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 --
9 -- Copyright (C) 1991-2001 Free Software Foundation, Inc. --
11 -- GNARL is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNARL; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNARL was developed by the GNARL team at Florida State University. --
30 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
32 ------------------------------------------------------------------------------
34 -- This is a GNU/Linux (FSU THREADS) version of this package.
36 -- This package encapsulates all direct interfaces to OS services
37 -- that are needed by children of System.
39 -- PLEASE DO NOT add any with-clauses to this package
40 -- or remove the pragma Elaborate_Body.
41 -- It is designed to be a bottom-level (leaf) package.
44 package System.OS_Interface is
47 pragma Linker_Options ("-lgthreads");
48 pragma Linker_Options ("-lmalloc");
50 subtype int is Interfaces.C.int;
51 subtype short is Interfaces.C.short;
52 subtype long is Interfaces.C.long;
53 subtype unsigned is Interfaces.C.unsigned;
54 subtype unsigned_short is Interfaces.C.unsigned_short;
55 subtype unsigned_long is Interfaces.C.unsigned_long;
56 subtype unsigned_char is Interfaces.C.unsigned_char;
57 subtype plain_char is Interfaces.C.plain_char;
58 subtype size_t is Interfaces.C.size_t;
64 function errno return int;
65 pragma Import (C, errno, "__get_errno");
67 EAGAIN : constant := 11;
68 EINTR : constant := 4;
69 EINVAL : constant := 22;
70 ENOMEM : constant := 12;
71 ETIMEDOUT : constant := 110;
77 Max_Interrupt : constant := 31;
78 type Signal is new int range 0 .. Max_Interrupt;
79 for Signal'Size use int'Size;
81 SIGHUP : constant := 1; -- hangup
82 SIGINT : constant := 2; -- interrupt (rubout)
83 SIGQUIT : constant := 3; -- quit (ASCD FS)
84 SIGILL : constant := 4; -- illegal instruction (not reset)
85 SIGTRAP : constant := 5; -- trace trap (not reset)
86 SIGIOT : constant := 6; -- IOT instruction
87 SIGABRT : constant := 6; -- used by abort, replace SIGIOT in the future
88 SIGFPE : constant := 8; -- floating point exception
89 SIGKILL : constant := 9; -- kill (cannot be caught or ignored)
90 SIGBUS : constant := 7; -- bus error
91 SIGSEGV : constant := 11; -- segmentation violation
92 SIGPIPE : constant := 13; -- write on a pipe with no one to read it
93 SIGALRM : constant := 14; -- alarm clock
94 SIGTERM : constant := 15; -- software termination signal from kill
95 SIGUSR1 : constant := 10; -- user defined signal 1
96 SIGUSR2 : constant := 12; -- user defined signal 2
97 SIGCLD : constant := 17; -- alias for SIGCHLD
98 SIGCHLD : constant := 17; -- child status change
99 SIGPWR : constant := 30; -- power-fail restart
100 SIGWINCH : constant := 28; -- window size change
101 SIGURG : constant := 23; -- urgent condition on IO channel
102 SIGPOLL : constant := 29; -- pollable event occurred
103 SIGIO : constant := 29; -- I/O now possible (4.2 BSD)
104 SIGLOST : constant := 29; -- File lock lost
105 SIGSTOP : constant := 19; -- stop (cannot be caught or ignored)
106 SIGTSTP : constant := 20; -- user stop requested from tty
107 SIGCONT : constant := 18; -- stopped process has been continued
108 SIGTTIN : constant := 21; -- background tty read attempted
109 SIGTTOU : constant := 22; -- background tty write attempted
110 SIGVTALRM : constant := 26; -- virtual timer expired
111 SIGPROF : constant := 27; -- profiling timer expired
112 SIGXCPU : constant := 24; -- CPU time limit exceeded
113 SIGXFSZ : constant := 25; -- filesize limit exceeded
114 SIGUNUSED : constant := 31; -- unused signal (GNU/Linux)
115 SIGSTKFLT : constant := 16; -- coprocessor stack fault (GNU/Linux)
117 SIGADAABORT : constant := SIGABRT;
118 -- Change this if you want to use another signal for task abort.
119 -- SIGTERM might be a good one.
