Linux多线程锁属性设置方法
互斥锁是Linux下多线程资源保护的常用手段，但是在时序复杂的情况下，很容易会出现死锁的情况。
可以通过设置锁的属性，避免同一条线程重复上锁导致死锁的问题。
通过intpthread_mutexattr_settype(pthread_mutexattr_t*attr,inttype)接口设置
一般是以下四种属性：
PTHREAD_MUTEX_NORMAL Thistypeofmutexdoesnotdetectdeadlock.Athreadattemptingtorelockthismutexwithoutfirstunlockingitwilldeadlock.Attemptingtounlockamutexlockedbyadifferentthreadresultsinundefinedbehaviour.Attemptingtounlockanunlockedmutexresultsinundefinedbehaviour. PTHREAD_MUTEX_ERRORCHECK Thistypeofmutexprovideserrorchecking.Athreadattemptingtorelockthismutexwithoutfirstunlockingitwillreturnwithanerror.Athreadattemptingtounlockamutexwhichanotherthreadhaslockedwillreturnwithanerror.Athreadattemptingtounlockanunlockedmutexwillreturnwithanerror. PTHREAD_MUTEX_RECURSIVE Athreadattemptingtorelockthismutexwithoutfirstunlockingitwillsucceedinlockingthemutex.TherelockingdeadlockwhichcanoccurwithmutexesoftypePTHREAD_MUTEX_NORMALcannotoccurwiththistypeofmutex.Multiplelocksofthismutexrequirethesamenumberofunlockstoreleasethemutexbeforeanotherthreadcanacquirethemutex.Athreadattemptingtounlockamutexwhichanotherthreadhaslockedwillreturnwithanerror.Athreadattemptingtounlockanunlockedmutexwillreturnwithanerror. PTHREAD_MUTEX_DEFAULT Attemptingtorecursivelylockamutexofthistyperesultsinundefinedbehaviour.Attemptingtounlockamutexofthistypewhichwasnotlockedbythecallingthreadresultsinundefinedbehaviour.Attemptingtounlockamutexofthistypewhichisnotlockedresultsinundefinedbehaviour.Animplementationisallowedtomapthismutextooneoftheothermutextypes.
这里主要指同一条线程重复上锁，不同线程上锁，无论设置什么属性，当锁已经被锁定后都会互斥阻塞。
使用PTHREAD_MUTEX_RECURSIVE属性，当同一条线程在没有解锁的情况下尝试再次锁定会返回成功。
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