I've programmed a streaming texture with the Map method. It works ok with mapFlags set to 0.

Now i'm trying to optimize it with D3D11_MAP_FLAG_DO_NOT_WAIT

But cannot make it work, the map() method returns error code E_INVALIDARG = 0x80070057

Here is how i call map function:

        // update texture
	D3D11_MAPPED_SUBRESOURCE sub;
	HRESULT hr = pImmediateContext->Map(s_pTexture, 0, D3D11_MAP_WRITE_DISCARD, /*D3D11_MAP_FLAG_DO_NOT_WAIT*/ 0 , &sub);
	if ( SUCCEEDED( hr ) ) {
		memcpy(sub.pData,screen,512*512*4);
		pImmediateContext->Unmap(s_pTexture,0);
	} else {
		if ( hr == D3DERR_WASSTILLDRAWING ) OutputDebugString("D3DERR_WASSTILLDRAWING");	
		char c[256];
		wsprintf(c,"error 0x%x ", hr);
		OutputDebugString(c);
	}

And the texture creation :

	// Create the texture
	D3D11_TEXTURE2D_DESC desc;
	ZeroMemory(&desc,sizeof(desc));
	desc.Width = 512;
	desc.Height = 512;
	desc.MipLevels = 1;
	desc.ArraySize = 1;
	desc.Format = DXGI_FORMAT_B8G8R8X8_UNORM;
	desc.SampleDesc.Count = 1;
	desc.Usage = D3D11_USAGE_DYNAMIC;
	desc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
	desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
	desc.MiscFlags = 0;
	pd3dDevice->CreateTexture2D( &desc, NULL, &s_pTexture );

The documentation for D3D11_MAP_FLAG states that D3D11_MAP_FLAG_DO_NOT_WAIT cannot be used with D3D11_MAP_WRITE_DISCARD. It sounds like you really just want to use D3D11_MAP_WRITE_DISCARD. This will cause a new block of memory to be allocated when you map the buffer, and you can copy your texture data into that directly without worrying about whether the GPU is accessing the texture.

That's true, thanks for the doc...

But i've tried with D3D11_MAP_WRITE flag, i still returns an error 0x80070057 ...