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OPNsense - FreeBSD source
e6f0183bff
They provided little benefit (if any) and they caused some problems in OpenOffice, at least in post-KSE -current and perhaps in other environments too. The nanosleep calls prevented the profiling timer from advancing during the spinloops, thereby preventing the thread scheduler from ever pre-empting the spinning thread. Alexander Kabaev diagnosed this problem, Martin Blapp helped with testing, and Matt Dillon provided some helpful suggestions. This is a short-term fix for a larger problem. The use of spinlocking isn't guaranteed to work in all cases. For example, if the spinning thread has higher priority than all other threads, it may never be pre-empted, and the thread holding the lock may never progress far enough to release the lock. On the other hand, spinlocking is the only locking that can work with an arbitrary unknown threads package. I have some ideas for a much better fix in the longer term. It would eliminate all locking inside the dynamic linker by making it safe for symbol lookups and lazy binding to proceed in parallel with a call to dlopen or dlclose. This means that the only mutual exclusion needed would be to prevent multiple simultaneous calls to dlopen and/or dlclose. That mutual exclusion could be put into the native pthreads library. Applications using foreign threads packages would have to make their own arrangements to ensure that they did not have multiple threads in dlopen and/or dlclose -- a reasonable requirement in my opinion. MFC after: 3 days |
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| bin | ||
| contrib | ||
| crypto | ||
| etc | ||
| games | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| kerberosIV | ||
| lib | ||
| libexec | ||
| release | ||
| sbin | ||
| secure | ||
| share | ||
| sys | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| COPYRIGHT | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| Makefile.upgrade | ||
| README | ||
| UPDATING | ||
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/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. kerberosIV KerberosIV (eBones) 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/handbook/synching.html