ThreadID printed when Thread terminating in the same format as posix_logger

Summary: 220132b65e correctly fixed the issue of thread ID printing when terminating a thread. Nothing wrong with it. This diff prints the ID in the same way as in PosixLogger::logv() so that users can be more easily to correlates them.

Test Plan: run env_test and make sure it prints correctly.

Reviewers: igor, haobo, ljin, yhchiang

Reviewed By: yhchiang

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D18819

util/env_posix.cc

@@ -94,17 +94,6 @@ static Status IOError(const std::string& context, int err_number) {
   return Status::IOError(context, strerror(err_number));
 }
 
-// TODO(sdong): temp logging. Need to help debugging. Remove it when
-// the feature is proved to be stable.
-inline void PrintThreadInfo(size_t thread_id, pthread_t id) {
-  unsigned char* ptc = (unsigned char*)(void*)(&id);
-  fprintf(stdout, "Bg thread %zu terminates 0x", thread_id);
-  for (size_t i = 0; i < sizeof(id); i++) {
-    fprintf(stdout, "%02x", (unsigned)(ptc[i]));
-  }
-  fprintf(stdout, "\n");
-}
-
 #ifdef NDEBUG
 // empty in release build
 #define TEST_KILL_RANDOM(rocksdb_kill_odds)
@@ -1293,13 +1282,17 @@ class PosixEnv : public Env {
     return Status::OK();
   }
 
-  static uint64_t gettid() {
-    pthread_t tid = pthread_self();
+  static uint64_t gettid(pthread_t tid) {
     uint64_t thread_id = 0;
     memcpy(&thread_id, &tid, std::min(sizeof(thread_id), sizeof(tid)));
     return thread_id;
   }
 
+  static uint64_t gettid() {
+    pthread_t tid = pthread_self();
+    return gettid(tid);
+  }
+
   virtual Status NewLogger(const std::string& fname,
                            shared_ptr<Logger>* result) {
     FILE* f = fopen(fname.c_str(), "w");
@@ -1525,7 +1518,8 @@ class PosixEnv : public Env {
           PthreadCall("unlock", pthread_mutex_unlock(&mu_));
           // TODO(sdong): temp logging. Need to help debugging. Remove it when
           // the feature is proved to be stable.
-          PrintThreadInfo(thread_id, terminating_thread);
+          fprintf(stdout, "Bg thread %zu terminates %llx\n", thread_id,
+                  static_cast<long long unsigned int>(gettid()));
           break;
         }
         void (*function)(void*) = queue_.front().function;