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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - "pure virtual method called" error with std::thread and template function"
href="http://llvm.org/bugs/show_bug.cgi?id=16969">16969</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>"pure virtual method called" error with std::thread and template function
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.2
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++11
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>rodin.alexander@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=11084" name="attach_11084" title="quick_sort function template">attachment 11084</a> <a href="attachment.cgi?id=11084&action=edit" title="quick_sort function template">[details]</a></span>
quick_sort function template
I've created a multithreaded quick sort function:
#include <utility>
#include <thread>
template <typename Iterator>
void quick_sort(Iterator begin, Iterator end, int tc = 4) {
if (begin < end - 1) {
Iterator middle = end - 1;
Iterator left = begin;
while (left != middle) {
if (*left > *middle) {
--middle;
std::swap(*middle, middle[1]);
if (middle != left)
std::swap(middle[1], *left);
} else
++left;
}
if (tc > 1) {
std::thread left_thread(quick_sort<Iterator>, begin, middle, tc /
2);
std::thread right_thread(quick_sort<Iterator>, middle + 1, end, tc
/ 2);
left_thread.join();
right_thread.join();
} else {
quick_sort(begin, middle, 1);
quick_sort(middle + 1, end, 1);
}
}
}
When I run a test program with it, for example
int main() {
double data[] = {0.840188, 0.394383, 0.783099, 0.798440, 0.911647,
0.197551, 0.335223, 0.768230, 0.277775, 0.553970, };
quick_sort(data, sizeof(data) / sizeof(double));
}
the program fails:
$ ./sort
terminate called after throwing an instance of 'std::system_error'
what(): Operation not permitted
Aborted (core dumped)
This code works fine with g++ 4.7.
clang information:
$ clang++ --version
Ubuntu clang version 3.2-1~exp9ubuntu1 (tags/RELEASE_32/final) (based on LLVM
3.2)
Target: x86_64-pc-linux-gnu
Thread model: posix</pre>
</div>
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