diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/monitoring.sgml | 5 | ||||
| -rw-r--r-- | doc/src/sgml/xfunc.sgml | 26 |
2 files changed, 6 insertions, 25 deletions
diff --git a/doc/src/sgml/monitoring.sgml b/doc/src/sgml/monitoring.sgml index f4fc5d814fb..70511a2388e 100644 --- a/doc/src/sgml/monitoring.sgml +++ b/doc/src/sgml/monitoring.sgml @@ -1121,9 +1121,8 @@ SELECT pid, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event i <literal>LWLock</literal> types to the list shown in <xref linkend="wait-event-extension-table"/> and <xref linkend="wait-event-lwlock-table"/>. In some cases, the name - assigned by an extension will not be available in all server processes; - so an <literal>Extension</literal> or <literal>LWLock</literal> wait - event might be reported as just + of <literal>LWLock</literal> assigned by an extension will not be + available in all server processes; It might be reported as just <quote><literal>extension</literal></quote> rather than the extension-assigned name. </para> diff --git a/doc/src/sgml/xfunc.sgml b/doc/src/sgml/xfunc.sgml index d6345a775b6..281c178b0e8 100644 --- a/doc/src/sgml/xfunc.sgml +++ b/doc/src/sgml/xfunc.sgml @@ -3454,33 +3454,15 @@ if (!ptr) </sect2> <sect2 id="xfunc-addin-wait-events"> - <title>Shared Memory and Custom Wait Events</title> + <title>Custom Wait Events</title> <para> Add-ins can define custom wait events under the wait event type - <literal>Extension</literal>. The add-in's shared library must be - preloaded by specifying it in <literal>shared_preload_libraries</literal>, - and register a <literal>shmem_request_hook</literal> and a - <literal>shmem_startup_hook</literal> in its - <function>_PG_init</function> function. - <literal>shmem_request_hook</literal> can request a shared memory size - to be later used at startup by calling: + <literal>Extension</literal> by calling: <programlisting> -void RequestAddinShmemSpace(int size) -</programlisting> - </para> - <para> - <literal>shmem_startup_hook</literal> can allocate in shared memory - custom wait events by calling while holding the LWLock - <function>AddinShmemInitLock</function> to avoid any race conditions: -<programlisting> -uint32 WaitEventExtensionNew(void) -</programlisting> - Next, each process needs to associate the wait event allocated previously - to a user-facing custom string, which is something done by calling: -<programlisting> -void WaitEventExtensionRegisterName(uint32 wait_event_info, const char *wait_event_name) +uint32 WaitEventExtensionNew(const char *wait_event_name) </programlisting> + The wait event is associated to a user-facing custom string. An example can be found in <filename>src/test/modules/worker_spi</filename> in the PostgreSQL source tree. </para> |