tools/pldt/org.eclipse.ptp.pldt.upc/html/upc_all_permute.html

<h2>The <code>upc_all_permute</code> function</h2>

<h4>Synopsis</h4>
<pre>    
    #include &lt;upc.h&gt;
    #include &lt;upc_collective.h&gt;
    void upc_all_permute(shared void * restrict dst,
        shared const void * restrict src,
        shared const int * restrict perm,
        size_t nbytes, upc_flag_t flags);
</pre>
<p>
<h4>Description</h4>
<p>
The <code>upc_all_permute </code>  function 
copies a block of memory from a shared memory
area that has affinity to the ith thread to a block of a shared memory
that has affinity to thread perm[i]. The number of bytes in each block is
<code>nbytes</code>.
<p><code>nbytes</code> must be strictly greater than 0.
<p><code>perm[0..THREADS-1]</code> must contain <code>THREADS</code>
distinct values: 
<code>0, 1, ..., THREADS-1.</code>
<p>The <code>upc_all_permute </code> function treats the <code>src</code> pointer and the <code>dst</code> pointer
as if each pointed to a shared memory area of <code>nbytes</code> bytes on each thread
and therefore had type:
<pre>
    shared [<code>nbytes</code>] char[<code>nbytes</code> * THREADS]
    </pre>
<p>The targets of the <code>src</code>, perm, and <code>dst</code> pointers must have affinity to thread 0.
<p>The <code>src</code> and <code>dst</code> pointers are treated as if they have phase 0.
<p>The effect is equivalent to copying the block of <code>nbytes</code> bytes that has affinity
to thread i pointed to by <code>src</code> to the block of <code>nbytes</code> bytes that has affinity
to thread perm[i] pointed to by <code>dst</code>.
<ul>
<li>EXAMPLE 1: <code>upc_all_permute</code>
<pre>
#include &lt;upc.h&gt;
#include &lt;upc_collective.h&gt;
#define NELEMS 10
shared [NELEMS] int A[NELEMS*THREADS], B[NELEMS*THREADS];
shared int P[THREADS];
// Initialize A and P.
upc_barrier;
upc_all_permute( B, A, P, sizeof(int)*NELEMS,
UPC_IN_NOSYNC | UPC_OUT_NOSYNC );
upc_barrier;
</pre>

</ul>

 
</ul>
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