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#define N 20
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#include "limits.h"
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volatile int A[N];
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void bar (int n) {
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int i;
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__sync_synchronize();
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i = 0;
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do {
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A[0] = i;
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++i;
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} while (i < 2 * n);
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__sync_synchronize();
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}
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int main () {
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A[0] = 0;
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bar (N/2);
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if (A[0] == N - 1 )
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return 0;
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else
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return 1;
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}
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