mirror of
https://github.com/uroni/urbackup_backend.git
synced 2025-10-26 11:36:50 +00:00
147 lines
3.7 KiB
C++
147 lines
3.7 KiB
C++
/*************************************************************************
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* UrBackup - Client/Server backup system
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* Copyright (C) 2011-2016 Martin Raiber
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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**************************************************************************/
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#include "SharedMutex_lin.h"
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#include "Server.h"
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#include "stringtools.h"
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#include <assert.h>
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SharedMutex::SharedMutex()
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{
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pthread_rwlockattr_t attr;
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int rc;
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if((rc=pthread_rwlockattr_init(&attr))!=0)
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{
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Server->Log("Error initializing rwlockattr rc="+convert(rc), LL_ERROR);
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assert(false);
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}
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#ifdef __GLIBC__
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if((rc=pthread_rwlockattr_setkind_np(&attr, PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP))!=0)
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{
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Server->Log("Error setting PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP rc="+convert(rc), LL_ERROR);
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assert(false);
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}
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#endif
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rc = pthread_rwlock_init(&lock, &attr);
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if(rc)
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{
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Server->Log("Error initializing rwlock rc="+convert(rc), LL_ERROR);
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assert(false);
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}
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if((rc=pthread_rwlockattr_destroy(&attr))!=0)
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{
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Server->Log("Error destroing rwlockattr rc="+convert(rc), LL_ERROR);
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assert(false);
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}
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#ifdef SHARED_MUTEX_CHECK
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check_mutex.reset(Server->createMutex());
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#endif
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}
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SharedMutex::~SharedMutex()
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{
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int rc = pthread_rwlock_destroy(&lock);
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if(rc)
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{
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Server->Log("Error destroying rwlock rc="+convert(rc), LL_ERROR);
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assert(false);
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}
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}
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ILock* SharedMutex::readLock()
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{
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#ifdef SHARED_MUTEX_CHECK
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{
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IScopedLock lock(check_mutex.get());
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std::pair<std::set<pthread_t>::iterator, bool> ins = check_threads.insert(pthread_self());
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assert(ins.second);
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}
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#endif
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return new ReadLock(&lock
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SHARED_MUTEX_CHECK_P(this));
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}
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ILock* SharedMutex::writeLock()
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{
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#ifdef SHARED_MUTEX_CHECK
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{
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IScopedLock lock(check_mutex.get());
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assert(check_threads.find(pthread_self())
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== check_threads.end());
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}
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#endif
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return new WriteLock(&lock);
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}
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#ifdef SHARED_MUTEX_CHECK
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void SharedMutex::rmLockCheck()
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{
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IScopedLock lock(check_mutex.get());
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assert(check_threads.erase(pthread_self()) == 1);
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}
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#endif
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ReadLock::ReadLock( pthread_rwlock_t* read_lock
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SHARED_MUTEX_CHECK_P(SharedMutex* shared_mutex))
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: read_lock(read_lock)
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SHARED_MUTEX_CHECK_P(shared_mutex(shared_mutex))
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{
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int rc = pthread_rwlock_rdlock(read_lock);
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if(rc)
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{
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Server->Log("Error locking rwlock_rdlock rc="+convert(rc), LL_ERROR);
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assert(false);
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}
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}
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ReadLock::~ReadLock()
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{
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int rc = pthread_rwlock_unlock(read_lock);
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if(rc)
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{
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Server->Log("Error unlocking rwlock rc="+convert(rc), LL_ERROR);
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assert(false);
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}
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#ifdef SHARED_MUTEX_CHECK
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shared_mutex->rmLockCheck();
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#endif
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}
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WriteLock::WriteLock( pthread_rwlock_t* write_lock )
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: write_lock(write_lock)
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{
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int rc = pthread_rwlock_wrlock(write_lock);
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if(rc)
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{
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Server->Log("Error locking rwlock_wrlock rc="+convert(rc), LL_ERROR);
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assert(false);
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}
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}
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WriteLock::~WriteLock()
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{
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int rc = pthread_rwlock_unlock(write_lock);
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if(rc)
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{
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Server->Log("Error unlocking rwlock rc="+convert(rc), LL_ERROR);
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assert(false);
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}
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}
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