[bug #39092] NSLock deadlock even in trivial GSWeb application

[Graham Lee]

Follow-up Comment #3, bug #39092 (project gnustep):

Forgive me talking to myself, but I've made some progress on this. I wrote my
own <NSLocking> class that both checks the pthread_mutex errors and stores the
call stack at the point where it gets locked. If it gets deadlocked, it prints
both the callstack where it was originally locked and the one where it
deadlocked. So we now have this:


2013-05-29 19:40:59.228 EmptyApp[14545:3a07] Error locking
GLLock<0x7f8372012120>: 11
2013-05-29 19:40:59.234 EmptyApp[14545:3a07] Was already locked here: (
        0   WebObjects                          0x000000010b818c54 -[GLLock
lockBeforeDate:] + 148
        1   WebObjects                          0x000000010b849f58
loggedLockBeforeDateFromFunctionInFileInLine + 88
        2   WebObjects                          0x000000010b819dc1 
-[WOApplication
lockRequestHandling] + 113
        3   WebObjects                          0x000000010b86387d
-[GSWActionRequestHandler handleRequest:] + 141
        4   WebObjects                          0x000000010b81d2f0 
-[WOApplication
dispatchRequest:] + 224
        5   WebObjects                          0x000000010b876fe2 
-[GSWWorkerThread
runOnce] + 386
        6   Foundation                          0x00007fff8bc4ccd2 
__NSThread__main__
+ 1345
        7   libsystem_c.dylib                   0x00007fff965fd7a2 
_pthread_start +
327
        8   libsystem_c.dylib                   0x00007fff965ea1e1 thread_start 
+ 13
)
2013-05-29 19:40:59.250 EmptyApp[14545:3a07] And I want it here: (
        0   WebObjects                          0x000000010b818ac4 -[GLLock 
lock] +
100
        1   WebObjects                          0x000000010b81c6fa 
-[WOApplication
pageWithName:inContext:] + 90
        2   WebObjects                          0x000000010b8607d0 -[GSWAction
pageWithName:] + 176
        3   WebObjects                          0x000000010b860efa 
-[WODirectAction
defaultAction] + 26
        4   WebObjects                          0x000000010b860dd3 
-[WODirectAction
performActionNamed:] + 67
        5   WebObjects                          0x000000010b8641e9
-[GSWActionRequestHandler _handleRequest:] + 1257
        6   WebObjects                          0x000000010b86388d
-[GSWActionRequestHandler handleRequest:] + 157
        7   WebObjects                          0x000000010b81d2f0 
-[WOApplication
dispatchRequest:] + 224
        8   WebObjects                          0x000000010b876fe2 
-[GSWWorkerThread
runOnce] + 386
        9   Foundation                          0x00007fff8bc4ccd2 
__NSThread__main__
+ 1345
        10  libsystem_c.dylib                   0x00007fff965fd7a2 
_pthread_start +
327
        11  libsystem_c.dylib                   0x00007fff965ea1e1 thread_start 
+ 13
)


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