question about function pointer compile error

I have a program which was coded by mix of c++ and c code, when I test the function pointer in C code, it is ok, but when I try to merge it with C++ code, it give me compile error like this:

gcc -g -Wall -D_GNU_SOURCE -DDEBUG -c wmain.cpp
wmain.cpp:42: invalid conversion from `void*(*)(void*)' to `void (*)(void*)'
wmain.cpp:42: invalid conversion from `void*(*)(void*)' to `void (*)(void*)'
wmain.cpp:42: invalid conversion from `void*(*)(void*)' to `void (*)(void*)'
wmain.cpp: In function `int main(int, char**)':
wmain.cpp:97: invalid conversion from `void (*)(void*)' to `void*(*)(void*)'
gmake: *** [wmain.o] Error 1

Here it is the snapshot of my two files (one is the header file to define the function pointer)

In threadhandler.h

#ifdef __cplusplus
extern "C" {
#endif

......

#define MSG1 1
#define MSG2 2
#define MSG3 3


extern void *PrintHello1(void *params);
extern void *PrintHello2(void *params);
extern void *PrintHello3(void *params);

typedef void (*Func)(void *);

struct PrintHi {
int msg;
Func funcptr;
};

#ifdef __cplusplus
}
#endif

In wmain.cpp

......

struct PrintHi PrintHiTable[3] = {
{ MSG1, PrintHello1 },
{ MSG2, PrintHello2 },
{ MSG3, PrintHello3 }
}; // here it is the LINE 42

int main(int argc, char *argv[])
{

......

for (i=0; i< NUM_THREADS; i++) {

......

pthread_create(&threads[i], NULL, PrintHiTable[i].funcptr, (void *) &thread_data_array[i]); // here it is the LINE 97

}

}

Please let me know if you have any good solution.
Thanks.

You want your functions to return void instead of void *. So change:

extern void *PrintHello1(void *params);

to:

extern void PrintHello1(void *params);

...for all 3 functions.

Try changing this:

typedef void (*Func)(void *);

to this:

typedef void* (*Func)(void *);

Originally posted by itsme86 You want your functions to return void instead of void *. So change: extern void *PrintHello1(void *params); to: extern void PrintHello1(void *params); ...for all 3 functions.

I was going to suggest that at first too, but apparently pthread_create wants a start routine that returns void*.... It uses that return value as a parameter to pthread_exit(void *value_ptr);

Neither two of the suggestion work, since the PrintHello1 (to 3) will be thread function, so it must be defined as void *, but thanks for your reply.
I still wait to find the solution.

My suggestion doesn't suggest changing the return type of your PrintHello1. Your typedef is a typedef to a function that returns a void not a void*, so you have a mismatch there.