ACQ,
IDLE
};
//struct for lock_info
struct lock_entry{
state local_state;
state rpc_state;
int waiting;
pthread_cond_t cond;
lock_entry(){
local_state = UNK;
rpc_state = IDLE;
waiting = 0;
pthread_cond_init (&cond, NULL);
}
};
enum rpc_enum{ ACQUIRE, RELEASE };
struct rpc_call{
rpc_enum rpc;
lock_protocol::lockid_t lock_id;
};
threaded_queue<rpc_call> rpc_queue;
std::map<lock_protocol::lockid_t,lock_entry> lock_map;
pthread_mutex_t mu;
//for reducing the number of aqcuire rpcs
pthread_cond_t a_cond;
bool releasing;
long delay;
struct timespec tp;
public:
static int last_port;
lock_client_cache(std::string xdst, class lock_release_user *l = 0);
virtual ~lock_client_cache() {};
lock_protocol::status acquire(lock_protocol::lockid_t);
lock_protocol::status release(lock_protocol::lockid_t);
rlock_protocol::status revoke_handler(lock_protocol::lockid_t,
int &);
rlock_protocol::status retry_handler(lock_protocol::lockid_t,bool wait,
int &);
void outgoing();
};
void* dedicated(void* lock_cc);
#endif