hi there, the code i submitted some weeks ago about having more than one /dev/input/event-joystick shows from time to time a race condition in IL2 Sturmovik. this game is written in java and somehow exe-fied. so the whole thing is running a boatload of threads. my box is a smp-opteron-system with gentoo and a 2.6.17 kernel.
my problem is the following (in dlls/dinput/joystick_linuxinput.c): the new code calls a method (find_joydevs) on serveral places which checks by a global variable, whether it ran before (have_joydevs) and then builds up a list of the valid devices (joydevs). so what happes there is a struct is filled on the stack and later memcpy-ied to the end of a (re)alloced (HeapAlloc/HeapRealloc) list. things like the device are strdup'ed from the stack into the struct before copy. so in IL2 often - but not always - the have_joydevs has a count > -1, the joydevs has a pointer. but when it access the "struct" behind it, this is uninitialized memory (at least for the device-member) and random errors occur. so what i have tried so far: - put find_joydevs into a critical section - dont use strdup, but HeapAlloc+lstrcpyA nothing helped. the only other thing that came this morning into my mind but i have not yet tried to change, is the fact, that i malloc the string and store the pointer to it in the struct. next thing is a memcpy of the whole struct, which seems ok to my c-knowledge. so if one of the wine gurus has some tips i would be glad to try them out. -- cu
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