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-------------------------------------------------------------------------------
--- --
--- GNU ADA 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) 1997-2011 Free Software Foundation, Inc. --
--- --
--- GNARL 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. --
--- --
--- The GNARL files that were developed for RTEMS are maintained by On-Line --
--- Applications Research Corporation (http://www.oarcorp.com) in coopera- --
--- tion with Ada Core Technologies Inc. and Florida State University. --
--- --
-------------------------------------------------------------------------------
-
--- This is the RTEMS version of this package.
---
--- RTEMS target names are of the form CPU-rtems.
--- This implementation is designed to work on ALL RTEMS targets.
--- The RTEMS implementation is primarily based upon the POSIX threads
--- API but there are also bindings to GNAT/RTEMS support routines
--- to insulate this code from C API specific details and, in some
--- cases, obtain target architecture and BSP specific information
--- that is unavailable at the time this package is built.
-
--- This package encapsulates all direct interfaces to OS services
--- that are needed by children of System.
-
--- PLEASE DO NOT add any with-clauses to this package
--- or remove the pragma Preelaborate.
--- It is designed to be a bottom-level (leaf) package.
-
-with Interfaces.C;
-package System.OS_Interface is
- pragma Preelaborate;
-
- -- This interface assumes that "unsigned" is a 32-bit entity. This
- -- will correspond to RTEMS object ids.
-
- subtype rtems_id is Interfaces.C.unsigned;
-
- 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;
-
- -----------
- -- 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 := 116;
-
- -------------
- -- Signals --
- -------------
-
- Num_HW_Interrupts : constant := 256;
-
- Max_HW_Interrupt : constant := Num_HW_Interrupts - 1;
- type HW_Interrupt is new int range 0 .. Max_HW_Interrupt;
-
- Max_Interrupt : constant := Max_HW_Interrupt;
-
- type Signal is new int range 0 .. Max_Interrupt;
-
- SIGXCPU : constant := 0; -- XCPU
- 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)
- SIGIOT : constant := 6; -- IOT instruction
- SIGABRT : constant := 6; -- used by abort, replace SIGIOT in the future
- 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
- SIGUSR1 : constant := 16; -- user defined signal 1
- SIGUSR2 : constant := 17; -- user defined signal 2
-
- SIGADAABORT : constant := SIGABRT;
-
- type Signal_Set is array (Natural range <>) of Signal;
-
- Unmasked : constant Signal_Set := (SIGTRAP, SIGALRM, SIGEMT);
- Reserved : constant Signal_Set := (1 .. 1 => SIGKILL);
-
- 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_flags : int;
- sa_mask : sigset_t;
- sa_handler : System.Address;
- end record;
- pragma Convention (C, struct_sigaction);
- type struct_sigaction_ptr is access all struct_sigaction;
-
- SA_SIGINFO : constant := 16#02#;
-
- SA_ONSTACK : constant := 16#00#;
- -- SA_ONSTACK is not defined on RTEMS, 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 := 1;
- SIG_UNBLOCK : constant := 2;
- SIG_SETMASK : constant := 3;
-
- 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 (i.e SCHED_RR is supported)
-
- type timespec is private;
-
- type clockid_t is new int;
-
- CLOCK_REALTIME : constant clockid_t;
- CLOCK_MONOTONIC : constant clockid_t;
-
- function clock_gettime
- (clock_id : clockid_t;
- tp : access timespec) return int;
- pragma Import (C, clock_gettime, "clock_gettime");
-
- function To_Duration (TS : timespec) return Duration;
- pragma Inline (To_Duration);
-
- function To_Timespec (D : Duration) return timespec;
- pragma Inline (To_Timespec);
-
- -------------------------
- -- Priority Scheduling --
- -------------------------
-
- SCHED_FIFO : constant := 1;
- SCHED_RR : constant := 2;
- SCHED_OTHER : constant := 0;
-
- 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 --
- ---------
-
- function lwp_self return System.Address;
- -- lwp_self does not exist on this thread library, revert to pthread_self
- -- which is the closest approximation (with getpid). This function is
- -- needed to share 7staprop.adb across POSIX-like targets.
