Merged changes from 3.15 branch, to revno 12807
This commit is contained in:
Andrew Johnson
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<meta http-equiv="content-type" content="text/html; charset=iso-8859-1">
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<title>EPICS Base R3.16.0.2 Release Notes</title>
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<title>EPICS Base R3.16.1 Release Notes</title>
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<body lang="en">
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<h1 align="center">EPICS Base Release 3.16.0.2</h1>
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<h1 align="center">EPICS Base Release 3.16.1</h1>
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<p style="color:red">This version of EPICS Base has not been released yet.</p>
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<h2 align="center">Changes made on the 3.16 branch since 3.16.0.1</h2>
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@@ -138,13 +139,117 @@ callback.h header and removed the need for dbScan.c to reach into the internals
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of its CALLBACK objects.</p>
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<h2 align="center">Changes from the 3.15 branch since 3.15.4</h2>
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<h2 align="center">Changes from the 3.15 branch since 3.15.5</h2>
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<h2 align="center">Changes from the 3.14 branch since 3.15.4</h2>
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<h2 align="center">Changes from the 3.14 branch since 3.15.5</h2>
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<h3>Server bind issue on Windows</h3>
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<p>When a National Instruments network variables CA server is already running on
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a Windows system and an IOC or PCAS server is started, the IOC's attempt to
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bind a TCP socket to the CA server port number fails, but Windows returns a
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different error status value than the IOC is expecting in that circumstance
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(because the National Instruments code requests exclusive use of that port,
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unlike the EPICS code) so the IOC fails to start properly. The relevent EPICS
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bind() checks have now been updated so the IOC will request that a dynamic port
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number be allocated for this TCP socket instead when this happens.</p>
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<h3>Checking Periodic Scan Rates</h3>
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<p>Code has been added to the IOC startup to better protect it against bad
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periodic scan rates, including against locales where <q><tt>.</tt></q> is not
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accepted as a decimal separator character. If the scan period in a menuScan
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choice string cannot be parsed, the associated periodic scan thread will no
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longer be started by the IOC and a warning message will be displayed at iocInit
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time. The <tt>scanppl</tt> command will also flag the faulty menuScan value.</p>
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<h2 align="center">Changes made between 3.15.4 and 3.15.5</h2>
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<h3>dbStatic Library Speedup and Cleanup</h3>
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<p>Loading of database files has been optimized to avoid overproportionally
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long loading times for large databases. As a part of this, the alphabetical
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ordering of records instances (within a record type) has been dropped. In the
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unexpected case that applications were relying on the alphabetic order, setting
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<tt>dbRecordsAbcSorted = 1</tt> before loading the databases will retain the
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old behavior.</p>
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<p>The routine <tt>dbRenameRecord()</tt> has been removed, as it was intended
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to be used by database configuration tools linked against a host side version
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of the dbStatic library that is not being built anymore.</p>
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<h3>Launchpad Bug-fixes</h3>
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<p>In addition to the more detailed change descriptions below, the following
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Launchpad bugs have also been fixed in this release:</p>
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<ul>
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<li><a href="https://bugs.launchpad.net/epics-base/+bug/1440186">
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#1440186</a> Crash due to a too small buffer being provided in
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dbContextReadNotifyCache</li>
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<li><a href="https://bugs.launchpad.net/epics-base/+bug/1479316">
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#1479316</a> Some data races found using Helgrind</li>
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<li><a href="https://bugs.launchpad.net/epics-base/+bug/1495833">
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#1495833</a> biRecord prompt groups are nonsensical</li>
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<li><a href="https://bugs.launchpad.net/epics-base/+bug/1606848">
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#1606848</a> WSAIoctl SIO_GET_INTERFACE_LIST failed in Windows</li>
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</ul>
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<h3>Whole-Program Optimization for MS Visual Studio Targets</h3>
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<p>When using the Microsoft compilers a new build system variable is provided
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that controls whether whole program optimization is used or not. For static
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builds using Visual Studio 2010 this optimization must be disabled. This is
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controlled in the files configure/os/CONFIG_SITE.Common.windows-x64-static and
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configure/os/CONFIG_SITE.Common.win32-x86-static by setting the variable
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<tt>OPT_WHOLE_PROGRAM = NO</tt> to override the default value
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<tt>YES</tt> that would otherwise be used.</p>
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<p>Note that enabling this optimization slows down the build process. It is not
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possible to selectively disable this optimization, when building a particular
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module say; Microsoft's linker will restart itself automatically with the
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<tt>-LTCG</tt> flag set and display a warning if it is asked to link any object
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files that were compiled with the <tt>-GL</tt> flag.</p>
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<h3>Add dynamic (variable length) array support to PCAS</h3>
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<p>Dynamic array sizing support was added to the IOC server (RSRV) in the
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Base-3.14.12 release, but has not until now been supported in the <q>Portable
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Channel Access Server</q> (PCAS). Channel Access server applications using the
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PCAS may not need to be modified at all; if they already push monitors with
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different gdd array lengths, those variable sizes will be forwarded to any CA
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clients who have requested variable length updates. The example CAS server
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application has been modified to demonstrate this feature.</p>
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<p>In implementing the above, the gdd method <tt>gdd::put(const gdd *)</tt> now
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copies the full-sized array from the source gdd if the destination gdd is of
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type array, has no allocated memory and a boundary size of 0.</p>
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<h3>Additional epicsTime conversion</h3>
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<p>The EPICS timestamp library (epicsTime) inside libCom's OSI layer has
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been extended by routines that convert from <tt>struct tm</tt> to the EPICS
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internal <tt>epicsTime</tt> type, assuming UTC - i.e. without going through
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the timezone mechanism. This solves issues with converting from the structured
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type to the EPICS timestamp at driver level from multiple threads at a high
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repetition rate, where the timezone mechanism was blocking on file access.</p>
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<h3>MinGW Cross-builds from Linux</h3>
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<p>The build configuration files that allow cross-building of the 32-bit
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win32-x86-mingw cross-target have been adjusted to default to building shared
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libraries (DLLs) as this is now supported by recent MinGW compilers. The 64-bit
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windows-x64-mingw cross-target was already being built that way by default. The
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configuration options to tell the minGW cross-compiler to link programs with
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static versions of the compiler support libraries have now been moved into the
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CONFIG_SITE.linux-x86.<i>target</i> files.</p>
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<h3>General Time updates</h3>
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<p>The <tt>iocInit</tt> code now performs a sanity check of the current time
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