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Add basic reentrancy-checking support, and allow arena_new to reenter.

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This checks whether or not we're reentrant using thread-local data, and, if we
are, moves certain internal allocations to use arena 0 (which should be properly
initialized after bootstrapping).

The immediate thing this allows is spinning up threads in arena_new, which will
enable spinning up background threads there.
This commit is contained in:
David Goldblatt 2017-03-31 19:59:45 -07:00 • committed by David Goldblatt
parent 0a0fcd3e6a
commit b407a65401
10 changed files with 170 additions and 47 deletions
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13
src/arena.c
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@ -1952,6 +1952,19 @@ arena_new(tsdn_t *tsdn, unsigned ind, extent_hooks_t *extent_hooks) {
arena->base = base;
/* We don't support reetrancy for arena 0 bootstrapping. */
if (ind != 0 && hooks_arena_new_hook) {
/*
* If we're here, then arena 0 already exists, so bootstrapping
* is done enough that we should have tsd.
*/
int *reentrancy_level = tsd_reentrancy_levelp_get(tsdn_tsd(
tsdn));
++*reentrancy_level;
hooks_arena_new_hook();
--*reentrancy_level;
}
return arena;
label_error:
if (ind != 0) {