+#printf -- POSIX thread cancellation point
+#putc -- POSIX thread cancellation point
+#putchar -- POSIX thread cancellation point
+#puts -- POSIX thread cancellation point
+#putwc -- POSIX thread cancellation point
+#putwchar -- POSIX thread cancellation point
+#qsort -- calls user function which may throw exception
+#raise -- synchronous exception from signal handler