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31 lines
438 B
C
31 lines
438 B
C
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typedef struct {
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int lock;
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} ngx_mutex_t;
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static inline int ngx_spin_lock(ngx_mutex_t *m, int count)
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{
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int lock;
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__asm__ __volatile("
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get_lock:
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mov $1, %1
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xchg %1, %2
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cmp $0, %1
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jne spin_lock
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spin_lock:
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cmp $0, %3
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je failed
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dec %3
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rep nop
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cmp $0, %2
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jne spin_lock
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": "=q" (lock), "m" (m->lock), "q" (count));
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}
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