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PTHREAD_RWLOCKATTR_GE... BSD Library Functions Manual PTHREAD_RWLOCKATTR_GE...


NAME

     pthread_rwlockattr_getpshared -- get the process shared attribute


SYNOPSIS

     #include <pthread.h>

     int
     pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *attr,
         int *pshared);


DESCRIPTION

     The pthread_rwlockattr_getpshared() function is used to get the process
     shared setting of a read/write lock attribute object.  The setting is
     returned via pshared, and may be one of two values:

     PTHREAD_PROCESS_SHARED   Any thread of any process that has access to the
                              memory where the read/write lock resides can
                              manipulate the lock.

     PTHREAD_PROCESS_PRIVATE  Only threads created within the same process as
                              the thread that initialized the read/write lock
                              can manipulate the lock.  This is the default
                              value.


RETURN VALUES

     If successful, the pthread_rwlockattr_getpshared() function will return
     zero.  Otherwise an error number will be returned to indicate the error.


ERRORS

     The pthread_rwlockattr_getpshared() function may fail if:

     [EINVAL]           The value specified by attr is invalid.


SEE ALSO

     pthread_rwlock_init(3), pthread_rwlockattr_init(3),
     pthread_rwlockattr_setpshared(3)


STANDARDS

     The pthread_rwlockattr_getpshared() function is expected to conform to
     Version 2 of the Single UNIX Specification (``SUSv2'').


HISTORY

     The pthread_rwlockattr_getpshared() function first appeared in
     FreeBSD 3.0.

BSD                             March 22, 1999                             BSD

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