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_pt_thread_death_internal(), which is part of Linux's nptl pthreads

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implementation, calls free() after calling TSD destructors.  This was causing a
crash during thread exit, since the magazine rack was no longer valid for the
thread.  Fix this by using a special mag_rack value to indicate that
deallocation should bypass the magazine machinery.
This commit is contained in:
Jason Evans 2009-11-09 14:58:12 -08:00
parent 6f89d4b806
commit d3068c3f46
1 changed files with 22 additions and 9 deletions
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31
jemalloc/src/jemalloc.c
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@ -3977,18 +3977,33 @@ arena_dalloc(arena_t *arena, arena_chunk_t *chunk, void *ptr)
#ifdef JEMALLOC_MAG
if (opt_mag) {
mag_rack_t *rack = mag_rack;
if (rack == NULL) {
rack = mag_rack_create(arena);
if ((uintptr_t)rack > (uintptr_t)1)
mag_rack_dalloc(rack, ptr);
else {
if (rack == NULL) {
rack = mag_rack_create(arena);
if (rack == NULL) {
malloc_spin_lock(&arena->lock);
arena_dalloc_small(arena,
chunk, ptr, mapelm);
malloc_spin_unlock(
&arena->lock);
}
mag_rack = rack;
pthread_setspecific(mag_rack_tsd, rack);
mag_rack_dalloc(rack, ptr);
} else {
/*
* This thread is currently exiting, so
* directly deallocate.
*/
assert(rack == (void *)(uintptr_t)1);
malloc_spin_lock(&arena->lock);
arena_dalloc_small(arena, chunk, ptr,
mapelm);
malloc_spin_unlock(&arena->lock);
}
mag_rack = rack;
pthread_setspecific(mag_rack_tsd, rack);
}
mag_rack_dalloc(rack, ptr);
} else {
#endif
malloc_spin_lock(&arena->lock);
@ -5759,11 +5774,9 @@ thread_cleanup(void *arg)
#ifdef JEMALLOC_MAG
assert((mag_rack_t *)arg == mag_rack);
if (mag_rack != NULL) {
assert(mag_rack != (void *)-1);
assert(mag_rack != (void *)(uintptr_t)1);
mag_rack_destroy(mag_rack);
#ifdef JEMALLOC_DEBUG
mag_rack = (void *)-1;
#endif
mag_rack = (void *)(uintptr_t)1;
}
#endif
}