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pthread_setschedparam.c    124 lines (106 with data), 3.3 kB

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/*
* sched_setschedparam.c
*
* Description:
* POSIX thread functions that deal with thread scheduling.
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2005 Pthreads-win32 contributors
*
* Contact Email: rpj@callisto.canberra.edu.au
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "pthread.h"
#include "implement.h"
#include "sched.h"
int
pthread_setschedparam (pthread_t thread, int policy,
const struct sched_param *param)
{
int result;
/* Validate the thread id. */
result = pthread_kill (thread, 0);
if (0 != result)
{
return result;
}
/* Validate the scheduling policy. */
if (policy < SCHED_MIN || policy > SCHED_MAX)
{
return EINVAL;
}
/* Ensure the policy is SCHED_OTHER. */
if (policy != SCHED_OTHER)
{
return ENOTSUP;
}
return (ptw32_setthreadpriority (thread, policy, param->sched_priority));
}
int
ptw32_setthreadpriority (pthread_t thread, int policy, int priority)
{
int prio;
ptw32_mcs_local_node_t threadLock;
int result = 0;
ptw32_thread_t * tp = (ptw32_thread_t *) thread.p;
prio = priority;
/* Validate priority level. */
if (prio < sched_get_priority_min (policy) ||
prio > sched_get_priority_max (policy))
{
return EINVAL;
}
#if (THREAD_PRIORITY_LOWEST > THREAD_PRIORITY_NORMAL)
/* WinCE */
#else
/* Everything else */
if (THREAD_PRIORITY_IDLE < prio && THREAD_PRIORITY_LOWEST > prio)
{
prio = THREAD_PRIORITY_LOWEST;
}
else if (THREAD_PRIORITY_TIME_CRITICAL > prio
&& THREAD_PRIORITY_HIGHEST < prio)
{
prio = THREAD_PRIORITY_HIGHEST;
}
#endif
ptw32_mcs_lock_acquire (&tp->threadLock, &threadLock);
/* If this fails, the current priority is unchanged. */
if (0 == SetThreadPriority (tp->threadH, prio))
{
result = EINVAL;
}
else
{
/*
* Must record the thread's sched_priority as given,
* not as finally adjusted.
*/
tp->sched_priority = priority;
}
ptw32_mcs_lock_release (&threadLock);
return result;
}