SYS_sigprocmask   101 gc/solaris_threads.c     syscall(SYS_sigprocmask, SIG_SETMASK, &set, &old_mask);
SYS_sigprocmask   106 gc/solaris_threads.c     syscall(SYS_sigprocmask, SIG_SETMASK, &old_mask, NULL);