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Diffstat (limited to 'nuttx/sched/pthread_getschedparam.c')
-rw-r--r-- | nuttx/sched/pthread_getschedparam.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/nuttx/sched/pthread_getschedparam.c b/nuttx/sched/pthread_getschedparam.c new file mode 100644 index 000000000..c376fd400 --- /dev/null +++ b/nuttx/sched/pthread_getschedparam.c @@ -0,0 +1,139 @@ +/**************************************************************************** + * pthread_getschedparam.c + * + * Copyright (C) 2007, 2008 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_getschedparam + * + * Description: + * The pthread_getschedparam() functions will get 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_getschedparam() function will retrieve the scheduling + * policy and scheduling parameters for the thread whose thread ID is + * given by 'thread' and will store those values in 'policy' and 'param', + * respectively. The priority value returned from pthread_getschedparam() + * will be the value specified by the most recent pthread_setschedparam(), + * pthread_setschedprio(), or pthread_create() call affecting the target + * thread. It will not reflect any temporary adjustments to its priority + * (such as might result of any priority inheritance, for example). + * + * 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. +* + * Parameters: + * thread - The ID of thread whose scheduling parameters will be queried. + * policy - The location to store the thread's scheduling policy. + * param - The location to store the thread's priority. + * + * Return Value: + * 0 if successful. Otherwise, the error code ESRCH if the value specified + * by thread does not refer to an existing thread. + * + * Assumptions: + * + ****************************************************************************/ + +int pthread_getschedparam(pthread_t thread, FAR int *policy, + FAR struct sched_param *param) +{ + int ret; + + sdbg("Thread ID=%d policy=0x%p param=0x%p\n", thread, policy, param); + + if (!policy || !param) + { + ret = EINVAL; + } + else + { + /* Get the schedparams of the thread. */ + + ret = sched_getparam((pid_t)thread, param); + if (ret != OK) + { + ret = EINVAL; + } + + /* Return the policy. */ + + *policy = sched_getscheduler((pid_t)thread); + if (*policy == ERROR) + { + ret = get_errno(); + } + } + + sdbg("Returning %d\n", ret); + return ret; +} + |