Zabbix

/*

** Copyright (C) 2001-2025 Zabbix SIA

**

** This program is free software: you can redistribute it and/or modify it under the terms of

** the GNU Affero General Public License as published by the Free Software Foundation, version 3.

**

** 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 Affero General Public License for more details.

**

** You should have received a copy of the GNU Affero General Public License along with this program.

** If not, see <https://www.gnu.org/licenses/>.

**/

​

#include "zbxtimekeeper.h"

#include "zbxcommon.h"

#include "zbxalgo.h"

#include "zbxtimekeeper.h"

​

#define MAX_HISTORY 60

​

#define ZBX_TIMEKEEPER_FLUSH_DELAY      (ZBX_TIMEKEEPER_DELAY * 0.5)

​

/* unit state cache, updated only by the execution units themselves */

typedef struct

{

    /* the current usage statistics */

    zbx_uint64_t    counter[ZBX_PROCESS_STATE_COUNT];

​

    /* ticks of the last timekeeper update */

    clock_t     ticks;

​

    /* ticks of the last timekeeper cache flush */

    clock_t     ticks_flush;

​

    /* the current process state (see ZBX_PROCESS_STATE_* defines) */

    unsigned char   state;

}

zbx_timekeeper_unit_cache_t;

​

/* execution unit state statistics */

typedef struct

{

    /* historical unit state data */

    zbx_uint64_t        h_counter[ZBX_PROCESS_STATE_COUNT][MAX_HISTORY];

​

    /* unit state data for the current data gathering cycle */

    zbx_uint64_t        counter[ZBX_PROCESS_STATE_COUNT];

​

    /* the unit state that was already applied to the historical state data */

    zbx_uint64_t        counter_used[ZBX_PROCESS_STATE_COUNT];

​

    /* the unit state cache */

    zbx_timekeeper_unit_cache_t cache;

}

zbx_timekeeper_unit_t;

​

typedef enum

{

    TIMEKEEPER_SYNC_INTERNAL,

    TIMEKEEPER_SYNC_EXTERNAL

}

zbx_timekeeper_sync_source_t;

​

struct zbx_timekeeper

{

    zbx_timekeeper_unit_t   *units;

    int         units_num;

    int         first;

    int         count;

​

    /* number of ticks per second */

    long int        ticks_per_sec;

​

    /* ticks of the last timekeeper sync (data gathering) */

    clock_t         ticks_sync;

​

    zbx_timekeeper_sync_t       *sync;

    zbx_timekeeper_sync_source_t    sync_source;

​

    zbx_mem_malloc_func_t   mem_malloc_func;

    zbx_mem_realloc_func_t  mem_realloc_func;

    zbx_mem_free_func_t mem_free_func;

};

​

static clock_t  zbx_times(void)

{

#if !defined(TIMES_NULL_ARG)

    struct tms  buf;

​

    return times(&buf);