PTHREAD_RWLOCKATTR_GETPSHAREPDO(S3I)X Programmer's MPaTnHuRaElAD_RWLOCKATTR_GETPSHARED(3)



PPRROOLLOOGG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.


NNAAMMEE
       pthread_rwlockattr_getpshared, pthread_rwlockattr_setpshared -- get and
       set the process-shared attribute of the read-write lock attributes
       object

SSYYNNOOPPSSIISS
       #include <pthread.h>

       int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t
           *restrict _a_t_t_r, int *restrict _p_s_h_a_r_e_d);
       int pthread_rwlockattr_setpshared(pthread_rwlockattr_t *_a_t_t_r,
           int _p_s_h_a_r_e_d);

DDEESSCCRRIIPPTTIIOONN
       The _p_t_h_r_e_a_d___r_w_l_o_c_k_a_t_t_r___g_e_t_p_s_h_a_r_e_d() function shall obtain the value of
       the _p_r_o_c_e_s_s_-_s_h_a_r_e_d attribute from the initialized attributes object
       referenced by _a_t_t_r.  The _p_t_h_r_e_a_d___r_w_l_o_c_k_a_t_t_r___s_e_t_p_s_h_a_r_e_d() function shall
       set the _p_r_o_c_e_s_s_-_s_h_a_r_e_d attribute in an initialized attributes object
       referenced by _a_t_t_r.

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

       Additional attributes, their default values, and the names of the
       associated functions to get and set those attribute values are
       implementation-defined.

       The behavior is undefined if the value specified by the _a_t_t_r argument
       to _p_t_h_r_e_a_d___r_w_l_o_c_k_a_t_t_r___g_e_t_p_s_h_a_r_e_d() or _p_t_h_r_e_a_d___r_w_l_o_c_k_a_t_t_r___s_e_t_p_s_h_a_r_e_d()
       does not refer to an initialized read-write lock attributes object.

RREETTUURRNN VVAALLUUEE
       Upon successful completion, the _p_t_h_r_e_a_d___r_w_l_o_c_k_a_t_t_r___g_e_t_p_s_h_a_r_e_d()
       function shall return zero and store the value of the _p_r_o_c_e_s_s_-_s_h_a_r_e_d
       attribute of _a_t_t_r into the object referenced by the _p_s_h_a_r_e_d parameter.
       Otherwise, an error number shall be returned to indicate the error.

       If successful, the _p_t_h_r_e_a_d___r_w_l_o_c_k_a_t_t_r___s_e_t_p_s_h_a_r_e_d() function shall
       return zero; otherwise, an error number shall be returned to indicate
       the error.

EERRRROORRSS
       The _p_t_h_r_e_a_d___r_w_l_o_c_k_a_t_t_r___s_e_t_p_s_h_a_r_e_d() function may fail if:

       EEIINNVVAALL The new value specified for the attribute is outside the range
              of legal values for that attribute.

       These functions shall not return an error code of [[EEIINNTTRR]].

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

EEXXAAMMPPLLEESS
       None.

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       None.

RRAATTIIOONNAALLEE
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _p_t_h_r_e_a_d___r_w_l_o_c_k___d_e_s_t_r_o_y(), _p_t_h_r_e_a_d___r_w_l_o_c_k_a_t_t_r___d_e_s_t_r_o_y()

       The Base Definitions volume of POSIX.1-2008, <<pptthhrreeaadd..hh>>

CCOOPPYYRRIIGGHHTT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be obtained online
       at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .



IEEE/The Open Group                  2013     PTHREAD_RWLOCKATTR_GETPSHARED(3)
