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#include <stdio.h>
#include "litmus.h"
#include "internal.h"
#include "asm.h"
/* per real-time thread kernel <-> user space flags */
struct np_flag {
#define RT_PREEMPTIVE 0x2050 /* = NP */
#define RT_NON_PREEMPTIVE 0x4e50 /* = P */
unsigned short preemptivity;
#define RT_EXIT_NP_REQUESTED 0x5251 /* = RQ */
unsigned short request;
unsigned int ctr;
};
int register_np_flag(struct np_flag* flag);
int signal_exit_np(void);
#ifndef __sparc__
static __thread struct np_flag np_flag;
#endif
int init_kernel_iface(void)
{
int ret = 0;
#ifndef __sparc__ /* currently not supported in sparc64 */
np_flag.preemptivity = RT_PREEMPTIVE;
np_flag.ctr = 0;
ret = register_np_flag(&np_flag);
check("register_np_flag()");
#endif
return ret;
}
void enter_np(void)
{
#ifndef __sparc__
if (++np_flag.ctr == 1)
{
np_flag.request = 0;
barrier();
np_flag.preemptivity = RT_NON_PREEMPTIVE;
}
#else
fprintf(stderr, "enter_np: not implemented!\n");
#endif
}
void exit_np(void)
{
#ifndef __sparc__
if (--np_flag.ctr == 0)
{
np_flag.preemptivity = RT_PREEMPTIVE;
barrier();
if (np_flag.request == RT_EXIT_NP_REQUESTED)
signal_exit_np();
}
#else
fprintf(stderr, "exit_np: not implemented!\n");
#endif
}
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