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Add note about safety of std::env::set_var on Windows

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This commit is contained in:
Tobias Bucher 2024-05-24 10:04:44 +02:00
parent 5d8f9b4dc1
commit 8cf4980648
1 changed files with 11 additions and 5 deletions
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16
library/std/src/env.rs
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@ -320,11 +320,14 @@ impl Error for VarError {
///
/// This function is safe to call in a single-threaded program.
///
/// In multi-threaded programs, you must ensure that are no other threads
/// concurrently writing or *reading*(!) from the environment through functions
/// other than the ones in this module. You are responsible for figuring out
/// how to achieve this, but we strongly suggest not using `set_var` or
/// `remove_var` in multi-threaded programs at all.
/// This function is also always safe to call on Windows, in single-threaded
/// and multi-threaded programs.
///
/// In multi-threaded programs on other operating systems, you must ensure that
/// are no other threads concurrently writing or *reading*(!) from the
/// environment through functions other than the ones in this module. You are
/// responsible for figuring out how to achieve this, but we strongly suggest
/// not using `set_var` or `remove_var` in multi-threaded programs at all.
///
/// Most C libraries, including libc itself, do not advertise which functions
/// read from the environment. Even functions from the Rust standard library do
@ -379,6 +382,9 @@ unsafe fn _set_var(key: &OsStr, value: &OsStr) {
///
/// This function is safe to call in a single-threaded program.
///
/// This function is also always safe to call on Windows, in single-threaded
/// and multi-threaded programs.
///
/// In multi-threaded programs, you must ensure that are no other threads
/// concurrently writing or *reading*(!) from the environment through functions
/// other than the ones in this module. You are responsible for figuring out