POSIX互斥锁

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pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;

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int pthread_mutex_init (pthread_mutex_t * mutex, const pthread_mutexattr_t * attr)

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struct pthread_mutexattr_t
{
enum lock_type
// 使用pthread_mutexattr_settype来更改
{
PTHREAD_MUTEX_TIMED_NP [default]//当一个线程加锁后，其余请求锁的线程形成等待队列，在解锁后按优先级获得锁。
PTHREAD_MUTEX_ADAPTIVE_NP
// 动作最简单的锁类型，解锁后所有线程重新竞争。
PTHREAD_MUTEX_RECURSIVE_NP
// 允许同一线程对同一锁成功获得多次。当然也要解锁多次。其余线程在解锁时重新竞争。
PTHREAD_MUTEX_ERRORCHECK_NP
// 若同一线程请求同一锁，返回EDEADLK，否则与PTHREAD_MUTEX_TIMED_NP动作相同。
} type;
} attr;
// 若NULL则使用默认属性

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int pthread_mutex_destroy (pthread_mutex_t * mutex)

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int pthread_mutexattr_init (pthread_mutexattr_t * attr);
int pthread_mutexattr_destroy (pthread_mutexattr_t * attr);
int pthread_mutexattr_getpshared (const pthread_mutexattr_t * attr, int * pshared);
int pthread_mutexattr_setpshared (pthread_mutexattr_t * attr, int pshared);
int pthread_mutexattr_settype (pthread_mutexattr_t * attr, int kind);
int pthread_mutexattr_gettype (pthread_mutexattr_t * attr, int * kind);

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int pthread_mutex_lock (pthread_mutex_t * mutex);
int pthread_mutex_unlock (pthread_mutex_t * mutex);
int pthread_mutex_trylock (pthread_mutex_t * mutex);//在锁已经被占据时返回EBUSY而不是挂起等待