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dbStatic: Added hook routine for dbLoadRecords()

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Requested by Tim Mooney for use by Autosave.
See the Release Notes for documentation.

This commit also corrects the decorations for recGblAlarmHook.
This commit is contained in:
Andrew Johnson
2014-10-31 16:18:25 -05:00
parent 647bd334ae
commit 64bf84169c
5 changed files with 71 additions and 9 deletions
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59
documentation/RELEASE_NOTES.html
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@@ -3,17 +3,66 @@
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1">
<title>EPICS Base R3.15.0.1 Release Notes</title>
<title>EPICS Base R3.15.1 Release Notes</title>
</head>
<body lang="en">
<h1 align="center">EPICS Base Release 3.15.0.2</h1>
<h1 align="center">EPICS Base Release 3.15.1</h1>
<p style="color:red">This version of EPICS Base has not been released yet.</p>
<h2 align="center">Changes between 3.15.0.2 and 3.15.1</h2>
<!-- Insert new items immediately below here ... -->
<h3>Hooking into dbLoadRecords</h3>
<p>A function pointer hook has been added to the dbLoadRecords() routine, to
allow external modules such as autosave to be notified when new records have
been loaded during IOC initialization. The hook is called dbLoadRecordsHook and
follows the model of the recGblAlarmHook pointer in that modules that wish to
use it must save the current value of the pointer before installing their own
function pointer, and must call the original function from their own
routine.</p>
<p>The hook is activiated from the dbLoadRecords() routine and gets called only
after a database instance file has been read in without error. Note that the
dbLoadTemplates() routine directly calls dbLoadRecords() so this hook also
provides information about instantiated database templates. It is still possible
to load record instances using dbLoadDatabase() though, and doing this will not
result in the hook routines being called.</p>
<p>Code to use this hook should look something like this:</p>
<blockquote><pre>
#include "dbAccessDefs.h"
static DB_LOAD_RECORDS_HOOK_ROUTINE previousHook;
static void myRoutine(const char* file, const char* subs) {
if (previousHook)
previousHook(file, subs);
/* Do whatever ... */
}
void myInit(void) {
static int done = 0;
if (!done) {
previousHook = dbLoadRecordsHook;
dbLoadRecordsHook = myRoutine;
done = 1;
}
}
</pre></blockquote>
<p>As with many other parts of the static database access library there is no
mutex to protect the function pointer. Initialization is expected to take place
in the context of the IOC's main thread, from either a static C++ constructor or
an EPICS registrar routine.</p>
<p>
EPICS Base 3.15.0.x releases are not intended for use in production systems.</p>
<h2 align="center">Changes between 3.15.0.1 and 3.15.0.2</h2>
<!-- Insert new items immediately below here ... -->
<h3>New iocshLoad command</h3>