From 320fa579ec966051fd5bed1c88c39d5512a4bd17 Mon Sep 17 00:00:00 2001 From: Jeff King Date: Tue, 30 Aug 2022 15:46:01 -0400 Subject: [PATCH] tempfile: update comment describing state transitions Back when 1a9d15db25 (tempfile: a new module for handling temporary files, 2015-08-10) added this comment, tempfile structs were held in memory for the life of a process, and there were various guarantees about which fields were valid in which states. Since 422a21c6a0 (tempfile: remove deactivated list entries, 2017-09-05) and 076aa2cbda (tempfile: auto-allocate tempfiles on heap, 2017-09-05), the flow is quite different: objects come and go from the list, and inactive ones are deallocated. And the previous commit removed the "active" flag from the struct entirely. Let's bring the comment up to date with the current code. Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- tempfile.c | 18 +++++------------- 1 file changed, 5 insertions(+), 13 deletions(-) diff --git a/tempfile.c b/tempfile.c index 29e61077a8..e27048f970 100644 --- a/tempfile.c +++ b/tempfile.c @@ -14,16 +14,14 @@ * * The possible states of a `tempfile` object are as follows: * - * - Uninitialized. In this state the object's `on_list` field must be - * zero but the rest of its contents need not be initialized. As - * soon as the object is used in any way, it is irrevocably - * registered in `tempfile_list`, and `on_list` is set. + * - Inactive/unallocated. The only way to get a tempfile is via a creation + * function like create_tempfile(). Once allocated, the tempfile is on the + * global tempfile_list and considered active. * * - Active, file open (after `create_tempfile()` or * `reopen_tempfile()`). In this state: * * - the temporary file exists - * - `active` is set * - `filename` holds the filename of the temporary file * - `fd` holds a file descriptor open for writing to it * - `fp` holds a pointer to an open `FILE` object if and only if @@ -35,14 +33,8 @@ * `fd` is -1, and `fp` is `NULL`. * * - Inactive (after `delete_tempfile()`, `rename_tempfile()`, or a - * failed attempt to create a temporary file). In this state: - * - * - `active` is unset - * - `filename` is empty (usually, though there are transitory - * states in which this condition doesn't hold). Client code should - * *not* rely on the filename being empty in this state. - * - `fd` is -1 and `fp` is `NULL` - * - the object is removed from `tempfile_list` (but could be used again) + * failed attempt to create a temporary file). The struct is removed from + * the global tempfile_list and deallocated. * * A temporary file is owned by the process that created it. The * `tempfile` has an `owner` field that records the owner's PID. This