sync.h

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#pragma once
 
#include <stdatomic.h>
#include <stdbool.h>
#include <stdint.h>
 
typedef atomic_flag spinlock_t;
 
#define spin_init(lck_p) spin_unlock(lck_p)
 
#if defined(__x86_64__) || defined(__i386__)
#define spin_pause() __builtin_ia32_pause()
#else
#define spin_pause()
#endif
 
#define spin_lock(lck_p)                                                \
__extension__({                                                         \
        while(atomic_flag_test_and_set_explicit((lck_p),                \
                memory_order_acquire))                                  \
                spin_pause();                                           \
})
 
#define spin_trylock(lck_p)                                             \
        !atomic_flag_test_and_set_explicit((lck_p), memory_order_acquire)
 
#define spin_unlock(lck_p)                                              \
        atomic_flag_clear_explicit((lck_p), memory_order_release)
 
extern bool sync_thread_barrier(void);