Back to index

glibc  2.9
Functions | Variables
tpp.c File Reference
#include <assert.h>
#include <atomic.h>
#include <errno.h>
#include <pthreadP.h>
#include <sched.h>
#include <stdlib.h>

Go to the source code of this file.

Functions

void __init_sched_fifo_prio (void)
int __pthread_tpp_change_priority (int previous_prio, int new_prio)
int __pthread_current_priority (void)

Variables

int __sched_fifo_min_prio = -1
int __sched_fifo_max_prio = -1

Function Documentation

void __init_sched_fifo_prio ( void  )

Definition at line 33 of file tpp.c.

Here is the call graph for this function:

Here is the caller graph for this function:

Definition at line 138 of file tpp.c.

{
  struct pthread *self = THREAD_SELF;
  if ((self->flags & (ATTR_FLAG_POLICY_SET | ATTR_FLAG_SCHED_SET))
      == (ATTR_FLAG_POLICY_SET | ATTR_FLAG_SCHED_SET))
    return self->schedparam.sched_priority;

  int result = 0;

  lll_lock (self->lock, LLL_PRIVATE);

  if ((self->flags & ATTR_FLAG_SCHED_SET) == 0)
    {
      if (__sched_getparam (self->tid, &self->schedparam) != 0)
       result = -1;
      else
       self->flags |= ATTR_FLAG_SCHED_SET;
    }

  if ((self->flags & ATTR_FLAG_POLICY_SET) == 0)
    {
      self->schedpolicy = __sched_getscheduler (self->tid);
      if (self->schedpolicy == -1)
       result = -1;
      else
       self->flags |= ATTR_FLAG_POLICY_SET;
    }

  if (result != -1)
    result = self->schedparam.sched_priority;

  lll_unlock (self->lock, LLL_PRIVATE);

  return result;
}

Here is the call graph for this function:

Here is the caller graph for this function:

int __pthread_tpp_change_priority ( int  previous_prio,
int  new_prio 
)

Definition at line 41 of file tpp.c.

{
  struct pthread *self = THREAD_SELF;
  struct priority_protection_data *tpp = THREAD_GETMEM (self, tpp);

  if (tpp == NULL)
    {
      if (__sched_fifo_min_prio == -1)
       __init_sched_fifo_prio ();

      size_t size = sizeof *tpp;
      size += (__sched_fifo_max_prio - __sched_fifo_min_prio + 1)
             * sizeof (tpp->priomap[0]);
      tpp = calloc (size, 1);
      if (tpp == NULL)
       return ENOMEM;
      tpp->priomax = __sched_fifo_min_prio - 1;
      THREAD_SETMEM (self, tpp, tpp);
    }

  assert (new_prio == -1
         || (new_prio >= __sched_fifo_min_prio
             && new_prio <= __sched_fifo_max_prio));
  assert (previous_prio == -1
         || (previous_prio >= __sched_fifo_min_prio
             && previous_prio <= __sched_fifo_max_prio));

  int priomax = tpp->priomax;
  int newpriomax = priomax;
  if (new_prio != -1)
    {
      if (tpp->priomap[new_prio - __sched_fifo_min_prio] + 1 == 0)
       return EAGAIN;
      ++tpp->priomap[new_prio - __sched_fifo_min_prio];
      if (new_prio > priomax)
       newpriomax = new_prio;
    }

  if (previous_prio != -1)
    {
      if (--tpp->priomap[previous_prio - __sched_fifo_min_prio] == 0
         && priomax == previous_prio
         && previous_prio > new_prio)
       {
         int i;
         for (i = previous_prio - 1; i >= __sched_fifo_min_prio; --i)
           if (tpp->priomap[i - __sched_fifo_min_prio])
             break;
         newpriomax = i;
       }
    }

  if (priomax == newpriomax)
    return 0;

  lll_lock (self->lock, LLL_PRIVATE);

  tpp->priomax = newpriomax;

  int result = 0;

  if ((self->flags & ATTR_FLAG_SCHED_SET) == 0)
    {
      if (__sched_getparam (self->tid, &self->schedparam) != 0)
       result = errno;
      else
       self->flags |= ATTR_FLAG_SCHED_SET;
    }

  if ((self->flags & ATTR_FLAG_POLICY_SET) == 0)
    {
      self->schedpolicy = __sched_getscheduler (self->tid);
      if (self->schedpolicy == -1)
       result = errno;
      else
       self->flags |= ATTR_FLAG_POLICY_SET;
    }

  if (result == 0)
    {
      struct sched_param sp = self->schedparam;
      if (sp.sched_priority < newpriomax || sp.sched_priority < priomax)
       {
         if (sp.sched_priority < newpriomax)
           sp.sched_priority = newpriomax;

         if (__sched_setscheduler (self->tid, self->schedpolicy, &sp) < 0)
           result = errno;
       }
    }

  lll_unlock (self->lock, LLL_PRIVATE);

  return result;
}

Here is the call graph for this function:

Here is the caller graph for this function:


Variable Documentation

Definition at line 30 of file tpp.c.

Definition at line 29 of file tpp.c.