jmp_buf size?

[Jay]

What is up with the size of jmp_buf?
It appears that setjmp.h confuses bytes and ints, specifically in the Cygwin case.
_JBLEN should be 13, not 13*4.
or #define _JBTYPE to char, but that doesn't work as easily.


?
 
 
I applied a local hack workaround, something like:
 
 
  typedef unsigned char JBTYPE __attribute(align(4));  
  #define _JBTYPE _JBTYPE 
  #include  
 
 
Though my larger goal, of implementing (deprecated-in-favor-of-pthreads) Posix get/make/set/swapcontext I gave up on anyway, at least via layering over setjmp/longjmp. They may be implementable via Win32 fibers, though the overall thing still perhaps dodgy and useless ("user more threads"...).
 
 
I realize that jmp_buf is something "deep" and system specific, not to be messed with lightly, but I'm also pretty darn certain that Cygwin declares its own jmp_buf incorrectly.
I also realize that larger than needed is safe, "just" wasteful, and possibly "future proof".
It still seems like a mistake.
 

 - Jay

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