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glibc  2.9
old_pthread_cond_signal.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_signal_2_0 (cond)
00030      pthread_cond_2_0_t *cond;
00031 {
00032   if (cond->cond == NULL)
00033     {
00034       pthread_cond_t *newcond;
00035 
00036 #if LLL_LOCK_INITIALIZER == 0
00037       newcond = (pthread_cond_t *) calloc (sizeof (pthread_cond_t), 1);
00038       if (newcond == NULL)
00039        return ENOMEM;
00040 #else
00041       newcond = (pthread_cond_t *) malloc (sizeof (pthread_cond_t));
00042       if (newcond == NULL)
00043        return ENOMEM;
00044 
00045       /* Initialize the condvar.  */
00046       (void) pthread_cond_init (newcond, NULL);
00047 #endif
00048 
00049       if (atomic_compare_and_exchange_bool_acq (&cond->cond, newcond, NULL))
00050        /* Somebody else just initialized the condvar.  */
00051        free (newcond);
00052     }
00053 
00054   return __pthread_cond_signal (cond->cond);
00055 }
00056 compat_symbol (libpthread, __pthread_cond_signal_2_0, pthread_cond_signal,
00057               GLIBC_2_0);
00058 #endif