atomic Directive
Ensures that a storage location updates atomically instead of allowing multiple threads to write to it simultaneously.
Binding thread set: all threads
Format
#pragma omp atomic newline
expression statment
Example
void a16(float *x, float *y, int *index, int n)
{
int i;
#pragma omp parallel for shared(x, y, index, n)
for (i=0; i<n; i++)
{
#pragma omp atomic
x[index[i]] += work1(i);
y[i] += work2(i);
}
}