# [−][src]Function core::arch::nvptx::free

    pub unsafe extern "C" fn free(ptr: *mut c_void)

🔬 This is a nightly-only experimental API. (`stdsimd` #48556)
This is supported on `target_arch="nvptx"` or `target_arch="nvptx64"` only.

Free previously dynamically allocated memory.

The CUDA in-kernel `free()` function deallocates the memory pointed to by `ptr`, which must have been returned by a previous call to `malloc()`. If `ptr` is NULL, the call to `free()` is ignored.

Any CUDA thread may free memory allocated by another thread, but care should be taken to ensure that the same pointer is not freed more than once. Repeated calls to `free()` with the same `ptr` has undefined behavior.

Sources: Programming Guide, PTX Interoperability.

# Help

## Keyboard Shortcuts

`?`
  Show this help dialog
`S`
  Focus the search field
`↑`
  Move up in search results
`↓`
  Move down in search results
`↹`
  Switch tab
`⏎`
  Go to active search result
`+`
  Expand all sections
`-`
  Collapse all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g., `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g., `vec -> usize` or `* -> vec`)

Search multiple things at once by splitting your query with comma (e.g., `str,u8` or `String,struct:Vec,test`)