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glibc  2.9
rtld-lowlevel.h
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00001 /* Defintions for lowlevel handling in ld.so.
00002    Copyright (C) 2006, 2007 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #ifndef _RTLD_LOWLEVEL_H
00021 #define  _RTLD_LOWLEVEL_H 1
00022 
00023 #include <atomic.h>
00024 #include <lowlevellock.h>
00025 
00026 
00027 /* Function to wait for variable become zero.  Used in ld.so for
00028    reference counters.  */
00029 #define __rtld_waitzero(word) \
00030   do {                                                               \
00031     while (1)                                                        \
00032       {                                                                     \
00033        int val = word;                                                      \
00034        if (val == 0)                                                 \
00035          break;                                                      \
00036        lll_futex_wait (&(word), val, LLL_PRIVATE);                          \
00037       }                                                                     \
00038   } while (0)
00039 
00040 
00041 #define __rtld_notify(word) \
00042   lll_futex_wake (&(word), 1, LLL_PRIVATE)
00043 
00044 #endif