- 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);
-
- type pthread_t is private;
- subtype Thread_Id is pthread_t;
-
- type pthread_mutex_t is limited private;
- type pthread_rwlock_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_rwlockattr_t is limited private;
- type pthread_condattr_t is limited private;
- type pthread_key_t is private;
-
- No_Key : constant pthread_key_t;
-
- PTHREAD_CREATE_DETACHED : constant := 0;
-
- PTHREAD_SCOPE_PROCESS : constant := 0;
- PTHREAD_SCOPE_SYSTEM : constant := 1;
-
- -----------
- -- 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;
-
- Alternate_Stack : aliased System.Address;
- -- This is a dummy definition, never used (Alternate_Stack_Size is null)
-
- 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.
- -- This allows us to share s-osinte.adb between all the FSU/RTEMS
- -- run time.
- -- Note that this value can only be true if pthread_t has a complete
- -- definition that corresponds exactly to the C header files.
-
- 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.
-
- -- These two functions are only needed to share s-taprop.adb with
- -- FSU threads.
-
- function Get_Page_Size return size_t;
- function Get_Page_Size return Address;
- pragma Import (C, Get_Page_Size, "getpagesize");
- -- Returns the size of a page
-
- PROT_ON : constant := 0;
- PROT_OFF : constant := 0;
-
- function mprotect (addr : Address; len : size_t; prot : int) return int;
- pragma Import (C, mprotect);
-
- -----------------------------------------
- -- Nonstandard Thread Initialization --
- -----------------------------------------
-
- procedure pthread_init;
- -- FSU_THREADS requires pthread_init, which is nonstandard
- -- and this should be invoked during the elaboration of s-taprop.adb
- --
- -- RTEMS does not require this so we provide an empty Ada body.
-
- -------------------------
- -- POSIX.1c Section 3 --
- -------------------------
-
- function sigwait
- (set : access sigset_t;
- sig : access Signal) return int;
- pragma Import (C, sigwait, "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_rwlockattr_init
- (attr : access pthread_rwlockattr_t) return int;
- pragma Import (C, pthread_rwlockattr_init, "pthread_rwlockattr_init");
-
- function pthread_rwlockattr_destroy
- (attr : access pthread_rwlockattr_t) return int;
- pragma Import (C, pthread_rwlockattr_destroy, "pthread_rwlockattr_destroy");
-
- PTHREAD_RWLOCK_PREFER_READER_NP : constant := 0;
- PTHREAD_RWLOCK_PREFER_WRITER_NP : constant := 1;
- PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP : constant := 2;
-
- function pthread_rwlockattr_setkind_np
- (attr : access pthread_rwlockattr_t;
- pref : int) return int;
-
- function pthread_rwlock_init
- (mutex : access pthread_rwlock_t;
- attr : access pthread_rwlockattr_t) return int;
- pragma Import (C, pthread_rwlock_init, "pthread_rwlock_init");
-
- function pthread_rwlock_destroy
- (mutex : access pthread_rwlock_t) return int;
- pragma Import (C, pthread_rwlock_destroy, "pthread_rwlock_destroy");
-
- function pthread_rwlock_rdlock (mutex : access pthread_rwlock_t) return int;
- pragma Import (C, pthread_rwlock_rdlock, "pthread_rwlock_rdlock");
-
- function pthread_rwlock_wrlock (mutex : access pthread_rwlock_t) return int;
- pragma Import (C, pthread_rwlock_wrlock, "pthread_rwlock_wrlock");
-
- function pthread_rwlock_unlock (mutex : access pthread_rwlock_t) return int;
- pragma Import (C, pthread_rwlock_unlock, "pthread_rwlock_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");
-
- Relative_Timed_Wait : constant Boolean := False;
- -- pthread_cond_timedwait requires an absolute delay time
-
- --------------------------
- -- POSIX.1c Section 13 --
- --------------------------
-
- PTHREAD_PRIO_NONE : constant := 0;
- PTHREAD_PRIO_PROTECT : constant := 2;
- PTHREAD_PRIO_INHERIT : constant := 1;
-
- 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,
- "pthread_mutexattr_setprioceiling");
-
- type struct_sched_param is record
- sched_priority : int;
- ss_low_priority : int;
- ss_replenish_period : timespec;
- ss_initial_budget : timespec;
- 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
- (attr : access pthread_attr_t;
- contentionscope : int) return int;
- pragma Import (C, pthread_attr_setscope, "pthread_attr_setscope");
-
- 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 pthread_attr_setschedparam
- (attr : access pthread_attr_t;
- sched_param : int) return int;
- pragma Import (C, pthread_attr_setschedparam);
-
- 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, "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;