1 | /* |
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2 | * COPYRIGHT (c) 2010 Chris Johns <chrisj@rtems.org> |
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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.com/license/LICENSE. |
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7 | * |
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8 | * $Id$ |
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9 | */ |
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10 | /** |
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11 | * @file |
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12 | * |
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13 | * @ingroup rtems-rfs |
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14 | * |
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15 | * RTEMS File System Mutex. |
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16 | */ |
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17 | |
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18 | #if HAVE_CONFIG_H |
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19 | #include "config.h" |
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20 | #endif |
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21 | |
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22 | #include <rtems/rfs/rtems-rfs-mutex.h> |
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23 | |
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24 | #if __rtems__ |
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25 | /** |
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26 | * RTEMS_RFS Mutex Attributes |
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27 | * |
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28 | * @warning Do not configure as inherit priority. If a driver is in the driver |
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29 | * initialisation table this locked semaphore will have the IDLE task |
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30 | * as the holder and a blocking task will raise the priority of the |
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31 | * IDLE task which can cause unsual side effects like not work. |
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32 | */ |
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33 | #define RTEMS_RFS_MUTEX_ATTRIBS \ |
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34 | (RTEMS_PRIORITY | RTEMS_SIMPLE_BINARY_SEMAPHORE | \ |
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35 | RTEMS_NO_INHERIT_PRIORITY | RTEMS_NO_PRIORITY_CEILING | RTEMS_LOCAL) |
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36 | #endif |
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37 | |
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38 | int |
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39 | rtems_rfs_mutex_create (rtems_rfs_mutex* mutex) |
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40 | { |
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41 | #if __rtems__ |
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42 | rtems_status_code sc; |
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43 | sc = rtems_semaphore_create (rtems_build_name ('R', 'F', 'S', 'm'), |
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44 | 1, RTEMS_RFS_MUTEX_ATTRIBS, 0, |
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45 | mutex); |
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46 | if (sc != RTEMS_SUCCESSFUL) |
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47 | { |
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48 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_MUTEX)) |
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49 | printf ("rtems-rfs: mutex: open failed: %s\n", |
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50 | rtems_status_text (sc)); |
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51 | return EIO; |
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52 | } |
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53 | #endif |
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54 | return 0; |
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55 | } |
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56 | |
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57 | int |
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58 | rtems_rfs_mutex_destroy (rtems_rfs_mutex* mutex) |
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59 | { |
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60 | #if __rtems__ |
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61 | rtems_status_code sc; |
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62 | sc = rtems_semaphore_delete (*mutex); |
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63 | if (sc != RTEMS_SUCCESSFUL) |
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64 | { |
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65 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_MUTEX)) |
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66 | printf ("rtems-rfs: mutex: close failed: %s\n", |
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67 | rtems_status_text (sc)); |
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68 | return EIO; |
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69 | } |
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70 | #endif |
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71 | return 0; |
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72 | } |
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