Add Locking calls to file_io.h plus implementations and test

util/test/thread_posix.cc

Index: util/test/thread_posix.cc
diff --git a/util/win/time_test.cc b/util/test/thread_posix.cc
similarity index 55%
copy from util/win/time_test.cc
copy to util/test/thread_posix.cc
index ad0771e38b7889ab92154490845a0c3aafe13782..3a908845c925d0105b39375e949defd9ea767e29 100644
--- a/util/win/time_test.cc
+++ b/util/test/thread_posix.cc
@@ -12,23 +12,33 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "util/win/time.h"
+#include "util/test/thread.h"
 
 #include "gtest/gtest.h"
+#include "util/test/errors.h"
 
 namespace crashpad {
 namespace test {
-namespace {
 
-TEST(Time, Reasonable) {
-  timeval t;
-  GetTimeOfDay(&t);
-  // Assume that time's time_t return is seconds from 1970.
-  time_t approx_now = time(nullptr);
-  EXPECT_GE(approx_now, t.tv_sec);
-  EXPECT_LT(approx_now - 100, t.tv_sec);
+void Thread::Start() {
+  ASSERT_FALSE(platform_thread_);
+  int rv = pthread_create(&platform_thread_, nullptr, ThreadEntryThunk, this);
+  ASSERT_EQ(0, rv) << ErrnoMessage(rv, "pthread_create");
+}
+
+void Thread::Join() {
+  ASSERT_TRUE(platform_thread_);
+  int rv = pthread_join(platform_thread_, nullptr);
+  EXPECT_EQ(0, rv) << ErrnoMessage(rv, "pthread_join");
+  platform_thread_ = 0;
+}
+
+// static
+void* Thread::ThreadEntryThunk(void* argument) {
+  Thread* self = reinterpret_cast<Thread*>(argument);
+  self->ThreadMain();
+  return nullptr;
 }
 
-}  // namespace
 }  // namespace test
 }  // namespace crashpad