ruby-c-extension

I have a problem with using threads in a C Extension to run ruby code async. I have the following C code: struct DATA { VALUE callback; pthread_t watchThread; void *ptr; }; void *executer(void *ptr) { struct DATA *data = (struct DATA *) ptr; char oldVal[20] = "1"; char newVal[20] = "1"; pthread_cleanup_push(&threadGarbageCollector, data); while(1) { if(triggerReceived) { rb_funcall(data->callback, rb_intern("call"), 0); } } pthread_cleanup_pop(1); return NULL; } VALUE spawn_thread(VALUE self) { VALUE block; struct DATA *data; Data_Get_Struct(self, struct DATA, data); block = rb_block_proc();

I'm trying to make a standalone FFT extension for ruby in C, based on this recipe I've noted several methods for passing different values between ruby and c. However im fairly new to both ruby and C and can't work out how to copy an array from a VALUE ruby object into a C array. The compilation error: SimpleFFT.c:47: error: subscripted value is neither array nor pointer And the code: #include "ruby.h" #include "fft.c" // the c file I wish to wrap in ruby VALUE SimpleFFT = Qnil; void Init_simplefft(); VALUE method_rfft(VALUE self, VALUE anObject); void Init_simplefft() { SimpleFFT = rb_define