eb65d1b078
Before this commit, in case FreeBSD libc jemalloc was overridden by another jemalloc, proper thread shutdown callback was involved only for the overriding jemalloc. A call to _malloc_thread_cleanup from libthr would be redirected to user jemalloc, leaving data about dead threads hanging in system jemalloc. This change tackles the issue in two ways. First, for current and old system jemallocs, which we can not modify, the overriding jemalloc would locate and invoke system cleanup routine. For upcoming jemalloc integrations, the cleanup registering function will also be redirected to user jemalloc, which means that system jemalloc's cleanup routine will be registered in user's jemalloc and a single call to _malloc_thread_cleanup will be sufficient to invoke both callbacks.
519 lines
16 KiB
C
519 lines
16 KiB
C
#ifndef JEMALLOC_INTERNAL_TSD_H
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#define JEMALLOC_INTERNAL_TSD_H
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#include "jemalloc/internal/activity_callback.h"
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#include "jemalloc/internal/arena_types.h"
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#include "jemalloc/internal/assert.h"
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#include "jemalloc/internal/bin_types.h"
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#include "jemalloc/internal/jemalloc_internal_externs.h"
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#include "jemalloc/internal/peak.h"
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#include "jemalloc/internal/prof_types.h"
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#include "jemalloc/internal/ql.h"
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#include "jemalloc/internal/rtree_tsd.h"
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#include "jemalloc/internal/tcache_types.h"
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#include "jemalloc/internal/tcache_structs.h"
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#include "jemalloc/internal/util.h"
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#include "jemalloc/internal/witness.h"
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/*
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* Thread-Specific-Data layout
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*
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* At least some thread-local data gets touched on the fast-path of almost all
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* malloc operations. But much of it is only necessary down slow-paths, or
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* testing. We want to colocate the fast-path data so that it can live on the
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* same cacheline if possible. So we define three tiers of hotness:
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* TSD_DATA_FAST: Touched on the alloc/dalloc fast paths.
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* TSD_DATA_SLOW: Touched down slow paths. "Slow" here is sort of general;
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* there are "semi-slow" paths like "not a sized deallocation, but can still
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* live in the tcache". We'll want to keep these closer to the fast-path
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* data.
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* TSD_DATA_SLOWER: Only touched in test or debug modes, or not touched at all.
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*
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* An additional concern is that the larger tcache bins won't be used (we have a
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* bin per size class, but by default only cache relatively small objects). So
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* the earlier bins are in the TSD_DATA_FAST tier, but the later ones are in the
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* TSD_DATA_SLOWER tier.
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*
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* As a result of all this, we put the slow data first, then the fast data, then
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* the slower data, while keeping the tcache as the last element of the fast
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* data (so that the fast -> slower transition happens midway through the
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* tcache). While we don't yet play alignment tricks to guarantee it, this
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* increases our odds of getting some cache/page locality on fast paths.
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*/
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#ifdef JEMALLOC_JET
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typedef void (*test_callback_t)(int *);
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# define MALLOC_TSD_TEST_DATA_INIT 0x72b65c10
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# define MALLOC_TEST_TSD \
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O(test_data, int, int) \
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O(test_callback, test_callback_t, int)
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# define MALLOC_TEST_TSD_INITIALIZER , MALLOC_TSD_TEST_DATA_INIT, NULL
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#else
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# define MALLOC_TEST_TSD
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# define MALLOC_TEST_TSD_INITIALIZER
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#endif
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typedef ql_elm(tsd_t) tsd_link_t;
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/* O(name, type, nullable type) */
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#define TSD_DATA_SLOW \
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O(tcache_enabled, bool, bool) \
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O(reentrancy_level, int8_t, int8_t) \
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O(thread_allocated_last_event, uint64_t, uint64_t) \
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O(thread_allocated_next_event, uint64_t, uint64_t) \
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O(thread_deallocated_last_event, uint64_t, uint64_t) \
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O(thread_deallocated_next_event, uint64_t, uint64_t) \
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O(tcache_gc_event_wait, uint64_t, uint64_t) \
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O(tcache_gc_dalloc_event_wait, uint64_t, uint64_t) \
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O(prof_sample_event_wait, uint64_t, uint64_t) \
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O(prof_sample_last_event, uint64_t, uint64_t) \
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O(stats_interval_event_wait, uint64_t, uint64_t) \
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O(stats_interval_last_event, uint64_t, uint64_t) \
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O(peak_alloc_event_wait, uint64_t, uint64_t) \
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O(peak_dalloc_event_wait, uint64_t, uint64_t) \
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O(prof_tdata, prof_tdata_t *, prof_tdata_t *) \
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O(prng_state, uint64_t, uint64_t) \
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O(san_extents_until_guard_small, uint64_t, uint64_t) \
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O(san_extents_until_guard_large, uint64_t, uint64_t) \
