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/*
* Copyright (C) 2010 Marc Kleine-Budde <mkl@pengutronix.de>
*/
#include <common.h>
#include <driver.h>
#include <malloc.h>
#include <module.h>
#include <param.h>
#include <poller.h>
#include <clock.h>
static LIST_HEAD(poller_list);
static int __poller_active;
bool poller_active(void)
{
return __poller_active;
}
int poller_register(struct poller_struct *poller, const char *name)
{
if (poller->registered)
return -EBUSY;
poller->name = xstrdup(name);
list_add_tail(&poller->list, &poller_list);
poller->registered = 1;
return 0;
}
int poller_unregister(struct poller_struct *poller)
{
if (!poller->registered)
return -ENODEV;
list_del(&poller->list);
poller->registered = 0;
free(poller->name);
return 0;
}
static void poller_async_callback(struct poller_struct *poller)
{
struct poller_async *pa = container_of(poller, struct poller_async, poller);
if (!pa->active)
return;
if (get_time_ns() < pa->end)
return;
pa->active = 0;
pa->fn(pa->ctx);
}
/*
* Cancel an outstanding asynchronous function call
*
* @pa the poller that has been scheduled
*
* Cancel an outstanding function call. Returns 0 if the call
* has actually been cancelled or -ENODEV when the call wasn't
* scheduled.
*
*/
int poller_async_cancel(struct poller_async *pa)
{
pa->active = 0;
return 0;
}
/*
* Call a function asynchronously
*
* @pa the poller to be used
* @delay The delay in nanoseconds
* @fn The function to call
* @ctx context pointer passed to the function
*
* This calls the passed function after a delay of delay_ns. Returns
* a pointer which can be used as a cookie to cancel a scheduled call.
*/
int poller_call_async(struct poller_async *pa, uint64_t delay_ns,
void (*fn)(void *), void *ctx)
{
pa->ctx = ctx;
pa->end = get_time_ns() + delay_ns;
pa->fn = fn;
pa->active = 1;
return 0;
}
int poller_async_register(struct poller_async *pa, const char *name)
{
pa->poller.func = poller_async_callback;
pa->active = 0;
return poller_register(&pa->poller, name);
}
int poller_async_unregister(struct poller_async *pa)
{
return poller_unregister(&pa->poller);
}
void poller_call(void)
{
struct poller_struct *poller, *tmp;
__poller_active = 1;
list_for_each_entry_safe(poller, tmp, &poller_list, list)
poller->func(poller);
__poller_active = 0;
}
#if defined CONFIG_CMD_POLLER
#include <command.h>
#include <getopt.h>
static void poller_time(void)
{
uint64_t start = get_time_ns();
int i = 0;
/*
* How many times we can run the registered pollers in one second?
*
* A low number here may point to problems with pollers taking too
* much time.
*/
while (!is_timeout(start, SECOND))
i++;
printf("%d poller calls in 1s\n", i);
}
static void poller_info(void)
{
struct poller_struct *poller;
printf("Registered pollers:\n");
if (list_empty(&poller_list)) {
printf("<none>\n");
return;
}
list_for_each_entry(poller, &poller_list, list)
printf("%s\n", poller->name);
}
BAREBOX_CMD_HELP_START(poller)
BAREBOX_CMD_HELP_TEXT("print info about registered pollers")
BAREBOX_CMD_HELP_TEXT("")
BAREBOX_CMD_HELP_TEXT("Options:")
BAREBOX_CMD_HELP_OPT ("-i", "Print information about registered pollers")
BAREBOX_CMD_HELP_OPT ("-t", "measure how many pollers we run in 1s")
BAREBOX_CMD_HELP_END
static int do_poller(int argc, char *argv[])
{
int opt;
while ((opt = getopt(argc, argv, "it")) > 0) {
switch (opt) {
case 'i':
poller_info();
return 0;
case 't':
poller_time();
return 0;
}
}
return COMMAND_ERROR_USAGE;
}
BAREBOX_CMD_START(poller)
.cmd = do_poller,
BAREBOX_CMD_DESC("print info about registered pollers")
BAREBOX_CMD_GROUP(CMD_GRP_MISC)
BAREBOX_CMD_HELP(cmd_poller_help)
BAREBOX_CMD_END
#endif
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