Hangup - possible thread race condition

[Nea Gix]

Sometimes I get a hangup in tactical mode, most times when it's player's turn but once happened on CPU's turn. I get the waiting clock cursor but game is unresponsive. Music keeps playing fine.

This is what gdb shows (with symbols) for thread 1:

#0  0x00007f07a3a8d12d in nanosleep () from /usr/lib/libpthread.so.0
No symbol table info available.
#1  0x00007f07a3ceef69 in SDL_Delay () from /usr/lib/libSDL-1.2.so.0
No symbol table info available.
#2  0x00000000006a5918 in MainLoop (msPerGameCycle=25) at sgp/SGP.cc:255
        gameCycleMS = 2
        event = {type = 1 '\001', active = {type = 1 '\001', gain = 0 '\000', 
            state = 2 '\002'}, key = {type = 1 '\001', which = 0 '\000', 
            state = 2 '\002', keysym = {scancode = 0 '\000', 
              sym = SDLK_UNKNOWN, mod = KMOD_NONE, unicode = 0}}, motion = {
            type = 1 '\001', which = 0 '\000', state = 2 '\002', x = 0, y = 0, 
            xrel = 0, yrel = 0}, button = {type = 1 '\001', which = 0 '\000', 
            button = 2 '\002', state = 0 '\000', x = 0, y = 0}, jaxis = {
            type = 1 '\001', which = 0 '\000', axis = 2 '\002', value = 0}, 
          jball = {type = 1 '\001', which = 0 '\000', ball = 2 '\002', 
            xrel = 0, yrel = 0}, jhat = {type = 1 '\001', which = 0 '\000', 
            hat = 2 '\002', value = 0 '\000'}, jbutton = {type = 1 '\001', 
            which = 0 '\000', button = 2 '\002', state = 0 '\000'}, resize = {
            type = 1 '\001', w = 0, h = 0}, expose = {type = 1 '\001'}, 
          quit = {type = 1 '\001'}, user = {type = 1 '\001', code = 0, 
            data1 = 0x0, data2 = 0x0}, syswm = {type = 1 '\001', msg = 0x0}}
        s_doGameCycles = 1 '\001'
#3  0x00000000006a600d in main (argc=1, argv=0x7fff4b29ed48) at sgp/SGP.cc:494
---Type <return> to continue, or q <return> to quit---
        params = {useMod = false, modName = "", resourceVersionGiven = false, 
          resourceVersion = "", doUnitTests = false, showDebugMessages = false}
        gameResRootPath = "/mnt/lake/games/JA2"
        externalizedDataPath = "/home/user/src/ja2-stracciatella/externalized"
        cm = 0x28f3fa0
        exeFolder = "/home/user/src/ja2-stracciatella"
        version = GV_ENGLISH
        configFolderPath = "/home/user/.ja2"
        configPath = "/home/user/.ja2/ja2.ini"

instead we have on thread 2:

#0  0x00007f07a2f9391d in poll () from /usr/lib/libc.so.6
No symbol table info available.
#1  0x00007f079ee64d46 in ?? () from /usr/lib/libasound.so.2
No symbol table info available.
#2  0x00007f079ee690ae in ?? () from /usr/lib/libasound.so.2
No symbol table info available.
#3  0x00007f079ee7458b in snd_pcm_mmap_writei () from /usr/lib/libasound.so.2
No symbol table info available.
#4  0x00007f07a3ccf065 in ?? () from /usr/lib/libSDL-1.2.so.0
No symbol table info available.
#5  0x00007f07a3ca3c90 in ?? () from /usr/lib/libSDL-1.2.so.0
No symbol table info available.
#6  0x00007f07a3cabe78 in ?? () from /usr/lib/libSDL-1.2.so.0
No symbol table info available.
#7  0x00007f07a3cecb09 in ?? () from /usr/lib/libSDL-1.2.so.0
No symbol table info available.
#8  0x00007f07a3a860a2 in start_thread () from /usr/lib/libpthread.so.0
No symbol table info available.
#9  0x00007f07a2f9c3dd in clone () from /usr/lib/libc.so.6
No symbol table info available.

And on thread 3:

#0  0x00007f07a3a8d12d in nanosleep () from /usr/lib/libpthread.so.0
No symbol table info available.
#1  0x00007f07a3ceef69 in SDL_Delay () from /usr/lib/libSDL-1.2.so.0
No symbol table info available.
#2  0x00007f07a3ceefa2 in ?? () from /usr/lib/libSDL-1.2.so.0
No symbol table info available.
#3  0x00007f07a3cabe78 in ?? () from /usr/lib/libSDL-1.2.so.0
No symbol table info available.
#4  0x00007f07a3cecb09 in ?? () from /usr/lib/libSDL-1.2.so.0
No symbol table info available.
#5  0x00007f07a3a860a2 in start_thread () from /usr/lib/libpthread.so.0
No symbol table info available.
#6  0x00007f07a2f9c3dd in clone () from /usr/lib/libc.so.6
No symbol table info available.

I might be wrong, but that SDL_Delay smells very bad here...