Add an explicit transition to D3D12_RESOURCE_STATE_EXCLUSIVE_WRITE (custom state) or ensure proper state promotion:
D3D12_RESOURCE_BARRIER barrier = {};
barrier.Type = D3D12_RESOURCE_BARRIER_TYPE_TRANSITION;
barrier.Transition.pResource = pMyBuffer;
barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_COMMON;
barrier.Transition.StateAfter = D3D12_RESOURCE_STATE_COPY_DEST;
barrier.Transition.Subresource = D3D12_RESOURCE_BARRIER_ALL_SUBRESOURCES;
commandList->ResourceBarrier(1, &barrier);
CDX stands for Compound Index. In Visual FoxPro, a CDX file is a structural index file that accompanies a database table (.DBF file). While the DBF holds the raw data (rows and columns), the CDX file holds one or more indexes that allow the database to:
Without a valid CDX file, the database engine cannot locate records in sorted order or use optimized lookups. cdx error 0x3 1 exclusive
Antivirus real-time scanners and backup agents sometimes lock .CDX files while scanning or copying. Since error 0x3 occurs especially with exclusive access, any external lock will cause the VFP engine to fail.
If error appears only in PIX/RenderDoc but not in production: CDX stands for Compound Index
If you are reading this, you have likely encountered a frustrating pop-up error message while trying to access a database, run a report, or open an application. The error typically reads:
"CDX error 0x3 (1 exclusive)"
For the uninitiated, this error seems cryptic and technical. However, for those who work with Microsoft Visual FoxPro (VFP) databases or applications that rely on VFP’s native indexing system (.CDX files), this is a well-known—if often misunderstood—error.
This article will dissect the error in plain language, explore its root causes, and provide step-by-step troubleshooting and resolution methods. By the end, you will not only fix the error but also understand how to prevent it from recurring. Without a valid CDX file, the database engine
Report ID: CDX-ERR-0x3-1-EXCL
Date: [Current Date]
Severity: Medium (Application/Driver Level)
Affected Systems: Windows 10/11, DirectX 12 applications, graphics debugging tools (PIX, RenderDoc), GPU drivers (NVIDIA, AMD, Intel).
// Queue A finishes
queueA->Signal(fence, 100);
// Queue B waits
queueB->Wait(fence, 100);
Before attempting fixes, diagnose the environment systematically.