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<?xml version="1.0" encoding="iso-8859-2"?>
<reference id="ref.sem">
<title>Funkce pro prci se semafory a sdlenou pamt</title>
<titleabbrev>Semaphore</titleabbrev>
<partintro>
<para>
Tato extenze poskytuje semaforov funkce vyuvajc System V semafory.
Semafory se daj pouvat k poskytovn exkluzivnho pstupu k prostedkm
na danm systmu, nebo k omezen potu proces, kter mohou souasn pouvat
urit prostedek.
</para>
<para>
Tato extenze tak poskytuje funkce pro prci se sdlenou pamt vyuvajc
System V sdlenou pam. Sdlen pmt se d pouvat k poskytovn pstupu
ke globlnm promnnm. Rzn httpd-daemoni a dokonce i jin programy (nap.
Perl, C, ...) mohou k tmto datm pistupovat, a vytvoit tak globln vmnu
dat. Pamatujte, e sdlen pam <emphasis>nen</emphasis> chrnna proti
simultnm pstupm. K synchronizaci pouijte semafory.
<table>
<title>Omezen sdlen pamti systmem Unix</title>
<tgroup cols="2">
<tbody>
<row>
<entry>SHMMAX</entry>
<entry>max. velikost sdlen pamti, normln 131072 byt</entry>
</row>
<row>
<entry>SHMMIN</entry>
<entry>min. velikost sdlen pamti, normlne 1 byte</entry>
</row>
<row>
<entry>SHMMNI</entry>
<entry>max. poet segment sdlen pamti, normln 100</entry>
</row>
<row>
<entry>SHMSEG</entry>
<entry>max. poet segment sdlen pamti na proces, normln 6</entry>
</row>
</tbody>
</tgroup>
</table>
</para>
<note>
<simpara>
Tyto funkce nefunguj na Windows.
</simpara>
</note>
</partintro>
<refentry id="function.sem-get">
<refnamediv>
<refname>sem_get</refname>
<refpurpose>Zskat id semaforu</refpurpose>
</refnamediv>
<refsect1>
<title>Popis</title>
<methodsynopsis>
<type>int</type><methodname>sem_get</methodname>
<methodparam><type>int</type><parameter>key</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>max_acquire</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>perm</parameter></methodparam>
</methodsynopsis>
<para>
Vrac idenfifiktor semaforu nebo &false;.
</para>
<para>
<function>sem_get</function> vrac id, kter se d pout k pstupu k
System V semaforu s danm klem. Podle poteby se vytvo nov semafor
s pstupovmi prvy definovanmi v <parameter>perm</parameter> (default je
0666). Poet proces, kter mohou tento semafor zskat souasn je
<parameter>max_acquire</parameter> (default je 1). Tato hodnota je ale
nastavena pouze pokud tento proces zjist, e k tomuto semaforu nen souasn
pipojen jin proces.
</para>
<para>
Druh voln <function>sem_get</function> se stejnm <parameter>key</parameter>
vrt jin identifiktor semaforu, ale oba identifiktory ukazuj na stejn
semafor.
</para>
<para>
Viz tak: <function>sem_acquire</function> a
<function>sem_release</function>.
</para>
<note>
<simpara>
Tato funkce nefunguje na Windows.
</simpara>
</note>
</refsect1>
</refentry>
<refentry id="function.sem-acquire">
<refnamediv>
<refname>sem_acquire</refname>
<refpurpose>Zskat semafor</refpurpose>
</refnamediv>
<refsect1>
<title>Popis</title>
<methodsynopsis>
<type>int</type><methodname>sem_acquire</methodname>
<methodparam><type>int</type><parameter>sem_identifier</parameter></methodparam>
</methodsynopsis>
<para>
Pi spchu vrac &true;, pi chyb
&false;.
</para>
<para>
<function>sem_acquire</function> blokuje (pokud je opteba) a do zskn
semaforu. Proces pokouejc se zskat semafor, kter u zskal bude
blokovat navky, pokud by zskn tohoto semaforu zpsobilo pekroen jeho
hodnoty max_acquire.
</para>
<para>
Po zpracovn poadavku se vechny zskan, ale explicitn neuvolnn
semafoty uvoln automaticky, a vygeneruje se varovn.
</para>
<para>
Viz tak: <function>sem_get</function> a
<function>sem_release</function>.
</para>
</refsect1>
</refentry>
<refentry id="function.sem-release">
<refnamediv>
<refname>sem_release</refname>
<refpurpose>Uvolnit semafor</refpurpose>
</refnamediv>
<refsect1>
<title>Popis</title>
<methodsynopsis>
<type>int</type><methodname>sem_release</methodname>
<methodparam><type>int</type><parameter>sem_identifier</parameter></methodparam>
</methodsynopsis>
<para>
Pi spchu vrac &true;, jinak &false;.
</para>
<para>
<function>sem_release</function> uvol semafor, pokud ho volajc proces
dr, jinak se vygeneruje varovn.
</para>
<para>
Po uvolnn me bt semafor znovu zskn pomoc
<function>sem_acquire</function>.
</para>
<para>
Viz tak: <function>sem_get</function> a
<function>sem_acquire</function>.
