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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) 1997-2009 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 private; CLOCK_REALTIME : 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_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; 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_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); type clockid_t is new rtems_id; CLOCK_REALTIME : constant clockid_t := 1; 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_t is new rtems_id; type pthread_mutex_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;
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