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O(iarena, arena_t *, arena_t *) \
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O(arena, arena_t *, arena_t *) \
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O(arena_decay_ticker, ticker_geom_t, ticker_geom_t) \
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O(sec_shard, uint8_t, uint8_t) \
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O(binshards, tsd_binshards_t, tsd_binshards_t)\
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O(tsd_link, tsd_link_t, tsd_link_t) \
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O(in_hook, bool, bool) \
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O(peak, peak_t, peak_t) \
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O(activity_callback_thunk, activity_callback_thunk_t, \
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activity_callback_thunk_t) \
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O(tcache_slow, tcache_slow_t, tcache_slow_t) \
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O(rtree_ctx, rtree_ctx_t, rtree_ctx_t)
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#define TSD_DATA_SLOW_INITIALIZER \
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/* tcache_enabled */ TCACHE_ENABLED_ZERO_INITIALIZER, \
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/* reentrancy_level */ 0, \
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/* thread_allocated_last_event */ 0, \
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/* thread_allocated_next_event */ 0, \
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/* thread_deallocated_last_event */ 0, \
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/* thread_deallocated_next_event */ 0, \
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/* tcache_gc_event_wait */ 0, \
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/* tcache_gc_dalloc_event_wait */ 0, \
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/* prof_sample_event_wait */ 0, \
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/* prof_sample_last_event */ 0, \
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/* stats_interval_event_wait */ 0, \
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/* stats_interval_last_event */ 0, \
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/* peak_alloc_event_wait */ 0, \
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/* peak_dalloc_event_wait */ 0, \
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/* prof_tdata */ NULL, \
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/* prng_state */ 0, \
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/* san_extents_until_guard_small */ 0, \
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/* san_extents_until_guard_large */ 0, \
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/* iarena */ NULL, \
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/* arena */ NULL, \
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/* arena_decay_ticker */ \
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TICKER_GEOM_INIT(ARENA_DECAY_NTICKS_PER_UPDATE), \
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/* sec_shard */ (uint8_t)-1, \
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/* binshards */ TSD_BINSHARDS_ZERO_INITIALIZER, \
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/* tsd_link */ {NULL}, \
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/* in_hook */ false, \
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/* peak */ PEAK_INITIALIZER, \
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/* activity_callback_thunk */ \
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ACTIVITY_CALLBACK_THUNK_INITIALIZER, \
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/* tcache_slow */ TCACHE_SLOW_ZERO_INITIALIZER, \
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/* rtree_ctx */ RTREE_CTX_INITIALIZER,
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/* O(name, type, nullable type) */
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#define TSD_DATA_FAST \
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O(thread_allocated, uint64_t, uint64_t) \
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O(thread_allocated_next_event_fast, uint64_t, uint64_t) \
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O(thread_deallocated, uint64_t, uint64_t) \
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O(thread_deallocated_next_event_fast, uint64_t, uint64_t) \
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O(tcache, tcache_t, tcache_t)
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#define TSD_DATA_FAST_INITIALIZER \
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/* thread_allocated */ 0, \
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/* thread_allocated_next_event_fast */ 0, \
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/* thread_deallocated */ 0, \
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/* thread_deallocated_next_event_fast */ 0, \
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/* tcache */ TCACHE_ZERO_INITIALIZER,
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/* O(name, type, nullable type) */
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#define TSD_DATA_SLOWER \
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O(witness_tsd, witness_tsd_t, witness_tsdn_t) \
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MALLOC_TEST_TSD
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#define TSD_DATA_SLOWER_INITIALIZER \
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/* witness */ WITNESS_TSD_INITIALIZER \
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/* test data */ MALLOC_TEST_TSD_INITIALIZER
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#define TSD_INITIALIZER { \
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TSD_DATA_SLOW_INITIALIZER \
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/* state */ ATOMIC_INIT(tsd_state_uninitialized), \
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TSD_DATA_FAST_INITIALIZER \
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TSD_DATA_SLOWER_INITIALIZER \
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}
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#if defined(JEMALLOC_MALLOC_THREAD_CLEANUP) || defined(_WIN32)
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void _malloc_tsd_cleanup_register(bool (*f)(void));
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#endif
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void *malloc_tsd_malloc(size_t size);
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void malloc_tsd_dalloc(void *wrapper);
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tsd_t *malloc_tsd_boot0(void);
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void malloc_tsd_boot1(void);
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void tsd_cleanup(void *arg);
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tsd_t *tsd_fetch_slow(tsd_t *tsd, bool internal);
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void tsd_state_set(tsd_t *tsd, uint8_t new_state);
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void tsd_slow_update(tsd_t *tsd);
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void tsd_prefork(tsd_t *tsd);
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void tsd_postfork_parent(tsd_t *tsd);
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void tsd_postfork_child(tsd_t *tsd);
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/*
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* Call ..._inc when your module wants to take all threads down the slow paths,
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* and ..._dec when it no longer needs to.
