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Refactor arenas array (fixes deadlock).

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Refactor the arenas array, which contains pointers to all extant arenas,
such that it starts out as a sparse array of maximum size, and use
double-checked atomics-based reads as the basis for fast and simple
arena_get().  Additionally, reduce arenas_lock's role such that it only
protects against arena initalization races.  These changes remove the
possibility for arena lookups to trigger locking, which resolves at
least one known (fork-related) deadlock.

This resolves #315.
This commit is contained in:
Jason Evans 2016-02-24 23:58:10 -08:00
parent 3812729167
commit 767d85061a
9 changed files with 162 additions and 214 deletions
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4
src/chunk.c
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@ -415,9 +415,7 @@ chunk_arena_get(unsigned arena_ind)
{
arena_t *arena;
/* Dodge tsd for a0 in order to avoid bootstrapping issues. */
arena = (arena_ind == 0) ? a0get() : arena_get(tsd_fetch(), arena_ind,
false, true);
arena = arena_get(arena_ind, false);
/*
* The arena we're allocating on behalf of must have been initialized
* already.