121 type Signal_Set is array (Natural range <>) of Signal;
123 Unmasked : constant Signal_Set :=
124 (SIGTRAP, SIGBUS, SIGTTIN, SIGTTOU, SIGTSTP, SIGPROF);
126 Reserved : constant Signal_Set :=
127 (SIGKILL, SIGSTOP, SIGALRM, SIGVTALRM, SIGUNUSED);
129 type sigset_t is private;
131 function sigaddset (set : access sigset_t; sig : Signal) return int;
132 pragma Import (C, sigaddset, "sigaddset");
134 function sigdelset (set : access sigset_t; sig : Signal) return int;
135 pragma Import (C, sigdelset, "sigdelset");
137 function sigfillset (set : access sigset_t) return int;
138 pragma Import (C, sigfillset, "sigfillset");
140 function sigismember (set : access sigset_t; sig : Signal) return int;
141 pragma Import (C, sigismember, "sigismember");
143 function sigemptyset (set : access sigset_t) return int;
144 pragma Import (C, sigemptyset, "sigemptyset");
146 type struct_sigaction is record
147 sa_handler : System.Address;
149 sa_flags : unsigned_long;
150 sa_restorer : System.Address;
152 pragma Convention (C, struct_sigaction);
153 type struct_sigaction_ptr is access all struct_sigaction;
155 type Machine_State is record
163 type Machine_State_Ptr is access all Machine_State;
165 SIG_BLOCK : constant := 0;
166 SIG_UNBLOCK : constant := 1;
167 SIG_SETMASK : constant := 2;
169 SIG_DFL : constant := 0;
170 SIG_IGN : constant := 1;
174 act : struct_sigaction_ptr;
175 oact : struct_sigaction_ptr) return int;
176 pragma Import (C, sigaction, "sigaction");
182 Time_Slice_Supported : constant Boolean := False;
183 -- Indicates wether time slicing is supported (i.e FSU threads have been
184 -- compiled with DEF_RR)
186 type timespec is private;
188 type clockid_t is private;
190 CLOCK_REALTIME : constant clockid_t;
192 function clock_gettime
193 (clock_id : clockid_t;
194 tp : access timespec) return int;
195 pragma Import (C, clock_gettime, "clock_gettime");
197 function To_Duration (TS : timespec) return Duration;
198 pragma Inline (To_Duration);
200 function To_Timespec (D : Duration) return timespec;
201 pragma Inline (To_Timespec);
203 type struct_timeval is private;
205 function To_Duration (TV : struct_timeval) return Duration;
206 pragma Inline (To_Duration);
208 function To_Timeval (D : Duration) return struct_timeval;
209 pragma Inline (To_Timeval);
211 -------------------------
212 -- Priority Scheduling --
213 -------------------------
215 SCHED_FIFO : constant := 0;
216 SCHED_RR : constant := 1;
217 SCHED_OTHER : constant := 2;
223 type pid_t is private;
225 function kill (pid : pid_t; sig : Signal) return int;
226 pragma Import (C, kill, "kill");
228 function getpid return pid_t;
229 pragma Import (C, getpid, "getpid");
235 function lwp_self return System.Address;
236 -- lwp_self does not exist on this thread library, revert to pthread_self
237 -- which is the closest approximation (with getpid). This function is
238 -- needed to share 7staprop.adb across POSIX-like targets.
239 pragma Import (C, lwp_self, "pthread_self");
245 type Thread_Body is access
246 function (arg : System.Address) return System.Address;
247 type pthread_t is private;
248 subtype Thread_Id is pthread_t;
250 type pthread_mutex_t is limited private;
251 type pthread_cond_t is limited private;
252 type pthread_attr_t is limited private;
253 type pthread_mutexattr_t is limited private;
254 type pthread_condattr_t is limited private;
255 type pthread_key_t is private;
257 PTHREAD_CREATE_DETACHED : constant := 1;
263 Stack_Base_Available : constant Boolean := False;
264 -- Indicates wether the stack base is available on this target.
265 -- This allows us to share s-osinte.adb between all the FSU run time.
266 -- Note that this value can only be true if pthread_t has a complete
267 -- definition that corresponds exactly to the C header files.
269 function Get_Stack_Base (thread : pthread_t) return Address;
270 pragma Inline (Get_Stack_Base);
271 -- returns the stack base of the specified thread.
272 -- Only call this function when Stack_Base_Available is True.
