freebsd kernel with SKQ
fcbd16cf61
global and allocated variables. This strategy is derived from work originally developed by BSDi for BSD/OS, and applied to FreeBSD by Sam Leffler: - Add unp_mtx, a global mutex which will protect all UNIX domain socket related variables, structures, etc. - Add UNP_LOCK(), UNP_UNLOCK(), UNP_LOCK_ASSERT() macros. - Acquire unp_mtx on entering most UNIX domain socket code, drop/re-acquire around calls into VFS, and release it on return. - Avoid performing sodupsockaddr() while holding the mutex, so in general move to allocating storage before acquiring the mutex to copy the data. - Make a stack copy of the xucred rather than copying out while holding unp_mtx. Copy the peer credential out after releasing the mutex. - Add additional assertions of vnode locks following VOP_CREATE(). A few notes: - Use of an sx lock for the file list mutex may cause problems with regard to unp_mtx when garbage collection passed file descriptors. - The locking in unp_pcblist() for sysctl monitoring is correct subject to the unpcb zone not returning memory for reuse by other subsystems (consistent with similar existing concerns). - Sam's version of this change, as with the BSD/OS version, made use of both a global lock and per-unpcb locks. However, in practice, the global lock covered all accesses, so I have simplified out the unpcb locks in the interest of getting this merged faster (reducing the overhead but not sacrificing granularity in most cases). We will want to explore possibilities for improving lock granularity in this code in the future. Submitted by: sam Sponsored by: FreeBSD Foundatiuon Obtained from: BSD/OS 5 snapshot provided by BSDi |
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| bin | ||
| contrib | ||
| crypto | ||
| etc | ||
| games | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
| sbin | ||
| secure | ||
| share | ||
| sys | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| COPYRIGHT | ||
| installworld_newk | ||
| installworld_oldk | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| README | ||
| UPDATING | ||
| UPDATING.64BTT | ||
This is the top level of the FreeBSD source directory. This file was last revised on: $FreeBSD$ For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information). The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree, the most commonly used one being ``world'', which rebuilds and installs everything in the FreeBSD system from the source tree except the kernel, the kernel-modules and the contents of /etc. The ``buildkernel'' and ``installkernel'' targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel is a somewhat more involved process, documentation for which can be found at: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html And in the config(8) man page. Note: If you want to build and install the kernel with the ``buildkernel'' and ``installkernel'' targets, you might need to build world before. More information is available in the handbook. The sample kernel configuration files reside in the sys/<arch>/conf sub-directory (assuming that you've installed the kernel sources), the file named GENERIC being the one used to build your initial installation kernel. The file NOTES contains entries and documentation for all possible devices, not just those commonly used. It is the successor of the ancient LINT file, but in contrast to LINT, it is not buildable as a kernel but a pure reference and documentation file. Source Roadmap: --------------- bin System/user commands. contrib Packages contributed by 3rd parties. crypto Cryptography stuff (see crypto/README). etc Template files for /etc. games Amusements. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. kerberos5 Kerberos5 (Heimdal) package. lib System libraries. libexec System daemons. release Release building Makefile & associated tools. sbin System commands. secure Cryptographic libraries and commands. share Shared resources. sys Kernel sources. tools Utilities for regression testing and miscellaneous tasks. usr.bin User commands. usr.sbin System administration commands. For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html