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Diffstat (limited to 'nuttx/sched/pthread_setschedprio.c')
-rw-r--r-- | nuttx/sched/pthread_setschedprio.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/nuttx/sched/pthread_setschedprio.c b/nuttx/sched/pthread_setschedprio.c new file mode 100644 index 000000000..a523b20ea --- /dev/null +++ b/nuttx/sched/pthread_setschedprio.c @@ -0,0 +1,120 @@ +/**************************************************************************** + * pthread_schedsetprio.c + * + * Copyright (C) 2007, 2009 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 <nuttx/config.h> +#include <sys/types.h> +#include <sched.h> +#include <errno.h> +#include <nuttx/arch.h> +#include "os_internal.h" + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Type Declarations + ****************************************************************************/ + +/**************************************************************************** + * Global Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: pthread_setsetprio + * + * Description: + * The pthread_setschedprio() function sets the scheduling priority for the + * thread whose thread ID is given by 'thread' to the value given by 'prio'. + * If the thread_setschedprio() function fails, the scheduling priority + * of the target thread will not be changed. + * + * Inputs: + * thread - the thread ID of the task to reprioritize. + * prio - The new thread priority. The range of valid priority numbers is + * from SCHED_PRIORITY_MIN through SCHED_PRIORITY_MAX. + * + * Return Value: + * OK if successful, otherwise an error number. This function can + * fail for the following reasons: + * + * EINVAL - prio is out of range. + * ESRCH - thread ID does not correspond to any thread. + * + * Assumptions: + * + ****************************************************************************/ + +int pthread_setschedprio(pthread_t thread, int prio) +{ + struct sched_param param; + int ret; + + /* Set the errno to some non-zero value (failsafe) */ + + errno = EINVAL; + + /* Call sched_setparam() to change the priority */ + + param.sched_priority = prio; + ret = sched_setparam((pid_t)thread, ¶m); + if (ret != OK) + { + /* If sched_setparam() fails, return the errno */ + + ret = errno; + } + return ret; +} |