timing.c File Reference

Timing source management. More...

#include "asterisk.h"
#include "asterisk/_private.h"
#include "asterisk/timing.h"
#include "asterisk/lock.h"
#include "asterisk/cli.h"
#include "asterisk/utils.h"
#include "asterisk/time.h"
#include "asterisk/heap.h"
#include "asterisk/module.h"
#include "asterisk/poll-compat.h"

Include dependency graph for timing.c:

Go to the source code of this file.

Data Structures
struct	ast_timer
struct	timing_holder

Functions
void *	_ast_register_timing_interface (struct ast_timing_interface *funcs, struct ast_module *mod)
int	ast_timer_ack (const struct ast_timer *handle, unsigned int quantity)
	Acknowledge a timer event.
void	ast_timer_close (struct ast_timer *handle)
	Close an opened timing handle.
int	ast_timer_disable_continuous (const struct ast_timer *handle)
	Disable continuous mode.
int	ast_timer_enable_continuous (const struct ast_timer *handle)
	Enable continuous mode.
int	ast_timer_fd (const struct ast_timer *handle)
	Get a poll()-able file descriptor for a timer.
enum ast_timer_event	ast_timer_get_event (const struct ast_timer *handle)
	Retrieve timing event.
unsigned int	ast_timer_get_max_rate (const struct ast_timer *handle)
	Get maximum rate supported for a timer.
const char *	ast_timer_get_name (const struct ast_timer *handle)
	Get name of timer in use.
struct ast_timer *	ast_timer_open (void)
	Open a timer.
int	ast_timer_set_rate (const struct ast_timer *handle, unsigned int rate)
	Set the timing tick rate.
int	ast_timing_init (void)
int	ast_unregister_timing_interface (void *handle)
	Unregister a previously registered timing interface.
static int	timing_holder_cmp (void *_h1, void *_h2)
static void	timing_shutdown (void)
static char *	timing_test (struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)

Variables
static struct ast_cli_entry	cli_timing []
static struct ast_heap *	timing_interfaces

Detailed Description

Timing source management.

Author

Kevin P. Fleming kpfle.nosp@m.ming.nosp@m.@digi.nosp@m.um.c.nosp@m.om

Russell Bryant russe.nosp@m.ll@d.nosp@m.igium.nosp@m..com

Definition in file timing.c.

Function Documentation

_ast_register_timing_interface()

void * _ast_register_timing_interface	(	struct ast_timing_interface *	funcs,
		struct ast_module *	mod
	)

Definition at line 73 of file timing.c.

{
    struct timing_holder *h;
 
    if (!funcs->timer_open ||
        !funcs->timer_close ||
        !funcs->timer_set_rate ||
        !funcs->timer_ack ||
        !funcs->timer_get_event ||
        !funcs->timer_get_max_rate ||
        !funcs->timer_enable_continuous ||
        !funcs->timer_disable_continuous ||
        !funcs->timer_fd) {
        return NULL;
    }
 
    if (!(h = ast_calloc(1, sizeof(*h)))) {
        return NULL;
    }
 
    h->iface = funcs;
    h->mod = mod;
 
    ast_heap_wrlock(timing_interfaces);
    ast_heap_push(timing_interfaces, h);
    ast_heap_unlock(timing_interfaces);
 
    return h;
}

References ast_calloc, ast_heap_push, ast_heap_unlock, ast_heap_wrlock, timing_holder::iface, timing_holder::mod, NULL, ast_timing_interface::timer_ack, ast_timing_interface::timer_close, ast_timing_interface::timer_disable_continuous, ast_timing_interface::timer_enable_continuous, ast_timing_interface::timer_fd, ast_timing_interface::timer_get_event, ast_timing_interface::timer_get_max_rate, ast_timing_interface::timer_open, ast_timing_interface::timer_set_rate, and timing_interfaces.

ast_timer_ack()

int ast_timer_ack	(	const struct ast_timer *	handle,
		unsigned int	quantity
	)

Acknowledge a timer event.

Parameters

handle	timer handle returned from timer_open()
quantity	number of timer events to acknowledge

Note

This function should only be called if timer_get_event() returned AST_TIMING_EVENT_EXPIRED.

Return values

-1	failure, with errno set
0	success

Since

10.5.2

Definition at line 171 of file timing.c.

{
    return handle->holder->iface->timer_ack(handle->data, quantity);
}

References ast_timer::data, ast_timer::holder, timing_holder::iface, and ast_timing_interface::timer_ack.

