675 lines
24 KiB
Ada
675 lines
24 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
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-- --
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-- S Y S T E M . O S _ I N T E R F A C E --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1997-2011 Free Software Foundation, Inc. --
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-- --
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-- GNARL is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNARL was developed by the GNARL team at Florida State University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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-- The GNARL files that were developed for RTEMS are maintained by On-Line --
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-- Applications Research Corporation (http://www.oarcorp.com) in coopera- --
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-- tion with Ada Core Technologies Inc. and Florida State University. --
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-- --
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------------------------------------------------------------------------------
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-- This is the RTEMS version of this package.
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--
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-- RTEMS target names are of the form CPU-rtems.
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-- This implementation is designed to work on ALL RTEMS targets.
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-- The RTEMS implementation is primarily based upon the POSIX threads
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-- API but there are also bindings to GNAT/RTEMS support routines
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-- to insulate this code from C API specific details and, in some
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-- cases, obtain target architecture and BSP specific information
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-- that is unavailable at the time this package is built.
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-- This package encapsulates all direct interfaces to OS services
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-- that are needed by children of System.
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-- PLEASE DO NOT add any with-clauses to this package
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-- or remove the pragma Preelaborate.
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-- It is designed to be a bottom-level (leaf) package.
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with Interfaces.C;
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package System.OS_Interface is
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pragma Preelaborate;
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-- This interface assumes that "unsigned" is a 32-bit entity. This
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-- will correspond to RTEMS object ids.
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subtype rtems_id is Interfaces.C.unsigned;
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subtype int is Interfaces.C.int;
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subtype short is Interfaces.C.short;
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subtype long is Interfaces.C.long;
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subtype unsigned is Interfaces.C.unsigned;
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subtype unsigned_short is Interfaces.C.unsigned_short;
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subtype unsigned_long is Interfaces.C.unsigned_long;
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subtype unsigned_char is Interfaces.C.unsigned_char;
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subtype plain_char is Interfaces.C.plain_char;
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subtype size_t is Interfaces.C.size_t;
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-----------
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-- Errno --
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-----------
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function errno return int;
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pragma Import (C, errno, "__get_errno");
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EAGAIN : constant := 11;
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EINTR : constant := 4;
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EINVAL : constant := 22;
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ENOMEM : constant := 12;
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ETIMEDOUT : constant := 116;
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-------------
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-- Signals --
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-------------
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Num_HW_Interrupts : constant := 256;
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Max_HW_Interrupt : constant := Num_HW_Interrupts - 1;
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type HW_Interrupt is new int range 0 .. Max_HW_Interrupt;
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Max_Interrupt : constant := Max_HW_Interrupt;
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type Signal is new int range 0 .. Max_Interrupt;
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SIGXCPU : constant := 0; -- XCPU
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SIGHUP : constant := 1; -- hangup
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SIGINT : constant := 2; -- interrupt (rubout)
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SIGQUIT : constant := 3; -- quit (ASCD FS)
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SIGILL : constant := 4; -- illegal instruction (not reset)
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SIGTRAP : constant := 5; -- trace trap (not reset)
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SIGIOT : constant := 6; -- IOT instruction
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SIGABRT : constant := 6; -- used by abort, replace SIGIOT in the future
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SIGEMT : constant := 7; -- EMT instruction
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SIGFPE : constant := 8; -- floating point exception
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SIGKILL : constant := 9; -- kill (cannot be caught or ignored)
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SIGBUS : constant := 10; -- bus error
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SIGSEGV : constant := 11; -- segmentation violation
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SIGSYS : constant := 12; -- bad argument to system call
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SIGPIPE : constant := 13; -- write on a pipe with no one to read it
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SIGALRM : constant := 14; -- alarm clock
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SIGTERM : constant := 15; -- software termination signal from kill
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SIGUSR1 : constant := 16; -- user defined signal 1
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SIGUSR2 : constant := 17; -- user defined signal 2
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SIGADAABORT : constant := SIGABRT;
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type Signal_Set is array (Natural range <>) of Signal;
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Unmasked : constant Signal_Set := (SIGTRAP, SIGALRM, SIGEMT);
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Reserved : constant Signal_Set := (1 .. 1 => SIGKILL);
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type sigset_t is private;
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function sigaddset (set : access sigset_t; sig : Signal) return int;
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pragma Import (C, sigaddset, "sigaddset");
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function sigdelset (set : access sigset_t; sig : Signal) return int;
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pragma Import (C, sigdelset, "sigdelset");
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function sigfillset (set : access sigset_t) return int;
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pragma Import (C, sigfillset, "sigfillset");
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function sigismember (set : access sigset_t; sig : Signal) return int;
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pragma Import (C, sigismember, "sigismember");
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function sigemptyset (set : access sigset_t) return int;
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pragma Import (C, sigemptyset, "sigemptyset");
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type struct_sigaction is record
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sa_flags : int;
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sa_mask : sigset_t;
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sa_handler : System.Address;
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end record;
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pragma Convention (C, struct_sigaction);
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type struct_sigaction_ptr is access all struct_sigaction;
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SA_SIGINFO : constant := 16#02#;
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SA_ONSTACK : constant := 16#00#;
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-- SA_ONSTACK is not defined on RTEMS, but it is referred to in the POSIX
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-- implementation of System.Interrupt_Management. Therefore we define a
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-- dummy value of zero here so that setting this flag is a nop.
