1# context.h 2 3 4## Overview 5 6Provides **Context** APIs for configuring runtime information. 7 8**Since** 9 109 11 12**Related Modules** 13 14[MindSpore](_mind_spore.md) 15 16 17## Summary 18 19 20### Types 21 22| Name| Description| 23| -------- | -------- | 24| [OH_AI_ContextHandle](_mind_spore.md#oh_ai_contexthandle) | Defines the pointer to the MindSpore context. | 25| [OH_AI_DeviceInfoHandle](_mind_spore.md#oh_ai_deviceinfohandle) | Defines the pointer to the MindSpore device information.| 26 27 28### Functions 29 30| Name| Description| 31| -------- | -------- | 32| [OH_AI_ContextCreate](_mind_spore.md#oh_ai_contextcreate) () | Creates a context object.| 33| [OH_AI_ContextDestroy](_mind_spore.md#oh_ai_contextdestroy) (OH_AI_ContextHandle \*context) | Destroys a context object.| 34| [OH_AI_ContextSetThreadNum](_mind_spore.md#oh_ai_contextsetthreadnum) (OH_AI_ContextHandle context, int32_t thread_num) | Sets the number of runtime threads.| 35| [OH_AI_ContextGetThreadNum](_mind_spore.md#oh_ai_contextgetthreadnum) (const OH_AI_ContextHandle context) | Obtains the number of threads.| 36| [OH_AI_ContextSetThreadAffinityMode](_mind_spore.md#oh_ai_contextsetthreadaffinitymode) (OH_AI_ContextHandle context, int mode) | Sets the affinity mode for binding runtime threads to CPU cores, which are classified into large, medium, and small cores based on the CPU frequency. You only need to bind the large or medium cores, but not small cores.| 37| [OH_AI_ContextGetThreadAffinityMode](_mind_spore.md#oh_ai_contextgetthreadaffinitymode) (const OH_AI_ContextHandle context) | Obtains the affinity mode for binding runtime threads to CPU cores.| 38| [OH_AI_ContextSetThreadAffinityCoreList](_mind_spore.md#oh_ai_contextsetthreadaffinitycorelist) (OH_AI_ContextHandle context, const int32_t \*core_list, size_t core_num) | Sets the list of CPU cores bound to a runtime thread.| 39| [OH_AI_ContextGetThreadAffinityCoreList](_mind_spore.md#oh_ai_contextgetthreadaffinitycorelist) (const OH_AI_ContextHandle context, size_t \*core_num) | Obtains the list of bound CPU cores.| 40| [OH_AI_ContextSetEnableParallel](_mind_spore.md#oh_ai_contextsetenableparallel) (OH_AI_ContextHandle context, bool is_parallel) | Sets whether to enable parallelism between operators. The setting is ineffective because the feature of this API is not yet available.| 41| [OH_AI_ContextGetEnableParallel](_mind_spore.md#oh_ai_contextgetenableparallel) (const OH_AI_ContextHandle context) | Checks whether parallelism between operators is supported.| 42| [OH_AI_ContextAddDeviceInfo](_mind_spore.md#oh_ai_contextadddeviceinfo) (OH_AI_ContextHandle context, OH_AI_DeviceInfoHandle device_info) | Attaches the custom device information to the inference context.| 43| [OH_AI_DeviceInfoCreate](_mind_spore.md#oh_ai_deviceinfocreate) (OH_AI_DeviceType device_type) | Creates a device information object.| 44| [OH_AI_DeviceInfoDestroy](_mind_spore.md#oh_ai_deviceinfodestroy) (OH_AI_DeviceInfoHandle \*device_info) | Destroys a device information object. Note: After the device information instance is added to the context, the caller does not need to destroy it manually.| 45| [OH_AI_DeviceInfoSetProvider](_mind_spore.md#oh_ai_deviceinfosetprovider) (OH_AI_DeviceInfoHandle device_info, const char \*provider) | Sets the provider name.| 46| [OH_AI_DeviceInfoGetProvider](_mind_spore.md#oh_ai_deviceinfogetprovider) (const OH_AI_DeviceInfoHandle device_info) | Obtains the provider name.| 47| [OH_AI_DeviceInfoSetProviderDevice](_mind_spore.md#oh_ai_deviceinfosetproviderdevice) (OH_AI_DeviceInfoHandle device_info, const char \*device) | Sets the name of a provider device.| 48| [OH_AI_DeviceInfoGetProviderDevice](_mind_spore.md#oh_ai_deviceinfogetproviderdevice) (const OH_AI_DeviceInfoHandle device_info) | Obtains the name of a provider device.| 49| [OH_AI_DeviceInfoGetDeviceType](_mind_spore.md#oh_ai_deviceinfogetdevicetype) (const OH_AI_DeviceInfoHandle device_info) | Obtains the device type.| 50| [OH_AI_DeviceInfoSetEnableFP16](_mind_spore.md#oh_ai_deviceinfosetenablefp16) (OH_AI_DeviceInfoHandle device_info, bool is_fp16) | Sets whether to enable float16 inference. This function is available only for CPU and GPU devices.| 51| [OH_AI_DeviceInfoGetEnableFP16](_mind_spore.md#oh_ai_deviceinfogetenablefp16) (const OH_AI_DeviceInfoHandle device_info) | Checks whether float16 inference is enabled. This function is available only for CPU and GPU devices.| 52| [OH_AI_DeviceInfoSetFrequency](_mind_spore.md#oh_ai_deviceinfosetfrequency) (OH_AI_DeviceInfoHandle device_info, int frequency) | Sets the NPU frequency type. This function is available only for NPU devices.| 53| [OH_AI_DeviceInfoGetFrequency](_mind_spore.md#oh_ai_deviceinfogetfrequency) (const OH_AI_DeviceInfoHandle device_info) | Obtains the NPU frequency type. This function is available only for NPU devices.| 54