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*/
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void tsd_global_slow_inc(tsdn_t *tsdn);
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void tsd_global_slow_dec(tsdn_t *tsdn);
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bool tsd_global_slow();
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enum {
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/* Common case --> jnz. */
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tsd_state_nominal = 0,
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/* Initialized but on slow path. */
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tsd_state_nominal_slow = 1,
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/*
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* Some thread has changed global state in such a way that all nominal
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* threads need to recompute their fast / slow status the next time they
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* get a chance.
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*
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* Any thread can change another thread's status *to* recompute, but
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* threads are the only ones who can change their status *from*
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* recompute.
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*/
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tsd_state_nominal_recompute = 2,
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/*
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* The above nominal states should be lower values. We use
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* tsd_nominal_max to separate nominal states from threads in the
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* process of being born / dying.
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*/
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tsd_state_nominal_max = 2,
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/*
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* A thread might free() during its death as its only allocator action;
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* in such scenarios, we need tsd, but set up in such a way that no
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* cleanup is necessary.
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*/
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tsd_state_minimal_initialized = 3,
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/* States during which we know we're in thread death. */
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tsd_state_purgatory = 4,
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tsd_state_reincarnated = 5,
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/*
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* What it says on the tin; tsd that hasn't been initialized. Note
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* that even when the tsd struct lives in TLS, when need to keep track
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* of stuff like whether or not our pthread destructors have been
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* scheduled, so this really truly is different than the nominal state.
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*/
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tsd_state_uninitialized = 6
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};
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/*
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* Some TSD accesses can only be done in a nominal state. To enforce this, we
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* wrap TSD member access in a function that asserts on TSD state, and mangle
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* field names to prevent touching them accidentally.
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*/
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#define TSD_MANGLE(n) cant_access_tsd_items_directly_use_a_getter_or_setter_##n
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#ifdef JEMALLOC_U8_ATOMICS
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# define tsd_state_t atomic_u8_t
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# define tsd_atomic_load atomic_load_u8
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# define tsd_atomic_store atomic_store_u8
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# define tsd_atomic_exchange atomic_exchange_u8
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#else
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# define tsd_state_t atomic_u32_t
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# define tsd_atomic_load atomic_load_u32
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# define tsd_atomic_store atomic_store_u32
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# define tsd_atomic_exchange atomic_exchange_u32
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#endif
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/* The actual tsd. */
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struct tsd_s {
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/*
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* The contents should be treated as totally opaque outside the tsd
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* module. Access any thread-local state through the getters and
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* setters below.
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*/
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#define O(n, t, nt) \
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t TSD_MANGLE(n);
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TSD_DATA_SLOW
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/*
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* We manually limit the state to just a single byte. Unless the 8-bit
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* atomics are unavailable (which is rare).
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*/
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tsd_state_t state;
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TSD_DATA_FAST
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TSD_DATA_SLOWER
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#undef O
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};
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JEMALLOC_ALWAYS_INLINE uint8_t
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tsd_state_get(tsd_t *tsd) {
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/*
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* This should be atomic. Unfortunately, compilers right now can't tell
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* that this can be done as a memory comparison, and forces a load into
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* a register that hurts fast-path performance.
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*/
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/* return atomic_load_u8(&tsd->state, ATOMIC_RELAXED); */
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return *(uint8_t *)&tsd->state;
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}
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/*
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* Wrapper around tsd_t that makes it possible to avoid implicit conversion
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* between tsd_t and tsdn_t, where tsdn_t is "nullable" and has to be
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* explicitly converted to tsd_t, which is non-nullable.
