2004-10-06  Benjamin Kosnik  <bkoz@redhat.com>
	    Paolo Carlini  <pcarlini@suse.de>

	PR libstdc++/17780
	* src/mt_allocator.cc (__pool<true>::_M_reserve_block): Revert
	locking changes.

Index: src/mt_allocator.cc
===================================================================
RCS file: /cvs/gcc/gcc/libstdc++-v3/src/mt_allocator.cc,v
retrieving revision 1.2
diff -c -p -r1.2 mt_allocator.cc
*** src/mt_allocator.cc	6 Oct 2004 04:22:41 -0000	1.2
--- src/mt_allocator.cc	6 Oct 2004 15:53:44 -0000
*************** namespace __gnu_cxx
*** 298,307 ****
--- 298,310 ----
      _Block_record* __block = NULL;
      if (__gthread_active_p())
        {
+ 	__gthread_mutex_lock(__bin._M_mutex);
  	if (__bin._M_first[0] == NULL)
  	  {
  	    // No need to hold the lock when we are adding a whole
  	    // chunk to our own list.
+ 	    __gthread_mutex_unlock(__bin._M_mutex);
+ 
  	    void* __v = ::operator new(__options._M_chunk_size);
  	    __bin._M_first[__thread_id] = static_cast<_Block_record*>(__v);
  	    __bin._M_free[__thread_id] = __block_count;
*************** namespace __gnu_cxx
*** 327,333 ****
  	    // Is the number of required blocks greater than or equal
  	    // to the number that can be provided by the global free
  	    // list?
- 	    __gthread_mutex_lock(__bin._M_mutex);
  	    __bin._M_first[__thread_id] = __bin._M_first[0];
  	    if (__block_count >= __bin._M_free[0])
  	      {
--- 330,335 ----