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1548.4.113
by Zimin
remove table lock, add FilesystemLock to this storage engine |
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/*
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Copyright (C) 2010 Zimin
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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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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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
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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1800.3.1
by Vijay Samuel
Merge change of <config.h> to "config.h" |
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#include "config.h" |
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1548.4.113
by Zimin
remove table lock, add FilesystemLock to this storage engine |
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#include <pthread.h> |
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#include <assert.h> |
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#include "filesystemlock.h" |
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FilesystemLock::FilesystemLock() |
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: scanner_count(0), |
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updater_count(0) |
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{
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pthread_cond_init(&condition, NULL); |
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pthread_mutex_init(&mutex, NULL); |
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}
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FilesystemLock::~FilesystemLock() |
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{
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pthread_cond_destroy(&condition); |
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pthread_mutex_destroy(&mutex); |
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}
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void FilesystemLock::scan_begin() |
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{
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pthread_mutex_lock(&mutex); |
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while (true) |
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{
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if (updater_count == 0) |
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{
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scanner_count++; |
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pthread_mutex_unlock(&mutex); |
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return; |
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}
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pthread_cond_wait(&condition, &mutex); |
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}
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}
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void FilesystemLock::scan_end() { |
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pthread_mutex_lock(&mutex); |
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scanner_count--; |
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assert(scanner_count >= 0); |
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if (scanner_count == 0) |
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pthread_cond_broadcast(&condition); |
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pthread_mutex_unlock(&mutex); |
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}
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void FilesystemLock::scan_update_begin() |
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{
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pthread_mutex_lock(&mutex); |
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while (true) |
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{
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if (scanner_count == 0 && updater_count == 0) |
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{
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scanner_count++; |
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updater_count++; |
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pthread_mutex_unlock(&mutex); |
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return; |
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}
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pthread_cond_wait(&condition, &mutex); |
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}
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}
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void FilesystemLock::scan_update_end() |
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{
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pthread_mutex_lock(&mutex); |
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scanner_count--; |
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updater_count--; |
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assert(scanner_count >= 0 && updater_count >= 0); |
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pthread_cond_broadcast(&condition); |
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pthread_mutex_unlock(&mutex); |
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}
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