</para>
<note>
<simpara>
Tato funkce nefunguje na Windows.
</simpara>
</note>
</refsect1>
</refentry>
<refentry id="function.shm-attach">
<refnamediv>
<refname>shm_attach</refname>
<refpurpose>Vytvoit nebo otevt segment sdlen pamti</refpurpose>
</refnamediv>
<refsect1>
<title>Popis</title>
<methodsynopsis>
<type>int</type><methodname>shm_attach</methodname>
<methodparam><type>int</type><parameter>key</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>memsize</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>perm</parameter></methodparam>
</methodsynopsis>
<para>
<function>shm_attach</function> vrac id, kter se d pout k pstupu k
System V sdlen pamti s danm klem; prvn voln vytvo segment pamti
o velikosti mem_size (default: sysvshm.init_mem v <link
linkend="configuration.file">konfiguranm souboru</link>, jinak
10000 byt) a s volitelnmi prvy (default: 0666).
</para>
<para>
Druh voln <function>shm_attach</function> se stejnm
<parameter>key</parameter> vrt jin identifikto, ale oba ukazuj na
stejnou sdlenou pam. <parameter>memsize</parameter> a
<parameter>perm</parameter> se v takovm ppad ignoruj.
</para>
<note>
<simpara>
Tato funkce nefunguje na Windows.
</simpara>
</note>
</refsect1>
</refentry>
<refentry id="function.shm-detach">
<refnamediv>
<refname>shm_detach</refname>
<refpurpose>Odpojit se od segmentu sdlen pamti</refpurpose>
</refnamediv>
<refsect1>
<title>Popis</title>
<methodsynopsis>
<type>int</type><methodname>shm_detach</methodname>
<methodparam><type>int</type><parameter>shm_identifier</parameter></methodparam>
</methodsynopsis>
<para>
<function>shm_detach</function> odpojuje od sdlen pamti identifikovan
<parameter>shm_identifier</parameter> vytvoenm
<function>shm_attach</function>. Pamatujte, e tato sdlen pam dl
existuje a dr si data.
</para>
</refsect1>
</refentry>
<refentry id="function.shm-remove">
<refnamediv>
<refname>shm_remove</refname>
<refpurpose>Odstranit sdlenou pam ze systmu</refpurpose>
</refnamediv>
<refsect1>
<title>Popis</title>
<methodsynopsis>
<type>int</type><methodname>shm_remove</methodname>
<methodparam><type>int</type><parameter>shm_identifier</parameter></methodparam>
</methodsynopsis>
<para>
Odstran sdlenou pam z UNIXovho systmu. Vechna data v n budou zniena.
</para>
<note>
<simpara>
Tato funkce nefunguje na Windows.
</simpara>
</note>
</refsect1>
</refentry>
<refentry id="function.shm-put-var">
<refnamediv>
<refname>shm_put_var</refname>
<refpurpose>Vloit nebo modifikovat promnnou do sdlen pamti</refpurpose>
</refnamediv>
<refsect1>
<title>Popis</title>
<methodsynopsis>
<type>int</type><methodname>shm_put_var</methodname>
<methodparam><type>int</type><parameter>shm_identifier</parameter></methodparam>
<methodparam><type>int</type><parameter>variable_key</parameter></methodparam>
<methodparam><type>mixed</type><parameter>variable</parameter></methodparam>
</methodsynopsis>
<para>
Vlo nebo modifikuje <parameter>variable</parameter> s danm
<parameter>variable_key</parameter>. Vechny typy promnnch (double,
int, string, array) jsou podporovny.
</para>
<note>
<simpara>
Tato funkce nefunguje na Windows.
</simpara>
</note>
</refsect1>
</refentry>
<refentry id="function.shm-get-var">
<refnamediv>
<refname>shm_get_var</refname>
<refpurpose>Vrtit promnnou ze sdlen pamti</refpurpose>
</refnamediv>
<refsect1>
<title>Popis</title>
<methodsynopsis>
<type>mixed</type><methodname>shm_get_var</methodname>
<methodparam><type>int</type><parameter>id</parameter></methodparam>
<methodparam><type>int</type><parameter>variable_key</parameter></methodparam>
</methodsynopsis>
<para>
<function>shm_get_var</function> vrac promnnou s danm
<parameter>variable_key</parameter>. Promnn zstv ve sdlen pamti.
</para>
<note>
<simpara>
Tato funkce nefunguje na Windows.
</simpara>
</note>
</refsect1>
</refentry>
<refentry id="function.shm-remove-var">
<refnamediv>
<refname>shm_remove_var</refname>
<refpurpose>Odstranit promnnou ze sdlen pamti</refpurpose>
</refnamediv>
<refsect1>
<title>Popis</title>
<methodsynopsis>
<type>int</type><methodname>shm_remove_var</methodname>
<methodparam><type>int</type><parameter>id</parameter></methodparam>
<methodparam><type>int</type><parameter>variable_key</parameter></methodparam>
</methodsynopsis>
<para>
Odstran promnnou s danm<parameter>variable_key</parameter> a uvoln
zabranou pam.
</para>
<note>
<simpara>
Tato funkce nefunguje na Windows.
</simpara>
</note>
</refsect1>
</refentry>
</reference>
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