Andreas Goebel schrieb:
Hi,
I´m still at searching why apps that use fbo crash on mingw.
As the msvc-binaries work I look for differences between mingw and
msvc. One of them is threads. In the mingw-faq it says that you
shouldn´t use CreateThread:
______________________MINGW_FAQ
As MinGW uses the standard Microsoft C runtime library which comes
with Windows, you should be careful and use the correct function to
generate a new thread. In particular, the CreateThread function will
not setup the stack correctly for the C runtime library. You should
use _beginthreadex instead, which is (almost) completely compatible
with CreateThread.
Failure to do this will lead to a small loss of memory if you use a
large number of threads. However, it can also lead to the stack
becoming misaligned, with disasterous consequences if MinGW starts
emitting SSE instructions. In particular, the movaps instruction
assumes that memory is aligned to a 16-byte boundary. MinGW (or,
rather, the GCC compiler) handles this, but it assumes that the stack
starts on a 16-byte boundary. Using _beginthreadex ensures this.
I believe that if you do not wish to use any C library functions, then
CreateThread will work fine. However, _beginthreadex does the same
job, and is safer.
______________________END_MINGW_FAQ
I tried to change the OpenThreads code to use _beginthreadex, but I
got those errors:
../Win32Thread.cpp: In static member function `static void
OpenThreads::ThreadPrivateActions::PrintThreadSchedulingInfo(OpenThreads::Thread*)':
../Win32Thread.cpp:133: warning: unused variable 'pd'
../Win32Thread.cpp: In member function `int
OpenThreads::Thread::start()':
../Win32Thread.cpp:328: error: invalid conversion from `long unsigned
int (*)(void*)' to `unsigned int (*)(void*)'
../Win32Thread.cpp:328: error: initializing argument 3 of `long
unsigned int _beginthreadex(void*, unsigned int, unsigned int
(*)(void*), void*, unsigned int, unsigned int*)'
../Win32Thread.cpp:328: error: invalid conversion from `long unsigned
int*' to `unsigned int*'
../Win32Thread.cpp:328: error: initializing argument 6 of `long
unsigned int _beginthreadex(void*, unsigned int, unsigned int
(*)(void*), void*, unsigned int, unsigned int*)'
../Win32Thread.cpp:328: error: invalid conversion from `long unsigned
int' to `void*'
../Win32Thread.cpp:328: error: initializing argument 1 of `void
OpenThreads::HandleHolder::set(void*)'
I don´t know what unsigned int (*)(void*) is (I´m embarrased about it,
but I usually only program C++ and have seldom to do with void*) and
how I could cast that to work.
Ok, I´ve managed to change this (by changing some longs to ints), it
compiles fine, but it doesn´t help anything.
Sigh.....
Regards,
Andreas
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