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Diffstat (limited to 'nuttx/sched/pthread_setschedparam.c')
-rw-r--r-- | nuttx/sched/pthread_setschedparam.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/nuttx/sched/pthread_setschedparam.c b/nuttx/sched/pthread_setschedparam.c new file mode 100644 index 000000000..019a7c7a5 --- /dev/null +++ b/nuttx/sched/pthread_setschedparam.c @@ -0,0 +1,142 @@ +/**************************************************************************** + * pthread_setschedparam.c + * + * Copyright (C) 2007, 2008, 2012 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <sys/types.h> +#include <pthread.h> +#include <sched.h> +#include <errno.h> +#include <debug.h> + +#include "pthread_internal.h" + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Type Declarations + ****************************************************************************/ + +/**************************************************************************** + * Global Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: pthread_setschedparam + * + * Description: + * The pthread_setschedparam() functions will set the scheduling policy + * and parameters of threads. For SCHED_FIFO and SCHED_RR, the only + * required member of the sched_param structure is the priority + * sched_priority. + * + * The pthread_setschedparam() function will set the scheduling policy + * and associated scheduling parameters for the thread whose thread ID + * is given by 'thread' to the policy and associated parameters provided + * in 'policy' and 'param', respectively. + * + * The policy parameter may have the value SCHED_FIFO, or SCHED_RR + * (SCHED_OTHER and SCHED_SPORADIC, in particular, are not supported). + * The SCHED_FIFO and SCHED_RR policies will have a single scheduling + * parameter, sched_priority. + * + * If the pthread_setschedparam() function fails, the scheduling parameters + * will not be changed for the target thread. + * + * Parameters: + * thread - The ID of thread whose scheduling parameters will be modified. + * policy - The new scheduling policy of the thread. Either SCHED_FIFO or + * SCHED_RR. SCHED_OTHER and SCHED_SPORADIC are not supported. + * param - Provides the new priority of the thread. + * + * Return Value: + * 0 if successful. Otherwise, an error code identifying the cause of the + * failure: + * + * EINVAL The value specified by 'policy' or one of the scheduling + * parameters associated with the scheduling policy 'policy' is + * invalid. + * ENOTSUP An attempt was made to set the policy or scheduling parameters + * to an unsupported value (SCHED_OTHER and SCHED_SPORADIC in + * particular are not supported) + * EPERM The caller does not have the appropriate permission to set either + * the scheduling parameters or the scheduling policy of the + * specified thread. Or, the implementation does not allow the + * application to modify one of the parameters to the value + * specified. + * ESRCH The value specified by thread does not refer to a existing thread. + * + * Assumptions: + * + ****************************************************************************/ + +int pthread_setschedparam(pthread_t thread, int policy, FAR const struct sched_param *param) +{ + int ret; + + sdbg("thread ID=%d policy=%d param=0x%p\n", thread, policy, param); + + /* Set the errno to some non-zero value (failsafe) */ + + set_errno(EINVAL); + + /* Let sched_setscheduler do all of the work */ + + ret = sched_setscheduler((pid_t)thread, policy, param); + if (ret != OK) + { + /* If sched_setscheduler() fails, return the errno */ + + ret = get_errno(); + } + + return ret; +} |