sandbox/linux/services/thread_helpers_unittests.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "sandbox/linux/services/thread_helpers.h"
   6
   7 #include <errno.h>
   8 #include <fcntl.h>
   9 #include <sys/stat.h>
  10 #include <sys/types.h>
  11 #include <unistd.h>
  12
  13 #include "base/basictypes.h"
  14 #include "base/logging.h"
  15 #include "base/memory/scoped_ptr.h"
  16 #include "base/posix/eintr_wrapper.h"
  17 #include "base/process/process_metrics.h"
  18 #include "base/threading/platform_thread.h"
  19 #include "base/threading/thread.h"
  20 #include "build/build_config.h"
  21 #include "sandbox/linux/tests/unit_tests.h"
  22 #include "testing/gtest/include/gtest/gtest.h"
  23
  24 using base::PlatformThread;
  25
  26 namespace sandbox {
  27
  28 namespace {
  29
  30 // These tests fail under ThreadSanitizer, see http://crbug.com/342305
  31 #if !defined(THREAD_SANITIZER)
  32
  33 int GetRaceTestIterations() {
  34   if (IsRunningOnValgrind()) {
  35     return 2;
  36   } else {
  37     return 1000;
  38   }
  39 }
  40
  41 class ScopedProc {
  42  public:
  43   ScopedProc() : fd_(-1) {
  44     fd_ = open("/proc/", O_RDONLY | O_DIRECTORY);
  45     CHECK_LE(0, fd_);
  46   }
  47
  48   ~ScopedProc() { PCHECK(0 == IGNORE_EINTR(close(fd_))); }
  49
  50   int fd() { return fd_; }
  51
  52  private:
  53   int fd_;
  54   DISALLOW_COPY_AND_ASSIGN(ScopedProc);
  55 };
  56
  57 TEST(ThreadHelpers, IsSingleThreadedBasic) {
  58   ScopedProc proc_fd;
  59   ASSERT_TRUE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
  60   ASSERT_TRUE(ThreadHelpers::IsSingleThreaded());
  61
  62   base::Thread thread("sandbox_tests");
  63   ASSERT_TRUE(thread.Start());
  64   ASSERT_FALSE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
  65   ASSERT_FALSE(ThreadHelpers::IsSingleThreaded());
  66   // Explicitly stop the thread here to not pollute the next test.
  67   ASSERT_TRUE(ThreadHelpers::StopThreadAndWatchProcFS(proc_fd.fd(), &thread));
  68 }
  69
  70 SANDBOX_TEST(ThreadHelpers, AssertSingleThreaded) {
  71   ScopedProc proc_fd;
  72   SANDBOX_ASSERT(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
  73   SANDBOX_ASSERT(ThreadHelpers::IsSingleThreaded());
  74
  75   ThreadHelpers::AssertSingleThreaded(proc_fd.fd());
  76   ThreadHelpers::AssertSingleThreaded();
  77 }
  78
  79 TEST(ThreadHelpers, IsSingleThreadedIterated) {
  80   ScopedProc proc_fd;
  81   ASSERT_TRUE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
  82
  83   // Iterate to check for race conditions.
  84   for (int i = 0; i < GetRaceTestIterations(); ++i) {
  85     base::Thread thread("sandbox_tests");
  86     ASSERT_TRUE(thread.Start());
  87     ASSERT_FALSE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
  88     // Explicitly stop the thread here to not pollute the next test.
  89     ASSERT_TRUE(ThreadHelpers::StopThreadAndWatchProcFS(proc_fd.fd(), &thread));
  90   }
  91 }
  92
  93 TEST(ThreadHelpers, IsSingleThreadedStartAndStop) {
  94   ScopedProc proc_fd;
  95   ASSERT_TRUE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
  96
  97   base::Thread thread("sandbox_tests");
  98   // This is testing for a race condition, so iterate.
  99   // Manually, this has been tested with more that 1M iterations.
 100   for (int i = 0; i < GetRaceTestIterations(); ++i) {
 101     ASSERT_TRUE(thread.Start());
 102     ASSERT_FALSE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
 103
 104     ASSERT_TRUE(ThreadHelpers::StopThreadAndWatchProcFS(proc_fd.fd(), &thread));
 105     ASSERT_TRUE(ThreadHelpers::IsSingleThreaded(proc_fd.fd()));
 106     ASSERT_EQ(1, base::GetNumberOfThreads(base::GetCurrentProcessHandle()));
 107   }
 108 }
 109
 110 SANDBOX_TEST(ThreadHelpers, AssertSingleThreadedAfterThreadStopped) {
 111   SANDBOX_ASSERT(ThreadHelpers::IsSingleThreaded());
 112
 113   base::Thread thread1("sandbox_tests");
 114   base::Thread thread2("sandbox_tests");
 115
 116   for (int i = 0; i < GetRaceTestIterations(); ++i) {
 117     SANDBOX_ASSERT(thread1.Start());
 118     SANDBOX_ASSERT(thread2.Start());
 119     SANDBOX_ASSERT(!ThreadHelpers::IsSingleThreaded());
 120
 121     thread1.Stop();
 122     thread2.Stop();
 123     // This will wait on /proc/ to reflect the state of threads in the
 124     // process.
 125     ThreadHelpers::AssertSingleThreaded();
 126     SANDBOX_ASSERT(ThreadHelpers::IsSingleThreaded());
 127   }
 128 }
 129
 130 // Only run this test in Debug mode, where AssertSingleThreaded() will return
 131 // in less than 64ms.
 132 #if !defined(NDEBUG)
 133 SANDBOX_DEATH_TEST(
 134     ThreadHelpers,
 135     AssertSingleThreadedDies,
 136     DEATH_MESSAGE(
 137         ThreadHelpers::GetAssertSingleThreadedErrorMessageForTests())) {
 138   base::Thread thread1("sandbox_tests");
 139   SANDBOX_ASSERT(thread1.Start());
 140   ThreadHelpers::AssertSingleThreaded();
 141 }
 142 #endif  // !defined(NDEBUG)
 143
 144 #endif  // !defined(THREAD_SANITIZER)
 145
 146 }  // namespace
 147
 148 }  // namespace sandbox