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Verify output space before doing heavy work in mallctl

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Yinan Zhang
2020-07-22 14:46:43 -07:00
parent f5fb4e5a97
commit fb347dc618
2 changed files with 42 additions and 16 deletions
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21
doc/jemalloc.xml.in
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@@ -1760,7 +1760,16 @@ malloc_conf = "xmalloc:true";]]></programlisting>
automatically managed one that is used by default. Each explicit cache
can be used by only one thread at a time; the application must assure
that this constraint holds.
</para>
<para>If the amount of space supplied for storing the thread-specific
cache identifier does not equal
<code language="C">sizeof(<type>unsigned</type>)</code>, no
thread-specific cache will be created, no data will be written to the
space pointed by <parameter>oldp</parameter>, and
<parameter>*oldlenp</parameter> will be set to 0.
</para></listitem>
</varlistentry>
<varlistentry id="tcache.flush">
@@ -2300,7 +2309,14 @@ struct extent_hooks_s {
</term>
<listitem><para>Explicitly create a new arena outside the range of
automatically managed arenas, with optionally specified extent hooks,
and return the new arena index.</para></listitem>
and return the new arena index.</para>
<para>If the amount of space supplied for storing the arena index does
not equal <code language="C">sizeof(<type>unsigned</type>)</code>, no
arena will be created, no data will be written to the space pointed by
<parameter>oldp</parameter>, and <parameter>*oldlenp</parameter> will
be set to 0.
</para></listitem>
</varlistentry>
<varlistentry id="arenas.lookup">
@@ -3607,7 +3623,8 @@ MAPPED_LIBRARIES:
<listitem><para><parameter>newp</parameter> is not
<constant>NULL</constant>, and <parameter>newlen</parameter> is too
large or too small. Alternatively, <parameter>*oldlenp</parameter>
is too large or too small; in this case as much data as possible
is too large or too small; when it happens, except for a very few
cases explicitly documented otherwise, as much data as possible
are read despite the error, with the amount of data read being
recorded in <parameter>*oldlenp</parameter>.</para></listitem>
</varlistentry>