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*/
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struct tsdn_s {
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tsd_t tsd;
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};
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#define TSDN_NULL ((tsdn_t *)0)
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JEMALLOC_ALWAYS_INLINE tsdn_t *
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tsd_tsdn(tsd_t *tsd) {
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return (tsdn_t *)tsd;
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}
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JEMALLOC_ALWAYS_INLINE bool
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tsdn_null(const tsdn_t *tsdn) {
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return tsdn == NULL;
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}
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JEMALLOC_ALWAYS_INLINE tsd_t *
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tsdn_tsd(tsdn_t *tsdn) {
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assert(!tsdn_null(tsdn));
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return &tsdn->tsd;
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}
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/*
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* We put the platform-specific data declarations and inlines into their own
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* header files to avoid cluttering this file. They define tsd_boot0,
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* tsd_boot1, tsd_boot, tsd_booted_get, tsd_get_allocates, tsd_get, and tsd_set.
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*/
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#ifdef JEMALLOC_MALLOC_THREAD_CLEANUP
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#include "jemalloc/internal/tsd_malloc_thread_cleanup.h"
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#elif (defined(JEMALLOC_TLS))
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#include "jemalloc/internal/tsd_tls.h"
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#elif (defined(_WIN32))
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#include "jemalloc/internal/tsd_win.h"
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#else
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#include "jemalloc/internal/tsd_generic.h"
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#endif
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/*
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* tsd_foop_get_unsafe(tsd) returns a pointer to the thread-local instance of
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* foo. This omits some safety checks, and so can be used during tsd
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* initialization and cleanup.
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*/
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#define O(n, t, nt) \
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JEMALLOC_ALWAYS_INLINE t * \
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tsd_##n##p_get_unsafe(tsd_t *tsd) { \
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return &tsd->TSD_MANGLE(n); \
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}
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TSD_DATA_SLOW
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TSD_DATA_FAST
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TSD_DATA_SLOWER
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#undef O
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/* tsd_foop_get(tsd) returns a pointer to the thread-local instance of foo. */
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#define O(n, t, nt) \
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JEMALLOC_ALWAYS_INLINE t * \
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tsd_##n##p_get(tsd_t *tsd) { \
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/* \
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* Because the state might change asynchronously if it's \
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* nominal, we need to make sure that we only read it once. \
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*/ \
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uint8_t state = tsd_state_get(tsd); \
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assert(state == tsd_state_nominal || \
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state == tsd_state_nominal_slow || \
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state == tsd_state_nominal_recompute || \
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state == tsd_state_reincarnated || \
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state == tsd_state_minimal_initialized); \
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return tsd_##n##p_get_unsafe(tsd); \
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}
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TSD_DATA_SLOW
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TSD_DATA_FAST
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TSD_DATA_SLOWER
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#undef O
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/*
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* tsdn_foop_get(tsdn) returns either the thread-local instance of foo (if tsdn
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* isn't NULL), or NULL (if tsdn is NULL), cast to the nullable pointer type.
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*/
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#define O(n, t, nt) \
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JEMALLOC_ALWAYS_INLINE nt * \
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tsdn_##n##p_get(tsdn_t *tsdn) { \
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if (tsdn_null(tsdn)) { \
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return NULL; \
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} \
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tsd_t *tsd = tsdn_tsd(tsdn); \
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return (nt *)tsd_##n##p_get(tsd); \
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}
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TSD_DATA_SLOW
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TSD_DATA_FAST
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TSD_DATA_SLOWER
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#undef O
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/* tsd_foo_get(tsd) returns the value of the thread-local instance of foo. */
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#define O(n, t, nt) \
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JEMALLOC_ALWAYS_INLINE t \
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tsd_##n##_get(tsd_t *tsd) { \
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return *tsd_##n##p_get(tsd); \
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}
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TSD_DATA_SLOW
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TSD_DATA_FAST
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TSD_DATA_SLOWER
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#undef O
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/* tsd_foo_set(tsd, val) updates the thread-local instance of foo to be val. */
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#define O(n, t, nt) \
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JEMALLOC_ALWAYS_INLINE void \
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tsd_##n##_set(tsd_t *tsd, t val) { \
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assert(tsd_state_get(tsd) != tsd_state_reincarnated && \
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tsd_state_get(tsd) != tsd_state_minimal_initialized); \
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*tsd_##n##p_get(tsd) = val; \
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}
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TSD_DATA_SLOW
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TSD_DATA_FAST
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TSD_DATA_SLOWER
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#undef O
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JEMALLOC_ALWAYS_INLINE void
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tsd_assert_fast(tsd_t *tsd) {
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/*
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* Note that our fastness assertion does *not* include global slowness
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* counters; it's not in general possible to ensure that they won't
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* change asynchronously from underneath us.
