Rqt-close - Odin

close_resource :: proc(resource: ^Raw_Resource) when ODIN_OS == "windows" sys.windows.CloseHandle(resource.handle) else when ODIN_OS == "linux" sys.linux.close(resource.fd) resource.valid = false

rqt-close is not a magic keyword or a hidden runtime feature. It is a discipline . By writing an explicit close for every opened file, created handle, or allocated system object, you retain full control over your program’s interaction with the operating system.

Close_Handle :: proc(h: windows.HANDLE) -> bool if h == windows.INVALID_HANDLE_VALUE do return true return windows.CloseHandle(h) odin rqt-close

If you have dependent resources (e.g., a file mapping before the file handle), close child resources first. 3. Defer is Your Friend Odin’s defer statement is perfect for pairing allocation with release:

h := CreateFile("data.txt", ...) defer CloseHandle(h) // Guaranteed to run on scope exit // ... use h ... Close_Handle :: proc(h: windows

Odin’s lack of automatic cleanup is a feature, not a bug. It forces you to think about resource lifetimes at every step, leading to more predictable and often more efficient software. The rqt-close pattern—whether you name it that or simply call CloseHandle directly—is the cornerstone of robust system programming in Odin.

when ODIN_OS == "windows" close_fn :: proc(h: rawptr) windows.CloseHandle(transmute(windows.HANDLE)h) else when ODIN_OS == "linux" || ODIN_OS == "darwin" close_fn :: proc(fd: rawptr) sys.linux.close(transmute(int)fd) Close_Handle :: proc(h: windows.HANDLE) -&gt

import "core:runtime" cleanup_my_resource :: proc(data: rawptr) handle := cast(^windows.HANDLE)data CloseHandle(handle^)

Or for a cross-platform abstraction:

if my_handle != INVALID_HANDLE CloseHandle(my_handle) my_handle = INVALID_HANDLE

package resource import "core:sys/windows"