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vere: restores a necessary layer of reallocation

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This commit is contained in:
Joe Bryan 2020-09-11 15:38:55 -07:00
parent faaaa9415d
commit ad4d6368da
1 changed files with 11 additions and 1 deletions
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12
pkg/urbit/vere/io/term.c
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@ -489,7 +489,17 @@ _term_it_show_line(u3_utty* uty_u, c3_w wor_w, c3_w sap_w)
{
u3_utat* tat_u = &uty_u->tat_u;
_term_it_dump(uty_u, tat_u->mir.byt_w, tat_u->mir.lin_y);
// we have to reallocate the current line on write,
// or we have a data race if a) the write is async,
// and b) a new output line arrives before the write completes.
//
{
c3_w len_w = tat_u->mir.byt_w;
c3_y* hun_y = c3_malloc(len_w);
memcpy(hun_y, tat_u->mir.lin_y, len_w);
_term_it_send(uty_u, len_w, hun_y);
}
// XX refactor to avoid updating state
//