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#ifndef OPTIONAL_MUTEX_H_
#define OPTIONAL_MUTEX_H_
#include <pthread.h>
/**
* optional_mutex_lock(mutex):
* If OPTIONAL_MUTEX_PTHREAD_YES is defined, call pthread_mutex_lock();
* if OPTIONAL_MUTEX_PTHREAD_NO is defined, do nothing.
*/
int optional_mutex_lock(pthread_mutex_t *);
/**
* optional_mutex_unlock(mutex):
* If OPTIONAL_MUTEX_PTHREAD_YES is defined, call pthread_mutex_unlock();
* if OPTIONAL_MUTEX_PTHREAD_NO is defined, do nothing.
*/
int optional_mutex_unlock(pthread_mutex_t *);
#endif /* !OPTIONAL_MUTEX_H_ */
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