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reflock: use Interlocked functions directly, use long instead of uint32_t

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This commit is contained in:
Bert Belder 2018-06-04 23:04:46 -07:00
parent 49146ab381
commit 74e6f02ee4
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GPG Key ID: 7A77887B2E2ED461
2 changed files with 13 additions and 25 deletions
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36
src/reflock.c
View File

@ -9,11 +9,11 @@
#include "win.h"
/* clang-format off */
static const uint32_t _REF = 0x00000001;
static const uint32_t _REF_MASK = 0x0fffffff;
static const uint32_t _DESTROY = 0x10000000;
static const uint32_t _DESTROY_MASK = 0xf0000000;
static const uint32_t _POISON = 0x300DEAD0;
static const long _REF = (long) 0x00000001;
static const long _REF_MASK = (long) 0x0fffffff;
static const long _DESTROY = (long) 0x10000000;
static const long _DESTROY_MASK = (long) 0xf0000000;
static const long _POISON = (long) 0x300DEAD0;
/* clang-format on */
static HANDLE _keyed_event = NULL;
@ -42,28 +42,16 @@ static void _await_event(void* address) {
abort();
}
static inline uint32_t _sync_add_and_fetch(volatile uint32_t* target,
uint32_t value) {
static_assert(sizeof(*target) == sizeof(long), "");
return (uint32_t) InterlockedAdd((volatile long*) target, (long) value);
}
static inline uint32_t _sync_fetch_and_set(volatile uint32_t* target,
uint32_t value) {
static_assert(sizeof(*target) == sizeof(long), "");
return (uint32_t) InterlockedExchange((volatile long*) target, (long) value);
}
void reflock_ref(reflock_t* reflock) {
uint32_t state = _sync_add_and_fetch(&reflock->state, _REF);
long state = InterlockedAdd(&reflock->state, _REF);
unused_var(state);
assert((state & _DESTROY_MASK) == 0); /* Overflow or destroyed. */
}
void reflock_unref(reflock_t* reflock) {
uint32_t state = _sync_add_and_fetch(&reflock->state, 0 - _REF);
uint32_t ref_count = state & _REF_MASK;
uint32_t destroy = state & _DESTROY_MASK;
long state = InterlockedAdd(&reflock->state, -_REF);
long ref_count = state & _REF_MASK;
long destroy = state & _DESTROY_MASK;
unused_var(ref_count);
unused_var(destroy);
@ -75,8 +63,8 @@ void reflock_unref(reflock_t* reflock) {
}
void reflock_unref_and_destroy(reflock_t* reflock) {
uint32_t state = _sync_add_and_fetch(&reflock->state, _DESTROY - _REF);
uint32_t ref_count = state & _REF_MASK;
long state = InterlockedAdd(&reflock->state, _DESTROY - _REF);
long ref_count = state & _REF_MASK;
assert((state & _DESTROY_MASK) ==
_DESTROY); /* Underflow or already destroyed. */
@ -84,6 +72,6 @@ void reflock_unref_and_destroy(reflock_t* reflock) {
if (ref_count != 0)
_await_event(reflock);
state = _sync_fetch_and_set(&reflock->state, _POISON);
state = InterlockedExchange(&reflock->state, _POISON);
assert(state == _DESTROY);
}

2
src/reflock.h
View File

@ -24,7 +24,7 @@
#include "internal.h"
typedef struct reflock {
uint32_t state;
volatile long state; /* 32-bit Interlocked APIs operate on `long` values. */
} reflock_t;
WEPOLL_INTERNAL int reflock_global_init(void);