00001 /******************************************************************************* 00002 * Copyright (C) 2004 Vintela, Inc. All rights reserved. 00003 * Copyright (C) 2005 Novell, Inc. All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without 00006 * modification, are permitted provided that the following conditions are met: 00007 * 00008 * - Redistributions of source code must retain the above copyright notice, 00009 * this list of conditions and the following disclaimer. 00010 * 00011 * - Redistributions in binary form must reproduce the above copyright notice, 00012 * this list of conditions and the following disclaimer in the documentation 00013 * and/or other materials provided with the distribution. 00014 * 00015 * - Neither the name of Vintela, Inc., Novell, Inc., nor the names of its 00016 * contributors may be used to endorse or promote products derived from this 00017 * software without specific prior written permission. 00018 * 00019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' 00020 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00021 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00022 * ARE DISCLAIMED. IN NO EVENT SHALL Vintela, Inc., Novell, Inc., OR THE 00023 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00024 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 00025 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 00026 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 00027 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 00028 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 00029 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00030 *******************************************************************************/ 00031 00032 00037 #include "blocxx/BLOCXX_config.h" 00038 #include "blocxx/AtomicOps.hpp" 00039 00040 #if defined(BLOCXX_USE_PTHREAD_SPIN_LOCK_ATOMIC_OPS) 00041 00042 namespace BLOCXX_NAMESPACE 00043 { 00044 00045 Atomic_t::Atomic_t() 00046 : val(0) 00047 { 00048 pthread_spin_init(&spinlock, 0); 00049 } 00050 Atomic_t::Atomic_t(int i) 00051 : val(i) 00052 { 00053 pthread_spin_init(&spinlock, 0); 00054 } 00055 void AtomicInc(Atomic_t &v) 00056 { 00057 pthread_spin_lock(&v.spinlock); 00058 ++v.val; 00059 pthread_spin_unlock(&v.spinlock); 00060 } 00061 bool AtomicDecAndTest(Atomic_t &v) 00062 { 00063 pthread_spin_lock(&v.spinlock); 00064 --v.val; 00065 bool b = ((v.val == 0) ? true : false) ; 00066 pthread_spin_unlock(&v.spinlock); 00067 return b; 00068 } 00069 int AtomicGet(Atomic_t const &v) 00070 { 00071 return v.val; 00072 } 00073 void AtomicDec(Atomic_t &v) 00074 { 00075 pthread_spin_lock(&v.spinlock); 00076 --v.val; 00077 pthread_spin_unlock(&v.spinlock); 00078 } 00079 00080 } // end namespace BLOCXX_NAMESPACE 00081 00082 #elif defined(BLOCXX_USE_BLOCXX_DEFAULT_ATOMIC_OPS) 00083 #include "blocxx/Mutex.hpp" 00084 #include "blocxx/MutexLock.hpp" 00085 #include "blocxx/ThreadOnce.hpp" 00086 00087 namespace BLOCXX_NAMESPACE 00088 { 00089 00090 // this needs to be a pointer because of static initialization order conflicts. 00091 // It shouldn't ever be deleted b/c it may be referenced by a destructor of a 00092 // static variable that is being deleted. 00093 static Mutex* guard = 0; 00094 static OnceFlag g_once = BLOCXX_ONCE_INIT; 00095 static void initGuard() 00096 { 00097 guard = new Mutex(); 00098 } 00099 void AtomicInc(Atomic_t &v) 00100 { 00101 callOnce(g_once, initGuard); 00102 MutexLock lock(*guard); 00103 ++v.val; 00104 } 00105 bool AtomicDecAndTest(Atomic_t &v) 00106 { 00107 callOnce(g_once, initGuard); 00108 MutexLock lock(*guard); 00109 return --v.val == 0; 00110 } 00111 int AtomicGet(Atomic_t const &v) 00112 { 00113 callOnce(g_once, initGuard); 00114 MutexLock lock(*guard); 00115 return v.val; 00116 } 00117 void AtomicDec(Atomic_t &v) 00118 { 00119 callOnce(g_once, initGuard); 00120 MutexLock lock(*guard); 00121 --v.val; 00122 } 00123 00124 } // end namespace BLOCXX_NAMESPACE 00125 00126 #endif 00127 00128