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Convert prng module to use C11-style atomics

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This commit is contained in:
David Goldblatt 2017-04-03 18:18:40 -07:00 committed by David Goldblatt
parent 492e9f301e
commit 7da04a6b09
4 changed files with 46 additions and 43 deletions
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2
include/jemalloc/internal/arena_structs_b.h
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@ -166,7 +166,7 @@ struct arena_s {
*
* Synchronization: atomic.
*/
size_t offset_state;
atomic_zu_t offset_state;
/*
* Extent serial number generator state.

45
include/jemalloc/internal/prng_inlines.h
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@ -6,14 +6,15 @@ uint32_t prng_state_next_u32(uint32_t state);
uint64_t prng_state_next_u64(uint64_t state);
size_t prng_state_next_zu(size_t state);
uint32_t prng_lg_range_u32(uint32_t *state, unsigned lg_range,
uint32_t prng_lg_range_u32(atomic_u32_t *state, unsigned lg_range,
bool atomic);
uint64_t prng_lg_range_u64(uint64_t *state, unsigned lg_range);
size_t prng_lg_range_zu(size_t *state, unsigned lg_range, bool atomic);
size_t prng_lg_range_zu(atomic_zu_t *state, unsigned lg_range, bool atomic);
uint32_t prng_range_u32(uint32_t *state, uint32_t range, bool atomic);
uint32_t prng_range_u32(atomic_u32_t *state, uint32_t range,
bool atomic);
uint64_t prng_range_u64(uint64_t *state, uint64_t range);
size_t prng_range_zu(size_t *state, size_t range, bool atomic);
size_t prng_range_zu(atomic_zu_t *state, size_t range, bool atomic);
#endif
#if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_PRNG_C_))
@ -39,22 +40,22 @@ prng_state_next_zu(size_t state) {
}
JEMALLOC_ALWAYS_INLINE uint32_t
prng_lg_range_u32(uint32_t *state, unsigned lg_range, bool atomic) {
uint32_t ret, state1;
prng_lg_range_u32(atomic_u32_t *state, unsigned lg_range, bool atomic) {
uint32_t ret, state0, state1;
assert(lg_range > 0);
assert(lg_range <= 32);
if (atomic) {
uint32_t state0;
state0 = atomic_load_u32(state, ATOMIC_RELAXED);
if (atomic) {
do {
state0 = atomic_read_u32(state);
state1 = prng_state_next_u32(state0);
} while (atomic_cas_u32(state, state0, state1));
} while (!atomic_compare_exchange_weak_u32(state, &state0,
state1, ATOMIC_RELAXED, ATOMIC_RELAXED));
} else {
state1 = prng_state_next_u32(*state);
*state = state1;
state1 = prng_state_next_u32(state0);
atomic_store_u32(state, state1, ATOMIC_RELAXED);
}
ret = state1 >> (32 - lg_range);
@ -77,22 +78,22 @@ prng_lg_range_u64(uint64_t *state, unsigned lg_range) {
}
JEMALLOC_ALWAYS_INLINE size_t
prng_lg_range_zu(size_t *state, unsigned lg_range, bool atomic) {
size_t ret, state1;
prng_lg_range_zu(atomic_zu_t *state, unsigned lg_range, bool atomic) {
size_t ret, state0, state1;
assert(lg_range > 0);
assert(lg_range <= ZU(1) << (3 + LG_SIZEOF_PTR));
if (atomic) {
size_t state0;
state0 = atomic_load_zu(state, ATOMIC_RELAXED);
if (atomic) {
do {
state0 = atomic_read_zu(state);
state1 = prng_state_next_zu(state0);
} while (atomic_cas_zu(state, state0, state1));
} while (atomic_compare_exchange_weak_zu(state, &state0,
state1, ATOMIC_RELAXED, ATOMIC_RELAXED));
} else {
state1 = prng_state_next_zu(*state);
*state = state1;
state1 = prng_state_next_zu(state0);
atomic_store_zu(state, state1, ATOMIC_RELAXED);
}
ret = state1 >> ((ZU(1) << (3 + LG_SIZEOF_PTR)) - lg_range);
@ -100,7 +101,7 @@ prng_lg_range_zu(size_t *state, unsigned lg_range, bool atomic) {
}
JEMALLOC_ALWAYS_INLINE uint32_t
prng_range_u32(uint32_t *state, uint32_t range, bool atomic) {
prng_range_u32(atomic_u32_t *state, uint32_t range, bool atomic) {
uint32_t ret;
unsigned lg_range;
@ -136,7 +137,7 @@ prng_range_u64(uint64_t *state, uint64_t range) {
}
JEMALLOC_ALWAYS_INLINE size_t
prng_range_zu(size_t *state, size_t range, bool atomic) {
prng_range_zu(atomic_zu_t *state, size_t range, bool atomic) {
size_t ret;
unsigned lg_range;

