Manual Pages for UNIX Operating System command usage for man pthread_mutexattr_setpshared

Standard C Library Functions     pthread_mutexattr_getpshared(3C)



NAME
     pthread_mutexattr_getpshared, pthread_mutexattr_setpshared -
     get or set process-shared attribute

SYNOPSIS
     cc -mt [ flag... ] file... -lpthread [ library... ]
     #include 

     int pthread_mutexattr_getpshared(
          const pthread_mutexattr_t *restrict attr,
          int *restrict pshared);


     int pthread_mutexattr_setpshared(pthread_mutexattr_t *attr,
          int pshared);


DESCRIPTION
     The  pthread_mutexattr_getpshared()  function  obtains   the
     value  of  the  process-shared attribute from the attributes
     object        referenced        by         attr.         The
     pthread_mutexattr_setpshared()  function  is used to set the
     process-shared attribute in an initialized attributes object
     referenced by attr.


     The     process-shared     attribute     is      set      to
     PTHREAD_PROCESS_SHARED to permit a mutex to be operated upon
     by any thread that has access to the memory where the  mutex
     is  allocated, even if the mutex is allocated in memory that
     is shared  by  multiple  processes.  If  the  process-shared
     attribute  is   PTHREAD_PROCESS_PRIVATE, the mutex will only
     be operated upon by threads created within the same  process
     as  the  thread  that  initialized  the mutex; if threads of
     differing processes attempt to operate on such a mutex,  the
     behavior is undefined. The default value of the attribute is
     PTHREAD_PROCESS_PRIVATE.

RETURN VALUES
     Upon successful  completion,  pthread_mutexattr_getpshared()
     returns  0 and stores the value of the process-shared attri-
     bute of attr into  the  object  referenced  by  the  pshared
     parameter.  Otherwise,  an error number is returned to indi-
     cate the error.


     Upon successful  completion,  pthread_mutexattr_setpshared()
     returns   0. Otherwise, an error number is returned to indi-
     cate the error.

ERRORS




SunOS 5.11          Last change: 23 Mar 2005                    1






Standard C Library Functions     pthread_mutexattr_getpshared(3C)



     The            pthread_mutexattr_getpshared()            and
     pthread_mutexattr_setpshared() functions may fail if:

     EINVAL    The value specified by attr is invalid.



     The pthread_mutexattr_setpshared() function may fail if:

     EINVAL    The new value specified for the attribute is  out-
               side the range of legal values for that attribute.


ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Interface Stability         | Committed                   |
    |_____________________________|_____________________________|
    | MT-Level                    | MT-Safe                     |
    |_____________________________|_____________________________|
    | Standard                    | See standards(5).           |
    |_____________________________|_____________________________|


SEE ALSO
     pthread_create(3C),                  pthread_mutex_init(3C),
     pthread_mutexattr_init(3C),   pthread_cond_init(3C),  attri-
     butes(5), standards(5)





















SunOS 5.11          Last change: 23 Mar 2005                    2