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#ifndef UTIL_MUTEX_H
#define UTIL_MUTEX_H
#define NULL_PID 0
#define SYS_PID 1
#define SCHED_PID 2
struct Mutex {
unsigned long* addr;
unsigned long pid;
} __attribute__((packed, aligned(4)));;
unsigned char lock_mutex(struct Mutex*, unsigned long);
unsigned char release_mutex(struct Mutex*, unsigned long);
#endif
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