awk print in script Post: 302976068

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pw_post

postwait(2)							System Calls Manual						       postwait(2)

NAME

       postwait: pw_getukid(), pw_wait(), pw_post(), pw_postv(), pw_getvmax() - lightweight synchronization mechanism

SYNOPSIS

DESCRIPTION

       Postwait  is  a fast, lightweight sleep/wakeup mechanism that can be used for synchronization by cooperating kernel threads within a single
       process or between separate processes.

       A thread calls to block.  It resumes execution when it is posted by another thread, the call expires, or is signaled.  If one or more posts
       are already pending, returns immediately.

       Threads	using postwait are identified by their ukid.  A thread retrieves its ukid by calling It shares this ukid with anyone it chooses by
       any means it considers appropriate (for example, shared memory).

       is called with a timeout ts.  If ts is NULL, the thread will not timeout.  It will remain blocked until posted or a signal wakes it up.

       If ts points to a zero-valued timespec, will return immediately with a value (and indicating whether or not it was posted.

       If ts points to a timespec whose value is greater than zero, the thread will block for that amount of time unless it is	posted	or  inter-
       rupted  by a signal, in which case the timespec pointed to by ts is updated with the remaining time.  The return value and are set to indi-
       cate the reason the call returned.

       is used to post many threads with a single call.  It posts to all threads in the targets array.	An value for each target  is  returned	in
       the errors array.  (0 indicates success.)  If the errors pointer is zero, no target-specific errors are copied out.

       There is a maximum number of threads that can be posted with a single call.  This value is returned by

       Posts sent to a kernel thread that already has a post pending against it are discarded.

RETURN VALUE

       returns 0 if it succeeds, -1 otherwise.

       returns 0 if posted, -1 otherwise.

       returns 0 if the post succeeds, -1 otherwise.

       returns 0 if every post succeeds, -1 otherwise.

       returns the maximum number of kernel threads that can be posted with a single call to

ERRORS

       sets to one of the following values if it fails:

	      ukid	     points to an illegal address.  The reliable detection of this error is implementation dependent.

       sets to one of the following values if it fails:

	      was called     with a timeout of 0 but the caller has no post(s) pending.

	      was called     with a timeout that expired.

	      ts	     points to an illegal address.  The reliable detection of this error is implementation dependent.

	      was interrupted
			     by a signal.

	      The	     timespec pointed to by ts is invalid.

       sets to one of the following values if it fails:

	      The	     ukid refers to a non-existent kernel thread.

       sets to one of the following values if it fails:

	      targets	     points to an illegal address.  The reliable detection of this error is implementation dependent.

	      errors	     points to an illegal address.  The reliable detection of this error is implementation dependent.

	      count	     is less than 0.

	      count	     exceeds the maximum value (as returned by

	      A 	     ukid refers to a non-existent kernel thread.

																       postwait(2)