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glibc  2.9
old_pthread_cond_wait.c
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00001 /* Copyright (C) 2002, 2003, 2007 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 #include <errno.h>
00021 #include <stdlib.h>
00022 #include "pthreadP.h"
00023 #include <atomic.h>
00024 #include <shlib-compat.h>
00025 
00026 
00027 #if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_3_2)
00028 int
00029 __pthread_cond_wait_2_0 (cond, mutex)
00030      pthread_cond_2_0_t *cond;
00031      pthread_mutex_t *mutex;
00032 {
00033   if (cond->cond == NULL)
00034     {
00035       pthread_cond_t *newcond;
00036 
00037 #if LLL_LOCK_INITIALIZER == 0
00038       newcond = (pthread_cond_t *) calloc (sizeof (pthread_cond_t), 1);
00039       if (newcond == NULL)
00040        return ENOMEM;
00041 #else
00042       newcond = (pthread_cond_t *) malloc (sizeof (pthread_cond_t));
00043       if (newcond == NULL)
00044        return ENOMEM;
00045 
00046       /* Initialize the condvar.  */
00047       (void) pthread_cond_init (newcond, NULL);
00048 #endif
00049 
00050       if (atomic_compare_and_exchange_bool_acq (&cond->cond, newcond, NULL))
00051        /* Somebody else just initialized the condvar.  */
00052        free (newcond);
00053     }
00054 
00055   return __pthread_cond_wait (cond->cond, mutex);
00056 }
00057 compat_symbol (libpthread, __pthread_cond_wait_2_0, pthread_cond_wait,
00058               GLIBC_2_0);
00059 #endif