Experimental Physics and
Industrial Control System

Ralph Lange has proposed merging lp:~epics-core/epics-base/get-cpus into lp:epics-base.

Requested reviews:
  EPICS Core Developers (epics-core)

For more details, see:
https://code.launchpad.net/~epics-core/epics-base/get-cpus/+merge/155967

Add int epicsThreadGetCPUs() to the epicsThread API.

epicsThreadGetCPUs() returns the number of logical CPUs that are available for the IOC. On systems that use Hyper-Threading, this number may be up to twice the number of physical cores.

The Posix and WIN32 implementations are returning the number of CPUs available for the process, which may be limited by the system.
For the time being, vxWorks just returns 1.

Only tested for Linux. The implementations for RTEMS, vxWorks and WIN32 need testing, please...
-- 
https://code.launchpad.net/~epics-core/epics-base/get-cpus/+merge/155967
Your team EPICS Core Developers is requested to review the proposed merge of lp:~epics-core/epics-base/get-cpus into lp:epics-base.

=== modified file 'src/libCom/osi/epicsThread.h'
--- src/libCom/osi/epicsThread.h	2012-07-06 21:33:10 +0000
+++ src/libCom/osi/epicsThread.h	2013-03-28 14:15:26 +0000
@@ -3,7 +3,7 @@
 *     National Laboratory.
 * Copyright (c) 2002 The Regents of the University of California, as
 *     Operator of Los Alamos National Laboratory.
-* Copyright (c) 2012 ITER Organization
+* Copyright (c) 2013 ITER Organization.
 * EPICS BASE is distributed subject to a Software License Agreement found
 * in file LICENSE that is included with this distribution. 
 \*************************************************************************/
@@ -85,6 +85,7 @@
 epicsShareFunc double epicsShareAPI epicsThreadSleepQuantum(void);
 epicsShareFunc epicsThreadId epicsShareAPI epicsThreadGetIdSelf(void);
 epicsShareFunc epicsThreadId epicsShareAPI epicsThreadGetId(const char *name);
+epicsShareFunc int epicsThreadGetCPUs(void);
 
 epicsShareFunc const char * epicsShareAPI epicsThreadGetNameSelf(void);
 

=== modified file 'src/libCom/osi/os/RTEMS/osdThread.c'
--- src/libCom/osi/os/RTEMS/osdThread.c	2012-07-31 19:04:38 +0000
+++ src/libCom/osi/os/RTEMS/osdThread.c	2013-03-28 14:15:26 +0000
@@ -718,3 +718,12 @@
 
     return 1.0 / rtemsTicksPerSecond_double;
 }
+
+epicsShareFunc int epicsThreadGetCPUs(void)
+{
+#if defined(RTEMS_SMP)
+    return rtems_smp_get_number_of_processors();
+#else
+    return 1;
+#endif
+}

=== modified file 'src/libCom/osi/os/WIN32/osdThread.c'
--- src/libCom/osi/os/WIN32/osdThread.c	2012-07-31 19:04:38 +0000
+++ src/libCom/osi/os/WIN32/osdThread.c	2013-03-28 14:15:26 +0000
@@ -1105,6 +1105,14 @@
     return ( void * ) TlsGetValue ( pPvt->key );
 }
 
+/*
+ * epicsThreadGetCPUs ()
+ */
+epicsShareFunc int epicsThreadGetCPUs ( void )
+{
+    return atoi(getenv("NUMBER_OF_PROCESSORS"));
+}
+
 #ifdef TEST_CODES
 void testPriorityMapping ()
 {

=== modified file 'src/libCom/osi/os/posix/osdThread.c'
--- src/libCom/osi/os/posix/osdThread.c	2012-09-20 19:55:32 +0000
+++ src/libCom/osi/os/posix/osdThread.c	2013-03-28 14:15:26 +0000
@@ -3,7 +3,7 @@
 *     National Laboratory.
 * Copyright (c) 2002 The Regents of the University of California, as
 *     Operator of Los Alamos National Laboratory.
-* Copyright (c) 2012 ITER Organization
+* Copyright (c) 2013 ITER Organization.
 * EPICS BASE is distributed subject to a Software License Agreement found
 * in file LICENSE that is included with this distribution. 
 \*************************************************************************/
@@ -873,3 +873,7 @@
     return 1.0 / hz;
 }
 
+epicsShareFunc int epicsThreadGetCPUs(void)
+{
+    return sysconf(_SC_NPROCESSORS_ONLN);
+}

=== modified file 'src/libCom/osi/os/vxWorks/osdThread.c'
--- src/libCom/osi/os/vxWorks/osdThread.c	2012-07-31 19:04:38 +0000
+++ src/libCom/osi/os/vxWorks/osdThread.c	2013-03-28 14:15:26 +0000
@@ -449,3 +449,8 @@
     double HZ = sysClkRateGet ();
     return 1.0 / HZ;
 }
+
+epicsShareFunc int epicsThreadGetCPUs(void)
+{
+    return 1;
+}

Replies:

Re: [Merge] lp:~epics-core/epics-base/get-cpus into lp:epics-base mdavidsaver

Re: [Merge] lp:~epics-core/epics-base/get-cpus into lp:epics-base Andrew Johnson

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