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*/
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assert(!malloc_slow && tsd_tcache_enabled_get(tsd) &&
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tsd_reentrancy_level_get(tsd) == 0);
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}
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JEMALLOC_ALWAYS_INLINE bool
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tsd_fast(tsd_t *tsd) {
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bool fast = (tsd_state_get(tsd) == tsd_state_nominal);
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if (fast) {
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tsd_assert_fast(tsd);
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}
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return fast;
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}
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JEMALLOC_ALWAYS_INLINE tsd_t *
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tsd_fetch_impl(bool init, bool minimal) {
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tsd_t *tsd = tsd_get(init);
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if (!init && tsd_get_allocates() && tsd == NULL) {
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return NULL;
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}
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assert(tsd != NULL);
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if (unlikely(tsd_state_get(tsd) != tsd_state_nominal)) {
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return tsd_fetch_slow(tsd, minimal);
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}
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assert(tsd_fast(tsd));
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tsd_assert_fast(tsd);
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return tsd;
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}
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/* Get a minimal TSD that requires no cleanup. See comments in free(). */
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JEMALLOC_ALWAYS_INLINE tsd_t *
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|
tsd_fetch_min(void) {
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|
return tsd_fetch_impl(true, true);
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|
}
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|
|
|
/* For internal background threads use only. */
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|
JEMALLOC_ALWAYS_INLINE tsd_t *
|
|
tsd_internal_fetch(void) {
|
|
tsd_t *tsd = tsd_fetch_min();
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|
/* Use reincarnated state to prevent full initialization. */
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|
tsd_state_set(tsd, tsd_state_reincarnated);
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|
|
|
return tsd;
|
|
}
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|
|
|
JEMALLOC_ALWAYS_INLINE tsd_t *
|
|
tsd_fetch(void) {
|
|
return tsd_fetch_impl(true, false);
|
|
}
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|
|
|
static inline bool
|
|
tsd_nominal(tsd_t *tsd) {
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|
bool nominal = tsd_state_get(tsd) <= tsd_state_nominal_max;
|
|
assert(nominal || tsd_reentrancy_level_get(tsd) > 0);
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|
|
|
return nominal;
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE tsdn_t *
|
|
tsdn_fetch(void) {
|
|
if (!tsd_booted_get()) {
|
|
return NULL;
|
|
}
|
|
|
|
return tsd_tsdn(tsd_fetch_impl(false, false));
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE rtree_ctx_t *
|
|
tsd_rtree_ctx(tsd_t *tsd) {
|
|
return tsd_rtree_ctxp_get(tsd);
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE rtree_ctx_t *
|
|
tsdn_rtree_ctx(tsdn_t *tsdn, rtree_ctx_t *fallback) {
|
|
/*
|
|
* If tsd cannot be accessed, initialize the fallback rtree_ctx and
|
|
* return a pointer to it.
|
|
*/
|
|
if (unlikely(tsdn_null(tsdn))) {
|
|
rtree_ctx_data_init(fallback);
|
|
return fallback;
|
|
}
|
|
return tsd_rtree_ctx(tsdn_tsd(tsdn));
|
|
}
|
|
|
|
static inline bool
|
|
tsd_state_nocleanup(tsd_t *tsd) {
|
|
return tsd_state_get(tsd) == tsd_state_reincarnated ||
|
|
tsd_state_get(tsd) == tsd_state_minimal_initialized;
|
|
}
|
|
|
|
/*
|
|
* These "raw" tsd reentrancy functions don't have any debug checking to make
|
|
* sure that we're not touching arena 0. Better is to call pre_reentrancy and
|
|
* post_reentrancy if this is possible.
|
|
*/
|
|
static inline void
|
|
tsd_pre_reentrancy_raw(tsd_t *tsd) {
|
|
bool fast = tsd_fast(tsd);
|
|
assert(tsd_reentrancy_level_get(tsd) < INT8_MAX);
|
|
++*tsd_reentrancy_levelp_get(tsd);
|
|
if (fast) {
|
|
/* Prepare slow path for reentrancy. */
|
|
tsd_slow_update(tsd);
|
|
assert(tsd_state_get(tsd) == tsd_state_nominal_slow);
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
tsd_post_reentrancy_raw(tsd_t *tsd) {
|
|
int8_t *reentrancy_level = tsd_reentrancy_levelp_get(tsd);
|
|
assert(*reentrancy_level > 0);
|
|
if (--*reentrancy_level == 0) {
|
|
tsd_slow_update(tsd);
|
|
}
|
|
}
|
|
|
|
#endif /* JEMALLOC_INTERNAL_TSD_H */
|