mirror of
https://github.com/ntop/ntopng.git
synced 2026-05-22 19:21:13 +00:00
137 lines
3.6 KiB
C++
137 lines
3.6 KiB
C++
/*
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*
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* (C) 2013-19 - ntop.org
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*
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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 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#include "ntop_includes.h"
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//#define DEBUG_RW_LOCK
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/* ******************************* */
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RwLock::RwLock() {
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#ifndef HAVE_RW_LOCK
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Mutex m;
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#else
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pthread_rwlock_init(&the_rwlock, NULL);
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#endif
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}
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/* ******************************* */
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RwLock::~RwLock() {
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#ifndef HAVE_RW_LOCK
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/* Mutex destructor called automatically */
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#else
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pthread_rwlock_destroy(&the_rwlock);
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#endif
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}
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/* ******************************* */
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void RwLock::lock(const char *filename, int line, bool readonly) {
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#ifndef HAVE_RW_LOCK
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#ifdef DEBUG_RW_LOCK
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ntop->getTrace()->traceEvent(TRACE_NORMAL, "[%s:%d] lock(%p)", filename, line, &m);
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#endif
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m.lock(filename, line);
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#else
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int rc;
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if(readonly) {
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#ifdef DEBUG_RW_LOCK
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ntop->getTrace()->traceEvent(TRACE_NORMAL, "[%s:%d] lock(RO, %p)", filename, line, &the_rwlock);
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#endif
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rc = pthread_rwlock_rdlock(&the_rwlock);
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} else {
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#ifdef DEBUG_RW_LOCK
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ntop->getTrace()->traceEvent(TRACE_NORMAL, "[%s:%d] lock(RW, %p)", filename, line, &the_rwlock);
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#endif
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rc = pthread_rwlock_wrlock(&the_rwlock);
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}
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if(rc)
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ntop->getTrace()->traceEvent(TRACE_WARNING, "Unable to acquire lock. Return code %d [%s]", rc, strerror(rc), errno);
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#endif
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}
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/* ******************************* */
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bool RwLock::trylock(const char *filename, int line, bool readonly) {
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#ifndef HAVE_RW_LOCK
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m.lock(filename, line);
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return true; /* Pretend to be always successful - indeed, if here the lock is acquired even in a blocking fashion */
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#else
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int rc;
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if(readonly)
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rc = pthread_rwlock_tryrdlock(&the_rwlock);
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else
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rc = pthread_rwlock_trywrlock(&the_rwlock);
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if(!rc)
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return true; /* Lock acquired successfully */
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if(rc == EBUSY)
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; /* Normal, lock is being held by someone else */
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else
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ntop->getTrace()->traceEvent(TRACE_NORMAL, "Unable to acquire lock. Return code %d [%s]", rc, strerror(rc));
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return false; /* Lock not acquired, held by someone else or there was an error */
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#endif
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}
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/* ******************************* */
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void RwLock::rdlock(const char *filename, int line) {
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lock(filename, line, true /* readonly */);
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}
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/* ******************************* */
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void RwLock::wrlock(const char *filename, int line) {
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lock(filename, line, false /* write */);
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}
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/* ******************************* */
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bool RwLock::trywrlock(const char *filename, int line) {
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return trylock(filename, line, false /* write */);
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}
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/* ******************************* */
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void RwLock::unlock(const char *filename, int line) {
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#ifndef HAVE_RW_LOCK
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#ifdef DEBUG_RW_LOCK
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ntop->getTrace()->traceEvent(TRACE_NORMAL, "[%s:%d] unlock(%p)", filename, line, &m);
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#endif
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m.unlock(filename, line);
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#else
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int rc;
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#ifdef DEBUG_RW_LOCK
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ntop->getTrace()->traceEvent(TRACE_NORMAL, "[%s:%d] unlock(%p)", filename, line, &the_rwlock);
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#endif
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rc = pthread_rwlock_unlock(&the_rwlock);
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if(rc)
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ntop->getTrace()->traceEvent(TRACE_WARNING, "pthread_rwlock_unlock() returned %d [%s]", rc, strerror(rc), errno);
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#endif
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}
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