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// metal-fence.cpp
#include "metal-fence.h"
#include "metal-device.h"
namespace gfx
{
using namespace Slang;
namespace metal
{
FenceImpl::~FenceImpl() {}
Result FenceImpl::init(DeviceImpl* device, const IFence::Desc& desc)
{
m_device = device;
m_event = NS::TransferPtr(m_device->m_device->newSharedEvent());
if (!m_event)
{
return SLANG_FAIL;
}
m_event->setSignaledValue(desc.initialValue);
m_eventListener = NS::TransferPtr(MTL::SharedEventListener::alloc()->init());
if (!m_eventListener)
{
return SLANG_FAIL;
}
return SLANG_OK;
}
Result FenceImpl::getCurrentValue(uint64_t* outValue)
{
*outValue = m_event->signaledValue();
return SLANG_OK;
}
Result FenceImpl::setCurrentValue(uint64_t value)
{
m_event->setSignaledValue(value);
return SLANG_OK;
}
Result FenceImpl::getSharedHandle(InteropHandle* outHandle)
{
return SLANG_E_NOT_AVAILABLE;
}
Result FenceImpl::getNativeHandle(InteropHandle* outNativeHandle)
{
outNativeHandle->api = InteropHandleAPI::Metal;
outNativeHandle->handleValue = reinterpret_cast<intptr_t>(m_event.get());
return SLANG_OK;
}
bool FenceImpl::waitForFence(uint64_t value, uint64_t timeout)
{
// Create a semaphore to synchronize the notification
dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
// Create and store the notification block
MTL::SharedEventNotificationBlock block = ^(MTL::SharedEvent* event, uint64_t eventValue) {
dispatch_semaphore_signal(semaphore);
};
// Set up notification handler
m_event->notifyListener(m_eventListener.get(), value, block);
// Wait for the notification or timeout
if (timeout & (1LLU << 63))
{
timeout = DISPATCH_TIME_FOREVER;
}
else
{
timeout = dispatch_time(DISPATCH_TIME_NOW, timeout);
}
long result = dispatch_semaphore_wait(semaphore, timeout);
dispatch_release(semaphore);
return result == 0;
}
} // namespace metal
} // namespace gfx
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