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#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sched.h> /* for cpu sets */
#include "litmus.h"
#include "internal.h"
#define LP(name) {name ## _SEM, #name}
static struct {
int id;
const char* name;
} protocol[] = {
LP(FMLP),
LP(SRP),
LP(MPCP),
LP(MPCP_VS),
{MPCP_VS_SEM, "MPCP-VS"},
LP(DPCP),
LP(PCP),
LP(DFLP),
LP(OMLP),
};
#define NUM_PROTOS (sizeof(protocol)/sizeof(protocol[0]))
int lock_protocol_for_name(const char* name)
{
int i;
for (i = 0; i < NUM_PROTOS; i++)
if (strcmp(name, protocol[i].name) == 0)
return protocol[i].id;
return -1;
}
const char* name_for_lock_protocol(int id)
{
int i;
for (i = 0; i < NUM_PROTOS; i++)
if (protocol[i].id == id)
return protocol[i].name;
return "<UNKNOWN>";
}
int litmus_open_lock(
obj_type_t protocol,
int lock_id,
const char* namespace,
void *config_param)
{
int fd, od;
fd = open(namespace, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
if (fd < 0)
return -1;
od = od_openx(fd, protocol, lock_id, config_param);
close(fd);
return od;
}
void show_rt_param(struct rt_task* tp)
{
printf("rt params:\n\t"
"exec_cost:\t%llu\n\tperiod:\t\t%llu\n\tcpu:\t%d\n",
tp->exec_cost, tp->period, tp->cpu);
}
void init_rt_task_param(struct rt_task* tp)
{
/* Defaults:
* - implicit deadline (t->relative_deadline == 0)
* - phase = 0
* - class = RT_CLASS_SOFT
* - budget policy = NO_ENFORCEMENT
* - fixed priority = LITMUS_LOWEST_PRIORITY
* - release policy = TASK_SPORADIC
* - cpu assignment = 0
*
* User must still set the following fields to non-zero values:
* - tp->exec_cost
* - tp->period
*
* User must set tp->cpu to the appropriate value for non-global
* schedulers. For clusters, set tp->cpu to the first CPU in the
* assigned cluster.
*/
memset(tp, 0, sizeof(*tp));
tp->cls = RT_CLASS_SOFT;
tp->priority = LITMUS_LOWEST_PRIORITY;
tp->budget_policy = NO_ENFORCEMENT;
tp->release_policy = TASK_SPORADIC;
}
task_class_t str2class(const char* str)
{
if (!strcmp(str, "hrt"))
return RT_CLASS_HARD;
else if (!strcmp(str, "srt"))
return RT_CLASS_SOFT;
else if (!strcmp(str, "be"))
return RT_CLASS_BEST_EFFORT;
else
return -1;
}
#define NS_PER_MS 1000000
int sporadic_global(lt_t e_ns, lt_t p_ns)
{
struct rt_task param;
init_rt_task_param(¶m);
param.exec_cost = e_ns;
param.period = p_ns;
return set_rt_task_param(gettid(), ¶m);
}
int sporadic_partitioned(lt_t e_ns, lt_t p_ns, int partition)
{
int ret;
struct rt_task param;
ret = be_migrate_to_domain(partition);
check("be_migrate_to_domain()");
if (ret != 0)
return ret;
init_rt_task_param(¶m);
param.exec_cost = e_ns;
param.period = p_ns;
param.cpu = domain_to_first_cpu(partition);
return set_rt_task_param(gettid(), ¶m);
}
int sporadic_clustered(lt_t e_ns, lt_t p_ns, int cluster)
{
int ret;
struct rt_task param;
ret = be_migrate_to_domain(cluster);
check("be_migrate_to_cluster()");
if (ret != 0)
return ret;
init_rt_task_param(¶m);
param.exec_cost = e_ns;
param.period = p_ns;
param.cpu = domain_to_first_cpu(cluster);
return set_rt_task_param(gettid(), ¶m);
}
int init_kernel_iface(void);
int init_litmus(void)
{
int ret, ret2;
ret = mlockall(MCL_CURRENT | MCL_FUTURE);
check("mlockall()");
ret2 = init_rt_thread();
return (ret == 0) && (ret2 == 0) ? 0 : -1;
}
int init_rt_thread(void)
{
int ret;
ret = init_kernel_iface();
check("kernel <-> user space interface initialization");
return ret;
}
void exit_litmus(void)
{
/* nothing to do in current version */
}
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