Referenced by __ast_read(), hook_event_cb(), monmp3thread(), snoop_read(), softmix_mixing_loop(), spandsp_fax_read(), timing_read(), timing_test(), and webchan_read().

ast_timer_close()

void ast_timer_close

(

struct ast_timer *

handle

)

Close an opened timing handle.

Parameters

handle

timer handle returned from timer_open()

Since

1.6.1

Definition at line 154 of file timing.c.

{
    handle->holder->iface->timer_close(handle->data);
    ast_module_unref(handle->holder->mod);
    ast_free(handle);
}

References ast_free, ast_module_unref, ast_timer::data, ast_timer::holder, timing_holder::iface, timing_holder::mod, and ast_timing_interface::timer_close.

Referenced by __unload_module(), ast_channel_destructor(), init_app_class(), jb_framedata_destroy(), load_module(), local_ast_moh_start(), moh_class_destructor(), session_destroy(), snoop_destroy(), softmix_bridge_data_destroy(), timing_test(), and websocket_destructor().

ast_timer_disable_continuous()

int ast_timer_disable_continuous

(

const struct ast_timer *

handle

)

Disable continuous mode.

Parameters

handle

timer handle returned from timer_close()

Return values

-1	failure, with errno set
0	success

Since

1.6.1

Definition at line 181 of file timing.c.

{
    return handle->holder->iface->timer_disable_continuous(handle->data);
}

References ast_timer::data, ast_timer::holder, timing_holder::iface, and ast_timing_interface::timer_disable_continuous.

Referenced by __ast_read().

ast_timer_enable_continuous()

int ast_timer_enable_continuous

(

const struct ast_timer *

handle

)

Enable continuous mode.

Parameters

handle

timer handle returned from timer_open()

Continuous mode causes poll() on the timer's fd to immediately return always until continuous mode is disabled.

Return values

-1	failure, with errno set
0	success

Since

1.6.1

Definition at line 176 of file timing.c.

{
    return handle->holder->iface->timer_enable_continuous(handle->data);
}

References ast_timer::data, ast_timer::holder, timing_holder::iface, and ast_timing_interface::timer_enable_continuous.

Referenced by __ast_queue_frame().

ast_timer_fd()

int ast_timer_fd

(

const struct ast_timer *

handle

)

Get a poll()-able file descriptor for a timer.

Parameters

handle

timer handle returned from timer_open()

Returns

file descriptor which can be used with poll() to wait for events

Since

1.6.1

Definition at line 161 of file timing.c.

{
    return handle->holder->iface->timer_fd(handle->data);
}

References ast_timer::data, ast_timer::holder, timing_holder::iface, and ast_timing_interface::timer_fd.

Referenced by __ast_channel_alloc_ap(), jb_framedata_init(), monmp3thread(), network_thread(), set_channel_timer(), softmix_mixing_loop(), spandsp_fax_new(), stasis_app_control_snoop(), and timing_test().

ast_timer_get_event()

enum ast_timer_event ast_timer_get_event

(

const struct ast_timer *

handle

)

Retrieve timing event.

Parameters

handle

timer handle returned by timer_open()

After poll() indicates that there is input on the timer's fd, this will be called to find out what triggered it.

Returns

which event triggered the timer

Since

1.6.1

Definition at line 186 of file timing.c.

{
    return handle->holder->iface->timer_get_event(handle->data);
}

References ast_timer::data, ast_timer::holder, timing_holder::iface, and ast_timing_interface::timer_get_event.

Referenced by __ast_read(), and webchan_read().

ast_timer_get_max_rate()

unsigned int ast_timer_get_max_rate

(

const struct ast_timer *

handle

)

Get maximum rate supported for a timer.

Parameters

handle

timer handle returned by timer_open()

Returns

maximum rate supported by timer

Since

1.6.1

Definition at line 191 of file timing.c.

{
    return handle->holder->iface->timer_get_max_rate(handle->data);
}

References ast_timer::data, ast_timer::holder, timing_holder::iface, and ast_timing_interface::timer_get_max_rate.

Referenced by ast_settimeout_full().

ast_timer_get_name()

const char * ast_timer_get_name

(

const struct ast_timer *

handle

)

Get name of timer in use.

Parameters

handle

timer handle returned by timer_open()

Returns

name of timer

Since

1.6.2

Definition at line 196 of file timing.c.

