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annotate DPF-Prymula-audioplugins/dpf/distrho/src/lv2/lv2_rtmempool.h @ 3:84e66ea83026

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DPF-Prymula-audioplugins-0.231015-2
author prymula <prymula76@outlook.com>
date Mon, 16 Oct 2023 21:53:34 +0200
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1 /*
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2 LV2 realtime safe memory pool extension definition
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3 This work is in public domain.
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4
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5 This file is distributed in the hope that it will be useful,
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6 but WITHOUT ANY WARRANTY; without even the implied warranty of
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7 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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8
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9 If you have questions, contact Filipe Coelho (aka falkTX) <falktx@falktx.com>
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10 or ask in #lad channel, FreeNode IRC network.
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11 */
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12
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13 /**
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14 * @file lv2_rtmempool.h
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15 * C header for the LV2 rtmempool extension <http://kxstudio.sf.net/ns/lv2ext/rtmempool>.
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16 *
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17 */
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18
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19 #ifndef LV2_RTMEMPOOL_H
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20 #define LV2_RTMEMPOOL_H
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21
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22 #define LV2_RTSAFE_MEMORY_POOL_URI "http://kxstudio.sf.net/ns/lv2ext/rtmempool"
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23 #define LV2_RTSAFE_MEMORY_POOL_PREFIX LV2_RTSAFE_MEMORY_POOL_URI "#"
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24
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25 #define LV2_RTSAFE_MEMORY_POOL__Pool LV2_RTSAFE_MEMORY_POOL_URI "Pool"
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26
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27 /** max size of memory pool name, in chars, including terminating zero char */
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28 #define LV2_RTSAFE_MEMORY_POOL_NAME_MAX 128
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29
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30 /** This extension used to be defined by a different URI */
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31 #define LV2_RTSAFE_MEMORY_POOL_DEPRECATED_URI "http://home.gna.org/lv2dynparam/rtmempool/v1"
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32
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33 #ifdef __cplusplus
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34 extern "C" {
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35 #else
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36 #include <stdbool.h>
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37 #endif
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38
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39 /**
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40 * Opaque data to host data for LV2_RtMemPool_Pool.
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41 */
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42 typedef void* LV2_RtMemPool_Handle;
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43
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44 /**
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45 * On instantiation, host must supply LV2_RTSAFE_MEMORY_POOL__Pool feature.
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46 * LV2_Feature::data must be pointer to LV2_RtMemPool_Pool.
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47 */
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48 typedef struct _LV2_RtMemPool_Pool {
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49 /**
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50 * This function is called when plugin wants to create memory pool
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51 *
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52 * <b>may/will sleep</b>
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53 *
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54 * @param pool_name pool name, for debug purposes, max RTSAFE_MEMORY_POOL_NAME_MAX chars, including terminating zero char. May be NULL.
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55 * @param data_size memory chunk size
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56 * @param min_preallocated min chunks preallocated
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57 * @param max_preallocated max chunks preallocated
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58 *
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59 * @return Success status, true if successful
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60 */
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61 bool (*create)(LV2_RtMemPool_Handle * handle_ptr,
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62 const char * pool_name,
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63 size_t data_size,
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64 size_t min_preallocated,
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65 size_t max_preallocated);
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66
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67 /**
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68 * This function is called when plugin wants to destroy previously created memory pool
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69 *
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70 * <b>may/will sleep</b>
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71 */
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72 void (*destroy)(LV2_RtMemPool_Handle handle);
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73
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74 /**
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75 * This function is called when plugin wants to allocate memory in context where sleeping is not allowed
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76 *
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77 * <b>will not sleep</b>
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78 *
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79 * @return Pointer to allocated memory or NULL if memory no memory is available
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80 */
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81 void * (*allocate_atomic)(LV2_RtMemPool_Handle handle);
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82
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83 /**
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84 * This function is called when plugin wants to allocate memory in context where sleeping is allowed
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85 *
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86 * <b>may/will sleep</b>
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87 *
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88 * @return Pointer to allocated memory or NULL if memory no memory is available (should not happen under normal conditions)
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89 */
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90 void * (*allocate_sleepy)(LV2_RtMemPool_Handle handle);
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91
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92 /**
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93 * This function is called when plugin wants to deallocate previously allocated memory
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94 *
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95 * <b>will not sleep</b>
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96 *
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97 * @param memory_ptr pointer to previously allocated memory chunk
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98 */
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99 void (*deallocate)(LV2_RtMemPool_Handle handle,
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100 void * memory_ptr);
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101
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102 } LV2_RtMemPool_Pool;
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103
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104 /**
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105 * Deprecated feature for backwards compatibility.
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106 */
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107 typedef struct _LV2_RtMemPool_Pool_Deprecated {
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108 unsigned char (*create)(const char*,size_t,size_t,size_t,LV2_RtMemPool_Handle*);
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109 void (*destroy)(LV2_RtMemPool_Handle);
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110 void* (*allocate_atomic)(LV2_RtMemPool_Handle);
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111 void* (*allocate_sleepy)(LV2_RtMemPool_Handle);
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112 void (*deallocate)(LV2_RtMemPool_Handle,void*);
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113 } LV2_RtMemPool_Pool_Deprecated;
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114
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115 #ifdef __cplusplus
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116 } /* extern "C" */
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117 #endif
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118
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119 #endif /* LV2_RTMEMPOOL_H */