Cope with case that SEM_FAILED is not defined (assume failure code is -1)
Cope with case that SEM_FAILED is not defined (assume failure code is -1)

jmcatamney/gpdb,50wu/gpdb,lintzc/gpdb,janebeckman/gpdb,edespino/gpdb,zaksoup/gpdb,royc1/gpdb,xuegang/gpdb,CraigHarris/gpdb,0x0FFF/gpdb,Quikling/gpdb,tangp3/gpdb,greenplum-db/gpdb,zeroae/postgres-xl,kaknikhil/gpdb,cjcjameson/gpdb,oberstet/postgres-xl,yazun/postgres-xl,xinzweb/gpdb,pavanvd/postgres-xl,Chibin/gpdb,kmjungersen/PostgresXL,chrishajas/gpdb,postmind-net/postgres-xl,randomtask1155/gpdb,cjcjameson/gpdb,xuegang/gpdb,lisakowen/gpdb,ashwinstar/gpdb,arcivanov/postgres-xl,yazun/postgres-xl,adam8157/gpdb,zaksoup/gpdb,atris/gpdb,pavanvd/postgres-xl,ashwinstar/gpdb,adam8157/gpdb,rubikloud/gpdb,Postgres-XL/Postgres-XL,xuegang/gpdb,Quikling/gpdb,zeroae/postgres-xl,CraigHarris/gpdb,cjcjameson/gpdb,rvs/gpdb,randomtask1155/gpdb,xinzweb/gpdb,lintzc/gpdb,techdragon/Postgres-XL,kmjungersen/PostgresXL,techdragon/Postgres-XL,adam8157/gpdb,edespino/gpdb,ovr/postgres-xl,chrishajas/gpdb,pavanvd/postgres-xl,xuegang/gpdb,arcivanov/postgres-xl,rvs/gpdb,janebeckman/gpdb,lisakowen/gpdb,xuegang/gpdb,lpetrov-pivotal/gpdb,janebeckman/gpdb,lintzc/gpdb,zeroae/postgres-xl,yuanzhao/gpdb,lintzc/gpdb,lpetrov-pivotal/gpdb,Chibin/gpdb,rvs/gpdb,tpostgres-projects/tPostgres,atris/gpdb,50wu/gpdb,lisakowen/gpdb,ashwinstar/gpdb,Chibin/gpdb,randomtask1155/gpdb,edespino/gpdb,ahachete/gpdb,foyzur/gpdb,royc1/gpdb,lisakowen/gpdb,lisakowen/gpdb,Chibin/gpdb,snaga/postgres-xl,0x0FFF/gpdb,zaksoup/gpdb,Postgres-XL/Postgres-XL,royc1/gpdb,techdragon/Postgres-XL,Chibin/gpdb,kaknikhil/gpdb,ashwinstar/gpdb,royc1/gpdb,kaknikhil/gpdb,lpetrov-pivotal/gpdb,adam8157/gpdb,lintzc/gpdb,Quikling/gpdb,0x0FFF/gpdb,zeroae/postgres-xl,ashwinstar/gpdb,50wu/gpdb,Quikling/gpdb,kaknikhil/gpdb,chrishajas/gpdb,xuegang/gpdb,janebeckman/gpdb,lintzc/gpdb,snaga/postgres-xl,rubikloud/gpdb,cjcjameson/gpdb,postmind-net/postgres-xl,randomtask1155/gpdb,atris/gpdb,cjcjameson/gpdb,greenplum-db/gpdb,yuanzhao/gpdb,xinzweb/gpdb,edespino/gpdb,xuegang/gpdb,janebeckman/gpdb,randomtask1155/gpdb,jmcatamney/gpdb,arcivanov/postgres-xl,xinzweb/gpdb,adam8157/gpdb,ahachete/gpdb,rvs/gpdb,cjcjameson/gpdb,snaga/postgres-xl,tpostgres-projects/tPostgres,edespino/gpdb,kaknikhil/gpdb,CraigHarris/gpdb,CraigHarris/gpdb,jmcatamney/gpdb,oberstet/postgres-xl,Chibin/gpdb,zaksoup/gpdb,ovr/postgres-xl,yuanzhao/gpdb,jmcatamney/gpdb,kmjungersen/PostgresXL,kaknikhil/gpdb,rubikloud/gpdb,0x0FFF/gpdb,arcivanov/postgres-xl,foyzur/gpdb,postmind-net/postgres-xl,0x0FFF/gpdb,CraigHarris/gpdb,greenplum-db/gpdb,ahachete/gpdb,techdragon/Postgres-XL,lisakowen/gpdb,foyzur/gpdb,lpetrov-pivotal/gpdb,yazun/postgres-xl,zaksoup/gpdb,Postgres-XL/Postgres-XL,atris/gpdb,atris/gpdb,snaga/postgres-xl,edespino/gpdb,pavanvd/postgres-xl,foyzur/gpdb,0x0FFF/gpdb,50wu/gpdb,tangp3/gpdb,ahachete/gpdb,lisakowen/gpdb,xinzweb/gpdb,Quikling/gpdb,rvs/gpdb,janebeckman/gpdb,arcivanov/postgres-xl,yuanzhao/gpdb,randomtask1155/gpdb,atris/gpdb,Quikling/gpdb,jmcatamney/gpdb,janebeckman/gpdb,edespino/gpdb,rubikloud/gpdb,tangp3/gpdb,tangp3/gpdb,yazun/postgres-xl,greenplum-db/gpdb,arcivanov/postgres-xl,greenplum-db/gpdb,zeroae/postgres-xl,0x0FFF/gpdb,CraigHarris/gpdb,yuanzhao/gpdb,royc1/gpdb,kaknikhil/gpdb,lintzc/gpdb,CraigHarris/gpdb,rvs/gpdb,kaknikhil/gpdb,tangp3/gpdb,atris/gpdb,zaksoup/gpdb,ashwinstar/gpdb,postmind-net/postgres-xl,cjcjameson/gpdb,cjcjameson/gpdb,tangp3/gpdb,lpetrov-pivotal/gpdb,ashwinstar/gpdb,Chibin/gpdb,kmjungersen/PostgresXL,chrishajas/gpdb,tpostgres-projects/tPostgres,foyzur/gpdb,rvs/gpdb,Quikling/gpdb,oberstet/postgres-xl,chrishajas/gpdb,yazun/postgres-xl,yuanzhao/gpdb,lpetrov-pivotal/gpdb,chrishajas/gpdb,lintzc/gpdb,greenplum-db/gpdb,xinzweb/gpdb,ashwinstar/gpdb,tangp3/gpdb,rvs/gpdb,tpostgres-projects/tPostgres,tangp3/gpdb,foyzur/gpdb,oberstet/postgres-xl,lpetrov-pivotal/gpdb,50wu/gpdb,royc1/gpdb,rubikloud/gpdb,foyzur/gpdb,Chibin/gpdb,0x0FFF/gpdb,postmind-net/postgres-xl,rubikloud/gpdb,50wu/gpdb,jmcatamney/gpdb,CraigHarris/gpdb,ovr/postgres-xl,janebeckman/gpdb,tpostgres-projects/tPostgres,ovr/postgres-xl,janebeckman/gpdb,Quikling/gpdb,edespino/gpdb,lpetrov-pivotal/gpdb,techdragon/Postgres-XL,ovr/postgres-xl,yuanzhao/gpdb,kaknikhil/gpdb,lintzc/gpdb,randomtask1155/gpdb,zaksoup/gpdb,rvs/gpdb,royc1/gpdb,Chibin/gpdb,adam8157/gpdb,xinzweb/gpdb,ahachete/gpdb,janebeckman/gpdb,Quikling/gpdb,kmjungersen/PostgresXL,yuanzhao/gpdb,Quikling/gpdb,snaga/postgres-xl,rubikloud/gpdb,CraigHarris/gpdb,chrishajas/gpdb,50wu/gpdb,Postgres-XL/Postgres-XL,cjcjameson/gpdb,cjcjameson/gpdb,edespino/gpdb,yuanzhao/gpdb,atris/gpdb,xuegang/gpdb,Chibin/gpdb,pavanvd/postgres-xl,oberstet/postgres-xl,randomtask1155/gpdb,ahachete/gpdb,royc1/gpdb,kaknikhil/gpdb,adam8157/gpdb,yuanzhao/gpdb,Postgres-XL/Postgres-XL,jmcatamney/gpdb,rubikloud/gpdb,rvs/gpdb,ahachete/gpdb,zaksoup/gpdb,50wu/gpdb,xinzweb/gpdb,lisakowen/gpdb,adam8157/gpdb,ahachete/gpdb,greenplum-db/gpdb,edespino/gpdb,jmcatamney/gpdb,chrishajas/gpdb,xuegang/gpdb,greenplum-db/gpdb,foyzur/gpdb