+unspecified: owner thread of locked recursive/errorchecking mutex exits,
+then another thread with same thread id locks it again
+
+scandir: cmp type (qsort cannot be used), non-total order?
+
+pow: iso c cases:
+ pow((+-)0, y) returns (+-)(inf) and raises the ''divide-by-zero'' floating-point exception for y an odd integer < 0.
+ pow((+-)0, y) returns +(inf) and raises the ''divide-by-zero'' floating-point exception for y < 0 and not an odd integer.
+"For y < 0, if x is zero, .. +-HUGE_VAL .." should be "For y < 0, if x is +-0,"