https://bugzilla.mcs.anl.gov/swift/show_bug.cgi?id=756 Summary: Swift array closing ambiguity Product: Swift Version: 0.93 Platform: PC OS/Version: Mac OS Status: NEW Severity: normal Priority: P2 Component: SwiftScript language AssignedTo: [email protected] ReportedBy: [email protected] I think from tests its the case that Swift fully closes an array when its returned from a function, but also allows modifications to that array by statements outside of the function that returns the array. I think this can lead to race conditions but dont yet have a test case that shows this. Im filing this so we dont loose track of this potential bug. The example below is one of a few variations. I think Tim may have reported similar issues when he first started testing Swift array semantics. ============================ com$ cat t1.race.swift (int a[]) fill() { a = [1:9]; } int out[]; if (1==1) { foreach i in [1] { out[0] = 123; } trace("in if",out); } if(2==2) { out = fill(); trace("in if-2",out); } if(3==3) { trace("END",out); } com$ swift t1.race.swift no sites file specified, setting to default: /home/wilde/swift/rev/trunk/etc/sites.xml Swift trunk swift-r5651 cog-r3361 RunID: 20120316-1731-z81sk1fd Progress: time: Fri, 16 Mar 2012 17:31:15 -0500 Execution failed: out is closed with a value of 123 com$ swift t1.race.swift no sites file specified, setting to default: /home/wilde/swift/rev/trunk/etc/sites.xml Swift trunk swift-r5651 cog-r3361 RunID: 20120316-1731-kvy0rel1 Progress: time: Fri, 16 Mar 2012 17:31:25 -0500 Execution failed: out is closed with a value of 123 com$ swift t1.race.swift no sites file specified, setting to default: /home/wilde/swift/rev/trunk/etc/sites.xml Swift trunk swift-r5651 cog-r3361 RunID: 20120316-1731-fxpisskc Progress: time: Fri, 16 Mar 2012 17:31:29 -0500 Execution failed: out is closed with a value of 123 com$ swift t1.race.swift no sites file specified, setting to default: /home/wilde/swift/rev/trunk/etc/sites.xml Swift trunk swift-r5651 cog-r3361 RunID: 20120316-1731-8jf41jq7 Progress: time: Fri, 16 Mar 2012 17:31:33 -0500 SwiftScript trace: in if-2, {0 = 1, 1 = 2, 2 = 3, 3 = 4, 4 = 5, 5 = 6, 6 = 7, 7 = 8, 8 = 9} SwiftScript trace: END, {0 = 1, 1 = 2, 2 = 3, 3 = 4, 4 = 5, 5 = 6, 6 = 7, 7 = 8, 8 = 9} SwiftScript trace: in if, {0 = 1, 1 = 2, 2 = 3, 3 = 4, 4 = 5, 5 = 6, 6 = 7, 7 = 8, 8 = 9} Execution failed: out is closed with a value of 1 com$ swift t1.race.swift no sites file specified, setting to default: /home/wilde/swift/rev/trunk/etc/sites.xml Swift trunk swift-r5651 cog-r3361 RunID: 20120316-1731-a5vb891f Progress: time: Fri, 16 Mar 2012 17:31:56 -0500 Execution failed: out is closed with a value of 123 com$ swift t1.race.swift no sites file specified, setting to default: /home/wilde/swift/rev/trunk/etc/sites.xml Swift trunk swift-r5651 cog-r3361 RunID: 20120316-1731-hhkppxn0 Progress: time: Fri, 16 Mar 2012 17:32:00 -0500 Execution failed: out is closed with a value of 123 com$ swift t1.race.swift no sites file specified, setting to default: /home/wilde/swift/rev/trunk/etc/sites.xml Swift trunk swift-r5651 cog-r3361 RunID: 20120316-1732-tupc3xi9 Progress: time: Fri, 16 Mar 2012 17:32:04 -0500 Execution failed: out is closed with a value of 123 com$ com$ -- Configure bugmail: https://bugzilla.mcs.anl.gov/swift/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching all bug changes.