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zos: fix potential event loop stall

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This is a port of 70002c80 to z/OS to fix the same potential issue that
could effectively enter an infinite loop (but not a busy loop) under
certain conditions when polling for events.

PR-URL: https://github.com/libuv/libuv/pull/2725
Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Jameson Nash <vtjnash@gmail.com>
This commit is contained in:
Trevor Norris 2020-03-17 11:03:54 -06:00 committed by Jameson Nash
parent 0a8c1c53b6
commit d0e323971e
1 changed files with 6 additions and 5 deletions
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11
src/unix/os390.c
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@ -887,12 +887,13 @@ void uv__io_poll(uv_loop_t* loop, int timeout) {
if (nfds == 0) {
assert(timeout != -1);
if (timeout > 0) {
timeout = real_timeout - timeout;
continue;
}
if (timeout == 0)
return;
return;
/* We may have been inside the system call for longer than |timeout|
* milliseconds so we need to update the timestamp to avoid drift.
*/
goto update_timeout;
}
if (nfds == -1) {