1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief POSIX Asynchronous Input and Output Private Support |
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5 | * |
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6 | * This defines private information for the AIO implementation. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright 2010, Alin Rus <alin.codejunkie@gmail.com> |
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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 | #ifndef _AIO_MISC_H |
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18 | #define _AIO_MISC_H |
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19 | |
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20 | #include <stdio.h> |
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21 | #include <string.h> |
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22 | #include <aio.h> |
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23 | #include <pthread.h> |
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24 | #include <rtems.h> |
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25 | #include <rtems/chain.h> |
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26 | #include <rtems/system.h> |
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27 | #include <rtems/seterr.h> |
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28 | |
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29 | #ifdef __cplusplus |
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30 | extern "C" |
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31 | { |
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32 | #endif |
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33 | |
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34 | /* Actual request being processed */ |
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35 | typedef struct |
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36 | { |
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37 | rtems_chain_node next_prio; /* chain requests in order of priority */ |
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38 | int policy; /* If _POSIX_PRIORITIZED_IO and |
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39 | _POSIX_PRIORITY_SCHEDULING are defined */ |
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40 | int priority; /* see above */ |
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41 | pthread_t caller_thread; /* used for notification */ |
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42 | struct aiocb *aiocbp; /* aio control block */ |
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43 | } rtems_aio_request; |
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44 | |
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45 | typedef struct |
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46 | { |
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47 | rtems_chain_node next_fd; /* order fd chains in queue */ |
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48 | rtems_chain_control perfd; /* chain of requests for this fd */ |
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49 | int fildes; /* file descriptor to be processed */ |
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50 | int new_fd; /* if this is a newly created chain */ |
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51 | pthread_mutex_t mutex; |
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52 | pthread_cond_t cond; |
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53 | |
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54 | } rtems_aio_request_chain; |
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55 | |
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56 | typedef struct |
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57 | { |
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58 | pthread_mutex_t mutex; |
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59 | pthread_cond_t new_req; |
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60 | pthread_attr_t attr; |
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61 | |
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62 | rtems_chain_control work_req; /* chains being worked by active threads */ |
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63 | rtems_chain_control idle_req; /* fd chains waiting to be processed */ |
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64 | unsigned int initialized; /* specific value if queue is initialized */ |
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65 | int active_threads; /* the number of active threads */ |
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66 | int idle_threads; /* number of idle threads */ |
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67 | |
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68 | } rtems_aio_queue; |
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69 | |
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70 | extern rtems_aio_queue aio_request_queue; |
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71 | |
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72 | #define AIO_QUEUE_INITIALIZED 0xB00B |
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73 | |
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74 | #ifndef AIO_MAX_THREADS |
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75 | #define AIO_MAX_THREADS 5 |
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76 | #endif |
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77 | |
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78 | #ifndef AIO_MAX_QUEUE_SIZE |
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79 | #define AIO_MAX_QUEUE_SIZE 30 |
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80 | #endif |
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81 | |
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82 | int rtems_aio_init (void); |
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83 | int rtems_aio_enqueue (rtems_aio_request *req); |
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84 | rtems_aio_request_chain *rtems_aio_search_fd |
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85 | ( |
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86 | rtems_chain_control *chain, |
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87 | int fildes, |
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88 | int create |
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89 | ); |
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90 | void rtems_aio_remove_fd (rtems_aio_request_chain *r_chain); |
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91 | int rtems_aio_remove_req (rtems_chain_control *chain, |
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92 | struct aiocb *aiocbp); |
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93 | |
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94 | #ifdef RTEMS_DEBUG |
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95 | #include <assert.h> |
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96 | |
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97 | #define AIO_assert(_x) assert(_x) |
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98 | #define AIO_printf(_x) printf(_x) |
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99 | #else |
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100 | #define AIO_assert(_x) |
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101 | #define AIO_printf(_x) |
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102 | #endif |
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103 | |
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104 | #define rtems_aio_set_errno_return_minus_one( _error, _aiocbp ) \ |
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105 | do { (_aiocbp)->error_code = (_error); \ |
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106 | (_aiocbp)->return_value = -1; \ |
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107 | rtems_set_errno_and_return_minus_one (_error);} while(0) |
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108 | |
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109 | #ifdef __cplusplus |
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110 | } |
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111 | #endif |
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112 | |
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113 | #endif |
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