关于pthread_mutexattr_settype

最近在搞linux, 在用到mutex时, 一下没注意这个mutexattr, 在查死锁上浪费了不少时间...

现在做记录怕以后又忘了...

Name

pthread_mutexattr_gettype, pthread_mutexattr_settype - get and set the mutex type attribute

Synopsis

#include <pthread.h >

int pthread_mutexattr_gettype(const pthread_mutexattr_t *restrict attr ,
int *restrict type );
int pthread_mutexattr_settype(pthread_mutexattr_t *attr , int type );

Description

The type of mutex is contained in the type attribute of the mutex attributes. Valid mutex types include:

PTHREAD_MUTEX_NORMAL

This type of mutex does not detect deadlock. A thread attempting to relock this mutex without first unlocking it shall deadlock. Attempting to unlock a mutex locked by a different thread results in undefined behavior. Attempting to unlock an unlocked mutex results in undefined behavior.

PTHREAD_MUTEX_ERRORCHECK

This type of mutex provides error checking. A thread attempting to relock this mutex without first unlocking it shall return with an error. A thread attempting to unlock a mutex which another thread has locked shall return with an error. A thread attempting to unlock an unlocked mutex shall return with an error.

PTHREAD_MUTEX_RECURSIVE

A thread attempting to relock this mutex without first unlocking it shall succeed in locking the mutex. The relocking deadlock which can occur with mutexes of type PTHREAD_MUTEX_NORMAL cannot occur with this type of mutex. Multiple locks of this mutex shall require the same number of unlocks to release the mutex before another thread can acquire the mutex. A thread attempting to unlock a mutex which another thread has locked shall return with an error. A thread attempting to unlock an unlocked mutex shall return with an error.

PTHREAD_MUTEX_DEFAULT

Attempting to recursively lock a mutex of this type results in undefined behavior. Attempting to unlock a mutex of this type which was not locked by the calling thread results in undefined behavior. Attempting to unlock a mutex of this type which is not locked results in undefined behavior. An implementation may map this mutex to one of the other mutex types.

Return Value

Upon successful completion, the pthread_mutexattr_gettype () function shall return zero and store the value of the type attribute of attr into the object referenced by the type parameter. Otherwise, an error shall be returned to indicate the error.

If successful, the pthread_mutexattr_settype () function shall return zero; otherwise, an error number shall be returned to indicate the error.

Errors

The pthread_mutexattr_settype () function shall fail if:

EINVAL

The value type is invalid.

The pthread_mutexattr_gettype () and pthread_mutexattr_settype () functions may fail if:

最后

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