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#include <lib/base/elock.h>
#include <unistd.h>
void eLock::lock(int res)
{
if (res>max)
res=max;
pthread_mutex_lock(&mutex);
while ((counter+res)>max)
pthread_cond_wait(&cond, &mutex);
counter+=res;
pthread_mutex_unlock(&mutex);
}
void eLock::unlock(int res)
{
if (res>max)
res=max;
pthread_mutex_lock(&mutex);
counter-=res;
pthread_mutex_unlock(&mutex);
pthread_cond_signal(&cond);
}
eLock::eLock(int max): max(max)
{
pthread_mutex_init(&mutex, 0);
pthread_cond_init(&cond, 0);
counter=0;
pid=-1;
}
eLock::~eLock()
{
pthread_mutex_destroy(&mutex);
pthread_cond_destroy(&cond);
}
eLocker::eLocker(eLock &lock, int res): lock(lock), res(res)
{
lock.lock(res);
}
eLocker::~eLocker()
{
lock.unlock(res);
}
eSemaphore::eSemaphore()
{
v=1;
pthread_mutex_init(&mutex, 0);
pthread_cond_init(&cond, 0);
}
eSemaphore::~eSemaphore()
{
pthread_mutex_destroy(&mutex);
pthread_cond_destroy(&cond);
}
int eSemaphore::down()
{
int value_after_op;
pthread_mutex_lock(&mutex);
while (v<=0)
pthread_cond_wait(&cond, &mutex);
v--;
value_after_op=v;
pthread_mutex_unlock(&mutex);
return value_after_op;
}
int eSemaphore::decrement()
{
int value_after_op;
pthread_mutex_lock(&mutex);
v--;
value_after_op=v;
pthread_mutex_unlock(&mutex);
pthread_cond_signal(&cond);
return value_after_op;
}
int eSemaphore::up()
{
int value_after_op;
pthread_mutex_lock(&mutex);
v++;
value_after_op=v;
pthread_mutex_unlock(&mutex);
pthread_cond_signal(&cond);
return value_after_op;
}
int eSemaphore::value()
{
int value_after_op;
pthread_mutex_lock(&mutex);
value_after_op=v;
pthread_mutex_unlock(&mutex);
return value_after_op;
}
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