dtrace_helpers
dtrace_helpers++;
ASSERT(dtrace_helpers > 0);
--dtrace_helpers;
ASSERT(dtrace_helpers > 0);
if (dtrace_helpers > 0) {
static int dtrace_helpers; /* number of helpers */
struct dtrace_helpers *dthps_next; /* next pointer */
struct dtrace_helpers *dthps_prev; /* prev pointer */