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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . O S _ I N T E R F A C E --
-- --
-- S p e c --
-- --
-- Copyright (C) 1991-1994, Florida State University --
-- Copyright (C) 1995-2021, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNARL was developed by the GNARL team at Florida State University. --
-- Extensive contributions were provided by Ada Core Technologies, Inc. --
-- --
------------------------------------------------------------------------------
-- This is a LynxOS-178 Elf (POSIX-8 Threads) version of this package
-- This package encapsulates all direct interfaces to OS services that are
-- needed by the tasking run-time (libgnarl).
-- PLEASE DO NOT add any with-clauses to this package or remove the pragma
-- Preelaborate. This package is designed to be a bottom-level (leaf) package.
with Ada.Unchecked_Conversion;
with Interfaces.C;
with System.Multiprocessors;
with System.Parameters;
package System.OS_Interface is
pragma Preelaborate;
subtype int is Interfaces.C.int;
subtype short is Interfaces.C.short;
subtype long is Interfaces.C.long;
subtype unsigned is Interfaces.C.unsigned;
subtype unsigned_short is Interfaces.C.unsigned_short;
subtype unsigned_long is Interfaces.C.unsigned_long;
subtype unsigned_char is Interfaces.C.unsigned_char;
subtype plain_char is Interfaces.C.plain_char;
subtype size_t is Interfaces.C.size_t;
subtype int64 is Interfaces.Integer_64;
-----------
-- Errno --
-----------
function errno return int;
pragma Import (C, errno, "__get_errno");
EAGAIN : constant := 11;
EINTR : constant := 4;
EINVAL : constant := 22;
ENOMEM : constant := 12;
ETIMEDOUT : constant := 60;
-- Error codes
-------------
-- Signals --
-------------
Max_Interrupt : constant := 63;
-- Max_Interrupt is the number of OS signals, as defined in:
--
-- /usr/include/sys/signal.h
--
-- The lowest numbered signal is 1, but 0 is a valid argument to some
-- library functions, e.g. kill(2). However, 0 is not just another signal:
-- For instance 'I in Signal' and similar should be used with caution.
type Signal is new int range 0 .. Max_Interrupt;
for Signal'Size use int'Size;
SIGHUP : constant := 1; -- hangup
SIGINT : constant := 2; -- interrupt (rubout)
SIGQUIT : constant := 3; -- quit (ASCD FS)
SIGILL : constant := 4; -- illegal instruction (not reset)
SIGTRAP : constant := 5; -- trace trap (not reset)
SIGBRK : constant := 6; -- break
SIGIOT : constant := 6; -- IOT instruction
SIGABRT : constant := 6; -- used by abort, replace SIGIOT in future
SIGCORE : constant := 7; -- kill with core dump
SIGEMT : constant := 7; -- EMT instruction
SIGFPE : constant := 8; -- floating point exception
SIGKILL : constant := 9; -- kill (cannot be caught or ignored)
SIGBUS : constant := 10; -- bus error
SIGSEGV : constant := 11; -- segmentation violation
SIGSYS : constant := 12; -- bad argument to system call
SIGPIPE : constant := 13; -- write on a pipe with no one to read it
SIGALRM : constant := 14; -- alarm clock
SIGTERM : constant := 15; -- software termination signal from kill
SIGURG : constant := 16; -- urgent condition on IO channel
SIGSTOP : constant := 17; -- stop (cannot be caught or ignored)
SIGTSTP : constant := 18; -- user stop requested from tty
SIGCONT : constant := 19; -- stopped process has been continued
SIGCLD : constant := 20; -- alias for SIGCHLD
SIGCHLD : constant := 20; -- child status change
SIGTTIN : constant := 21; -- background tty read attempted
SIGTTOU : constant := 22; -- background tty write attempted
SIGIO : constant := 23; -- I/O possible (Solaris SIGPOLL alias)
SIGPOLL : constant := 23; -- pollable event occurred
SIGTHREADKILL : constant := 24; -- Reserved by LynxOS runtime
SIGXCPU : constant := 24; -- CPU time limit exceeded
SIGXFSZ : constant := 25; -- filesize limit exceeded
SIGVTALRM : constant := 26; -- virtual timer expired
SIGPROF : constant := 27; -- profiling timer expired
SIGWINCH : constant := 28; -- window size change
SIGLOST : constant := 29; -- SUN 4.1 compatibility
SIGUSR1 : constant := 30; -- user defined signal 1
SIGUSR2 : constant := 31; -- user defined signal 2
SIGPRIO : constant := 32;
-- Sent to a process with its priority or group is changed
SIGADAABORT : constant := SIGABRT;
-- Change this if you want to use another signal for task abort. SIGTERM
-- might be a good one.
