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POparallel task in tbb
 

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    <p>I have the following function that I want to run as parallel tasks:</p> <pre><code>void WuManberFinder::find() </code></pre> <p>so I wrote the following:</p> <pre><code>void WuManberFinder::Parallel_find() { tbb::task_group g; for(auto i = 0; i != tbb::tbb_thread::hardware_concurrency(); ++i) { g.run(find); } g.wait(); } </code></pre> <p>but it gives me the following errors:</p> <pre><code>wumanber.cc:139:17: error: no matching function for call to ‘tbb::task_group::run(&lt;unresolved overloaded function type&gt;)’ wumanber.cc:139:17: note: candidates are: /usr/include/tbb/task_group.h:209:10: note: void tbb::task_group::run(const F&amp;) [with F = void (thru::matching::WuManberFinder::*)()] /usr/include/tbb/task_group.h:209:10: note: no known conversion for argument 1 from ‘&lt;unresolved overloaded function type&gt;’ to ‘void (thru::matching::WuManberFinder::* const&amp;)()’ /usr/include/tbb/task_group.h:151:10: note: template&lt;class F&gt; void tbb::internal::task_group_base::run(tbb::task_handle&lt;F&gt;&amp;) </code></pre> <p>Here is the serial code (not complete yet):</p> <pre><code> void WuManberFinder::find() { while(m_pos &lt;= m_text2.size()) { string bgram = m_text2.substr(m_pos - m_B, m_B); shift_type::iterator i = m_shift.find(bgram); if (i == m_shift.end()) {// shared variable lock m_pos += m_lmin - m_B + 1; }// unlock else { if (i-&gt;second == 0) { vector&lt;size_t&gt;&amp; list = m_hash[bgram]; // Verify all patterns in list against the text. //shared variable lock ++m_pos; //unlock for (size_t j = 0; j &lt; list.size(); ++j) { string const&amp; str = m_patterns[list[j]]; m_find_pos = m_pos - str.size() - 1; size_t k = 0; for (; k &lt; str.size(); ++k) if (str[k] != m_text2[m_find_pos + k]) break; if (k == str.size()) { m_find_pattern_index = list[j]; // cout &lt;&lt; "***" &lt;&lt; m_patterns[m_find_pattern_index] &lt;&lt;endl; // return true // shared variable lock m_intrusions++; // unlock } } } else { // access m_pos shared critical section m_pos += i-&gt;second; } // access m_pos shared critical section } } // return false; nothing found } </code></pre> <p>I know this might seem weird, but the main idea is I want multiple tasks of this type to traverse a string. The shared variable is <code>pos</code>. Could you give me a hint?</p>
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    1. USRafał Rawicki
    1. USaTm
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    1. COI don't think this is what you want to do. Please show us what exactly find does.
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      1. USronag
    2. COMy suspicions too. Since TBB introduced the explicit threading constructs (in 3.0?), TBB newcomers are drawn to them like moths to a flame rather than figuring out how to work within the task-parallel work-stealing framework.
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      1. UStimday
    3. COhere i edited it
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      1. USaTm
 

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