| commit | 5b017d01283c9d576f8ccf6a08a21f97b2964d60 | [log] [tgz] |
|---|---|---|
| author | David Stevens <stevensd@google.com> | Fri Sep 21 17:25:11 2018 -0700 |
| committer | CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> | Sat Sep 22 01:49:11 2018 +0000 |
| tree | a6c3d7af84b9216b4926106893b05b559cc94a91 | |
| parent | bf3ac278d389c8e0de5eba2e80b88cd81e3c90c8 [diff] |
[virtcon] Don't update framebuffer with no display This change reduces how much work the virtcon does when it doesn't have ownership of the display. First, add checks for ownership to all checks for the presence of a display (i.e. vc_gfx being non-null), so we treat not having ownership the same as not having a framebuffer to render to. Second, add ownership checks to all checks for vc->active, so we treat not having ownership as all virtcons being inactive. Test: Check that output during no display appears when focus is gained Change-Id: Ib8ca77b0c9a104131bd37756878b30f7136c1b38
Zircon is the core platform that powers the Fuchsia OS. Zircon is composed of a microkernel (source in kernel/...) as well as a small set of userspace services, drivers, and libraries (source in system/...) necessary for the system to boot, talk to hardware, load userspace processes and run them, etc. Fuchsia builds a much larger OS on top of this foundation.
The canonical Zircon Git repository is located at: https://fuchsia.googlesource.com/zircon
A read-only mirror of the code is present at: https://github.com/fuchsia-mirror/zircon
The Zircon Kernel provides syscalls to manage processes, threads, virtual memory, inter-process communication, waiting on object state changes, and locking (via futexes).
Currently there are some temporary syscalls that have been used for early bringup work, which will be going away in the future as the long term syscall API/ABI surface is finalized. The expectation is that there will be about 100 syscalls.
Zircon syscalls are generally non-blocking. The wait_one, wait_many port_wait and thread sleep being the notable exceptions.
This page is a non-comprehensive index of the zircon documentation.