command.py: add new API to get the cpu count on the server

Add a new API in command.py to get the cpu count in order to set the appropriate default BB_NUMBER_THREADS and PARALLEL_MAKE variables.

(Bitbake rev: 335047b2e440e65713e88fabb24b47a9c82f939b)

Signed-off-by: Shane Wang <shane.wang@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/command.py

@@ -173,6 +173,12 @@ class CommandsSync:
         """
         command.cooker.reset()
 
+    def getCpuCount(self, command, params):
+        """
+        Get the CPU count on the bitbake server
+        """
+        return bb.utils.cpu_count()
+
 
 class CommandsAsync:
     """

bitbake/lib/bb/utils.py

@@ -25,6 +25,7 @@ import errno
 import logging
 import bb
 import bb.msg
+import multiprocessing
 from commands import getstatusoutput
 from contextlib import contextmanager
 
@@ -862,3 +863,6 @@ def contains(variable, checkvalues, truevalue, falsevalue, d):
     if checkvalues.issubset(val): 
         return truevalue
     return falsevalue
+
+def cpu_count():
+    return multiprocessing.cpu_count()