274 function Get_Page_Size return size_t;
275 function Get_Page_Size return Address;
276 pragma Import (C, Get_Page_Size, "getpagesize");
277 -- returns the size of a page, or 0 if this is not relevant on this
280 PROT_NONE : constant := 0;
281 PROT_READ : constant := 1;
282 PROT_WRITE : constant := 2;
283 PROT_EXEC : constant := 4;
284 PROT_ALL : constant := PROT_READ + PROT_WRITE + PROT_EXEC;
286 PROT_ON : constant := PROT_NONE;
287 PROT_OFF : constant := PROT_ALL;
289 function mprotect (addr : Address; len : size_t; prot : int) return int;
290 pragma Import (C, mprotect);
292 ---------------------------------------
293 -- Nonstandard Thread Initialization --
294 ---------------------------------------
296 procedure pthread_init;
297 -- FSU_THREADS requires pthread_init, which is nonstandard
298 -- and this should be invoked during the elaboration of s-taprop.adb
299 pragma Import (C, pthread_init, "pthread_init");
301 -------------------------
302 -- POSIX.1c Section 3 --
303 -------------------------
306 (set : access sigset_t;
307 sig : access Signal) return int;
308 pragma Inline (sigwait);
309 -- FSU_THREADS has a nonstandard sigwait
311 function pthread_kill
313 sig : Signal) return int;
314 pragma Import (C, pthread_kill, "pthread_kill");
316 -- FSU threads does not have pthread_sigmask. Instead, it uses
317 -- sigprocmask to do the signal handling when the thread library is
320 type sigset_t_ptr is access all sigset_t;
322 function pthread_sigmask
325 oset : sigset_t_ptr) return int;
326 pragma Import (C, pthread_sigmask, "sigprocmask");
328 --------------------------
329 -- POSIX.1c Section 11 --
330 --------------------------
332 function pthread_mutexattr_init
333 (attr : access pthread_mutexattr_t) return int;
334 pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
336 function pthread_mutexattr_destroy
337 (attr : access pthread_mutexattr_t) return int;
338 pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
340 function pthread_mutex_init
341 (mutex : access pthread_mutex_t;
342 attr : access pthread_mutexattr_t) return int;
343 pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
345 function pthread_mutex_destroy
346 (mutex : access pthread_mutex_t) return int;
347 pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
349 function pthread_mutex_lock
350 (mutex : access pthread_mutex_t) return int;
351 pragma Inline (pthread_mutex_lock);
352 -- FSU_THREADS has nonstandard pthread_mutex_lock
354 function pthread_mutex_unlock
355 (mutex : access pthread_mutex_t) return int;
356 pragma Inline (pthread_mutex_unlock);
357 -- FSU_THREADS has nonstandard pthread_mutex_lock
359 function pthread_condattr_init
360 (attr : access pthread_condattr_t) return int;
361 pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
363 function pthread_condattr_destroy
364 (attr : access pthread_condattr_t) return int;
365 pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
367 function pthread_cond_init
368 (cond : access pthread_cond_t;
369 attr : access pthread_condattr_t) return int;
370 pragma Import (C, pthread_cond_init, "pthread_cond_init");
372 function pthread_cond_destroy (cond : access pthread_cond_t) return int;
373 pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
375 function pthread_cond_signal (cond : access pthread_cond_t) return int;
376 pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
378 function pthread_cond_wait
379 (cond : access pthread_cond_t;
380 mutex : access pthread_mutex_t) return int;
381 pragma Inline (pthread_cond_wait);
382 -- FSU_THREADS has a nonstandard pthread_cond_wait
384 function pthread_cond_timedwait
385 (cond : access pthread_cond_t;
386 mutex : access pthread_mutex_t;
387 abstime : access timespec) return int;
388 pragma Inline (pthread_cond_timedwait);
389 -- FSU_THREADS has a nonstandard pthread_cond_timedwait
391 Relative_Timed_Wait : constant Boolean := False;
392 -- pthread_cond_timedwait requires an absolute delay time
394 --------------------------
395 -- POSIX.1c Section 13 --
396 --------------------------
398 PTHREAD_PRIO_NONE : constant := 0;
399 PTHREAD_PRIO_PROTECT : constant := 2;
