#, fuzzy
msgid ""
msgstr ""
"Project-Id-Version: man-pages-l10n VERSION\n"
"POT-Creation-Date: 2014-07-17 17:57+0900\n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"

#. type: TH
#: man-pages/man7/sem_overview.7:26
#, no-wrap
msgid "SEM_OVERVIEW"
msgstr ""

#. type: TH
#: man-pages/man7/sem_overview.7:26
#, no-wrap
msgid "2012-05-13"
msgstr ""

#. type: TH
#: man-pages/man7/sem_overview.7:26
#, no-wrap
msgid "Linux"
msgstr ""

#. type: TH
#: man-pages/man7/sem_overview.7:26
#, no-wrap
msgid "Linux Programmer's Manual"
msgstr ""

#. type: SH
#: man-pages/man7/sem_overview.7:27
#, no-wrap
msgid "NAME"
msgstr ""

#. type: Plain text
#: man-pages/man7/sem_overview.7:29
msgid "sem_overview - overview of POSIX semaphores"
msgstr ""

#. type: SH
#: man-pages/man7/sem_overview.7:29
#, no-wrap
msgid "DESCRIPTION"
msgstr ""

#. type: Plain text
#: man-pages/man7/sem_overview.7:31
msgid ""
"POSIX semaphores allow processes and threads to synchronize their actions."
msgstr ""

#. type: Plain text
#: man-pages/man7/sem_overview.7:41
msgid ""
"A semaphore is an integer whose value is never allowed to fall below zero.  "
"Two operations can be performed on semaphores: increment the semaphore value "
"by one (B<sem_post>(3)); and decrement the semaphore value by one "
"(B<sem_wait>(3)).  If the value of a semaphore is currently zero, then a "
"B<sem_wait>(3)  operation will block until the value becomes greater than "
"zero."
msgstr ""

#. type: Plain text
#: man-pages/man7/sem_overview.7:44
msgid ""
"POSIX semaphores come in two forms: named semaphores and unnamed semaphores."
msgstr ""

#. type: TP
#: man-pages/man7/sem_overview.7:44
#, no-wrap
msgid "B<Named semaphores>"
msgstr ""

#.  glibc allows the initial slash to be omitted, and makes
#.  multiple initial slashes equivalent to a single slash.
#.  This differs from the implementation of POSIX message queues.
#.  glibc allows subdirectory components in the name, in which
#.  case the subdirectory tree must exist under /dev/shm, and
#.  the fist subdirectory component must exist as the name
#.  sem.name, and all of the subdirectory components must allow the
#.  required permissions if a user wants to create a semaphore
#.  object in a subdirectory.
#. type: Plain text
#: man-pages/man7/sem_overview.7:64
msgid ""
"A named semaphore is identified by a name of the form I</somename>; that is, "
"a null-terminated string of up to B<NAME_MAX>I<-4> (i.e., 251) characters "
"consisting of an initial slash, followed by one or more characters, none of "
"which are slashes.  Two processes can operate on the same named semaphore by "
"passing the same name to B<sem_open>(3)."
msgstr ""

#. type: Plain text
#: man-pages/man7/sem_overview.7:79
msgid ""
"The B<sem_open>(3)  function creates a new named semaphore or opens an "
"existing named semaphore.  After the semaphore has been opened, it can be "
"operated on using B<sem_post>(3)  and B<sem_wait>(3).  When a process has "
"finished using the semaphore, it can use B<sem_close>(3)  to close the "
"semaphore.  When all processes have finished using the semaphore, it can be "
"removed from the system using B<sem_unlink>(3)."
msgstr ""

#. type: TP
#: man-pages/man7/sem_overview.7:79
#, no-wrap
msgid "B<Unnamed semaphores (memory-based semaphores)>"
msgstr ""

#. type: Plain text
#: man-pages/man7/sem_overview.7:94
msgid ""
"An unnamed semaphore does not have a name.  Instead the semaphore is placed "
"in a region of memory that is shared between multiple threads (a I<thread-"
"shared semaphore>)  or processes (a I<process-shared semaphore>).  A thread-"
"shared semaphore is placed in an area of memory shared between the threads "
"of a process, for example, a global variable.  A process-shared semaphore "
"must be placed in a shared memory region (e.g., a System V shared memory "
"segment created using B<shmget>(2), or a POSIX shared memory object built "
"created using B<shm_open>(3))."
msgstr ""

