sched.h(3)                 POSIX Programmer's Manual                sched.h(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
       sched.h -- execution scheduling

SSYYNNOOPPSSIISS
       #include <sched.h>

DDEESSCCRRIIPPTTIIOONN
       The _<_s_c_h_e_d_._h_> header shall define the ppiidd__tt type as described in
       _<_s_y_s_/_t_y_p_e_s_._h_>.

       The _<_s_c_h_e_d_._h_> header shall define the ttiimmee__tt type as described in
       _<_s_y_s_/_t_y_p_e_s_._h_>.

       The _<_s_c_h_e_d_._h_> header shall define the ttiimmeessppeecc structure as described
       in _<_t_i_m_e_._h_>.

       The _<_s_c_h_e_d_._h_> header shall define the sscchheedd__ppaarraamm structure, which
       shall include the scheduling parameters required for implementation of
       each supported scheduling policy. This structure shall include at least
       the following member:

           iinntt       sscchheedd__pprriioorriittyy        Process or thread execution scheduling priority.

       The sscchheedd__ppaarraamm structure defined in _<_s_c_h_e_d_._h_> shall include the
       following members in addition to those specified above:

           iinntt             sscchheedd__ssss__llooww__pprriioorriittyy Low scheduling priority for
                                                 sporadic server.
           struct timespec sched_ss_repl_period  Replenishment period for
                                                 sporadic server.
           struct timespec sched_ss_init_budget  Initial budget for sporadic server.
           int             sched_ss_max_repl     Maximum pending replenishments for
                                                 sporadic server.

       Each process or thread is controlled by an associated scheduling policy
       and priority. Associated with each policy is a priority range. Each
       policy definition specifies the minimum priority range for that policy.
       The priority ranges for each policy may overlap the priority ranges of
       other policies.

       Four scheduling policies are defined; others may be defined by the
       implementation. The four standard policies are indicated by the values
       of the following symbolic constants:

       SCHED_FIFO    First in-first out (FIFO) scheduling policy.

       SCHED_RR      Round robin scheduling policy.

       SCHED_SPORADIC
                     Sporadic server scheduling policy.

       SCHED_OTHER   Another scheduling policy.

       The values of these constants are distinct.

       The following shall be declared as functions and may also be defined as
       macros. Function prototypes shall be provided.

           iinntt    sscchheedd__ggeett__pprriioorriittyy__mmaaxx((iinntt));;
           iinntt    sscchheedd__ggeett__pprriioorriittyy__mmiinn((iinntt));;
           iinntt    sscchheedd__ggeettppaarraamm((ppiidd__tt,, ssttrruucctt sscchheedd__ppaarraamm **));;
           iinntt    sscchheedd__ggeettsscchheedduulleerr((ppiidd__tt));;
           iinntt    sscchheedd__rrrr__ggeett__iinntteerrvvaall((ppiidd__tt,, ssttrruucctt ttiimmeessppeecc **));;
           iinntt    sscchheedd__sseettppaarraamm((ppiidd__tt,, ccoonnsstt ssttrruucctt sscchheedd__ppaarraamm **));;
           iinntt    sscchheedd__sseettsscchheedduulleerr((ppiidd__tt,, iinntt,, ccoonnsstt ssttrruucctt sscchheedd__ppaarraamm **));;
           iinntt    sscchheedd__yyiieelldd((vvooiidd));;

       Inclusion of the _<_s_c_h_e_d_._h_> header may make visible all symbols from the
       _<_t_i_m_e_._h_> header.

       _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_.

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       None.

RRAATTIIOONNAALLEE
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       <<ssyyss__ttyyppeess..hh>>, <<ttiimmee..hh>>

       The System Interfaces volume of POSIX.1-2008, _s_c_h_e_d___g_e_t___p_r_i_o_r_i_t_y___m_a_x(),
       _s_c_h_e_d___g_e_t_p_a_r_a_m(), _s_c_h_e_d___g_e_t_s_c_h_e_d_u_l_e_r(), _s_c_h_e_d___r_r___g_e_t___i_n_t_e_r_v_a_l(),
       _s_c_h_e_d___s_e_t_p_a_r_a_m(), _s_c_h_e_d___s_e_t_s_c_h_e_d_u_l_e_r(), _s_c_h_e_d___y_i_e_l_d()

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                           sched.h(3)
