copyprivate
Specifies that one or more variables should be shared among all threads.
copyprivate(var)
Remarks
where,
- var
One or more variables to share. If more than one variable is specified, separate variable names with a comma.
Remarks
copyprivate applies to the single directive.
For more information, see 2.7.2.8 copyprivate.
Example
// omp_copyprivate.cpp
// compile with: /openmp
#include <stdio.h>
#include <omp.h>
float x, y, fGlobal = 1.0;
#pragma omp threadprivate(x, y)
float get_float() {
fGlobal += 0.001;
return fGlobal;
}
void use_float(float f, int t) {
printf_s("Value = %f, thread = %d\n", f, t);
}
void CopyPrivate(float a, float b) {
#pragma omp single copyprivate(a, b, x, y)
{
a = get_float();
b = get_float();
x = get_float();
y = get_float();
}
use_float(a, omp_get_thread_num());
use_float(b, omp_get_thread_num());
use_float(x, omp_get_thread_num());
use_float(y, omp_get_thread_num());
}
int main() {
float a = 9.99, b = 123.456;
printf_s("call CopyPrivate from a single thread\n");
CopyPrivate(9.99, 123.456);
printf_s("call CopyPrivate from a parallel region\n");
#pragma omp parallel
{
CopyPrivate(a, b);
}
}
call CopyPrivate from a single thread Value = 1.001000, thread = 0 Value = 1.002000, thread = 0 Value = 1.003000, thread = 0 Value = 1.004000, thread = 0 call CopyPrivate from a parallel region Value = 1.005000, thread = 0 Value = 1.005000, thread = 1 Value = 1.006000, thread = 0 Value = 1.006000, thread = 1 Value = 1.007000, thread = 0 Value = 1.007000, thread = 1 Value = 1.008000, thread = 0 Value = 1.008000, thread = 1