背景
在Linux Arm kernel实现原子读写64位数据；文章来源地址https://www.toymoban.com/news/detail-771601.html
接口代码
#include <linux/atomic.h>
atomic64_t my_atomic_var = ATOMIC64_INIT(0);
void atomic_write_64(atomic64_t *v, int64_t new_value) {
atomic64_set(v, new_value);
}
int64_t atomic_read_64(atomic64_t *v) {
return atomic64_read(v);
}
使用自旋锁
#include <linux/spinlock.h>
spinlock_t my_lock = SPIN_LOCK_UNLOCKED;
uint64_t my_shared_var = 0;
void write_64(uint64_t new_value) {
spin_lock(&my_lock);
my_shared_var = new_value;
spin_unlock(&my_lock);
}
uint64_t read_64(void) {
uint64_t value;
spin_lock(&my_lock);
value = my_shared_var;
spin_unlock(&my_lock);
return value;
}
使用读写锁
#include <linux/rwlock.h>
rwlock_t my_rwlock = RW_LOCK_UNLOCKED;
uint64_t my_shared_var = 0;
void write_64(uint64_t new_value) {
write_lock(&my_rwlock);
my_shared_var = new_value;
write_unlock(&my_rwlock);
}
uint64_t read_64(void) {
uint64_t value;
read_lock(&my_rwlock);
value = my_shared_var;
read_unlock(&my_rwlock);
return value;
}
文章来源：https://www.toymoban.com/news/detail-771601.html
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