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loop_close: call uv_stop(), fix bug

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- Call uv_stop().
- Restore `uv_loop_close` condition (braindead cosmetic change from
  a2efc9cf8b that caused uv_loop_close *not* to be called if
  wait=false, sorry).

Not doing `uv_walk(() => uv_close)`: see source comment for explanation.

fix #11820
fix #7376

Q: Should we restore use of `UV_RUN_DEFAULT`/`UV_RUN_ONCE` (removed in
   a2efc9cf8b)?
A: The while-loop (hopefully) achieves the same purpose while avoiding
   a hang.
This commit is contained in:
Justin M. Keyes
2020-02-17 22:41:13 -08:00
parent 284b398eb9
commit d2730365ef
1 changed files with 15 additions and 2 deletions
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17
src/nvim/event/loop.c
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@ -116,10 +116,20 @@ void loop_on_put(MultiQueue *queue, void *data)
uv_stop(&loop->uv);
}
/// Closes `loop` and its handles, and frees its structures.
///
/// @param loop Loop to destroy
/// @param wait Wait briefly for handles to deref
///
/// @returns false if the loop could not be closed gracefully
bool loop_close(Loop *loop, bool wait)
{
bool rv = true;
// Loop won’t block for I/O after this.
uv_stop(&loop->uv);
// TODO(justinmk): Close all (lua/luv!) handles. But walk_cb() needs to call
// the resource-specific close-callbacks...
// uv_walk((h) => { if !uv_is_closing(h) { uv_close(h, …) } })
uv_mutex_destroy(&loop->mutex);
uv_close((uv_handle_t *)&loop->children_watcher, NULL);
uv_close((uv_handle_t *)&loop->children_kill_timer, NULL);
@ -127,11 +137,14 @@ bool loop_close(Loop *loop, bool wait)
uv_close((uv_handle_t *)&loop->async, NULL);
uint64_t start = wait ? os_hrtime() : 0;
while (true) {
// Run the loop to tickle close-callbacks (which should then free memory).
// Use UV_RUN_NOWAIT to avoid a hang. #11820
uv_run(&loop->uv, UV_RUN_NOWAIT);
if (!wait || (uv_loop_close(&loop->uv) != UV_EBUSY)) {
if ((uv_loop_close(&loop->uv) != UV_EBUSY) || !wait) {
break;
}
if (os_hrtime() - start >= 2 * 1000000000) {
uint64_t elapsed_s = (os_hrtime() - start) / 1000000000; // seconds
if (elapsed_s >= 2) {
// Some libuv resource was not correctly deref'd. Log and bail.
rv = false;
ELOG("uv_loop_close() hang?");