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#include "stdafx.h"
#include "Future.h"
#include "CloneEnv.h"
#include "Exception.h"
#include "Utils/Memory.h"
namespace storm {
FutureBase::FutureBase(const Handle &type) : data(null), noClone(false) {
GcArray<byte> *result = (GcArray<byte> *)runtime::allocArray(engine(), type.gcArrayType, 1);
data = new (runtime::allocStaticRaw(engine(), &Data::gcType.type)) Data(type, result);
}
FutureBase::FutureBase(const FutureBase &o) : data(o.data), noClone(o.noClone) {
data->addRef();
}
FutureBase::~FutureBase() {
data->release();
}
void FutureBase::deepCopy(CloneEnv *env) {
// We need to clone the result now that we have been cloned.
noClone = false;
}
void FutureBase::setNoClone() {
noClone = true;
}
void FutureBase::postRaw(const void *value) {
// Do not post multiple times.
if (atomicCAS(data->result->filled, 0, 1) == 0) {
data->handle->safeCopy(data->result->v, value);
if (!noClone && data->handle->deepCopyFn) {
CloneEnv *e = new (this) CloneEnv();
(*data->handle->deepCopyFn)(data->result->v, e);
}
data->future.posted();
} else {
WARNING(L"Trying to re-use a future!");
}
}
void FutureBase::error() {
if (atomicCAS(data->result->filled, 0, 1) == 0) {
data->future.error();
} else {
WARNING(L"Trying to re-use a future!");
}
}
void FutureBase::error(Exception *exception) {
try {
exception->throwMe();
} catch (...) {
error();
}
}
os::PtrThrowable *updateFutureExceptions(os::PtrThrowable *src, void *) {
Object *o = dynamic_cast<Object *>(src);
if (!o)
return src;
Object *cloned = clone(o);
if (Exception *e = as<Exception>(cloned)) {
if (e->stackTrace.any()) {
appendStackTrace(e->stackTrace, 4);
}
}
return cloned;
}
void FutureBase::resultRaw(void *to) {
data->future.result(&updateFutureExceptions, null);
data->handle->safeCopy(to, data->result->v);
if (!noClone && data->handle->deepCopyFn) {
CloneEnv *e = new (this) CloneEnv();
(*data->handle->deepCopyFn)(to, e);
}
}
void FutureBase::errorResult() {
data->future.result(&updateFutureExceptions, null);
}
void FutureBase::detach() {
data->future.detach();
}
os::FutureBase *FutureBase::rawFuture() {
if (atomicCAS(data->releaseOnResult, 0, 1) == 0)
data->addRef();
return &data->future;
}
FutureBase::FutureNotify::FutureNotify() : os::FutureBase() {}
void FutureBase::FutureNotify::notify() {
os::FutureBase::notify();
Data::resultPosted(this);
}
const GcTypeStore<3> FutureBase::Data::gcType = {
{
GcType::tFixed,
null,
&FutureBase::Data::finalize,
sizeof(FutureBase::Data),
3,
// First pointer offset.
{ OFFSET_OF(FutureBase::Data, future.ptrException) }
},
// Remaining two pointer offsets.
{
OFFSET_OF(FutureBase::Data, handle),
OFFSET_OF(FutureBase::Data, result),
}
};
FutureBase::Data::Data(const Handle &type, GcArray<byte> *result)
: handle(&type), result(result), refs(1), releaseOnResult(0) {}
FutureBase::Data::~Data() {}
void FutureBase::Data::addRef() {
atomicIncrement(refs);
}
void FutureBase::Data::release() {
if (atomicDecrement(refs) == 0)
this->~Data();
}
void FutureBase::Data::resultPosted(FutureNotify *sema) {
Data *me = BASE_PTR(Data, sema, future);
if (atomicCAS(me->releaseOnResult, 1, 0) == 1)
me->release();
}
void FutureBase::Data::finalize(void *object, os::Thread *) {
// If the refcount is larger than one, someone forgot to update the refcount, and we need to
// call the destructor.
Data *d = static_cast<Data *>(object);
if (atomicRead(d->refs) != 0)
d->~Data();
}
}
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