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locks.c
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/*
ex: set tabstop=4 shiftwidth=4 autoindent:
+-------------------------------------------------------------------------+
| Copyright (C) 2002-2015 The Cacti Group |
| |
| This program is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with this library; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301, USA |
| |
+-------------------------------------------------------------------------+
| spine: a backend data gatherer for cacti |
+-------------------------------------------------------------------------+
| This poller would not have been possible without: |
| - Larry Adams (current development and enhancements) |
| - Rivo Nurges (rrd support, mysql poller cache, misc functions) |
| - RTG (core poller code, pthreads, snmp, autoconf examples) |
| - Brady Alleman/Doug Warner (threading ideas, implimentation details) |
+-------------------------------------------------------------------------+
| - Cacti - http://www.cacti.net/ |
+-------------------------------------------------------------------------+
*/
#include "common.h"
#include "spine.h"
/*
* each lock requires a handful of parts: a mutex, an init structure, and an
* init helper function. We are NOT allowed to use these in an array (doesn
* not work with pthreads), so we are stuck setting these up individually.
* This macro defines these helpers in a single step.
*/
#define DEFINE_SPINE_LOCK(name) \
static pthread_mutex_t name ## _lock; \
static pthread_once_t name ## _lock_o = PTHREAD_ONCE_INIT; \
static void init_ ## name ## _lock(void) { \
pthread_mutex_init(&name ## _lock, PTHREAD_MUTEXATTR_DEFAULT); \
}
DEFINE_SPINE_LOCK(snmp)
DEFINE_SPINE_LOCK(thread)
DEFINE_SPINE_LOCK(seteuid)
DEFINE_SPINE_LOCK(ghbn)
DEFINE_SPINE_LOCK(pipe)
DEFINE_SPINE_LOCK(syslog)
DEFINE_SPINE_LOCK(php)
DEFINE_SPINE_LOCK(php_proc_0)
DEFINE_SPINE_LOCK(php_proc_1)
DEFINE_SPINE_LOCK(php_proc_2)
DEFINE_SPINE_LOCK(php_proc_3)
DEFINE_SPINE_LOCK(php_proc_4)
DEFINE_SPINE_LOCK(php_proc_5)
DEFINE_SPINE_LOCK(php_proc_6)
DEFINE_SPINE_LOCK(php_proc_7)
DEFINE_SPINE_LOCK(php_proc_8)
DEFINE_SPINE_LOCK(php_proc_9)
void init_mutexes() {
pthread_once((pthread_once_t*) get_attr(LOCK_SNMP_O), init_snmp_lock);
pthread_once((pthread_once_t*) get_attr(LOCK_THREAD_O), init_thread_lock);
pthread_once((pthread_once_t*) get_attr(LOCK_SETEUID_O), init_seteuid_lock);
pthread_once((pthread_once_t*) get_attr(LOCK_GHBN_O), init_ghbn_lock);
pthread_once((pthread_once_t*) get_attr(LOCK_PIPE_O), init_pipe_lock);
pthread_once((pthread_once_t*) get_attr(LOCK_SYSLOG_O), init_syslog_lock);
pthread_once((pthread_once_t*) get_attr(LOCK_PHP_O), init_php_lock);
pthread_once((pthread_once_t*) get_attr(LOCK_PHP_PROC_0_O), init_php_proc_0_lock);
pthread_once((pthread_once_t*) get_attr(LOCK_PHP_PROC_1_O), init_php_proc_1_lock);
pthread_once((pthread_once_t*) get_attr(LOCK_PHP_PROC_2_O), init_php_proc_2_lock);
