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