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#include "pthreadx.h"
#include "xmlrpc-c/girerr.hpp"
using girerr::error;
#include "xmlrpc-c/girmem.hpp"
using namespace std;
using namespace girmem;
namespace girmem {
void
autoObject::incref() {
pthread_mutex_lock(&this->refcountLock);
++this->refcount;
pthread_mutex_unlock(&this->refcountLock);
}
void
autoObject::decref(bool * const unreferencedP) {
if (this->refcount == 0)
throw(error("Decrementing ref count of unreferenced object"));
pthread_mutex_lock(&this->refcountLock);
--this->refcount;
*unreferencedP = (this->refcount == 0);
pthread_mutex_unlock(&this->refcountLock);
}
autoObject::autoObject() {
int rc;
rc = pthread_mutex_init(&this->refcountLock, NULL);
if (rc != 0)
throw(error("Unable to initialize pthread mutex"));
this->refcount = 0;
}
autoObject::~autoObject() {
if (this->refcount > 0)
throw(error("Destroying referenced object"));
int rc;
rc = pthread_mutex_destroy(&this->refcountLock);
if (rc != 0)
throw(error("Unable to destroy pthread mutex"));
}
autoObjectPtr::autoObjectPtr() : objectP(NULL) {}
autoObjectPtr::autoObjectPtr(autoObject * const objectP) {
// Note: When someone attempts to use this constructor with a null
// argument, it's normally because a 'new' of the autoObject
// failed, before calling the autoObject's constructor, thus
// generating a null pointer.
// E.g. the following code, where the system is out of memory:
//
// class client : public autoObject { ... }
// class clientPtr : public autoObjectPtr { ... }
// clientPtr clientP(new client);
if (objectP == NULL)
throw(error("Object creation failed; trying to create autoObjectPtr "
"with a null autoObject pointer"));
this->objectP = objectP;
objectP->incref();
}
autoObjectPtr::autoObjectPtr(autoObjectPtr const& autoObjectPtr) {
// copy constructor
this->objectP = autoObjectPtr.objectP;
if (this->objectP)
this->objectP->incref();
}
autoObjectPtr::~autoObjectPtr() {
this->unpoint();
}
void
autoObjectPtr::point(autoObject * const objectP) {
if (this->objectP != NULL)
throw(error("Already pointing"));
this->objectP = objectP;
objectP->incref();
}
void
autoObjectPtr::unpoint() {
if (this->objectP) {
bool dead;
this->objectP->decref(&dead);
if (dead) {
delete(this->objectP);
this->objectP = NULL;
}
}
}
autoObjectPtr
autoObjectPtr::operator=(autoObjectPtr const& source) {
// If we're overwriting a variable that already points to something,
// we have to unpoint it from what it points to now before we can point
// it to what 'source' points to. But if the source and destination
// are the same object, we just want to leave the pointing alone.
if (this == &source) {
// Assignment of variable to itself; no-op
} else {
this->unpoint();
this->objectP = source.objectP;
if (this->objectP)
this->objectP->incref();
}
return *this;
}
autoObject *
autoObjectPtr::operator->() const {
if (this->objectP == NULL)
throw(error("attempt to dereference autoObjectPtr "
"which does not point to anything"));
return this->objectP;
}
autoObject *
autoObjectPtr::get() const {
return this->objectP;
}
} // namespace
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