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Viewing changes to callgrind/tests/threads.c

  • Committer: Bazaar Package Importer
  • Author(s): Sebastian Dröge
  • Date: 2006-06-26 00:17:17 UTC
  • mto: This revision was merged to the branch mainline in revision 11.
  • Revision ID: james.westby@ubuntu.com-20060626001717-qi51nzty57cb12q6
Tags: upstream-3.2.0
Import upstream version 3.2.0

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callgrind/tests/threads.c
 
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/* A simple example with 4 threads */
 
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#include <pthread.h>
 
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#include <unistd.h>
 
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double a[1000];
 
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static void init()
 
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{
 
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        int i;
 
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        for(i=0;i<1000;i++) a[i] = (double)i;
 
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}
 
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static void *th(void *v)
 
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{
 
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        double sum = 0.0;
 
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        int i,j;
 
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        for(j=0;j<1000;j++)
 
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                for(i=0;i<1000;i++)
 
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                        sum += a[i];
 
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        *( (double*)v ) = sum;
 
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        /* make sure that no threads is so fast that it finishes
 
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         * before last thread is created, thus reusing the TID */
 
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        sleep(1);
 
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        return 0;
 
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}
 
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int main()
 
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{
 
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        pthread_t t[4];
 
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        double sum[4];
 
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        int i;
 
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        init();
 
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        for(i=0;i<4;i++)
 
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                pthread_create(&t[i], NULL, th, &sum[i]);       
 
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        for(i=0;i<4;i++)
 
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                pthread_join(t[i], NULL);
 
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        return 0;
 
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}