/usr/share/systemtap/tapset
Edit: /usr/share/systemtap/tapset/speculative.stp (1746B)
// Speculative tapset
// Copyright (C) 2011-2015 Red Hat Inc.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
@__private30 global _spec_id
@__private30 global _spec_counter%
@__private30 global _spec_buff%
/**
* sfunction speculation - Allocate a new id for speculative output
*
* The speculation() function is called when a new speculation buffer is needed.
* It returns an id for the speculative output.
* There can be multiple threads being speculated on concurrently.
* This id is used by other speculation functions to keep the threads
* separate.
*/
function speculation:long ()
{
_spec_id += 1
return _spec_id
}
/**
* sfunction speculate - Store a string for possible output later
* @id: buffer id to store the information in
* @output: string to write out when commit occurs
*
* Add a string to the speculaive buffer for id.
*/
function speculate (id:long, output:string)
{
_spec_counter[id] += 1
_spec_buff[id, _spec_counter[id]] = output
}
/**
* sfunction discard - Discard all output related to a speculation buffer
* @id: of the buffer to store the information in
*
*/
function discard (id:long)
{
delete _spec_buff[id,*]
}
/**
* sfunction commit - Write out all output related to a speculation buffer
* @id: of the buffer to store the information in
*
* Output all the output for @id in the order that it was entered into
* the speculative buffer by speculative().
*/
function commit (id:long)
{
foreach([i, counter+] in _spec_buff [id,*]) {
printf("%s", _spec_buff[i, counter])
}
delete _spec_buff[id,*]
}