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Write some lock contention tests

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This commit is contained in:
Justine Tunney 2022-06-16 09:06:09 -07:00
parent 42c38bc3e3
commit c06ffd458c
19 changed files with 205 additions and 76 deletions
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38
libc/intrin/spinlock.h
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@ -20,20 +20,19 @@
__atomic_store(__lock, &__x, __ATOMIC_RELEASE); \
})
#define _spinlock_tiny(lock) \
({ \
autotype(lock) __lock = (lock); \
while (_trylock(__lock)) { \
__builtin_ia32_pause(); \
} \
0; \
#define _spinlock_tiny(lock) \
({ \
while (_trylock(lock)) { \
__builtin_ia32_pause(); \
} \
0; \
})
#define _spinlock_cooperative(lock) \
({ \
autotype(lock) __lock = (lock); \
typeof(*__lock) __x; \
char __x; \
unsigned __tries = 0; \
char *__lock = (lock); \
for (;;) { \
__atomic_load(__lock, &__x, __ATOMIC_RELAXED); \
if (!__x && !_trylock(__lock)) { \
@ -47,6 +46,27 @@
0; \
})
#define _spinlock_cooperative_(lock) \
({ \
char __x; \
volatile int __i; \
unsigned __tries = 0; \
char *__lock = (lock); \
for (;;) { \
__atomic_load(__lock, &__x, __ATOMIC_RELAXED); \
if (!__x && !_trylock(__lock)) { \
break; \
} else if (__tries < 7) { \
for (__i = 0; __i != 1 << __tries; __i++) { \
} \
__tries++; \
} else { \
_spinlock_yield(); \
} \
} \
0; \
})
#define _trylock(lock) __atomic_test_and_set(lock, __ATOMIC_SEQ_CST)
void _spinlock_yield(void);