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#include "ReadWriteLock.hpp"
namespace nbody {
ReadWriteLock::ReadWriteLock() {
pthread_mutex_init(&this->mutex, NULL);
pthread_rwlock_init(&this->rwlock, NULL);
this->owner = NULL;
}
ReadWriteLock::~ReadWriteLock() {
pthread_mutex_destroy(&this->mutex);
pthread_rwlock_destroy(&this->rwlock);
}
bool ReadWriteLock::readLock(pthread_t* myThread) {
bool result;
pthread_mutex_lock(&this->mutex);
result = (pthread_rwlock_tryrdlock(&this->rwlock) == 0);
if (result) {
this->owner = myThread;
}
pthread_mutex_unlock(&this->mutex);
return result;
}
bool ReadWriteLock::writeLock(pthread_t* myThread) {
bool result;
pthread_mutex_lock(&this->mutex);
result = (pthread_rwlock_trywrlock(&this->rwlock) == 0);
if (result) {
this->owner = myThread;
}
pthread_mutex_unlock(&this->mutex);
return result;
}
bool ReadWriteLock::upgradeToWriteLock(pthread_t* myThread) {
bool result = false;
pthread_mutex_lock(&this->mutex);
if (this->owner == myThread) {
pthread_rwlock_unlock(&this->rwlock);
pthread_rwlock_wrlock(&this->rwlock);
result = true;
}
pthread_mutex_unlock(&this->mutex);
return result;
}
bool ReadWriteLock::downgradeToReadLock(pthread_t* myThread) {
bool result = false;
pthread_mutex_lock(&this->mutex);
if (this->owner == myThread) {
pthread_rwlock_unlock(&this->rwlock);
pthread_rwlock_rdlock(&this->rwlock);
result = true;
}
pthread_mutex_unlock(&this->mutex);
return result;
}
bool ReadWriteLock::unLock(pthread_t* myThread) {
bool result = false;
pthread_mutex_lock(&this->mutex);
if (this->owner == myThread) {
pthread_rwlock_unlock(&this->rwlock);
this->owner = NULL;
result = true;
}
pthread_mutex_unlock(&this->mutex);
return result;
}
}