1 | /* |
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2 | * $Id$ |
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3 | */ |
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4 | |
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5 | #include <assert.h> |
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6 | #include <errno.h> |
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7 | #include <pthread.h> |
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8 | |
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9 | #include <rtems/system.h> |
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10 | #include <rtems/score/coremutex.h> |
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11 | #include <rtems/score/watchdog.h> |
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12 | #if defined(RTEMS_MULTIPROCESSING) |
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13 | #include <rtems/score/mpci.h> |
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14 | #endif |
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15 | #include <rtems/posix/mutex.h> |
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16 | #include <rtems/posix/priority.h> |
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17 | #include <rtems/posix/time.h> |
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18 | |
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19 | /*PAGE |
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20 | * |
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21 | * 13.6.2 Change the Priority Ceiling of a Mutex, P1003.1c/Draft 10, p. 131 |
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22 | */ |
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23 | |
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24 | int pthread_mutex_setprioceiling( |
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25 | pthread_mutex_t *mutex, |
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26 | int prioceiling, |
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27 | int *old_ceiling |
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28 | ) |
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29 | { |
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30 | register POSIX_Mutex_Control *the_mutex; |
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31 | Objects_Locations location; |
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32 | Priority_Control the_priority; |
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33 | int status; |
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34 | |
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35 | if ( !old_ceiling ) |
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36 | return EINVAL; |
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37 | |
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38 | if ( !_POSIX_Priority_Is_valid( prioceiling ) ) |
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39 | return EINVAL; |
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40 | |
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41 | the_priority = _POSIX_Priority_To_core( prioceiling ); |
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42 | |
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43 | /* |
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44 | * Must acquire the mutex before we can change it's ceiling |
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45 | */ |
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46 | |
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47 | status = pthread_mutex_lock( mutex ); |
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48 | if ( status ) |
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49 | return status; |
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50 | |
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51 | the_mutex = _POSIX_Mutex_Get( mutex, &location ); |
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52 | switch ( location ) { |
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53 | case OBJECTS_REMOTE: |
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54 | #if defined(RTEMS_MULTIPROCESSING) |
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55 | /* XXX It feels questionable to set the ceiling on a remote mutex. */ |
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56 | return EINVAL; |
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57 | #endif |
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58 | case OBJECTS_ERROR: |
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59 | return EINVAL; /* impossible to get here */ |
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60 | case OBJECTS_LOCAL: |
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61 | *old_ceiling = _POSIX_Priority_From_core( |
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62 | the_mutex->Mutex.Attributes.priority_ceiling |
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63 | ); |
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64 | the_mutex->Mutex.Attributes.priority_ceiling = the_priority; |
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65 | _CORE_mutex_Surrender( |
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66 | &the_mutex->Mutex, |
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67 | the_mutex->Object.id, |
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68 | #if defined(RTEMS_MULTIPROCESSING) |
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69 | POSIX_Threads_mutex_MP_support |
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70 | #else |
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71 | NULL |
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72 | #endif |
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73 | ); |
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74 | _Thread_Enable_dispatch(); |
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75 | return 0; |
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76 | } |
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77 | return POSIX_BOTTOM_REACHED(); |
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78 | } |
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