type Signal_Set is array (Natural range <>) of Signal;
Unmasked : constant Signal_Set :=
(SIGTRAP, SIGTTIN, SIGTTOU, SIGTSTP, SIGPROF, SIGTHREADKILL);
Reserved : constant Signal_Set := (SIGABRT, SIGKILL, SIGSTOP, SIGPRIO);
type sigset_t is private;
function sigaddset (set : access sigset_t; sig : Signal) return int;
pragma Import (C, sigaddset, "sigaddset");
function sigdelset (set : access sigset_t; sig : Signal) return int;
pragma Import (C, sigdelset, "sigdelset");
function sigfillset (set : access sigset_t) return int;
pragma Import (C, sigfillset, "sigfillset");
function sigismember (set : access sigset_t; sig : Signal) return int;
pragma Import (C, sigismember, "sigismember");
function sigemptyset (set : access sigset_t) return int;
pragma Import (C, sigemptyset, "sigemptyset");
type struct_sigaction is record
sa_handler : System.Address;
sa_mask : sigset_t;
sa_flags : int;
end record;
pragma Convention (C, struct_sigaction);
type struct_sigaction_ptr is access all struct_sigaction;
SA_SIGINFO : constant := 16#80#;
SA_ONSTACK : constant := 16#00#;
-- SA_ONSTACK is not defined on LynxOS, but it is referred to in the POSIX
-- implementation of System.Interrupt_Management. Therefore we define a
-- dummy value of zero here so that setting this flag is a nop.
SIG_BLOCK : constant := 0;
SIG_UNBLOCK : constant := 1;
SIG_SETMASK : constant := 2;
SIG_DFL : constant := 0;
SIG_IGN : constant := 1;
function sigaction
(sig : Signal;
act : struct_sigaction_ptr;
oact : struct_sigaction_ptr) return int;
pragma Import (C, sigaction, "sigaction");
----------
-- Time --
----------
Time_Slice_Supported : constant Boolean := True;
-- Indicates whether time slicing is supported
type timespec is private;
type clockid_t is new int;
function clock_gettime
(clock_id : clockid_t;
tp : access timespec) return int;
pragma Import (C, clock_gettime, "clock_gettime");
function clock_getres
(clock_id : clockid_t;
res : access timespec) return int;
pragma Import (C, clock_getres, "clock_getres");
function To_Duration (TS : timespec) return Duration;
pragma Inline (To_Duration);
function To_Timespec (D : Duration) return timespec;
pragma Inline (To_Timespec);
type struct_timezone is record
tz_minuteswest : int;
tz_dsttime : int;
end record;
pragma Convention (C, struct_timezone);
type struct_timezone_ptr is access all struct_timezone;
type struct_timeval is private;
-------------------------
-- Priority Scheduling --
-------------------------
SCHED_RR : constant := 16#100_000#;
SCHED_FIFO : constant := 16#200_000#;
SCHED_OTHER : constant := 16#400_000#;
function To_Target_Priority
(Prio : System.Any_Priority) return Interfaces.C.int;
-- Maps System.Any_Priority to a POSIX priority
-------------
-- Process --
-------------
type pid_t is private;
function kill (pid : pid_t; sig : Signal) return int;
pragma Import (C, kill, "kill");
function getpid return pid_t;
pragma Import (C, getpid, "getpid");
---------
-- LWP --
---------
type pthread_t is private;
function lwp_self return pthread_t;
pragma Import (C, lwp_self, "pthread_self");
-------------
-- Threads --
-------------
type Thread_Body is access
function (arg : System.Address) return System.Address;
pragma Convention (C, Thread_Body);
function Thread_Body_Access is new
Ada.Unchecked_Conversion (System.Address, Thread_Body);
subtype Thread_Id is pthread_t;
type pthread_mutex_t is limited private;
type pthread_cond_t is limited private;
type pthread_attr_t is limited private;
type pthread_mutexattr_t is limited private;
type pthread_condattr_t is limited private;
type pthread_key_t is private;
PTHREAD_CREATE_DETACHED : constant := 1;
PTHREAD_CREATE_JOINABLE : constant := 0;
PTHREAD_SCOPE_PROCESS : constant := 0; -- not supported by LynxOS178
PTHREAD_SCOPE_SYSTEM : constant := 1;
-- Read/Write lock not supported on LynxOS. To add support both types
-- pthread_rwlock_t and pthread_rwlockattr_t must properly be defined
-- with the associated routines pthread_rwlock_[init/destroy] and
-- pthread_rwlock_[rdlock/wrlock/unlock].