#. type: Plain text
#: man-pages/man7/sem_overview.7:105
msgid ""
"Before being used, an unnamed semaphore must be initialized using "
"B<sem_init>(3).  It can then be operated on using B<sem_post>(3)  and "
"B<sem_wait>(3).  When the semaphore is no longer required, and before the "
"memory in which it is located is deallocated, the semaphore should be "
"destroyed using B<sem_destroy>(3)."
msgstr ""

#. type: Plain text
#: man-pages/man7/sem_overview.7:108
msgid ""
"The remainder of this section describes some specific details of the Linux "
"implementation of POSIX semaphores."
msgstr ""

#. type: SS
#: man-pages/man7/sem_overview.7:108
#, no-wrap
msgid "Versions"
msgstr ""

#. type: Plain text
#: man-pages/man7/sem_overview.7:114
msgid ""
"Prior to kernel 2.6, Linux supported only unnamed, thread-shared semaphores. "
" On a system with Linux 2.6 and a glibc that provides the NPTL threading "
"implementation, a complete implementation of POSIX semaphores is provided."
msgstr ""

#. type: SS
#: man-pages/man7/sem_overview.7:114
#, no-wrap
msgid "Persistence"
msgstr ""

#. type: Plain text
#: man-pages/man7/sem_overview.7:119
msgid ""
"POSIX named semaphores have kernel persistence: if not removed by "
"B<sem_unlink>(3), a semaphore will exist until the system is shut down."
msgstr ""

#. type: SS
#: man-pages/man7/sem_overview.7:119
#, no-wrap
msgid "Linking"
msgstr ""

#. type: Plain text
#: man-pages/man7/sem_overview.7:124
msgid ""
"Programs using the POSIX semaphores API must be compiled with I<cc -pthread> "
"to link against the real-time library, I<librt>."
msgstr ""

#. type: SS
#: man-pages/man7/sem_overview.7:124
#, no-wrap
msgid "Accessing named semaphores via the filesystem"
msgstr ""

#. type: Plain text
#: man-pages/man7/sem_overview.7:135
msgid ""
"On Linux, named semaphores are created in a virtual filesystem, normally "
"mounted under I</dev/shm>, with names of the form B<sem.>I<somename>.  (This "
"is the reason that semaphore names are limited to B<NAME_MAX>I<-4> rather "
"than B<NAME_MAX> characters.)"
msgstr ""

#. type: Plain text
#: man-pages/man7/sem_overview.7:138
msgid ""
"Since Linux 2.6.19, ACLs can be placed on files under this directory, to "
"control object permissions on a per-user and per-group basis."
msgstr ""

#. type: SH
#: man-pages/man7/sem_overview.7:138
#, no-wrap
msgid "CONFORMING TO"
msgstr ""

#. type: Plain text
#: man-pages/man7/sem_overview.7:140
msgid "POSIX.1-2001."
msgstr ""

#. type: SH
#: man-pages/man7/sem_overview.7:140
#, no-wrap
msgid "NOTES"
msgstr ""

#. type: Plain text
#: man-pages/man7/sem_overview.7:149
msgid ""
"System V semaphores (B<semget>(2), B<semop>(2), etc.) are an older semaphore "
"API.  POSIX semaphores provide a simpler, and better designed interface than "
"System V semaphores; on the other hand POSIX semaphores are less widely "
"available (especially on older systems) than System V semaphores."
msgstr ""

#. type: SH
#: man-pages/man7/sem_overview.7:149
#, no-wrap
msgid "EXAMPLE"
msgstr ""

#. type: Plain text
#: man-pages/man7/sem_overview.7:152
msgid ""
"An example of the use of various POSIX semaphore functions is shown in "
"B<sem_wait>(3)."
msgstr ""

#. type: SH
#: man-pages/man7/sem_overview.7:152
#, no-wrap
msgid "SEE ALSO"
msgstr ""

#. type: Plain text
#: man-pages/man7/sem_overview.7:162
msgid ""
"B<sem_close>(3), B<sem_destroy>(3), B<sem_getvalue>(3), B<sem_init>(3), "
"B<sem_open>(3), B<sem_post>(3), B<sem_unlink>(3), B<sem_wait>(3), "
"B<pthreads>(7)"
msgstr ""

#. type: SH
#: man-pages/man7/sem_overview.7:162
#, no-wrap
msgid "COLOPHON"
msgstr ""

#. type: Plain text
#: man-pages/man7/sem_overview.7:170
msgid ""
"This page is part of release 3.70 of the Linux I<man-pages> project.  A "
"description of the project, information about reporting bugs, and the latest "
"version of this page, can be found at \\%http://www.kernel.org/doc/man-pages/"
"."
msgstr ""