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glibc  2.9
old_pthread_cond_timedwait.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_timedwait_2_0 (cond, mutex, abstime)
00030      pthread_cond_2_0_t *cond;
00031      pthread_mutex_t *mutex;
00032      const struct timespec *abstime;
00033 {
00034   if (cond->cond == NULL)
00035     {
00036       pthread_cond_t *newcond;
00037 
00038 #if LLL_LOCK_INITIALIZER == 0
00039       newcond = (pthread_cond_t *) calloc (sizeof (pthread_cond_t), 1);
00040       if (newcond == NULL)
00041        return ENOMEM;
00042 #else
00043       newcond = (pthread_cond_t *) malloc (sizeof (pthread_cond_t));
00044       if (newcond == NULL)
00045        return ENOMEM;
00046 
00047       /* Initialize the condvar.  */
00048       (void) pthread_cond_init (newcond, NULL);
00049 #endif
00050 
00051       if (atomic_compare_and_exchange_bool_acq (&cond->cond, newcond, NULL))
00052        /* Somebody else just initialized the condvar.  */
00053        free (newcond);
00054     }
00055 
00056   return __pthread_cond_timedwait (cond->cond, mutex, abstime);
00057 }
00058 compat_symbol (libpthread, __pthread_cond_timedwait_2_0,
00059               pthread_cond_timedwait, GLIBC_2_0);
00060 #endif