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sched.c    131 lines (107 with data), 2.5 kB

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/*
* sched.c
*
* Description:
* POSIX thread functions that deal with thread scheduling.
*/
#define ENOSUP 0
#include <errno.h>
#include "pthread.h"
#include "implement.h"
static int
is_attr(const pthread_attr_t *attr)
{
return (attr == NULL || attr->valid != _PTHREAD_ATTR_VALID) ? 1 : 0;
}
int
pthread_attr_setschedparam(pthread_attr_t *attr,
const struct sched_param *param)
{
if (is_attr(attr) != 0 || param == NULL)
{
return EINVAL;
}
attr->priority = param->sched_priority;
return 0;
}
int pthread_attr_getschedparam(const pthread_attr_t *attr,
struct sched_param *param)
{
if (is_attr(attr) != 0 || param == NULL)
{
return EINVAL;
}
param->sched_priority = attr->priority;
return 0;
}
int pthread_setschedparam(pthread_t thread, int policy,
const struct sched_param *param)
{
/* Validate the thread id. */
if (_PTHREAD_VALID(thread) < 0)
{
return EINVAL;
}
/* Validate the scheduling policy. */
if (policy < SCHED_MIN || policy > SCHED_MAX)
{
return EINVAL;
}
/* Ensure the policy is SCHED_OTHER. */
if (policy != SCHED_OTHER)
{
return ENOSUP;
}
/* Validate priority level. */
if (param->sched_priority < sched_get_priority_min(policy) ||
param->sched_priority > sched_get_priority_max(policy))
{
return EINVAL;
}
/* This is practically guaranteed to return TRUE. */
(void) SetThreadPriority(thread->win32handle, param->sched_priority);
return 0;
}
int pthread_getschedparam(pthread_t thread, int *policy,
struct sched_param *param)
{
int prio;
/* Validate the thread id. */
if (_PTHREAD_VALID(thread) != 0)
{
return EINVAL;
}
/* Validate the param structure. */
if (param == NULL)
{
return EINVAL;
}
/* Fill out the policy. */
*policy = SCHED_OTHER;
/* Fill out the sched_param structure. */
prio = GetThreadPriority(thread->win32handle);
if (prio == THREAD_PRIORITY_ERROR_RETURN)
{
return EINVAL;
}
param->sched_priority = prio;
return 0;
}
int sched_get_priority_max(int policy)
{
if (policy < SCHED_MIN || policy > SCHED_MAX)
{
return EINVAL;
}
/* This is independent of scheduling policy in Win32. */
return THREAD_PRIORITY_HIGHEST;
}
int sched_get_priority_min(int policy)
{
if (policy < SCHED_MIN || policy > SCHED_MAX)
{
return EINVAL;
}
/* This is independent of scheduling policy in Win32. */
return THREAD_PRIORITY_LOWEST;
}