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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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38
test/unit/prng.c
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@@ -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);