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SIG_BLOCK : constant := 1;
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SIG_UNBLOCK : constant := 2;
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SIG_SETMASK : constant := 3;
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SIG_DFL : constant := 0;
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SIG_IGN : constant := 1;
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function sigaction
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(sig : Signal;
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act : struct_sigaction_ptr;
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oact : struct_sigaction_ptr) return int;
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pragma Import (C, sigaction, "sigaction");
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----------
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-- Time --
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----------
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Time_Slice_Supported : constant Boolean := True;
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-- Indicates whether time slicing is supported (i.e SCHED_RR is supported)
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type timespec is private;
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type clockid_t is new int;
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CLOCK_REALTIME : constant clockid_t;
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CLOCK_MONOTONIC : constant clockid_t;
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function clock_gettime
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(clock_id : clockid_t;
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tp : access timespec) return int;
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pragma Import (C, clock_gettime, "clock_gettime");
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function To_Duration (TS : timespec) return Duration;
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pragma Inline (To_Duration);
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function To_Timespec (D : Duration) return timespec;
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pragma Inline (To_Timespec);
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-------------------------
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-- Priority Scheduling --
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-------------------------
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SCHED_FIFO : constant := 1;
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SCHED_RR : constant := 2;
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SCHED_OTHER : constant := 0;
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function To_Target_Priority
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(Prio : System.Any_Priority) return Interfaces.C.int;
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-- Maps System.Any_Priority to a POSIX priority
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-------------
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-- Process --
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-------------
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type pid_t is private;
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function kill (pid : pid_t; sig : Signal) return int;
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pragma Import (C, kill, "kill");
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function getpid return pid_t;
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pragma Import (C, getpid, "getpid");
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---------
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-- LWP --
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---------
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function lwp_self return System.Address;
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-- lwp_self does not exist on this thread library, revert to pthread_self
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-- which is the closest approximation (with getpid). This function is
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-- needed to share 7staprop.adb across POSIX-like targets.
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pragma Import (C, lwp_self, "pthread_self");
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-------------
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-- Threads --
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-------------
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type Thread_Body is access
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function (arg : System.Address) return System.Address;
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pragma Convention (C, Thread_Body);
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type pthread_t is private;
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subtype Thread_Id is pthread_t;
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type pthread_mutex_t is limited private;
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type pthread_rwlock_t is limited private;
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type pthread_cond_t is limited private;
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type pthread_attr_t is limited private;
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type pthread_mutexattr_t is limited private;
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type pthread_rwlockattr_t is limited private;
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type pthread_condattr_t is limited private;
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type pthread_key_t is private;
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No_Key : constant pthread_key_t;
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PTHREAD_CREATE_DETACHED : constant := 0;
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PTHREAD_SCOPE_PROCESS : constant := 0;
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PTHREAD_SCOPE_SYSTEM : constant := 1;
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-----------
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-- Stack --
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-----------
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type stack_t is record
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ss_sp : System.Address;
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ss_flags : int;
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ss_size : size_t;
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end record;
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pragma Convention (C, stack_t);
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function sigaltstack
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(ss : not null access stack_t;
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oss : access stack_t) return int;
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Alternate_Stack : aliased System.Address;
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-- This is a dummy definition, never used (Alternate_Stack_Size is null)
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Alternate_Stack_Size : constant := 0;
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-- No alternate signal stack is used on this platform
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Stack_Base_Available : constant Boolean := False;
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-- Indicates whether the stack base is available on this target.
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-- This allows us to share s-osinte.adb between all the FSU/RTEMS
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-- run time.
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-- Note that this value can only be true if pthread_t has a complete
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-- definition that corresponds exactly to the C header files.
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function Get_Stack_Base (thread : pthread_t) return Address;
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pragma Inline (Get_Stack_Base);
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-- returns the stack base of the specified thread.
