zzby0 commented on code in PR #9923:
URL: https://github.com/apache/nuttx/pull/9923#discussion_r1278796260
##########
sched/signal/sig_procmask.c:
##########
@@ -187,8 +187,27 @@ int nxsig_procmask(int how, FAR const sigset_t *set, FAR
sigset_t *oset)
int sigprocmask(int how, FAR const sigset_t *set, FAR sigset_t *oset)
{
+ sigset_t nset;
int ret;
+ /* SIGKILL and SIGSTOP should not be added to signal mask */
+
+ if (set != NULL)
+ {
+ nset = *set;
+ if (nxsig_ismember(&nset, SIGKILL))
+ {
+ nxsig_delset(&nset, SIGKILL);
+ }
+
+ if (nxsig_ismember(&nset, SIGSTOP))
+ {
+ nxsig_delset(&nset, SIGSTOP);
+ }
+
Review Comment:
> The nxsig_delset() is rather expensive; nxsig_member not so much. The code
is fine here, but you might want to consider using a single nxsig_nandset. I am
not sure if that is an improvment or not.
nxsig_delset() requires only one operation, but nxsig_nandset() needs to
traverse the entire set. Maybe nxsig_delset() is not such expensive?
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