jlaitine commented on code in PR #16194:
URL: https://github.com/apache/nuttx/pull/16194#discussion_r2043740058
##########
include/semaphore.h:
##########
@@ -104,8 +104,16 @@ struct semholder_s
struct sem_s
{
- volatile int32_t semcount; /* >0 -> Num counts available */
- /* <0 -> Num tasks waiting for semaphore */
+ union
+ {
+ volatile int32_t semcount; /* >0 -> Num counts available */
+ /* <0 -> Num tasks waiting for semaphore
*/
+ volatile uint32_t mholder; /* == NXMUTEX_NO_HOLDER -> mutex has no
holder */
Review Comment:
Ok, decided to keep it like this for now, explanation below. I think that
mutex holder is *not* an integer, but it is essentially a bit-field (but due to
bitfield ordering is not standard, it is just managed via bitwise
oprations/macros).
So changing that to int32 would be just confusing, I don't really like the
obscure way of first setting the highest bit manually and later checking that
the int has become negative. Obviously works, but again, mholder is not an
integer.
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