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-- Only call this function when Stack_Base_Available is True.
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-- These two functions are only needed to share s-taprop.adb with
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-- FSU threads.
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function Get_Page_Size return size_t;
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function Get_Page_Size return Address;
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pragma Import (C, Get_Page_Size, "getpagesize");
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-- Returns the size of a page
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PROT_ON : constant := 0;
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PROT_OFF : constant := 0;
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function mprotect (addr : Address; len : size_t; prot : int) return int;
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pragma Import (C, mprotect);
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-----------------------------------------
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-- Nonstandard Thread Initialization --
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-----------------------------------------
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procedure pthread_init;
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-- FSU_THREADS requires pthread_init, which is nonstandard
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-- and this should be invoked during the elaboration of s-taprop.adb
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--
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-- RTEMS does not require this so we provide an empty Ada body.
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-------------------------
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-- POSIX.1c Section 3 --
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-------------------------
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function sigwait
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(set : access sigset_t;
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sig : access Signal) return int;
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pragma Import (C, sigwait, "sigwait");
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function pthread_kill
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(thread : pthread_t;
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sig : Signal) return int;
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pragma Import (C, pthread_kill, "pthread_kill");
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function pthread_sigmask
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(how : int;
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set : access sigset_t;
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oset : access sigset_t) return int;
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pragma Import (C, pthread_sigmask, "pthread_sigmask");
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----------------------------
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-- POSIX.1c Section 11 --
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----------------------------
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function pthread_mutexattr_init
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(attr : access pthread_mutexattr_t) return int;
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pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
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function pthread_mutexattr_destroy
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(attr : access pthread_mutexattr_t) return int;
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pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
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function pthread_mutex_init
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(mutex : access pthread_mutex_t;
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attr : access pthread_mutexattr_t) return int;
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pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
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function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
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pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
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function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
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pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
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function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
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pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
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function pthread_rwlockattr_init
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(attr : access pthread_rwlockattr_t) return int;
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pragma Import (C, pthread_rwlockattr_init, "pthread_rwlockattr_init");
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function pthread_rwlockattr_destroy
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(attr : access pthread_rwlockattr_t) return int;
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pragma Import (C, pthread_rwlockattr_destroy, "pthread_rwlockattr_destroy");
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PTHREAD_RWLOCK_PREFER_READER_NP : constant := 0;
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PTHREAD_RWLOCK_PREFER_WRITER_NP : constant := 1;
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PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP : constant := 2;
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function pthread_rwlockattr_setkind_np
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(attr : access pthread_rwlockattr_t;
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pref : int) return int;
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function pthread_rwlock_init
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(mutex : access pthread_rwlock_t;
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attr : access pthread_rwlockattr_t) return int;
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pragma Import (C, pthread_rwlock_init, "pthread_rwlock_init");
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function pthread_rwlock_destroy
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(mutex : access pthread_rwlock_t) return int;
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pragma Import (C, pthread_rwlock_destroy, "pthread_rwlock_destroy");
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function pthread_rwlock_rdlock (mutex : access pthread_rwlock_t) return int;
