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34 lines
1.0 KiB
C
34 lines
1.0 KiB
C
// RUN: %libomptarget-compile-run-and-check-generic
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// REQUIRES: unified_shared_memory
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// UNSUPPORTED: clang-6, clang-7, clang-8, clang-9
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#include <assert.h>
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#include <omp.h>
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#include <stdio.h>
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#pragma omp requires unified_shared_memory
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int main(int argc, char *argv[]) {
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int dev = omp_get_default_device();
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int x = 10;
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int *x_dev = (int *)omp_target_alloc(sizeof x, dev);
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assert(x_dev && "expected omp_target_alloc to succeed");
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int rc = omp_target_associate_ptr(&x, x_dev, sizeof x, 0, dev);
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assert(!rc && "expected omp_target_associate_ptr to succeed");
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// To determine whether x needs to be transferred, the runtime cannot simply
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// check whether unified shared memory is enabled and the 'close' modifier is
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// specified. It must check whether x was previously placed in device memory
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// by, for example, omp_target_associate_ptr.
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#pragma omp target map(always, tofrom : x)
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x += 1;
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// CHECK: x=11
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printf("x=%d\n", x);
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// CHECK: present: 1
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printf("present: %d\n", omp_target_is_present(&x, dev));
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return 0;
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}
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