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Now that the infrastructure of the Graphics subsystem is quite stable, it is time to try to fix a long-standing problem, which is the lack of locking on display connector devices. Reading and writing from multiple processes to a framebuffer controlled by the display connector is not a huge problem - it could be solved with POSIX locking. The real problem is some program that will try to do ioctl operations on a display connector without the WindowServer being aware of that which can lead to very bad situations, for example - assuming a framebuffer is encoded at a known resolution and certain display timings, but another process changed the ModeSetting of the display connector, leading to inconsistency on the properties of the current ModeSetting. To solve this, there's a new "master" ioctl to take "ownership" and another one to release that ownership of a display connector device. To ensure we will not hold a Process object forever just because it has an ownership over a display connector, we hold it with a weak reference, and if the process is gone, someone else can take an ownership. |
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| .. | ||
| Bochs | ||
| Console | ||
| Generic | ||
| Intel | ||
| VirtIOGPU | ||
| VMWare | ||
| Definitions.h | ||
| DisplayConnector.cpp | ||
| DisplayConnector.h | ||
| GenericGraphicsAdapter.h | ||
| GraphicsManagement.cpp | ||
| GraphicsManagement.h | ||