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pragma Import (C, pthread_rwlock_rdlock, "pthread_rwlock_rdlock");
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function pthread_rwlock_wrlock (mutex : access pthread_rwlock_t) return int;
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pragma Import (C, pthread_rwlock_wrlock, "pthread_rwlock_wrlock");
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function pthread_rwlock_unlock (mutex : access pthread_rwlock_t) return int;
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pragma Import (C, pthread_rwlock_unlock, "pthread_rwlock_unlock");
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function pthread_condattr_init
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(attr : access pthread_condattr_t) return int;
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pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
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function pthread_condattr_destroy
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(attr : access pthread_condattr_t) return int;
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pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
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function pthread_cond_init
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(cond : access pthread_cond_t;
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attr : access pthread_condattr_t) return int;
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pragma Import (C, pthread_cond_init, "pthread_cond_init");
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function pthread_cond_destroy (cond : access pthread_cond_t) return int;
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pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
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function pthread_cond_signal (cond : access pthread_cond_t) return int;
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pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
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function pthread_cond_wait
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(cond : access pthread_cond_t;
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mutex : access pthread_mutex_t) return int;
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pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
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function pthread_cond_timedwait
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(cond : access pthread_cond_t;
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mutex : access pthread_mutex_t;
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abstime : access timespec) return int;
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pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
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Relative_Timed_Wait : constant Boolean := False;
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-- pthread_cond_timedwait requires an absolute delay time
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--------------------------
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-- POSIX.1c Section 13 --
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--------------------------
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PTHREAD_PRIO_NONE : constant := 0;
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PTHREAD_PRIO_PROTECT : constant := 2;
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PTHREAD_PRIO_INHERIT : constant := 1;
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function pthread_mutexattr_setprotocol
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(attr : access pthread_mutexattr_t;
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protocol : int) return int;
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pragma Import (C, pthread_mutexattr_setprotocol);
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function pthread_mutexattr_setprioceiling
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(attr : access pthread_mutexattr_t;
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prioceiling : int) return int;
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pragma Import
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(C, pthread_mutexattr_setprioceiling,
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"pthread_mutexattr_setprioceiling");
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type struct_sched_param is record
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sched_priority : int;
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ss_low_priority : int;
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ss_replenish_period : timespec;
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ss_initial_budget : timespec;
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end record;
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pragma Convention (C, struct_sched_param);
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function pthread_setschedparam
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(thread : pthread_t;
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policy : int;
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param : access struct_sched_param) return int;
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pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
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function pthread_attr_setscope
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(attr : access pthread_attr_t;
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contentionscope : int) return int;
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pragma Import (C, pthread_attr_setscope, "pthread_attr_setscope");
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function pthread_attr_setinheritsched
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(attr : access pthread_attr_t;
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inheritsched : int) return int;
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pragma Import (C, pthread_attr_setinheritsched);
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function pthread_attr_setschedpolicy
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(attr : access pthread_attr_t;
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policy : int) return int;
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pragma Import (C, pthread_attr_setschedpolicy);
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function pthread_attr_setschedparam
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(attr : access pthread_attr_t;
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sched_param : int) return int;
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pragma Import (C, pthread_attr_setschedparam);
