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From: helmut.zeisel_at_[hidden]
Date: 2001-10-11 10:04:59

--- In boost_at_y..., Karl Pitrich <pit_at_r...> wrote:

> libs/thread/build/../src/once.cpp:88: cannot convert `void (*) ()'
> to
> `const void *' for argument `2' to `pthread_setspecific (unsigned
> int,
> const void *)'

I did not yet comile once.cpp before, but tried it now:

GCC 3.0.1 is more informative:

home/helmut/dev/mylibs/boost/libs/thread/src/once.cpp: In function
/home/helmut/dev/mylibs/boost/libs/thread/src/once.cpp:41: ISO C++
   casting between pointer-to-function and pointer-to-object
/home/helmut/dev/mylibs/boost/libs/thread/src/once.cpp: In function
   boost::call_once(void (*)(), once_flag&)':
/home/helmut/dev/mylibs/boost/libs/thread/src/once.cpp:88: cannot
convert `void
   (*)()' to `const void*' for argument `2' to `int
   pthread_setspecific(unsigned int, const void*)'

As I understand, this might be a real problem:

A pointer to a function is needed as thread specific data,
pthreads assumes that all data can be casted to void*,
and ISO C++ forbids
casting between pointer-to-function and pointer-to-object :-(


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