1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Wait For The Barrier |
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5 | * @ingroup RTEMSScoreBarrier |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2006. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <rtems/score/corebarrierimpl.h> |
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22 | #include <rtems/score/statesimpl.h> |
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23 | #include <rtems/score/threadimpl.h> |
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24 | |
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25 | Status_Control _CORE_barrier_Seize( |
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26 | CORE_barrier_Control *the_barrier, |
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27 | Thread_Control *executing, |
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28 | bool wait, |
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29 | Thread_queue_Context *queue_context |
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30 | ) |
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31 | { |
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32 | uint32_t number_of_waiting_threads; |
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33 | |
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34 | _CORE_barrier_Acquire_critical( the_barrier, queue_context ); |
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35 | |
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36 | number_of_waiting_threads = the_barrier->number_of_waiting_threads; |
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37 | ++number_of_waiting_threads; |
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38 | |
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39 | if ( |
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40 | _CORE_barrier_Is_automatic( &the_barrier->Attributes ) |
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41 | && number_of_waiting_threads == the_barrier->Attributes.maximum_count |
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42 | ) { |
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43 | _CORE_barrier_Surrender( the_barrier, queue_context ); |
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44 | return STATUS_BARRIER_AUTOMATICALLY_RELEASED; |
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45 | } else { |
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46 | the_barrier->number_of_waiting_threads = number_of_waiting_threads; |
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47 | _Thread_queue_Context_set_thread_state( |
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48 | queue_context, |
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49 | STATES_WAITING_FOR_BARRIER |
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50 | ); |
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51 | _Thread_queue_Enqueue( |
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52 | &the_barrier->Wait_queue.Queue, |
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53 | CORE_BARRIER_TQ_OPERATIONS, |
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54 | executing, |
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55 | queue_context |
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56 | ); |
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57 | return _Thread_Wait_get_status( executing ); |
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58 | } |
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59 | } |
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