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Merged Ralph's spinlocks branch.

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Added an RTEMS implementation which locks interrupts,
and some Release Notes mentioning the new API.
This commit is contained in:
Andrew Johnson
2013-02-12 12:13:01 -06:00
parent c5602af1b4 d69f3904d7
commit d85d1f0e56
12 changed files with 572 additions and 3 deletions
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documentation/RELEASE_NOTES.html
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@@ -15,6 +15,18 @@ 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>Spin-locks API added</h3>
<p>The new header file epicsSpin.h adds a portable spin-locks API which is
intended for locking very short sections of code (typically one or two lines of
C or C++) to provide a critical section that protects against race conditions.
On Posix platforms this uses the pthread_spinlock_t type if it's available but
falls back to a pthread_mutex_t if not; on the UP VxWorks and RTEMS platforms
the implementations lock out the CPU interrupts; the default implementation
(used where no better implementation is available for the platform) uses an
epicsMutex. Spin-locks may not be taken recursively, and the code inside the
critical section should always be short and deterministic.</p>
<h3>Improvements to aToIPAddr()</h3>
<p>The libCom routine aToIPAddr() and the vxWorks implementation of the