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atomic | Microsoft Docs |
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11/04/2016 |
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article |
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275e0338-cf2f-4525-97b5-696250000df7 |
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11 |
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mikeblome |
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mblome |
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ghogen |
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Specifies that a memory location that will be updated atomically.
#pragma omp atomic
expression
expression
The statement containing the lvalue whose memory location you want to protect against multiple writes. For more information about legal expression forms, see the OpenMP specification.
Remarks
The atomic directive supports no OpenMP clauses.
For more information, see 2.6.4 atomic Construct.
// omp_atomic.cpp
// compile with: /openmp
#include <stdio.h>
#include <omp.h>
#define MAX 10
int main() {
int count = 0;
#pragma omp parallel num_threads(MAX)
{
#pragma omp atomic
count++;
}
printf_s("Number of threads: %d\n", count);
}
OpenMP