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/**
* @file realtime.c Real-Time scheduling
*
* Copyright (C) 2010 Creytiv.com
*/
#include <re.h>
#include <baresip.h>
#ifdef DARWIN
#include <sys/types.h>
#include <sys/sysctl.h>
#include <stdio.h>
#include <mach/mach.h>
#ifdef __APPLE__
#include "TargetConditionals.h"
#endif
#endif
#ifdef DARWIN
static int set_realtime(int period, int computation, int constraint)
{
struct thread_time_constraint_policy ttcpolicy;
int ret;
ttcpolicy.period = period; /* HZ/160 */
ttcpolicy.computation = computation; /* HZ/3300 */
ttcpolicy.constraint = constraint; /* HZ/2200 */
ttcpolicy.preemptible = 1;
ret = thread_policy_set(mach_thread_self(),
THREAD_TIME_CONSTRAINT_POLICY,
(thread_policy_t)&ttcpolicy,
THREAD_TIME_CONSTRAINT_POLICY_COUNT);
if (ret != KERN_SUCCESS)
return ENOSYS;
return 0;
}
#endif
/**
* Enable real-time scheduling (for selected platforms)
*
* @param enable True to enable, false to disable
* @param fps Wanted video framerate
*
* @return 0 if success, otherwise errorcode
*/
int realtime_enable(bool enable, int fps)
{
#ifdef DARWIN
if (enable) {
#if TARGET_OS_IPHONE
int bus_speed = 100000000;
#else
int ret, bus_speed;
int mib[2] = { CTL_HW, HW_BUS_FREQ };
size_t len;
len = sizeof(bus_speed);
ret = sysctl (mib, 2, &bus_speed, &len, NULL, 0);
if (ret < 0) {
return ENOSYS;
}
info("realtime: fps=%d bus_speed=%d\n", fps, bus_speed);
#endif
return set_realtime(bus_speed / fps,
bus_speed / 3300, bus_speed / 2200);
}
else {
kern_return_t ret;
thread_standard_policy_data_t pt;
mach_msg_type_number_t cnt = THREAD_STANDARD_POLICY_COUNT;
boolean_t get_default = TRUE;
ret = thread_policy_get(mach_thread_self(),
THREAD_STANDARD_POLICY,
(thread_policy_t)&pt,
&cnt, &get_default);
if (KERN_SUCCESS != ret)
return ENOSYS;
ret = thread_policy_set(mach_thread_self(),
THREAD_STANDARD_POLICY,
(thread_policy_t)&pt,
THREAD_STANDARD_POLICY_COUNT);
if (KERN_SUCCESS != ret)
return ENOSYS;
return 0;
}
#else
(void)enable;
(void)fps;
return ENOSYS;
#endif
}
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