4
src/arena.c
View File

@ -1863,8 +1863,8 @@ arena_new(tsdn_t *tsdn, unsigned ind, extent_hooks_t *extent_hooks) {
* cost of test repeatability. For debug builds, instead use a
* deterministic seed.
*/
arena->offset_state = config_debug ? ind :
(size_t)(uintptr_t)arena;
atomic_store_zu(&arena->offset_state, config_debug ? ind :
(size_t)(uintptr_t)arena, ATOMIC_RELAXED);
}
arena->extent_sn_next = 0;

38
test/unit/prng.c
View File

@ -2,31 +2,32 @@
static void
test_prng_lg_range_u32(bool atomic) {
uint32_t sa, sb, ra, rb;
atomic_u32_t sa, sb;
uint32_t ra, rb;
unsigned lg_range;
sa = 42;
atomic_store_u32(&sa, 42, ATOMIC_RELAXED);
ra = prng_lg_range_u32(&sa, 32, atomic);
sa = 42;
atomic_store_u32(&sa, 42, ATOMIC_RELAXED);
rb = prng_lg_range_u32(&sa, 32, atomic);
assert_u32_eq(ra, rb,
"Repeated generation should produce repeated results");
sb = 42;
atomic_store_u32(&sb, 42, ATOMIC_RELAXED);
rb = prng_lg_range_u32(&sb, 32, atomic);
assert_u32_eq(ra, rb,
"Equivalent generation should produce equivalent results");
sa = 42;
atomic_store_u32(&sa, 42, ATOMIC_RELAXED);
ra = prng_lg_range_u32(&sa, 32, atomic);
rb = prng_lg_range_u32(&sa, 32, atomic);
assert_u32_ne(ra, rb,
"Full-width results must not immediately repeat");
sa = 42;
atomic_store_u32(&sa, 42, ATOMIC_RELAXED);
ra = prng_lg_range_u32(&sa, 32, atomic);
for (lg_range = 31; lg_range > 0; lg_range--) {
sb = 42;
atomic_store_u32(&sb, 42, ATOMIC_RELAXED);
rb = prng_lg_range_u32(&sb, lg_range, atomic);
assert_u32_eq((rb & (UINT32_C(0xffffffff) << lg_range)),
0, "High order bits should be 0, lg_range=%u", lg_range);
@ -74,32 +75,33 @@ test_prng_lg_range_u64(void) {
static void
test_prng_lg_range_zu(bool atomic) {
size_t sa, sb, ra, rb;
atomic_zu_t sa, sb;
size_t ra, rb;
unsigned lg_range;
sa = 42;
atomic_store_zu(&sa, 42, ATOMIC_RELAXED);
ra = prng_lg_range_zu(&sa, ZU(1) << (3 + LG_SIZEOF_PTR), atomic);
sa = 42;
atomic_store_zu(&sa, 42, ATOMIC_RELAXED);
rb = prng_lg_range_zu(&sa, ZU(1) << (3 + LG_SIZEOF_PTR), atomic);
assert_zu_eq(ra, rb,
"Repeated generation should produce repeated results");
sb = 42;
atomic_store_zu(&sb, 42, ATOMIC_RELAXED);
rb = prng_lg_range_zu(&sb, ZU(1) << (3 + LG_SIZEOF_PTR), atomic);
assert_zu_eq(ra, rb,
"Equivalent generation should produce equivalent results");
sa = 42;
atomic_store_zu(&sa, 42, ATOMIC_RELAXED);
ra = prng_lg_range_zu(&sa, ZU(1) << (3 + LG_SIZEOF_PTR), atomic);
rb = prng_lg_range_zu(&sa, ZU(1) << (3 + LG_SIZEOF_PTR), atomic);
assert_zu_ne(ra, rb,
"Full-width results must not immediately repeat");
sa = 42;
atomic_store_zu(&sa, 42, ATOMIC_RELAXED);
ra = prng_lg_range_zu(&sa, ZU(1) << (3 + LG_SIZEOF_PTR), atomic);
for (lg_range = (ZU(1) << (3 + LG_SIZEOF_PTR)) - 1; lg_range > 0;
lg_range--) {
sb = 42;
atomic_store_zu(&sb, 42, ATOMIC_RELAXED);
rb = prng_lg_range_zu(&sb, lg_range, atomic);
assert_zu_eq((rb & (SIZE_T_MAX << lg_range)),
0, "High order bits should be 0, lg_range=%u", lg_range);
@ -142,10 +144,10 @@ test_prng_range_u32(bool atomic) {
#define NREPS 10
for (range = 2; range < MAX_RANGE; range += RANGE_STEP) {
uint32_t s;
atomic_u32_t s;
unsigned rep;
s = range;
atomic_store_u32(&s, range, ATOMIC_RELAXED);
for (rep = 0; rep < NREPS; rep++) {
uint32_t r = prng_range_u32(&s, range, atomic);
@ -182,10 +184,10 @@ test_prng_range_zu(bool atomic) {
#define NREPS 10
for (range = 2; range < MAX_RANGE; range += RANGE_STEP) {
size_t s;
atomic_zu_t s;
unsigned rep;
s = range;
atomic_store_zu(&s, range, ATOMIC_RELAXED);
for (rep = 0; rep < NREPS; rep++) {
size_t r = prng_range_zu(&s, range, atomic);