DragonFly On-Line Manual Pages

PTHREAD_RWLOCKATTR... DragonFly Library Functions Manual PTHREAD_RWLOCKATTR...

NAME
     pthread_rwlockattr_getpshared -- get the process shared attribute

LIBRARY
     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS
     #include <pthread.h>

     int
     pthread_rwlockattr_getpshared(const pthread_rwlockattr_t * restrict attr,
         int * restrict 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_rwlockattr_init(3), pthread_rwlockattr_setpshared(3),
     pthread_rwlock_init(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.

DragonFly 5.1                  February 22, 2018                 DragonFly 5.1