libc/test/src/sched/cpu_count_test.cpp

   1 //===-- Unittests for __sched_cpu_count -----------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/__support/OSUtil/syscall.h"
  10 #include "src/errno/libc_errno.h"
  11 #include "src/sched/sched_getaffinity.h"
  12 #include "src/sched/sched_getcpucount.h"
  13 #include "test/UnitTest/ErrnoSetterMatcher.h"
  14
  15 #include <sched.h>
  16 #include <sys/syscall.h>
  17
  18 TEST(LlvmLibcSchedCpuCountTest, SmokeTest) {
  19   cpu_set_t mask;
  20   libc_errno = 0;
  21   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
  22   pid_t tid = LIBC_NAMESPACE::syscall_impl<pid_t>(SYS_gettid);
  23   ASSERT_GT(tid, pid_t(0));
  24   ASSERT_THAT(LIBC_NAMESPACE::sched_getaffinity(tid, sizeof(cpu_set_t), &mask),
  25               Succeeds(0));
  26
  27   // CPU_COUNT is a macro, but it expands to an LLVM-libc internal function that
  28   // needs to be in the appropriate namespace for the test.
  29   int num_cpus = LIBC_NAMESPACE::CPU_COUNT(&mask);
  30   ASSERT_GT(num_cpus, 0);
  31   ASSERT_LE(num_cpus, int(sizeof(cpu_set_t) * sizeof(unsigned long)));
  32 }