UnityAndroidIl2cppPatchDemo-libboostrap/pthread_spin_lock.h at master · noodle1983/UnityAndroidIl2cppPatchDemo-libboostrap · GitHub

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//
// Created by lizhen on 2020/11/18.
//

#ifndef PTHREAD_SPIN_LOCK_SHIM
#define PTHREAD_SPIN_LOCK_SHIM

#include <errno.h>
#include <pthread.h>

#if __ANDROID_API__ < 24
typedef int pthread_spinlock_t;

static inline int pthread_spin_init(pthread_spinlock_t *lock, int pshared) {
	__asm__ __volatile__ ("" ::: "memory");
	*lock = 0;
	return 0;
}

static inline int pthread_spin_destroy(pthread_spinlock_t *lock) {
	return 0;
}

static inline int pthread_spin_lock(pthread_spinlock_t *lock) {
	while (1) {
        if (__sync_bool_compare_and_swap(lock, 0, 1))
            return 0;
	}
}

static inline int pthread_spin_trylock(pthread_spinlock_t *lock) {
	if (__sync_bool_compare_and_swap(lock, 0, 1)) {
		return 0;
	}
	return EBUSY;
}

static inline int pthread_spin_unlock(pthread_spinlock_t *lock) {
	__sync_sub_and_fetch(lock, 1);
	return 0;
}
#endif
#endif