barrier.h

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00001 /* Ergo, version 3.2, a program for linear scaling electronic structure
00002  * calculations.
00003  * Copyright (C) 2012 Elias Rudberg, Emanuel H. Rubensson, and Pawel Salek.
00004  * 
00005  * This program is free software: you can redistribute it and/or modify
00006  * it under the terms of the GNU General Public License as published by
00007  * the Free Software Foundation, either version 3 of the License, or
00008  * (at your option) any later version.
00009  * 
00010  * This program 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
00013  * GNU General Public License for more details.
00014  * 
00015  * You should have received a copy of the GNU General Public License
00016  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
00017  * 
00018  * Primary academic reference:
00019  * Kohn−Sham Density Functional Theory Electronic Structure Calculations 
00020  * with Linearly Scaling Computational Time and Memory Usage,
00021  * Elias Rudberg, Emanuel H. Rubensson, and Pawel Salek,
00022  * J. Chem. Theory Comput. 7, 340 (2011),
00023  * <http://dx.doi.org/10.1021/ct100611z>
00024  * 
00025  * For further information about Ergo, see <http://www.ergoscf.org>.
00026  */
00027 
00028 #if !defined(_ERGO_BARRIER_H_)
00029 #define _ERGO_BARRIER_H_
00030 
00034 #if !defined(HAS_PTHREAD_BARRIER)
00035 
00036 #ifdef __cplusplus
00037 #define EXTERN_C extern "C"
00038 #else
00039 #define EXTERN_C extern
00040 #endif
00041 
00042 #if !defined(PTHREAD_BARRIER_SERIAL_THREAD)
00043 #define PTHREAD_BARRIER_SERIAL_THREAD -1
00044 #endif
00045 
00046 typedef struct ergo_barrier {
00047   pthread_mutex_t barrierMutex;
00048   pthread_cond_t  conditionVar;
00049   int initCount;
00050   int currCount;
00051   int cycle;
00052 } ergo_barrier_t;
00053 
00054 EXTERN_C int ergo_barrier_init(ergo_barrier_t *__restrict barrier,
00055                                const void * attr_ignored,
00056                                unsigned int count);
00057 
00058 EXTERN_C int ergo_barrier_destroy (ergo_barrier_t *__barrier);
00059 EXTERN_C int ergo_barrier_wait (ergo_barrier_t *__barrier);
00060 
00061 #else /* HAS_PTHREAD_BARRIER */
00062 #define ergo_barrier_t       pthread_barrier_t
00063 #define ergo_barrier_init    pthread_barrier_init
00064 #define ergo_barrier_destroy pthread_barrier_destroy
00065 #define ergo_barrier_wait    pthread_barrier_wait
00066 #endif /* HAS_PTHREAD_BARRIER */
00067 
00068 #endif /* _ERGO_BARRIER_H_ */

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