posix/src/pthreadgetattrnp.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup POSIXAPI
0007  *
0008  * @brief Pthread Get Attribute
0009  */
0010
0011 /*
0012  *  COPYRIGHT (c) 2014.
0013  *  On-Line Applications Research Corporation (OAR).
0014  *
0015  * Redistribution and use in source and binary forms, with or without
0016  * modification, are permitted provided that the following conditions
0017  * are met:
0018  * 1. Redistributions of source code must retain the above copyright
0019  *    notice, this list of conditions and the following disclaimer.
0020  * 2. Redistributions in binary form must reproduce the above copyright
0021  *    notice, this list of conditions and the following disclaimer in the
0022  *    documentation and/or other materials provided with the distribution.
0023  *
0024  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0025  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0026  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0027  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0028  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0029  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0030  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0031  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0032  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0033  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0034  * POSSIBILITY OF SUCH DAMAGE.
0035  */
0036
0037 #define  _GNU_SOURCE
0038
0039 #ifdef HAVE_CONFIG_H
0040 #include "config.h"
0041 #endif
0042
0043 #include <pthread.h>
0044 #include <errno.h>
0045 #include <string.h>
0046
0047 #include <rtems/posix/pthreadimpl.h>
0048 #include <rtems/posix/posixapi.h>
0049 #include <rtems/posix/pthreadattrimpl.h>
0050 #include <rtems/posix/priorityimpl.h>
0051 #include <rtems/score/schedulerimpl.h>
0052 #include <rtems/score/threadimpl.h>
0053
0054 int pthread_getattr_np(
0055   pthread_t       thread,
0056   pthread_attr_t *attr
0057 )
0058 {
0059   Thread_Control                     *the_thread;
0060   ISR_lock_Context                    lock_context;
0061   const Thread_CPU_budget_operations *cpu_budget_operations;
0062   const Scheduler_Control            *scheduler;
0063   Priority_Control                    priority;
0064   Status_Control                      status;
0065
0066   if ( attr == NULL ) {
0067     return EINVAL;
0068   }
0069
0070   attr = memset( attr, 0, sizeof( *attr ) );
0071
0072   the_thread = _Thread_Get( thread, &lock_context );
0073
0074   if ( the_thread == NULL ) {
0075     return ESRCH;
0076   }
0077
0078   _Thread_State_acquire_critical( the_thread, &lock_context );
0079
0080   attr->stackaddr = the_thread->Start.Initial_stack.area;
0081   attr->stacksize = the_thread->Start.Initial_stack.size;
0082
0083   if ( the_thread->was_created_with_inherited_scheduler ) {
0084     attr->inheritsched = PTHREAD_INHERIT_SCHED;
0085   } else {
0086     attr->inheritsched = PTHREAD_EXPLICIT_SCHED;
0087   }
0088
0089   scheduler = _Thread_Scheduler_get_home( the_thread );
0090   _POSIX_Threads_Get_sched_param_sporadic(
0091     the_thread,
0092     scheduler,
0093     &attr->schedparam
0094   );
0095   priority = the_thread->Real_priority.priority;
0096
0097   if ( _Thread_Is_joinable( the_thread ) ) {
0098     attr->detachstate = PTHREAD_CREATE_JOINABLE;
0099   } else {
0100     attr->detachstate = PTHREAD_CREATE_DETACHED;
0101   }
0102
0103   attr->affinityset = &attr->affinitysetpreallocated;
0104   attr->affinitysetsize = sizeof( attr->affinitysetpreallocated );
0105   status = _Scheduler_Get_affinity(
0106     the_thread,
0107     attr->affinitysetsize,
0108     attr->affinityset
0109   );
0110
0111   cpu_budget_operations = the_thread->CPU_budget.operations;
0112
0113   _Thread_State_release( the_thread, &lock_context );
0114
0115   attr->is_initialized = true;
0116   attr->contentionscope = PTHREAD_SCOPE_PROCESS;
0117   attr->cputime_clock_allowed = 1;
0118   attr->schedparam.sched_priority = _POSIX_Priority_From_core(
0119     scheduler,
0120     priority
0121   );
0122   attr->schedpolicy =
0123     _POSIX_Thread_Translate_to_sched_policy( cpu_budget_operations );
0124
0125   return _POSIX_Get_error( status );
0126 }