subtype pthread_rwlock_t is pthread_mutex_t;
subtype pthread_rwlockattr_t is pthread_mutexattr_t;
-----------
-- Stack --
-----------
type stack_t is record
ss_sp : System.Address;
ss_flags : int;
ss_size : size_t;
end record;
pragma Convention (C, stack_t);
function sigaltstack
(ss : not null access stack_t;
oss : access stack_t) return int;
pragma Import (C, sigaltstack, "sigaltstack");
-- Neither stack_t nor sigaltstack are available on LynxOS-178
Alternate_Stack : aliased System.Address;
-- This is a dummy definition, never used (Alternate_Stack_Size is 0)
Alternate_Stack_Size : constant := 0;
-- No alternate signal stack is used on this platform
Stack_Base_Available : constant Boolean := False;
-- Indicates whether the stack base is available on this target
function Get_Stack_Base (thread : pthread_t) return Address;
pragma Inline (Get_Stack_Base);
-- Returns the stack base of the specified thread. Only call this function
-- when Stack_Base_Available is True.
function Get_Page_Size return int;
-- Returns the size of a page in bytes
PROT_NONE : constant := 1;
PROT_READ : constant := 2;
PROT_WRITE : constant := 4;
PROT_EXEC : constant := 8;
PROT_ALL : constant := PROT_READ + PROT_WRITE + PROT_EXEC;
PROT_ON : constant := PROT_READ;
PROT_OFF : constant := PROT_ALL;
function mprotect (addr : Address; len : size_t; prot : int) return int;
pragma Import (C, mprotect);
---------------------------------------
-- Nonstandard Thread Initialization --
---------------------------------------
procedure pthread_init;
-- This is a dummy procedure to share some GNULLI files
-------------------------
-- POSIX.1c Section 3 --
-------------------------
function sigwait
(set : access sigset_t;
sig : access Signal) return int;
pragma Inline (sigwait);
-- LynxOS has non standard sigwait
function pthread_kill
(thread : pthread_t;
sig : Signal) return int;
pragma Import (C, pthread_kill, "pthread_kill");
function pthread_sigmask
(how : int;
set : access sigset_t;
oset : access sigset_t) return int;
pragma Import (C, pthread_sigmask, "pthread_sigmask");
----------------------------
-- POSIX.1c Section 11 --
----------------------------
function pthread_mutexattr_init
(attr : access pthread_mutexattr_t) return int;
pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
function pthread_mutexattr_destroy
(attr : access pthread_mutexattr_t) return int;
pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
function pthread_mutex_init
(mutex : access pthread_mutex_t;
attr : access pthread_mutexattr_t) return int;
pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
function pthread_condattr_init
(attr : access pthread_condattr_t) return int;
pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
function pthread_condattr_destroy
(attr : access pthread_condattr_t) return int;
pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
function pthread_cond_init
(cond : access pthread_cond_t;
attr : access pthread_condattr_t) return int;
pragma Import (C, pthread_cond_init, "pthread_cond_init");
function pthread_cond_destroy (cond : access pthread_cond_t) return int;
pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
function pthread_cond_signal (cond : access pthread_cond_t) return int;
pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
function pthread_cond_wait
(cond : access pthread_cond_t;
mutex : access pthread_mutex_t) return int;
pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
function pthread_cond_timedwait
(cond : access pthread_cond_t;
mutex : access pthread_mutex_t;
abstime : access timespec) return int;
pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
--------------------------
-- POSIX.1c Section 13 --
--------------------------
PTHREAD_PRIO_NONE : constant := 0;
PTHREAD_PRIO_INHERIT : constant := 1;
PTHREAD_PRIO_PROTECT : constant := 2;
function pthread_mutexattr_setprotocol
(attr : access pthread_mutexattr_t;
