omp_target_alloc
Purpose
The omp_target_alloc function allocates memory in a device data environment.
Prototype
void* omp_target_alloc(size_t size, int device_num);
Parameters
- size
- Specifies the size in bytes of the storage memory to be allocated.
- device_num
- Must be the device number of the host device or be non-negative and less than the number of target devices.
Usage
Pointer arithmetic is not supported on the device address that is returned by this function.
You can free the storage that is returned by this function only by using the omp_target_free function; otherwise, the compiler behavior is unspecified.
If it cannot allocate the memory in the device data environment dynamically, it returns NULL.
You cannot call this function on a target device. 
