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Lock.cpp
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00001 /*
00002  * This program is free software; you can redistribute it and/or modify
00003  * it under the terms of the GNU General Public License as published by
00004  * the Free Software Foundation; either version 3 of the License, or
00005  * (at your option) any later version.
00006  *
00007  * Copyright (C) 2013 Soeren Sonnenburg
00008  */
00009 #include <shogun/lib/config.h>
00010 #include <shogun/lib/memory.h>
00011 #include <shogun/lib/Lock.h>
00012 
00013 #ifdef HAVE_PTHREAD
00014 #include <pthread.h>
00015 #ifdef USE_SPINLOCKS
00016 #ifdef DARWIN
00017 #include <libkern/OSAtomic.h>
00018     #define PTHREAD_LOCK_T OSSpinLock
00019     #define PTHREAD_LOCK_INIT(lock) *lock = OS_SPINLOCK_INIT
00020     #define PTHREAD_LOCK_DESTROY(lock)
00021     #define PTHREAD_LOCK(lock) OSSpinLockLock(lock)
00022     #define PTHREAD_UNLOCK(lock) OSSpinLockUnlock(lock)
00023 #else
00024     #define PTHREAD_LOCK_T pthread_spinlock_t
00025     #define PTHREAD_LOCK_INIT(lock) pthread_spin_init(lock, 0)
00026     #define PTHREAD_LOCK_DESTROY(lock) pthread_spin_destroy(lock)
00027     #define PTHREAD_LOCK(lock) pthread_spin_lock(lock)
00028     #define PTHREAD_UNLOCK(lock) pthread_spin_unlock(lock)
00029 #endif
00030 #else
00031     #define PTHREAD_LOCK_T pthread_mutex_t
00032     #define PTHREAD_LOCK_INIT(lock) pthread_mutex_init(lock, NULL)
00033     #define PTHREAD_LOCK_DESTROY(lock) pthread_mutex_destroy(lock)
00034     #define PTHREAD_LOCK(lock) pthread_mutex_lock(lock)
00035     #define PTHREAD_UNLOCK(lock) pthread_mutex_unlock(lock)
00036 #endif
00037 #endif
00038 
00039 using namespace shogun;
00040 
00041 CLock::CLock()
00042 {
00043 #ifdef HAVE_PTHREAD
00044     lock_object=(void*) SG_MALLOC(PTHREAD_LOCK_T, 1);
00045     PTHREAD_LOCK_INIT((PTHREAD_LOCK_T*) lock_object);
00046 #endif
00047 }
00048 
00049 CLock::~CLock()
00050 {
00051 #ifdef HAVE_PTHREAD
00052     PTHREAD_LOCK_DESTROY((PTHREAD_LOCK_T*) lock_object);
00053     SG_FREE(lock_object);
00054 #endif
00055 }
00056 
00057 void CLock::lock()
00058 {
00059 #ifdef HAVE_PTHREAD
00060     PTHREAD_LOCK((PTHREAD_LOCK_T*) lock_object);
00061 #endif
00062 }
00063 
00064 void CLock::unlock()
00065 {
00066 #ifdef HAVE_PTHREAD
00067     PTHREAD_UNLOCK((PTHREAD_LOCK_T*) lock_object);
00068 #endif
00069 }
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