{
    return handle->holder->iface->name;
}

References ast_timer::holder, timing_holder::iface, and ast_timing_interface::name.

Referenced by __ast_channel_alloc_ap().

ast_timer_open()

struct ast_timer * ast_timer_open

(

void

)

Open a timer.

Return values

NULL	on error, with errno set
non-NULL	timer handle on success

Since

1.6.1

Definition at line 122 of file timing.c.

{
    void *data = NULL;
    struct timing_holder *h;
    struct ast_timer *t = NULL;
    int idx = 1;
 
    ast_heap_rdlock(timing_interfaces);
 
    while ((h = ast_heap_peek(timing_interfaces, idx))) {
        if (ast_module_running_ref(h->mod)) {
            data = h->iface->timer_open();
            break;
        }
        idx++;
    }
 
    if (data) {
        if (!(t = ast_calloc(1, sizeof(*t)))) {
            h->iface->timer_close(data);
            ast_module_unref(h->mod);
        } else {
            t->data = data;
            t->holder = h;
        }
    }
 
    ast_heap_unlock(timing_interfaces);
 
    return t;
}

References ast_calloc, ast_heap_peek(), ast_heap_rdlock, ast_heap_unlock, ast_module_running_ref, ast_module_unref, ast_timer::data, ast_timer::holder, timing_holder::iface, timing_holder::mod, NULL, ast_timing_interface::timer_close, ast_timing_interface::timer_open, and timing_interfaces.

Referenced by __ast_channel_alloc_ap(), init_app_class(), jb_framedata_init(), load_module(), local_ast_moh_start(), set_channel_timer(), softmix_bridge_create(), spandsp_fax_new(), stasis_app_control_snoop(), and timing_test().

ast_timer_set_rate()

int ast_timer_set_rate	(	const struct ast_timer *	handle,
		unsigned int	rate
	)

Set the timing tick rate.

Parameters

handle	timer handle returned from timer_open()
rate	ticks per second, 0 turns the ticks off if needed

Use this function if you want the timer to show input at a certain rate. The other alternative use of a timer is the continuous mode.

Return values

-1	error, with errno set
0	success

Since

1.6.1

Definition at line 166 of file timing.c.

{
    return handle->holder->iface->timer_set_rate(handle->data, rate);
}

References ast_timer::data, ast_timer::holder, timing_holder::iface, and ast_timing_interface::timer_set_rate.

Referenced by __ast_read(), ast_deactivate_generator(), ast_settimeout_full(), hook_event_cb(), init_app_class(), jb_framedata_init(), load_module(), local_ast_moh_start(), set_channel_timer(), set_config(), softmix_mixing_loop(), spandsp_fax_start(), stasis_app_control_snoop(), and timing_test().

ast_timing_init()

int ast_timing_init

(

void

)

Provided by timing.c

Definition at line 289 of file timing.c.

{
    if (!(timing_interfaces = ast_heap_create(2, timing_holder_cmp, 0))) {
        return -1;
    }
 
    ast_register_cleanup(timing_shutdown);
 
    return ast_cli_register_multiple(cli_timing, ARRAY_LEN(cli_timing));
}

References ARRAY_LEN, ast_cli_register_multiple, ast_heap_create, ast_register_cleanup(), cli_timing, timing_holder_cmp(), timing_interfaces, and timing_shutdown().

Referenced by asterisk_daemon().

ast_unregister_timing_interface()

int ast_unregister_timing_interface

(

void *

handle

)

Unregister a previously registered timing interface.

Parameters

handle

The handle returned from a prior successful call to ast_register_timing_interface().

Return values

0	success
non-zero	failure

Since

1.6.1

Definition at line 104 of file timing.c.

{
    struct timing_holder *h = handle;
    int res = -1;
 
    ast_heap_wrlock(timing_interfaces);
    h = ast_heap_remove(timing_interfaces, h);
    ast_heap_unlock(timing_interfaces);
 
    if (h) {
        ast_free(h);
        h = NULL;
        res = 0;
    }
 
    return res;
}

References ast_free, ast_heap_remove(), ast_heap_unlock, ast_heap_wrlock, NULL, and timing_interfaces.

Referenced by unload_module(), unload_module(), unload_module(), and unload_module().

timing_holder_cmp()

static int timing_holder_cmp ( void *  _h1, void *  _h2  )

static

Definition at line 59 of file timing.c.

