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#include "test/cpp/qps/limit_cores.h"

#include <grpc/support/cpu.h>
#include <grpc/support/log.h>
#include <grpc/support/port_platform.h>
#include <vector>

namespace grpc {
namespace testing {

#ifdef GPR_CPU_LINUX
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <sched.h>
int LimitCores(std::vector<int> cores) {
  size_t num_cores = static_cast<size_t>(gpr_cpu_num_cores());
  if (num_cores > cores.size()) {
    cpu_set_t *cpup = CPU_ALLOC(num_cores);
    GPR_ASSERT(cpup);
    size_t size = CPU_ALLOC_SIZE(num_cores);
    CPU_ZERO_S(size, cpup);

    for (size_t i = 0; i < cores.size(); i++) {
      CPU_SET_S(cores[i], size, cpup);
    }
    GPR_ASSERT(sched_setaffinity(0, size, cpup) == 0);
    CPU_FREE(cpup);
    return cores.size();
  } else {
    return num_cores;
  }
}
#else
// LimitCores is not currently supported for non-Linux platforms
int LimitCores(std::vector<int> core_vec) { return gpr_cpu_num_cores(); }
#endif
}  // namespace testing
}  // namespace grpc