------------------------------------------------------------------------------ -- -- -- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS -- -- -- -- S Y S T E M . O S _ I N T E R F A C E -- -- -- -- B o d y -- -- -- -- -- -- Copyright (C) 1997-2001 Florida State University -- -- -- -- 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 2, or (at your option) any later ver- -- -- sion. GNARL 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. See the GNU General Public License -- -- for more details. You should have received a copy of the GNU General -- -- Public License distributed with GNARL; see file COPYING. If not, write -- -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- -- MA 02111-1307, USA. -- -- -- -- As a special exception, if other files instantiate generics from this -- -- unit, or you link this unit with other files to produce an executable, -- -- this unit does not by itself cause the resulting executable to be -- -- covered by the GNU General Public License. This exception does not -- -- however invalidate any other reasons why the executable file might be -- -- covered by the GNU Public License. -- -- -- -- GNARL was developed by the GNARL team at Florida State University. It is -- -- now maintained by Ada Core Technologies Inc. in cooperation with Florida -- -- State University (http://www.gnat.com). -- -- -- ------------------------------------------------------------------------------ -- This is a FSU Threads version of this package pragma Polling (Off); -- Turn off polling, we do not want ATC polling to take place during -- tasking operations. It causes infinite loops and other problems. with Interfaces.C; package body System.OS_Interface is use Interfaces.C; ----------------- -- To_Duration -- ----------------- function To_Duration (TS : timespec) return Duration is begin return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9; end To_Duration; function To_Duration (TV : struct_timeval) return Duration is begin return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6; end To_Duration; ----------------- -- To_Timespec -- ----------------- function To_Timespec (D : Duration) return timespec is S : time_t; F : Duration; begin S := time_t (Long_Long_Integer (D)); F := D - Duration (S); -- If F has negative value due to a round-up, adjust for positive F -- value. if F < 0.0 then S := S - 1; F := F + 1.0; end if; return timespec' (tv_sec => S, tv_nsec => long (Long_Long_Integer (F * 10#1#E9))); end To_Timespec; ---------------- -- To_Timeval -- ---------------- function To_Timeval (D : Duration) return struct_timeval is S : long; F : Duration; begin S := long (Long_Long_Integer (D)); F := D - Duration (S); -- If F has negative value due to a round-up, adjust for positive F -- value. if F < 0.0 then S := S - 1; F := F + 1.0; end if; return struct_timeval' (tv_sec => S, tv_usec => long (Long_Long_Integer (F * 10#1#E6))); end To_Timeval; ------------- -- sigwait -- ------------- -- FSU_THREADS has a nonstandard sigwait function sigwait (set : access sigset_t; sig : access Signal) return int is Result : int; function sigwait_base (set : access sigset_t) return int; pragma Import (C, sigwait_base, "sigwait"); begin Result := sigwait_base (set); if Result = -1 then sig.all := 0; return errno; end if; sig.all := Signal (Result); return 0; end sigwait; ------------------------ -- pthread_mutex_lock -- ------------------------ -- FSU_THREADS has nonstandard pthread_mutex_lock and unlock. -- It sets errno but the standard Posix requires it to be returned. function pthread_mutex_lock (mutex : access pthread_mutex_t) return int is function pthread_mutex_lock_base (mutex : access pthread_mutex_t) return int; pragma Import (C, pthread_mutex_lock_base, "pthread_mutex_lock"); Result : int; begin Result := pthread_mutex_lock_base (mutex); if Result /= 0 then return errno; end if; return 0; end pthread_mutex_lock; -------------------------- -- pthread_mutex_unlock -- -------------------------- function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int is function pthread_mutex_unlock_base (mutex : access pthread_mutex_t) return int; pragma Import (C, pthread_mutex_unlock_base, "pthread_mutex_unlock"); Result : int; begin Result := pthread_mutex_unlock_base (mutex); if Result /= 0 then return errno; end if; return 0; end pthread_mutex_unlock; ----------------------- -- pthread_cond_wait -- ----------------------- -- FSU_THREADS has a nonstandard pthread_cond_wait. -- The FSU_THREADS version returns EINTR when interrupted. function pthread_cond_wait (cond : access pthread_cond_t; mutex : access pthread_mutex_t) return int is function pthread_cond_wait_base (cond : access pthread_cond_t; mutex : access pthread_mutex_t) return int; pragma Import (C, pthread_cond_wait_base, "pthread_cond_wait"); Result : int; begin Result := pthread_cond_wait_base (cond, mutex); if Result = EINTR then return 0; else return Result; end if; end pthread_cond_wait; ---------------------------- -- pthread_cond_timedwait -- ---------------------------- -- FSU_THREADS has a nonstandard pthread_cond_timedwait. The -- FSU_THREADS version returns -1 and set errno to EAGAIN for timeout. function pthread_cond_timedwait (cond : access pthread_cond_t; mutex : access pthread_mutex_t; abstime : access timespec) return int is function pthread_cond_timedwait_base (cond : access pthread_cond_t; mutex : access pthread_mutex_t; abstime : access timespec) return int; pragma Import (C, pthread_cond_timedwait_base, "pthread_cond_timedwait"); Result : int; begin Result := pthread_cond_timedwait_base (cond, mutex, abstime); if Result = -1 then if errno = EAGAIN then return ETIMEDOUT; else return EINVAL; end if; end if; return 0; end pthread_cond_timedwait; --------------------------- -- pthread_setschedparam -- --------------------------- -- FSU_THREADS does not have pthread_setschedparam -- This routine returns a non-negative value upon failure -- but the error code can not be set conforming the POSIX standard. function pthread_setschedparam (thread : pthread_t; policy : int; param : access struct_sched_param) return int is function pthread_setschedattr (thread : pthread_t; attr : pthread_attr_t) return int; pragma Import (C, pthread_setschedattr, "pthread_setschedattr"); attr : aliased pthread_attr_t; Result : int; begin Result := pthread_attr_init (attr'Access); if Result /= 0 then return Result; end if; attr.sched := policy; -- Short-cut around pthread_attr_setprio attr.prio := param.sched_priority; Result := pthread_setschedattr (thread, attr); if Result /= 0 then return Result; end if; Result := pthread_attr_destroy (attr'Access); if Result /= 0 then return Result; else return 0; end if; end pthread_setschedparam; ------------------------- -- pthread_getspecific -- ------------------------- -- FSU_THREADS has a nonstandard pthread_getspecific function pthread_getspecific (key : pthread_key_t) return System.Address is function pthread_getspecific_base (key : pthread_key_t; value : access System.Address) return int; pragma Import (C, pthread_getspecific_base, "pthread_getspecific"); Tmp : aliased System.Address; Result : int; begin Result := pthread_getspecific_base (key, Tmp'Access); if Result /= 0 then return System.Null_Address; end if; return Tmp; end pthread_getspecific; --------------------------------- -- pthread_attr_setdetachstate -- --------------------------------- function pthread_attr_setdetachstate (attr : access pthread_attr_t; detachstate : int) return int is function pthread_attr_setdetachstate_base (attr : access pthread_attr_t; detachstate : access int) return int; pragma Import (C, pthread_attr_setdetachstate_base, "pthread_attr_setdetachstate"); Tmp : aliased int := detachstate; begin return pthread_attr_setdetachstate_base (attr, Tmp'Access); end pthread_attr_setdetachstate; ----------------- -- sched_yield -- ----------------- -- FSU_THREADS does not have sched_yield; function sched_yield return int is procedure sched_yield_base (arg : System.Address); pragma Import (C, sched_yield_base, "pthread_yield"); begin sched_yield_base (System.Null_Address); return 0; end sched_yield; ---------------- -- Stack_Base -- ---------------- function Get_Stack_Base (thread : pthread_t) return Address is begin return thread.stack_base; end Get_Stack_Base; end System.OS_Interface;