commit | d09758461c2a15a8216d2400c89386e2882ed711 | [log] [tgz] |
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author | Aaron Green <aarongreen@google.com> | Fri Mar 09 14:49:54 2018 -0800 |
committer | CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> | Fri Mar 16 18:20:01 2018 +0000 |
tree | b3f6738d864b6c7faded3de2f46013f977eac7b5 | |
parent | 37331e6765e6283bd34240f6e096ea934f0fed15 [diff] |
[bitmap] Add reverse scanning This CL adds RScan and RFind to complement Scan and Find, respectively. The functions find the last occurences of a non-matching bit or run of matching bits, instead of the first. The interface for Scan and Find has also slightly changed: while returning "bitmax" made some sense on failure before, returning "bitoff" doesn't for the reverse versions since it would be a valid offset. Returning "bitoff-1" is similarly problematic, as bitoff may be 0. Instead, Scan now returns a bool, and Find does not set "out" in their respective failure cases. ZX-1781 #comment Fixed Change-Id: Ied08f8c74bca17e7b537d16075a2005e00d536fc
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.