pthread_mutexattr_init(3)pthread_mutexattr_init(3)NAMEpthread_mutexattr_init - Initializes a mutex attributes object
pthread_mutexattr_t *attr );
DECthreads POSIX 1003.1c Library (libpthread.so)
Interfaces documented on this reference page conform to industry stan‐
dards as follows:
IEEE Std 1003.1c-1995, POSIX System Application Program Interface
Address of the mutex attributes object to be initialized.
This routine initializes the mutex attributes object specified by the
attr argument with a set of default values. A mutex attributes object
is used to specify the attributes of one or more mutexes when they are
created. The attributes object created by this routine is used only in
calls to the pthread_mutex_init(3) routine.
When a mutex attributes object is used to create a mutex, the values of
the individual attributes determine the characteristics of the new
mutex. Thus, attributes objects act as additional arguments to mutex
creation. Changing individual attributes in an attributes object does
not affect any mutexes that were previously created using that
You can use the same mutex attributes object in successive calls to
pthread_mutex_init(3), from any thread. If multiple threads can change
attributes in a shared mutex attributes object, your program must use a
mutex to protect the integrity of the attributes object's contents.
Results are undefined if this routine is called and the attr argument
specifies a mutex attributes object that is already initialized.
If an error condition occurs, this routine returns an integer value
indicating the type of error. Possible return values are as follows:
Successful completion. Insufficient memory to create the mutex
Functions: pthread_mutexattr_destroy(3), pthread_mutexattr_gettype(3),
Manuals: Guide to DECthreads and Programmer's Guide