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)
void	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.
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 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 <kpfleming@digium.com>

Russell Bryant <russell@digium.com>

Definition in file timing.c.

---

Function Documentation

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

Definition at line 71 of file timing.c.

References ast_calloc, ast_heap_push(), ast_heap_unlock(), ast_heap_wrlock(), timing_holder::iface, timing_holder::mod, 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_get_event, ast_timing_interface::timer_get_max_rate, ast_timing_interface::timer_open, and ast_timing_interface::timer_set_rate.

{
   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) {
      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;
}

void 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.

Returns:

nothing

Since:

1.6.1

Definition at line 167 of file timing.c.

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

Referenced by __ast_read(), timing_read(), and timing_test().

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

void ast_timer_close

(

struct ast_timer *

handle

)

Close an opened timing handle.

Parameters:

handle

timer handle returned from timer_open()

Returns:

nothing

Since:

1.6.1

Definition at line 146 of file timing.c.

References ast_free, ast_module_unref(), ast_timer::fd, ast_timer::holder, timing_holder::iface, timing_holder::mod, and ast_timing_interface::timer_close.

Referenced by __ast_channel_alloc_ap(), __unload_module(), ast_channel_free(), load_module(), and timing_test().

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

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.

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

Referenced by __ast_read().

{
   int res = -1;

   res = handle->holder->iface->timer_disable_continuous(handle->fd);

   return res;
}

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 172 of file timing.c.

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

Referenced by __ast_queue_frame().

{
   int res = -1;

   res = handle->holder->iface->timer_enable_continuous(handle->fd);

   return res;
}

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 153 of file timing.c.

References ast_timer::fd.

Referenced by __ast_channel_alloc_ap(), network_thread(), and timing_test().

{
   return handle->fd;
}

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 190 of file timing.c.

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

Referenced by __ast_read().

{
   enum ast_timer_event res = -1;

   res = handle->holder->iface->timer_get_event(handle->fd);

   return res;
}

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 199 of file timing.c.

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

Referenced by ast_settimeout().

{
   unsigned int res = 0;

   res = handle->holder->iface->timer_get_max_rate(handle->fd);

   return res;
}

struct ast_timer* ast_timer_open

(

void

)

[read]

Open a timer.

Return values:

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

Since:

1.6.1

Definition at line 119 of file timing.c.

References ast_calloc, ast_heap_peek(), ast_heap_rdlock(), ast_heap_unlock(), ast_module_ref(), ast_timer::fd, ast_timer::holder, timing_holder::iface, timing_holder::mod, ast_timing_interface::timer_close, and ast_timing_interface::timer_open.

Referenced by __ast_channel_alloc_ap(), load_module(), and timing_test().

{
   int fd = -1;
   struct timing_holder *h;
   struct ast_timer *t = NULL;

   ast_heap_rdlock(timing_interfaces);

   if ((h = ast_heap_peek(timing_interfaces, 1))) {
      fd = h->iface->timer_open();
      ast_module_ref(h->mod);
   }

   if (fd != -1) {
      if (!(t = ast_calloc(1, sizeof(*t)))) {
         h->iface->timer_close(fd);
      } else {
         t->fd = fd;
         t->holder = h;
      }
   }

   ast_heap_unlock(timing_interfaces);

   return t;
}

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 158 of file timing.c.

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

Referenced by __ast_read(), ast_settimeout(), load_module(), and timing_test().

{
   int res = -1;

   res = handle->holder->iface->timer_set_rate(handle->fd, rate);

   return res;
}

int ast_timing_init

(

void

)

Provided by timing.c

Definition at line 283 of file timing.c.

References ARRAY_LEN, ast_cli_register_multiple(), ast_heap_create(), and timing_holder_cmp().

Referenced by main().

{
   if (!(timing_interfaces = ast_heap_create(2, timing_holder_cmp, 0))) {
      return -1;
   }

   return ast_cli_register_multiple(cli_timing, ARRAY_LEN(cli_timing));
}

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 101 of file timing.c.

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

Referenced by unload_module().

{
   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;
}

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

Definition at line 57 of file timing.c.

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

Referenced by ast_timing_init().

{
   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;
   }
}

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

Definition at line 208 of file timing.c.

References ast_cli_args::argc, ast_cli_args::argv, 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, errno, ast_cli_args::fd, ast_timer::holder, timing_holder::iface, ast_timing_interface::name, timer, and ast_cli_entry::usage.

{
   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, 100/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++;
         ast_timer_ack(timer, 1);
      } 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);

   ast_cli(a->fd, "It has been %d milliseconds, and we got %d timer ticks\n", 
      ast_tvdiff_ms(end, start), count);

   return CLI_SUCCESS;
}

---

Variable Documentation

struct ast_cli_entry cli_timing[] [static]

Initial value:

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

Definition at line 279 of file timing.c.

struct ast_heap* timing_interfaces [static]

Definition at line 50 of file timing.c.