# AtomicSafetyHandle > Coordinate safe access to native container memory inside the job system. ## Definition * **Type:** Struct * **Namespace:** [Unity.Collections.LowLevel.Unsafe](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe.md) * **Assembly:** UnityEngine.CoreModule ```csharp public struct AtomicSafetyHandle ``` ## Remarks `AtomicSafetyHandle` holds a reference to the central information that the safety system stores for a given native container. When a job contains a `NativeContainer` instance, the job system automatically configures the flags in `AtomicSafetyHandle` to reflect the way that the native container can be used in that job. Each job has a separate `AtomicSafetyHandle` instance for a given native container. Use this class when you implement a custom `NativeContainer` type. Every `NativeContainer` instance must contain an `AtomicSafetyHandle` field named `m_Safety`. For a conceptual overview of AtomicSafetyHandle and the role it plays in the job system, refer to [Implement a custom native container](/engine/6000.6/manual/scripting/optimization/job-system/thread-safe-types/custom-nativecontainer.md). ## Static Methods | Method | Description | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [CheckDeallocateAndThrow](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/checkdeallocateandthrow.md) | Check if an AtomicSafetyHandle can be deallocated. | | [CheckExistsAndThrow](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/checkexistsandthrow.md) | Check if an AtomicSafetyHandle is valid. | | [CheckGetSecondaryDataPointerAndThrow](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/checkgetsecondarydatapointerandthrow.md) | Check whether it's safe to create a memory-aliasing view to a native container. | | [CheckReadAndThrow](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/checkreadandthrow.md) | Check whether the referenced native container can be read from. | | [CheckWriteAndBumpSecondaryVersion](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/checkwriteandbumpsecondaryversion.md) | Check whether the referenced native container can be written to and increment the secondary version number if so. | | [CheckWriteAndThrow](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/checkwriteandthrow.md) | Check whether the referenced native container can be written to. | | [Create](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/create.md) | Creates a new AtomicSafetyHandle. | | [EnforceAllBufferJobsHaveCompleted](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/enforceallbufferjobshavecompleted.md) | Waits for all jobs running against the [AtomicSafetyHandle](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle.md) to complete. | | [EnforceAllBufferJobsHaveCompletedAndDisableReadWrite](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/enforceallbufferjobshavecompletedanddisablereadwrite.md) | Waits for all jobs running against an [AtomicSafetyHandle](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle.md) to complete and then disables the read and write access on the AtomicSafetyHandle. | | [EnforceAllBufferJobsHaveCompletedAndRelease](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/enforceallbufferjobshavecompletedandrelease.md) | Waits for all jobs running against an [AtomicSafetyHandle](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle.md) to complete and then releases the AtomicSafetyHandle. | | [GetAllowReadOrWriteAccess](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/getallowreadorwriteaccess.md) | Checks if the [AtomicSafetyHandle](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle.md) is configured to allow reading or writing. | | [GetNestedContainer](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/getnestedcontainer.md) | Checks whether an AtomicSafetyHandle represents a nested container. | | [GetReaderArray](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/getreaderarray.md) | Fetches the job handles of all jobs that read from an AtomicSafetyHandle. | | [GetReaderName](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/getreadername.md) | Gets the name of a specified job that reads from an AtomicSafetyHandle. | | [GetTempMemoryHandle](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/gettempmemoryhandle.md) | Gets an AtomicSafetyHandle for the temporary memory allocations in a temporary memory scope. | | [GetTempUnsafePtrSliceHandle](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/gettempunsafeptrslicehandle.md) | Gets a single shared AtomicSafetyHandle. | | [GetWriter](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/getwriter.md) | Gets any writers on an AtomicSafetyHandle. | | [GetWriterName](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/getwritername.md) | Gets the debug name of the current writer on an AtomicSafetyHandle. | | [IsDefaultValue](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/isdefaultvalue.md) | Checks if an AtomicSafetyHandle has its default value. | | [IsHandleValid](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/ishandlevalid.md) | Checks if an AtomicSafetyHandle is valid. | | [IsTempMemoryHandle](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/istempmemoryhandle.md) | Checks if an AtomicSafetyHandle is the temporary memory safety handle for the active temporary memory scope. | | [IsValidNonDefaultHandle](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/isvalidnondefaulthandle.md) | Checks if an AtomicSafetyHandle has been initialized and is valid. | | [NewStaticSafetyId](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/newstaticsafetyid.md) | Allocates a new static safety ID to store information for the provided type. | | [PrepareUndisposable](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/prepareundisposable.md) | Marks an AtomicSafetyHandle so that it can't be disposed of. | | [Release](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/release.md) | Releases a previously created AtomicSafetyHandle. | | [SetAllowReadOrWriteAccess](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/setallowreadorwriteaccess.md) | Sets the read or write access on an AtomicSafetyHandle. | | [SetAllowSecondaryVersionWriting](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/setallowsecondaryversionwriting.md) | Sets whether other AtomicSafetyHandles that use a secondary version number can write to the NativeContainer protected by a given AtomicSafetyHandle. | | [SetBumpSecondaryVersionOnScheduleWrite](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/setbumpsecondaryversiononschedulewrite.md) | Sets whether to automatically bump the secondary version when scheduling a job that has write access to the AtomicSafetyHandle. | | [SetCustomErrorMessage](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/setcustomerrormessage.md) | Provides a custom error message for a specific job debugger error type, in cases where additional context can be provided. | | [SetNestedContainer](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/setnestedcontainer.md) | Sets the nested container flag on an AtomicSafetyHandle. | | [SetStaticSafetyId](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/setstaticsafetyid.md) | Assigns a provided static safety ID to an [AtomicSafetyHandle](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle.md). | | [UseSecondaryVersion](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/usesecondaryversion.md) | Switches the AtomicSafetyHandle to the secondary version number. | | [ValidateNonDefaultHandle](/engine/6000.6/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/validatenondefaulthandle.md) | Checks that the handle has been initialized, and if so, checks that it is still valid. |