Remove use of wide characters in stats table identifiers.

base/stats_table.h

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // A StatsTable is a table of statistics.  It can be used across multiple
 // processes and threads, maintaining cheap statistics counters without
 // locking.
 //
 // The goal is to make it very cheap and easy for developers to add
 // counters to code, without having to build one-off utilities or mechanisms
@@ skipping 28 matching lines @@
   // will use the same shared memory segment as the original.  Otherwise,
   // a new StatsTable is created and all counters are zeroed.
   //
   // name is the name of the StatsTable to use.
   //
   // max_threads is the maximum number of threads the table will support.
   // If the StatsTable already exists, this number is ignored.
   //
   // max_counters is the maximum number of counters the table will support.
   // If the StatsTable already exists, this number is ignored.
-  StatsTable(const std::wstring& name, int max_threads, int max_counters);
+  StatsTable(const std::string& name, int max_threads, int max_counters);
 
   // Destroys the StatsTable.  When the last StatsTable is destroyed
   // (across all processes), the StatsTable is removed from disk.
   ~StatsTable();
 
   // For convenience, we create a static table.  This is generally
   // used automatically by the counters.
   static StatsTable* current() { return global_table_; }
 
   // Set the global table for use in this process.
   static void set_current(StatsTable* value) { global_table_ = value; }
 
   // Get the slot id for the calling thread. Returns 0 if no
   // slot is assigned.
   int GetSlot() const;
 
   // All threads that contribute data to the table must register with the
   // table first.  This function will set thread local storage for the
   // thread containing the location in the table where this thread will
   // write its counter data.
   //
   // name is just a debugging tag to label the thread, and it does not
   // need to be unique.  It will be truncated to kMaxThreadNameLength-1
   // characters.
   //
   // On success, returns the slot id for this thread.  On failure,
   // returns 0.
-  int RegisterThread(const std::wstring& name);
+  int RegisterThread(const std::string& name);
 
   // Returns the number of threads currently registered.  This is really not
   // useful except for diagnostics and debugging.
   int CountThreadsRegistered() const;
 
   // Find a counter in the StatsTable.
   //
   // Returns an id for the counter which can be used to call GetLocation().
   // If the counter does not exist, attempts to create a row for the new
   // counter.  If there is no space in the table for the new counter,
   // returns 0.
-  int FindCounter(const std::wstring& name);
+  int FindCounter(const std::string& name);
 
   // TODO(mbelshe): implement RemoveCounter.
 
   // Gets the location of a particular value in the table based on
   // the counter id and slot id.
   int* GetLocation(int counter_id, int slot_id) const;
 
   // Gets the counter name at a particular row.  If the row is empty,
   // returns NULL.
-  const wchar_t* GetRowName(int index) const;
+  const char* GetRowName(int index) const;
 
   // Gets the sum of the values for a particular row.
   int GetRowValue(int index) const;
 
   // Gets the sum of the values for a particular row for a given pid.
   int GetRowValue(int index, int pid) const;
 
   // Gets the sum of the values for a particular counter.  If the counter
   // does not exist, creates the counter.
-  int GetCounterValue(const std::wstring& name);
+  int GetCounterValue(const std::string& name);
 
   // Gets the sum of the values for a particular counter for a given pid.
   // If the counter does not exist, creates the counter.
-  int GetCounterValue(const std::wstring& name, int pid);
+  int GetCounterValue(const std::string& name, int pid);
 
   // The maxinum number of counters/rows in the table.
   int GetMaxCounters() const;
 
   // The maxinum number of threads/columns in the table.
   int GetMaxThreads() const;
 
   // The maximum length (in characters) of a Thread's name including
   // null terminator, as stored in the shared memory.
   static const int kMaxThreadNameLength = 32;
 
   // The maximum length (in characters) of a Counter's name including
   // null terminator, as stored in the shared memory.
   static const int kMaxCounterNameLength = 32;
 
   // Convenience function to lookup a counter location for a
   // counter by name for the calling thread.  Will register
   // the thread if it is not already registered.
-  static int* FindLocation(const wchar_t *name);
+  static int* FindLocation(const char *name);
 
  private:
   // Returns the space occupied by a thread in the table.  Generally used
   // if a thread terminates but the process continues.  This function
   // does not zero out the thread's counters.
   // Cannot be used inside a posix tls destructor.
   void UnregisterThread();
 
   // This variant expects the tls data to be passed in, so it is safe to
   // call from inside a posix tls destructor (see doc for pthread_key_create).
   void UnregisterThread(StatsTableTLSData* tls_data);
 
   // The SlotReturnFunction is called at thread exit for each thread
   // which used the StatsTable.
   static void SlotReturnFunction(void* data);
 
   // Locates a free slot in the table.  Returns a number > 0 on success,
   // or 0 on failure.  The caller must hold the shared_memory lock when
   // calling this function.
   int FindEmptyThread() const;
 
   // Locates a counter in the table or finds an empty row.  Returns a
   // number > 0 on success, or 0 on failure.  The caller must hold the
   // shared_memory_lock when calling this function.
-  int FindCounterOrEmptyRow(const std::wstring& name) const;
+  int FindCounterOrEmptyRow(const std::string& name) const;
 
   // Internal function to add a counter to the StatsTable.  Assumes that
   // the counter does not already exist in the table.
   //
   // name is a unique identifier for this counter, and will be truncated
   // to kMaxCounterNameLength-1 characters.
   //
   // On success, returns the counter_id for the newly added counter.
   // On failure, returns 0.
-  int AddCounter(const std::wstring& name);
+  int AddCounter(const std::string& name);
 
   // Get the TLS data for the calling thread.  Returns NULL if none is
   // initialized.
   StatsTableTLSData* GetTLSData() const;
 
-  typedef base::hash_map<std::wstring, int> CountersMap;
+  typedef base::hash_map<std::string, int> CountersMap;
 
   bool                opened_;
   StatsTablePrivate*  impl_;
   // The counters_lock_ protects the counters_ hash table.
   Lock                counters_lock_;
   // The counters_ hash map is an in-memory hash of the counters.
   // It is used for quick lookup of counters, but is cannot be used
   // as a substitute for what is in the shared memory.  Even though
   // we don't have a counter in our hash table, another process may
   // have created it.
   CountersMap         counters_;
   TLSSlot             tls_index_;
 
   static StatsTable*  global_table_;
   DISALLOW_EVIL_CONSTRUCTORS(StatsTable);
 };
 
 #endif  // BASE_STATS_TABLE_H__