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performance result on my machine:
mutex Elapsed: 902115 us; per iteration: 90 ns.
semaphore Elapsed: 958780 us; per iteration: 95 ns.
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now type sema_t is a structure which can be put in a shared memory area,
and multiple processes can operate it concurrently.
User can either use mmap(MAP_SHARED) + sem_init(pshared=1) or use sem_open()
to initialize a shared semaphore.
Named semaphore uses file system and is located in /tmp directory, and its
file name is prefixed with 'SEMD', so now it is chroot or jail friendly.
In simplist cases, both for named and un-named semaphore, userland code
does not have to enter kernel to reduce/increase semaphore's count.
The semaphore is designed to be crash-safe, it means even if an application
is crashed in the middle of operating semaphore, the semaphore state is
still safely recovered by later use, there is no waiter counter maintained
by userland code.
The main semaphore code is in libc and libthr only has some necessary stubs,
this makes it possible that a non-threaded application can use semaphore
without linking to thread library.
Old semaphore implementation is kept libc to maintain binary compatibility.
The kernel ksem API is no longer used in the new implemenation.
Discussed on: threads@
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Std 1003.1-2008. Both Linux and Solaris conforms to the new definitions,
so we better follow too (older glibc used old BSDish alphasort prototype
and corresponding type of the comparision function for scandir). While
there, change the definitions of the functions to ANSI C and fix several
style issues nearby.
Remove requirement for "sys/types.h" include for functions from manpage.
POSIX also requires that alphasort(3) sorts as if strcoll(3) was used,
but leave the strcmp(3) call in the function for now.
Adapt in-tree callers of scandir(3) to new declaration. The fact that
select_sections() from catman(1) could modify supplied struct dirent is
a bug.
PR: standards/142255
MFC after: 2 weeks
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MFC after: 1 week
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Similar to libexec/, do the same with lib/. Make WARNS=6 the norm and
lower it when needed.
I'm setting WARNS?=0 for secure/. It seems secure/ includes the
Makefile.inc provided by lib/. I'm not going to touch that directory.
Most of the code there is contributed anyway.
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r195175. Remove all definitions, documentation, and usage.
fifo_misc.c:
Remove all kqueue tests as fifo_io.c performs all those that
would have remained.
Reviewed by: rwatson
MFC after: 3 weeks
X-MFC note: don't change vlan_link_state() function signature
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the results of gmtime() instead of using a pthread mutex directly.
MFC after: 1 week
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libarchive.googlecode.com
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you can do things like this: tar xvf archive.tar.gz.uu
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In particular, this includes tests for the new features I've merged
over the last few days.
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from googlecode:
* Support for zisofs compressed entries
* Support for relocated deep directories
* Direct calculation of link counts for accurate nlink values
even on images that lack Rockridge extensions
* Faster handling of the internal file lists.
* Better detection of ISO variants
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Submitted by: Valentin Nechayev <netch segfault kiev ua>
MFC after: 3 days
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Based on submission by: pluknet gmail com
MFC after: 3 days
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implementation of time(3). CLOCK_SECOND is much faster.
No objections from: phk
Submitted by: Valentin Nechayev <netch segfault kiev ua>
MFC after: 1 week
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archives by generating synthetic ino values and mapping values
from disk into the new values.
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The initial implementation was developed by Anselm Strauss as part of
Google Summer of Code 2008, then completed by Joerg Sonnenberger.
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1<<30 bytes of memory, which is required for some streams.
Also, try to make the taster more discriminating about raw lzma streams.
The detection here is still really weak, though; please use xz instead
of lzma.
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mtree files.
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This eliminates some false-positives in the hardlink detection logic.
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* Use ino64 where appropriate
* Don't pass atime or nsec to ustar formatter
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For portability, prefer int64_t to off_t.
Improve numeric overflow handling when parsing.
Fix some variable types.
Eliminate some unused results.
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* Warn about truncation of ino
* Use a macro to hide the somewhat obscure pad-to-multiple-of-4 calculation
* Eliminate some unused variables
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* Write xattrs last instead of first (required on platforms that use
system xattrs for security attributes)
* Better handling of chdir() failures
* Don't bother trying to shorten files via seek()/write()
* Fix build on systems that lack link()/symlink()/mknod()
* Prefer futimens()/utimensat() when they're present
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immediate feedback if we fail to fork an external decompression program.
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* Enforce option interface can only be used before the archive is opened
* Correctly handle large skips on platforms with 32-bit off_t
* Use int64_t instead of off_t
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Fix some wrong usages.
Note: this does not affect generated binaries as this argument is not used.
PR: 137213
Submitted by: Eygene Ryabinkin (initial version)
MFC after: 1 month
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Submitted by: Kenyon Ralph <kenyon kenyonralph com>
MFC after: 1 week
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to find it there. Unfortunately this reintroduces the dependency
on ip_fw_pfil.c
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platforms that lack zlib.
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