static int SR_initialize() {

  {- -------------------------------------------
  (1) (変数宣言など)
      ---------------------------------------- -}

      struct sigaction act;
      char *s;

  {- -------------------------------------------
  (1) _JAVA_SR_SIGNUM 環境変数が指定されていれば, 
      SR_signum(= suspend/resume に使用するシグナル番号) を指定の値に変更しておく.
      ---------------------------------------- -}

      /* Get signal number to use for suspend/resume */
      if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
        int sig = ::strtol(s, 0, 10);
        if (sig > 0 || sig < _NSIG) {
            SR_signum = sig;
        }
      }

  {- -------------------------------------------
  (1) (assert)
      ---------------------------------------- -}

      assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
            "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");

  {- -------------------------------------------
  (1) sigaction() を呼んで, SR_signum 用のシグナルハンドラとして SR_handler() を登録する.
      ---------------------------------------- -}

      sigemptyset(&SR_sigset);
      sigaddset(&SR_sigset, SR_signum);

      /* Set up signal handler for suspend/resume */
      act.sa_flags = SA_RESTART|SA_SIGINFO;
      act.sa_handler = (void (*)(int)) SR_handler;

      // SR_signum is blocked by default.
      // 4528190 - We also need to block pthread restart signal (32 on all
      // supported Linux platforms). Note that LinuxThreads need to block
      // this signal for all threads to work properly. So we don't have
      // to use hard-coded signal number when setting up the mask.
      pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);

      if (sigaction(SR_signum, &act, 0) == -1) {
        return -1;
      }

  {- -------------------------------------------
  (1) 
      ---------------------------------------- -}

      // Save signal flag
      os::Linux::set_our_sigflags(SR_signum, act.sa_flags);
      return 0;
    }