fix NSP race condition which might occurr on Process.parent
fix NSP race condition which might occurr on Process.parent

shiva21/psutil,vmolsa/psutil,google-code-export/psutil,shiva21/psutil,anfedorov/psutil,AlanZatarain/psutil,jucapj/psutil,vmolsa/psutil,nmani1905/psutil,kiranvizru/psutil,marmolu/psutil,anfedorov/psutil,PFZheng/psutil,tigerneil/psutil,djhaskin987/psutil,google-code-export/psutil,kiranvizru/psutil,djhaskin987/psutil,vmolsa/psutil,kiranvizru/psutil,PFZheng/psutil,marmolu/psutil,tigerneil/psutil,AlanZatarain/psutil,google-code-export/psutil,huson2012/psutil,creativewild/psutil,vmolsa/psutil,kiranvizru/psutil,chjwang/psutil,stupidcache/psutil,creativewild/psutil,huson2012/psutil,google-code-export/psutil,end18/psutil,peter-hst/psutil,end18/psutil,tigerneil/psutil,stupidcache/psutil,creativewild/psutil,djhaskin987/psutil,peter-hst/psutil,skyshe/psutil,end18/psutil,Alwnikrotikz/psutil,djhaskin987/psutil,zhengzheng/psutil,skyshe/psutil,stupidcache/psutil,jucapj/psutil,huson2012/psutil,tigerneil/psutil,nmani1905/psutil,chjwang/psutil,skyshe/psutil,end18/psutil,Alwnikrotikz/psutil,skyshe/psutil,zhengzheng/psutil