1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Wait at a Spinlock |
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5 | * @ingroup POSIXAPI |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2007. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * Copyright (c) 2016 embedded brains GmbH |
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13 | * |
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14 | * The license and distribution terms for this file may be |
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15 | * found in the file LICENSE in this distribution or at |
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16 | * http://www.rtems.org/license/LICENSE. |
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17 | */ |
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18 | |
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19 | #if HAVE_CONFIG_H |
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20 | #include "config.h" |
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21 | #endif |
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22 | |
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23 | #include <rtems/posix/spinlockimpl.h> |
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24 | |
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25 | RTEMS_STATIC_ASSERT( |
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26 | #if defined(RTEMS_SMP) |
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27 | offsetof( POSIX_Spinlock_Control, Lock.next_ticket ) |
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28 | #else |
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29 | offsetof( POSIX_Spinlock_Control, reserved[ 0 ] ) |
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30 | #endif |
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31 | == offsetof( pthread_spinlock_t, _Lock._next_ticket ), |
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32 | POSIX_SPINLOCK_T_LOCK_NEXT_TICKET |
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33 | ); |
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34 | |
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35 | RTEMS_STATIC_ASSERT( |
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36 | #if defined(RTEMS_SMP) |
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37 | offsetof( POSIX_Spinlock_Control, Lock.now_serving ) |
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38 | #else |
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39 | offsetof( POSIX_Spinlock_Control, reserved[ 1 ] ) |
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40 | #endif |
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41 | == offsetof( pthread_spinlock_t, _Lock._now_serving ), |
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42 | POSIX_SPINLOCK_T_LOCK_NOW_SERVING |
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43 | ); |
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44 | |
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45 | RTEMS_STATIC_ASSERT( |
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46 | offsetof( POSIX_Spinlock_Control, interrupt_state ) |
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47 | == offsetof( pthread_spinlock_t, _interrupt_state ), |
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48 | POSIX_SPINLOCK_T_INTERRUPT_STATE |
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49 | ); |
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50 | |
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51 | RTEMS_STATIC_ASSERT( |
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52 | sizeof( POSIX_Spinlock_Control ) == sizeof( pthread_spinlock_t ), |
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53 | POSIX_SPINLOCK_T_SIZE |
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54 | ); |
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55 | |
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56 | int pthread_spin_lock( pthread_spinlock_t *spinlock ) |
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57 | { |
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58 | POSIX_Spinlock_Control *the_spinlock; |
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59 | ISR_Level level; |
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60 | #if defined(RTEMS_SMP) && defined(RTEMS_PROFILING) |
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61 | Per_CPU_Control *cpu_self; |
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62 | #endif |
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63 | |
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64 | the_spinlock = _POSIX_Spinlock_Get( spinlock ); |
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65 | _ISR_Local_disable( level ); |
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66 | #if defined(RTEMS_SMP) |
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67 | #if defined(RTEMS_PROFILING) |
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68 | /* The lock statistics are incorrect in case of nested pthread spinlocks */ |
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69 | cpu_self = _Per_CPU_Get(); |
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70 | #endif |
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71 | _SMP_ticket_lock_Acquire( |
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72 | &the_spinlock->Lock, |
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73 | &cpu_self->Lock_stats, |
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74 | &cpu_self->Lock_stats_context |
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75 | ); |
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76 | #endif |
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77 | the_spinlock->interrupt_state = level; |
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78 | return 0; |
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79 | } |
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80 | |
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81 | int pthread_spin_trylock( pthread_spinlock_t *spinlock ) |
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82 | RTEMS_ALIAS( pthread_spin_lock ); |
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