{
    struct timing_holder *h1 = _h1;
    struct timing_holder *h2 = _h2;
 
    if (h1->iface->priority > h2->iface->priority) {
        return 1;
    } else if (h1->iface->priority == h2->iface->priority) {
        return 0;
    } else {
        return -1;
    }
}

References timing_holder::iface, and ast_timing_interface::priority.

Referenced by ast_timing_init().

timing_shutdown()

static void timing_shutdown ( void  )

static

Definition at line 281 of file timing.c.

{
    ast_cli_unregister_multiple(cli_timing, ARRAY_LEN(cli_timing));
 
    ast_heap_destroy(timing_interfaces);
    timing_interfaces = NULL;
}

References ARRAY_LEN, ast_cli_unregister_multiple(), ast_heap_destroy(), cli_timing, NULL, and timing_interfaces.

Referenced by ast_timing_init().

timing_test()

static char * timing_test ( struct ast_cli_entry *  e, int  cmd, struct ast_cli_args *  a  )

static

Definition at line 201 of file timing.c.

{
    struct ast_timer *timer;
    int count = 0;
    struct timeval start, end;
    unsigned int test_rate = 50;
 
    switch (cmd) {
    case CLI_INIT:
        e->command = "timing test";
        e->usage = "Usage: timing test <rate>\n"
                   "   Test a timer with a specified rate, 50/sec by default.\n"
                   "";
        return NULL;
    case CLI_GENERATE:
        return NULL;
    }
 
    if (a->argc != 2 && a->argc != 3) {
        return CLI_SHOWUSAGE;
    }
 
    if (a->argc == 3) {
        unsigned int rate;
        if (sscanf(a->argv[2], "%30u", &rate) == 1) {
            test_rate = rate;
        } else {
            ast_cli(a->fd, "Invalid rate '%s', using default of %u\n", a->argv[2], test_rate);
        }
    }
 
    ast_cli(a->fd, "Attempting to test a timer with %u ticks per second.\n", test_rate);
 
    if (!(timer = ast_timer_open())) {
        ast_cli(a->fd, "Failed to open timing fd\n");
        return CLI_FAILURE;
    }
 
    ast_cli(a->fd, "Using the '%s' timing module for this test.\n", timer->holder->iface->name);
 
    start = ast_tvnow();
 
    ast_timer_set_rate(timer, test_rate);
 
    while (ast_tvdiff_ms((end = ast_tvnow()), start) < 1000) {
        int res;
        struct pollfd pfd = {
            .fd = ast_timer_fd(timer),
            .events = POLLIN | POLLPRI,
        };
 
        res = ast_poll(&pfd, 1, 100);
 
        if (res == 1) {
            count++;
            if (ast_timer_ack(timer, 1) < 0) {
                ast_cli(a->fd, "Timer failed to acknowledge.\n");
                ast_timer_close(timer);
                return CLI_FAILURE;
            }
        } else if (!res) {
            ast_cli(a->fd, "poll() timed out!  This is bad.\n");
        } else if (errno != EAGAIN && errno != EINTR) {
            ast_cli(a->fd, "poll() returned error: %s\n", strerror(errno));
        }
    }
 
    ast_timer_close(timer);
    timer = NULL;
 
    ast_cli(a->fd, "It has been %" PRIi64 " milliseconds, and we got %d timer ticks\n",
        ast_tvdiff_ms(end, start), count);
 
    return CLI_SUCCESS;
}

References a, ast_cli(), ast_poll, ast_timer_ack(), ast_timer_close(), ast_timer_fd(), ast_timer_open(), ast_timer_set_rate(), ast_tvdiff_ms(), ast_tvnow(), CLI_FAILURE, CLI_GENERATE, CLI_INIT, CLI_SHOWUSAGE, CLI_SUCCESS, ast_cli_entry::command, end, errno, ast_timer::holder, timing_holder::iface, ast_timing_interface::name, NULL, timer, and ast_cli_entry::usage.

Variable Documentation

cli_timing

struct ast_cli_entry cli_timing[]

static

Initial value:

= {
    { .handler =  timing_test , .summary =  "Run a timing test" ,},
}

Definition at line 277 of file timing.c.

                                           {
    AST_CLI_DEFINE(timing_test, "Run a timing test"),
};

Referenced by ast_timing_init(), and timing_shutdown().

timing_interfaces

struct ast_heap* timing_interfaces

static

Definition at line 52 of file timing.c.

Referenced by _ast_register_timing_interface(), ast_timer_open(), ast_timing_init(), ast_unregister_timing_interface(), and timing_shutdown().