What do you mean by "trigger itself to run"? For a program to trigger anything, it must run. It can't do anything, unless it runs. And since you specifically disallow another program to do this triggering, it isn't at all clear to me what you mean.

For a program that sleeps, there are two, and only two, ways of how it can be awakened: it reaches the end of the interval it went asleep for, or it caught a signal (and with some implementation of sleep, this is the same thing).

Perhaps you could explain what your ultimate goal is?

Abigail

---

---

• Are you posting in the right place? Check out Where do I post X? to know for sure.
• Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:

  <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>

• Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
• Want more info? How to link or How to display code and escape characters are good places to start.