cache_maintenance.cc File Reference

Cache maintenance implementation More...

#include "cache_maintenance.h"
#include "ffmpegfs.h"
#include "logging.h"
#include <csignal>
#include <unistd.h>
#include <sys/shm.h>
#include <semaphore.h>

Include dependency graph for cache_maintenance.cc:

Go to the source code of this file.

Macros
#define	CLOCKID   CLOCK_REALTIME
	Use real time clock here. More...
#define	SIGMAINT   SIGRTMIN
	Map maintenance signal. More...
#define	SEM_OPEN_FILE   "/" PACKAGE_NAME "_04806785-b5fb-4615-ba56-b30a2946e80b"
	Shared semaphore name, should be unique system wide. More...

Functions
static void	maintenance_handler (int sig, __attribute__((unused)) siginfo_t *si, __attribute__((unused)) void *uc)
	Run maintenance handler. More...
static bool	start_timer (time_t interval)
	Start the maintenance timer at predefined interval. More...
static bool	stop_timer ()
	Stop the maintenance timer. More...
static bool	link_up ()
	Set system wide inter process link up. More...
static void	master_check ()
	Check if a master is already running. We become master if not. More...
static bool	link_down ()
	Set system wide inter process link down. More...
bool	start_cache_maintenance (time_t interval)
	Start cache maintenance timer. More...
bool	stop_cache_maintenance ()
	Stop cache maintenance timer. More...

Variables
static sigset_t	mask
	Process mask for timer. More...
static timer_t	timerid
	Timer id. More...
static sem_t *	sem
	Semaphore used to synchronise between master and slave processes. More...
static int	shmid
	Shared memory segment ID. More...
static pid_t *	pid_master
	PID of master process. More...
static bool	master
	If true, we are master. More...

Detailed Description

Cache maintenance implementation

Author

Norbert Schlia (nschl.nosp@m.ia@o.nosp@m.blivi.nosp@m.on-s.nosp@m.oftwa.nosp@m.re.d.nosp@m.e)

Copyright

Copyright (C) 2017-2024 Norbert Schlia (nschl.nosp@m.ia@o.nosp@m.blivi.nosp@m.on-s.nosp@m.oftwa.nosp@m.re.d.nosp@m.e)

Definition in file cache_maintenance.cc.

Macro Definition Documentation

CLOCKID

#define CLOCKID   CLOCK_REALTIME

Use real time clock here.

Definition at line 41 of file cache_maintenance.cc.

SEM_OPEN_FILE

#define SEM_OPEN_FILE   "/" PACKAGE_NAME "_04806785-b5fb-4615-ba56-b30a2946e80b"

Shared semaphore name, should be unique system wide.

Definition at line 44 of file cache_maintenance.cc.

SIGMAINT

#define SIGMAINT   SIGRTMIN

Map maintenance signal.

Definition at line 42 of file cache_maintenance.cc.

Function Documentation

link_down()

static bool link_down ( )

static

Set system wide inter process link down.

Returns

On success, returns true. On error, returns false. Check errno for details.

Definition at line 271 of file cache_maintenance.cc.

References Logging::error(), Logging::info(), pid_master, sem, SEM_OPEN_FILE, and shmid.

Referenced by link_up(), and stop_cache_maintenance().

link_up()

static bool link_up ( )

static

Set system wide inter process link up.

Returns

On success, returns true. On error, returns false. Check errno for details.

Definition at line 172 of file cache_maintenance.cc.

References Logging::debug(), Logging::error(), Logging::info(), link_down(), master, pid_master, sem, SEM_OPEN_FILE, and shmid.

Referenced by start_cache_maintenance().

maintenance_handler()

static void maintenance_handler ( int  sig, __attribute__((unused)) siginfo_t *  si, __attribute__((unused)) void *  uc  )

static

Run maintenance handler.

Parameters

[in]	sig	- Signal, must be SIGMAINT.
[in]	si
[in]	uc

Definition at line 67 of file cache_maintenance.cc.

References Logging::info(), master, master_check(), SIGMAINT, and transcoder_cache_maintenance().

Referenced by start_timer().

master_check()

static void master_check ( )

static

Check if a master is already running. We become master if not.

Definition at line 238 of file cache_maintenance.cc.

References Logging::info(), master, pid_master, sem, and Logging::trace().

Referenced by maintenance_handler().

start_cache_maintenance()

bool start_cache_maintenance

(

time_t

interval

)

Start cache maintenance timer.

Parameters

[in]

interval

- Interval in seconds to run timer at.

Returns

On success, returns true. On error, returns false. Check errno for details.

Definition at line 319 of file cache_maintenance.cc.

References link_up(), and start_timer().

Referenced by ffmpegfs_init().

start_timer()

static bool start_timer ( time_t  interval )

static

Start the maintenance timer at predefined interval.

Parameters

[in]

interval

- Timer interval in seconds.

Returns

On success, returns true. On error, returns false. Check errno for details.

Definition at line 89 of file cache_maintenance.cc.

References CLOCKID, Logging::error(), format_time(), maintenance_handler(), mask, SIGMAINT, timerid, and Logging::trace().

Referenced by start_cache_maintenance().

stop_cache_maintenance()

bool stop_cache_maintenance

(

)

Stop cache maintenance timer.

Returns

On success, returns true. On error, returns false. Check errno for details.

Definition at line 331 of file cache_maintenance.cc.

References link_down(), and stop_timer().

Referenced by ffmpegfs_destroy().

stop_timer()

static bool stop_timer ( )

static

Stop the maintenance timer.

Returns

On success, returns true. On error, returns false. Check errno for details.

Definition at line 155 of file cache_maintenance.cc.

References Logging::error(), Logging::info(), and timerid.

Referenced by stop_cache_maintenance().

Variable Documentation

mask

sigset_t mask

static

Process mask for timer.

Definition at line 46 of file cache_maintenance.cc.

Referenced by start_timer().

master

bool master

static

If true, we are master.

Definition at line 52 of file cache_maintenance.cc.

Referenced by link_up(), maintenance_handler(), and master_check().

pid_master

pid_t* pid_master

static

PID of master process.

Definition at line 51 of file cache_maintenance.cc.

Referenced by link_down(), link_up(), and master_check().

sem

sem_t* sem

static

Semaphore used to synchronise between master and slave processes.

Definition at line 49 of file cache_maintenance.cc.

Referenced by link_down(), link_up(), and master_check().

shmid

int shmid

static

Shared memory segment ID.

Definition at line 50 of file cache_maintenance.cc.

Referenced by link_down(), and link_up().

timerid

timer_t timerid

static

Timer id.

Definition at line 47 of file cache_maintenance.cc.

Referenced by start_timer(), and stop_timer().