pthread_once((pthread_once_t*) get_attr(LOCK_PHP_PROC_3_O), init_php_proc_3_lock);
pthread_once((pthread_once_t*) get_attr(LOCK_PHP_PROC_4_O), init_php_proc_4_lock);
pthread_once((pthread_once_t*) get_attr(LOCK_PHP_PROC_5_O), init_php_proc_5_lock);
pthread_once((pthread_once_t*) get_attr(LOCK_PHP_PROC_6_O), init_php_proc_6_lock);
pthread_once((pthread_once_t*) get_attr(LOCK_PHP_PROC_7_O), init_php_proc_7_lock);
pthread_once((pthread_once_t*) get_attr(LOCK_PHP_PROC_8_O), init_php_proc_8_lock);
pthread_once((pthread_once_t*) get_attr(LOCK_PHP_PROC_9_O), init_php_proc_9_lock);
}
pthread_mutex_t* get_lock(int lock) {
pthread_mutex_t *ret_val = NULL;
switch (lock) {
case LOCK_SNMP: ret_val = &snmp_lock; break;
case LOCK_THREAD: ret_val = &thread_lock; break;
case LOCK_SETEUID: ret_val = &seteuid_lock; break;
case LOCK_GHBN: ret_val = &ghbn_lock; break;
case LOCK_PIPE: ret_val = &pipe_lock; break;
case LOCK_SYSLOG: ret_val = &syslog_lock; break;
case LOCK_PHP: ret_val = &php_lock; break;
case LOCK_PHP_PROC_0: ret_val = &php_proc_0_lock; break;
case LOCK_PHP_PROC_1: ret_val = &php_proc_1_lock; break;
case LOCK_PHP_PROC_2: ret_val = &php_proc_2_lock; break;
case LOCK_PHP_PROC_3: ret_val = &php_proc_3_lock; break;
case LOCK_PHP_PROC_4: ret_val = &php_proc_4_lock; break;
case LOCK_PHP_PROC_5: ret_val = &php_proc_5_lock; break;
case LOCK_PHP_PROC_6: ret_val = &php_proc_6_lock; break;
case LOCK_PHP_PROC_7: ret_val = &php_proc_7_lock; break;
case LOCK_PHP_PROC_8: ret_val = &php_proc_8_lock; break;
case LOCK_PHP_PROC_9: ret_val = &php_proc_9_lock; break;
}
return ret_val;
}
pthread_once_t* get_attr(int locko) {
pthread_once_t *ret_val = NULL;
switch (locko) {
case LOCK_SNMP_O: ret_val = &snmp_lock_o; break;
case LOCK_THREAD_O: ret_val = &thread_lock_o; break;
case LOCK_SETEUID_O: ret_val = &seteuid_lock_o; break;
case LOCK_GHBN_O: ret_val = &ghbn_lock_o; break;
case LOCK_PIPE_O: ret_val = &pipe_lock_o; break;
case LOCK_SYSLOG_O: ret_val = &syslog_lock_o; break;
case LOCK_PHP_O: ret_val = &php_lock_o; break;
case LOCK_PHP_PROC_0_O: ret_val = &php_proc_0_lock_o; break;
case LOCK_PHP_PROC_1_O: ret_val = &php_proc_1_lock_o; break;
case LOCK_PHP_PROC_2_O: ret_val = &php_proc_2_lock_o; break;
case LOCK_PHP_PROC_3_O: ret_val = &php_proc_3_lock_o; break;
case LOCK_PHP_PROC_4_O: ret_val = &php_proc_4_lock_o; break;
case LOCK_PHP_PROC_5_O: ret_val = &php_proc_5_lock_o; break;
case LOCK_PHP_PROC_6_O: ret_val = &php_proc_6_lock_o; break;
case LOCK_PHP_PROC_7_O: ret_val = &php_proc_7_lock_o; break;
case LOCK_PHP_PROC_8_O: ret_val = &php_proc_8_lock_o; break;
case LOCK_PHP_PROC_9_O: ret_val = &php_proc_9_lock_o; break;
}
return ret_val;
}
void thread_mutex_lock(int mutex) {
pthread_mutex_lock(get_lock(mutex));
}
void thread_mutex_unlock(int mutex) {
pthread_mutex_unlock(get_lock(mutex));
}
int thread_mutex_trylock(int mutex) {
return pthread_mutex_trylock(get_lock(mutex));
}