protocol : int) return int;
pragma Import (C, pthread_mutexattr_setprotocol);
function pthread_mutexattr_setprioceiling
(attr : access pthread_mutexattr_t;
prioceiling : int) return int;
pragma Import (C, pthread_mutexattr_setprioceiling);
type struct_sched_param is record
sched_priority : int;
end record;
pragma Convention (C, struct_sched_param);
function pthread_setschedparam
(thread : pthread_t;
policy : int;
param : access struct_sched_param) return int;
pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
function pthread_attr_setscope
(Unused_attr : access pthread_attr_t;
Unused_contentionscope : int) return int is (0);
-- pthread_attr_setscope is not implemented in production mode
function pthread_attr_setinheritsched
(attr : access pthread_attr_t;
inheritsched : int) return int;
pragma Import (C, pthread_attr_setinheritsched);
function pthread_attr_setschedpolicy
(attr : access pthread_attr_t;
policy : int) return int;
pragma Import (C, pthread_attr_setschedpolicy);
function sched_yield return int;
pragma Import (C, sched_yield, "sched_yield");
--------------------------
-- P1003.1c Section 16 --
--------------------------
function pthread_attr_init (attributes : access pthread_attr_t) return int;
pragma Import (C, pthread_attr_init, "pthread_attr_init");
function pthread_attr_destroy
(attributes : access pthread_attr_t) return int;
pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
function pthread_attr_setdetachstate
(attr : access pthread_attr_t;
detachstate : int) return int;
pragma Import (C, pthread_attr_setdetachstate);
function pthread_attr_setstacksize
(attr : access pthread_attr_t;
stacksize : size_t) return int;
pragma Import (C, 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");
---------------------
-- Multiprocessors --
---------------------
function Current_CPU return Multiprocessors.CPU;
-- Return the id of the current CPU
function Get_Affinity (Id : Thread_Id) return Multiprocessors.CPU_Range;
-- Return CPU affinity of the given thread (maybe Not_A_Specific_CPU)
function Get_CPU (Id : Thread_Id) return Multiprocessors.CPU;
-- Return the CPU in charge of the given thread (always a valid CPU)
private
type sigset_t is array (1 .. 2) of long;
pragma Convention (C, sigset_t);
type pid_t is new long;
type time_t is range -2 ** (System.Parameters.time_t_bits - 1)
.. 2 ** (System.Parameters.time_t_bits - 1) - 1;
type suseconds_t is new int;
type timespec is record
tv_sec : time_t;
tv_nsec : long;
end record;
pragma Convention (C, timespec);
type struct_timeval is record
tv_sec : time_t;
tv_usec : suseconds_t;
end record;
pragma Convention (C, struct_timeval);
type st_attr is record
stksize : int;
prio : int;
inheritsched : int;
state : int;
sched : int;
detachstate : int;
guardsize : int;
end record;
pragma Convention (C, st_attr);
subtype st_attr_t is st_attr;
type pthread_attr_t is record
pthread_attr_magic : unsigned;
st : st_attr_t;
pthread_attr_scope : int;
end record;
pragma Convention (C, pthread_attr_t);
type pthread_condattr_t is record
cv_magic : unsigned;
cv_pshared : unsigned;
end record;
pragma Convention (C, pthread_condattr_t);
type pthread_mutexattr_t is record
m_flags : unsigned;
m_prio_c : int;
m_pshared : int;
end record;
pragma Convention (C, pthread_mutexattr_t);
type tid_t is new short;
type pthread_t is new tid_t;
type block_obj_t is record
b_head : int;
end record;
pragma Convention (C, block_obj_t);
type pthread_mutex_t is record
m_flags : unsigned;
m_owner : tid_t;
m_wait : block_obj_t;
m_prio_c : int;
m_oldprio : int;
m_count : int;
m_referenced : int;
end record;
pragma Convention (C, pthread_mutex_t);
type pthread_mutex_t_ptr is access all pthread_mutex_t;
type pthread_cond_t is record
cv_magic : unsigned;
cv_wait : block_obj_t;
cv_mutex : pthread_mutex_t_ptr;
cv_refcnt : int;
end record;
pragma Convention (C, pthread_cond_t);
type pthread_key_t is new int;
end System.OS_Interface;