1 ------------------------------------------------------------------------------
3 -- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- S Y S T E M . O S _ I N T E R F A C E --
10 -- Copyright (C) 1997-2001 Florida State University --
12 -- GNARL is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNARL; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
23 -- As a special exception, if other files instantiate generics from this --
24 -- unit, or you link this unit with other files to produce an executable, --
25 -- this unit does not by itself cause the resulting executable to be --
26 -- covered by the GNU General Public License. This exception does not --
27 -- however invalidate any other reasons why the executable file might be --
28 -- covered by the GNU Public License. --
30 -- GNARL was developed by the GNARL team at Florida State University. It is --
31 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
32 -- State University (http://www.gnat.com). --
34 ------------------------------------------------------------------------------
36 -- This is a FSU Threads version of this package
39 -- Turn off polling, we do not want ATC polling to take place during
40 -- tasking operations. It causes infinite loops and other problems.
44 package body System.OS_Interface is
52 function To_Duration (TS : timespec) return Duration is
54 return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
57 function To_Duration (TV : struct_timeval) return Duration is
59 return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
66 function To_Timespec (D : Duration) return timespec is
71 S := time_t (Long_Long_Integer (D));
72 F := D - Duration (S);
74 -- If F has negative value due to a round-up, adjust for positive F
82 return timespec' (tv_sec => S,
83 tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
90 function To_Timeval (D : Duration) return struct_timeval is
95 S := long (Long_Long_Integer (D));
96 F := D - Duration (S);
98 -- If F has negative value due to a round-up, adjust for positive F
106 return struct_timeval' (tv_sec => S,
107 tv_usec => long (Long_Long_Integer (F * 10#1#E6)));
114 -- FSU_THREADS has a nonstandard sigwait
117 (set : access sigset_t;
118 sig : access Signal) return int
122 function sigwait_base (set : access sigset_t) return int;
123 pragma Import (C, sigwait_base, "sigwait");
126 Result := sigwait_base (set);
133 sig.all := Signal (Result);
137 ------------------------
138 -- pthread_mutex_lock --
139 ------------------------
141 -- FSU_THREADS has nonstandard pthread_mutex_lock and unlock.
142 -- It sets errno but the standard Posix requires it to be returned.
144 function pthread_mutex_lock (mutex : access pthread_mutex_t) return int is
145 function pthread_mutex_lock_base
146 (mutex : access pthread_mutex_t) return int;
147 pragma Import (C, pthread_mutex_lock_base, "pthread_mutex_lock");
152 Result := pthread_mutex_lock_base (mutex);
159 end pthread_mutex_lock;
161 --------------------------
162 -- pthread_mutex_unlock --
163 --------------------------
165 function pthread_mutex_unlock
166 (mutex : access pthread_mutex_t) return int
168 function pthread_mutex_unlock_base
169 (mutex : access pthread_mutex_t) return int;
170 pragma Import (C, pthread_mutex_unlock_base, "pthread_mutex_unlock");
175 Result := pthread_mutex_unlock_base (mutex);
182 end pthread_mutex_unlock;
184 -----------------------
185 -- pthread_cond_wait --
186 -----------------------
188 -- FSU_THREADS has a nonstandard pthread_cond_wait.
189 -- The FSU_THREADS version returns EINTR when interrupted.
191 function pthread_cond_wait
192 (cond : access pthread_cond_t;
193 mutex : access pthread_mutex_t) return int
195 function pthread_cond_wait_base
196 (cond : access pthread_cond_t;
197 mutex : access pthread_mutex_t) return int;
198 pragma Import (C, pthread_cond_wait_base, "pthread_cond_wait");
203 Result := pthread_cond_wait_base (cond, mutex);
205 if Result = EINTR then
210 end pthread_cond_wait;
212 ----------------------------
213 -- pthread_cond_timedwait --
214 ----------------------------
216 -- FSU_THREADS has a nonstandard pthread_cond_timedwait. The
217 -- FSU_THREADS version returns -1 and set errno to EAGAIN for timeout.
219 function pthread_cond_timedwait
220 (cond : access pthread_cond_t;
221 mutex : access pthread_mutex_t;
222 abstime : access timespec) return int
224 function pthread_cond_timedwait_base
225 (cond : access pthread_cond_t;
226 mutex : access pthread_mutex_t;
227 abstime : access timespec) return int;
228 pragma Import (C, pthread_cond_timedwait_base, "pthread_cond_timedwait");
233 Result := pthread_cond_timedwait_base (cond, mutex, abstime);
236 if errno = EAGAIN then
244 end pthread_cond_timedwait;
246 ---------------------------
247 -- pthread_setschedparam --
248 ---------------------------
250 -- FSU_THREADS does not have pthread_setschedparam
252 -- This routine returns a non-negative value upon failure
253 -- but the error code can not be set conforming the POSIX standard.
255 function pthread_setschedparam
258 param : access struct_sched_param) return int
260 function pthread_setschedattr
262 attr : pthread_attr_t) return int;
263 pragma Import (C, pthread_setschedattr, "pthread_setschedattr");
265 attr : aliased pthread_attr_t;
269 Result := pthread_attr_init (attr'Access);
275 attr.sched := policy;
277 -- Short-cut around pthread_attr_setprio
279 attr.prio := param.sched_priority;
281 Result := pthread_setschedattr (thread, attr);
287 Result := pthread_attr_destroy (attr'Access);
294 end pthread_setschedparam;
296 -------------------------
297 -- pthread_getspecific --
298 -------------------------
300 -- FSU_THREADS has a nonstandard pthread_getspecific
302 function pthread_getspecific (key : pthread_key_t) return System.Address is
303 function pthread_getspecific_base
304 (key : pthread_key_t;
305 value : access System.Address) return int;
306 pragma Import (C, pthread_getspecific_base, "pthread_getspecific");
308 Tmp : aliased System.Address;
312 Result := pthread_getspecific_base (key, Tmp'Access);
315 return System.Null_Address;
319 end pthread_getspecific;
321 ---------------------------------
322 -- pthread_attr_setdetachstate --
323 ---------------------------------
325 function pthread_attr_setdetachstate
326 (attr : access pthread_attr_t;
327 detachstate : int) return int
329 function pthread_attr_setdetachstate_base
330 (attr : access pthread_attr_t;
331 detachstate : access int) return int;
333 (C, pthread_attr_setdetachstate_base, "pthread_attr_setdetachstate");
335 Tmp : aliased int := detachstate;
338 return pthread_attr_setdetachstate_base (attr, Tmp'Access);
339 end pthread_attr_setdetachstate;
345 -- FSU_THREADS does not have sched_yield;
347 function sched_yield return int is
348 procedure sched_yield_base (arg : System.Address);
349 pragma Import (C, sched_yield_base, "pthread_yield");
352 sched_yield_base (System.Null_Address);
360 function Get_Stack_Base (thread : pthread_t) return Address is
362 return thread.stack_base;
365 end System.OS_Interface;