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lock_server.cc
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lock_server.cc
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// the lock server implementation
#include "lock_server.h"
#include <sstream>
#include <stdio.h>
#include <unistd.h>
#include <arpa/inet.h>
lock_server::lock_server():
nacquire (0)
{
pthread_mutex_init(&mutex, NULL);
}
lock_protocol::status
lock_server::stat(int clt, lock_protocol::lockid_t lid, int &r)
{
lock_protocol::status ret = lock_protocol::OK;
printf("stat request from clt %d\n", clt);
r = nacquire;
return ret;
}
lock_protocol::status
lock_server::acquire(int clt, lock_protocol::lockid_t lid, int &r)
{
lock_protocol::status ret = lock_protocol::OK;
printf("lock_server: acquire %lld\n", lid);
// Your lab2 part2 code goes here
pthread_mutex_lock(&mutex);
if(locks.find(lid) == locks.end()){
pthread_cond_t cond;
pthread_cond_init(&cond, NULL);
conds[lid] = cond;
} else if (locks[lid]) {
while(locks[lid])
pthread_cond_wait(&conds[lid], &mutex);
}
locks[lid] = true;
pthread_mutex_unlock(&mutex);
r = ret;
return ret;
}
lock_protocol::status
lock_server::release(int clt, lock_protocol::lockid_t lid, int &r)
{
lock_protocol::status ret = lock_protocol::OK;
printf("lock_server: release %lld\n", lid);
// Your lab2 part2 code goes here
pthread_mutex_lock(&mutex);
locks[lid] = false;
pthread_cond_signal(&conds[lid]);
pthread_mutex_unlock(&mutex);
r = ret;
return ret;
}