pthread_mutexattr_init(3T)												pthread_mutexattr_init(3T)

NAME
pthread_mutexattr_init(), pthread_mutexattr_destroy() - initialize or destroy a mutex attributes object SYNOPSIS
PARAMETERS
attr Pointer to the mutex attributes object to be initialized or destroyed. DESCRIPTION
initializes the mutex attributes object attr with the default values for all attributes. The attributes object describes a mutex in detail and is passed to the mutex initialization function. When a mutex attributes object is used to initialize a mutex, the values of the individual attributes determine the characteristics of the new mutex. Attributes objects act like additional parameters to object initialization. A single attributes object can be used in multiple calls to the function When a mutex is initialized with an attributes object, the attributes are, in effect, copied into the mutex. Consequently, any change to the attributes object will not affect any previously initialized mutexes. Once all mutexes needing a specific attributes object have been initialized, the attributes object is no longer needed. The mutex attributes and their default values are: The default value is The default value is If an initialized mutex attributes object is reinitialized, undefined behavior results. destroys the mutex attributes object attr. The destroyed mutex attributes object ceases to exist and its resources are reclaimed. Using attr after it has been destroyed results in undefined behavior. A destroyed mutex attributes object can be reinitialized using the func- tion. Mutexes that have been already initialized using this attributes object are not affected by the destruction of the mutex attributes object. RETURN VALUE
Upon successful completion, and return zero. Otherwise, an error number is returned to indicate the error (the variable is not set). ERRORS
For each of the following conditions, if the condition is detected, the and functions return the corresponding error number: [ENOMEM] There is insufficient memory available in which to initialize attr. [EINVAL] The value specified by attr is invalid. AUTHOR
and were derived from the IEEE POSIX P1003.1c standard. SEE ALSO
pthread_create(3T), pthread_mutexattr_getpshared(3T), pthread_mutexattr_setpshared(3T), pthread_mutexattr_gettype(3T), pthread_mutex- attr_settype(3T), pthread_mutex_init(3T). STANDARDS CONFORMANCE
Pthread Library pthread_mutexattr_init(3T)