1 | /* |
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2 | * Copyright (c) 2016 embedded brains GmbH |
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3 | * |
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4 | * The license and distribution terms for this file may be |
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5 | * found in the file LICENSE in this distribution or at |
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6 | * http://www.rtems.org/license/LICENSE. |
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7 | */ |
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8 | |
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9 | #if HAVE_CONFIG_H |
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10 | #include "config.h" |
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11 | #endif |
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12 | |
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13 | #include <pthread.h> |
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14 | #include <errno.h> |
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15 | |
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16 | #include <rtems/posix/priorityimpl.h> |
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17 | #include <rtems/posix/threadsup.h> |
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18 | #include <rtems/score/threadimpl.h> |
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19 | |
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20 | typedef struct { |
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21 | int prio; |
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22 | int error; |
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23 | } POSIX_Set_sched_prio_context; |
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24 | |
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25 | static bool _POSIX_Set_sched_prio_filter( |
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26 | Thread_Control *the_thread, |
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27 | Priority_Control *new_priority_p, |
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28 | void *arg |
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29 | ) |
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30 | { |
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31 | POSIX_Set_sched_prio_context *context; |
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32 | int prio; |
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33 | POSIX_API_Control *api; |
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34 | Priority_Control current_priority; |
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35 | Priority_Control new_priority; |
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36 | |
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37 | context = arg; |
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38 | prio = context->prio; |
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39 | |
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40 | if ( !_POSIX_Priority_Is_valid( prio ) ) { |
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41 | context->error = EINVAL; |
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42 | return false; |
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43 | } |
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44 | |
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45 | new_priority = _POSIX_Priority_To_core( prio ); |
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46 | *new_priority_p = new_priority; |
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47 | |
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48 | current_priority = the_thread->current_priority; |
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49 | the_thread->real_priority = new_priority; |
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50 | |
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51 | api = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
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52 | |
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53 | api->Sporadic.high_priority = new_priority; |
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54 | |
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55 | if ( api->Sporadic.low_priority < new_priority ) { |
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56 | api->Sporadic.low_priority = new_priority; |
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57 | } |
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58 | |
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59 | context->error = 0; |
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60 | return _Thread_Priority_less_than( current_priority, new_priority ) |
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61 | || !_Thread_Owns_resources( the_thread ); |
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62 | } |
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63 | |
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64 | int pthread_setschedprio( pthread_t thread, int prio ) |
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65 | { |
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66 | Thread_Control *the_thread; |
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67 | Per_CPU_Control *cpu_self; |
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68 | POSIX_Set_sched_prio_context context; |
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69 | ISR_lock_Context lock_context; |
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70 | |
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71 | context.prio = prio; |
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72 | |
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73 | the_thread = _Thread_Get( thread, &lock_context ); |
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74 | |
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75 | if ( the_thread == NULL ) { |
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76 | return ESRCH; |
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77 | } |
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78 | |
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79 | cpu_self = _Thread_Dispatch_disable_critical( &lock_context ); |
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80 | _ISR_lock_ISR_enable( &lock_context ); |
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81 | |
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82 | _Thread_Change_priority( |
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83 | the_thread, |
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84 | 0, |
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85 | &context, |
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86 | _POSIX_Set_sched_prio_filter, |
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87 | true |
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88 | ); |
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89 | |
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90 | _Thread_Dispatch_enable( cpu_self ); |
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91 | return context.error; |
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92 | } |
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