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function sched_yield return int;
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pragma Import (C, sched_yield, "sched_yield");
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---------------------------
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-- P1003.1c - Section 16 --
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---------------------------
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function pthread_attr_init (attributes : access pthread_attr_t) return int;
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pragma Import (C, pthread_attr_init, "pthread_attr_init");
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function pthread_attr_destroy
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(attributes : access pthread_attr_t) return int;
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pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
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function pthread_attr_setdetachstate
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(attr : access pthread_attr_t;
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detachstate : int) return int;
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pragma Import (C, pthread_attr_setdetachstate);
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function pthread_attr_setstacksize
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(attr : access pthread_attr_t;
|
|
stacksize : size_t) return int;
|
|
pragma Import (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
|
|
|
|
function pthread_create
|
|
(thread : access pthread_t;
|
|
attributes : access pthread_attr_t;
|
|
start_routine : Thread_Body;
|
|
arg : System.Address) return int;
|
|
pragma Import (C, pthread_create, "pthread_create");
|
|
|
|
procedure pthread_exit (status : System.Address);
|
|
pragma Import (C, pthread_exit, "pthread_exit");
|
|
|
|
function pthread_self return pthread_t;
|
|
pragma Import (C, pthread_self, "pthread_self");
|
|
|
|
--------------------------
|
|
-- POSIX.1c Section 17 --
|
|
--------------------------
|
|
|
|
function pthread_setspecific
|
|
(key : pthread_key_t;
|
|
value : System.Address) return int;
|
|
pragma Import (C, pthread_setspecific, "pthread_setspecific");
|
|
|
|
function pthread_getspecific (key : pthread_key_t) return System.Address;
|
|
pragma Import (C, pthread_getspecific, "pthread_getspecific");
|
|
|
|
type destructor_pointer is access procedure (arg : System.Address);
|
|
pragma Convention (C, destructor_pointer);
|
|
|
|
function pthread_key_create
|
|
(key : access pthread_key_t;
|
|
destructor : destructor_pointer) return int;
|
|
pragma Import (C, pthread_key_create, "pthread_key_create");
|
|
|
|
------------------------------------------------------------
|
|
-- Binary Semaphore Wrapper to Support Interrupt Tasks --
|
|
------------------------------------------------------------
|
|
|
|
type Binary_Semaphore_Id is new rtems_id;
|
|
|
|
function Binary_Semaphore_Create return Binary_Semaphore_Id;
|
|
pragma Import (
|
|
C,
|
|
Binary_Semaphore_Create,
|
|
"__gnat_binary_semaphore_create");
|
|
|
|
function Binary_Semaphore_Delete (ID : Binary_Semaphore_Id) return int;
|
|
pragma Import (
|
|
C,
|
|
Binary_Semaphore_Delete,
|
|
"__gnat_binary_semaphore_delete");
|
|
|
|
function Binary_Semaphore_Obtain (ID : Binary_Semaphore_Id) return int;
|
|
pragma Import (
|
|
C,
|
|
Binary_Semaphore_Obtain,
|
|
"__gnat_binary_semaphore_obtain");
|
|
|
|
function Binary_Semaphore_Release (ID : Binary_Semaphore_Id) return int;
|
|
pragma Import (
|
|
C,
|
|
Binary_Semaphore_Release,
|
|
"__gnat_binary_semaphore_release");
|
|
|
|
function Binary_Semaphore_Flush (ID : Binary_Semaphore_Id) return int;
|
|
pragma Import (
|
|
C,
|
|
Binary_Semaphore_Flush,
|
|
"__gnat_binary_semaphore_flush");
|
|
|
|
------------------------------------------------------------
|
|
-- Hardware Interrupt Wrappers to Support Interrupt Tasks --
|
|
------------------------------------------------------------
|
|
|
|
type Interrupt_Handler is access procedure (parameter : System.Address);
|
|
pragma Convention (C, Interrupt_Handler);
|
|
type Interrupt_Vector is new System.Address;
|
|
|
|
function Interrupt_Connect
|
|
(vector : Interrupt_Vector;
|
|
handler : Interrupt_Handler;
|
|
parameter : System.Address := System.Null_Address) return int;
|
|
pragma Import (C, Interrupt_Connect, "__gnat_interrupt_connect");
|
|
-- Use this to set up an user handler. The routine installs a
|
|
-- a user handler which is invoked after RTEMS has saved enough
|
|
-- context for a high-level language routine to be safely invoked.
|
|
|
|
function Interrupt_Vector_Get
|
|
(Vector : Interrupt_Vector) return Interrupt_Handler;
|
|
pragma Import (C, Interrupt_Vector_Get, "__gnat_interrupt_get");
|
|
-- Use this to get the existing handler for later restoral.
|
|
|
|
procedure Interrupt_Vector_Set
|
|
(Vector : Interrupt_Vector;
|
|
Handler : Interrupt_Handler);
|
|
pragma Import (C, Interrupt_Vector_Set, "__gnat_interrupt_set");
|
|
-- Use this to restore a handler obtained using Interrupt_Vector_Get.
|
|
|
|
function Interrupt_Number_To_Vector (intNum : int) return Interrupt_Vector;
|
|
-- Convert a logical interrupt number to the hardware interrupt vector
|
|
-- number used to connect the interrupt.
|
|
pragma Import (
|
|
C,
|
|
Interrupt_Number_To_Vector,
|
|
"__gnat_interrupt_number_to_vector"
|
|
);
|
|
|
|
private
|
|
|
|
type sigset_t is new int;
|
|
|
|
type pid_t is new int;
|
|
|
|
type time_t is new long;
|
|
|
|
type timespec is record
|
|
tv_sec : time_t;
|
|
tv_nsec : long;
|
|
end record;
|
|
pragma Convention (C, timespec);
|
|
|
|
CLOCK_REALTIME : constant clockid_t := 1;
|
|
CLOCK_MONOTONIC : constant clockid_t := 4;
|
|
|
|
type pthread_attr_t is record
|
|
is_initialized : int;
|
|
stackaddr : System.Address;
|
|
stacksize : int;
|
|
contentionscope : int;
|
|
inheritsched : int;
|
|
schedpolicy : int;
|
|
schedparam : struct_sched_param;
|
|
cputime_clocked_allowed : int;
|
|
detatchstate : int;
|
|
end record;
|
|
pragma Convention (C, pthread_attr_t);
|
|
|
|
type pthread_condattr_t is record
|
|
flags : int;
|
|
process_shared : int;
|
|
end record;
|
|
pragma Convention (C, pthread_condattr_t);
|
|
|
|
type pthread_mutexattr_t is record
|
|
is_initialized : int;
|
|
process_shared : int;
|
|
prio_ceiling : int;
|
|
protocol : int;
|
|
mutex_type : int;
|
|
recursive : int;
|
|
end record;
|
|
pragma Convention (C, pthread_mutexattr_t);
|
|
|
|
type pthread_rwlockattr_t is record
|
|
is_initialized : int;
|
|
process_shared : int;
|
|
end record;
|
|
pragma Convention (C, pthread_rwlockattr_t);
|
|
|
|
type pthread_t is new rtems_id;
|
|
|
|
type pthread_mutex_t is new rtems_id;
|
|
|
|
type pthread_rwlock_t is new rtems_id;
|
|
|
|
type pthread_cond_t is new rtems_id;
|
|
|
|
type pthread_key_t is new rtems_id;
|
|
|
|
No_Key : constant pthread_key_t := 0;
|
|
|
|
end System.OS_Interface;
|