400 PTHREAD_PRIO_INHERIT : constant := 1;
402 function pthread_mutexattr_setprotocol
403 (attr : access pthread_mutexattr_t;
404 protocol : int) return int;
405 pragma Import (C, pthread_mutexattr_setprotocol);
407 function pthread_mutexattr_setprioceiling
408 (attr : access pthread_mutexattr_t;
409 prioceiling : int) return int;
411 (C, pthread_mutexattr_setprioceiling,
412 "pthread_mutexattr_setprio_ceiling");
414 type struct_sched_param is record
415 sched_priority : int; -- scheduling priority
418 function pthread_setschedparam
421 param : access struct_sched_param) return int;
422 pragma Inline (pthread_setschedparam);
423 -- FSU_THREADS does not have pthread_setschedparam
425 function pthread_attr_setscope
426 (attr : access pthread_attr_t;
427 contentionscope : int) return int;
428 pragma Import (C, pthread_attr_setscope, "pthread_attr_setscope");
430 function pthread_attr_setinheritsched
431 (attr : access pthread_attr_t;
432 inheritsched : int) return int;
433 pragma Import (C, pthread_attr_setinheritsched);
435 function pthread_attr_setschedpolicy
436 (attr : access pthread_attr_t;
437 policy : int) return int;
438 pragma Import (C, pthread_attr_setschedpolicy, "pthread_attr_setsched");
440 function sched_yield return int;
441 pragma Inline (sched_yield);
442 -- FSU_THREADS does not have sched_yield;
444 ---------------------------
445 -- P1003.1c - Section 16 --
446 ---------------------------
448 function pthread_attr_init (attributes : access pthread_attr_t) return int;
449 pragma Import (C, pthread_attr_init, "pthread_attr_init");
451 function pthread_attr_destroy
452 (attributes : access pthread_attr_t) return int;
453 pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
455 function pthread_attr_setdetachstate
456 (attr : access pthread_attr_t;
457 detachstate : int) return int;
458 pragma Inline (pthread_attr_setdetachstate);
459 -- FSU_THREADS has a nonstandard pthread_attr_setdetachstate
461 function pthread_attr_setstacksize
462 (attr : access pthread_attr_t;
463 stacksize : size_t) return int;
464 pragma Import (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
466 function pthread_create
467 (thread : access pthread_t;
468 attributes : access pthread_attr_t;
469 start_routine : Thread_Body;
470 arg : System.Address) return int;
471 pragma Import (C, pthread_create, "pthread_create");
473 procedure pthread_exit (status : System.Address);
474 pragma Import (C, pthread_exit, "pthread_exit");
476 function pthread_self return pthread_t;
477 pragma Import (C, pthread_self, "pthread_self");
479 --------------------------
480 -- POSIX.1c Section 17 --
481 --------------------------
483 function pthread_setspecific
484 (key : pthread_key_t;
485 value : System.Address) return int;
486 pragma Import (C, pthread_setspecific, "pthread_setspecific");
488 function pthread_getspecific (key : pthread_key_t) return System.Address;
489 pragma Inline (pthread_getspecific);
490 -- FSU_THREADS has a nonstandard pthread_getspecific
492 type destructor_pointer is access procedure (arg : System.Address);
494 function pthread_key_create
495 (key : access pthread_key_t;
496 destructor : destructor_pointer) return int;
497 pragma Import (C, pthread_key_create, "pthread_key_create");
501 type sigset_t is array (0 .. 31) of unsigned_long;
502 pragma Convention (C, sigset_t);
503 -- This is for GNU libc version 2 but should be backward compatible with
504 -- other libc where sigset_t is smaller.
506 type pid_t is new int;
508 type time_t is new long;
510 type timespec is record
514 pragma Convention (C, timespec);
516 type clockid_t is new int;
517 CLOCK_REALTIME : constant clockid_t := 0;
519 type struct_timeval is record
523 pragma Convention (C, struct_timeval);
525 type pthread_attr_t is record
528 contentionscope : int;
533 starttime : timespec;
537 pragma Convention (C_Pass_By_Copy, pthread_attr_t);
539 type pthread_condattr_t is record
542 pragma Convention (C, pthread_condattr_t);
544 type pthread_mutexattr_t is record
549 pragma Convention (C, pthread_mutexattr_t);
551 type sigjmp_buf is array (Integer range 0 .. 38) of int;
553 type pthread_t_struct is record
554 context : sigjmp_buf;
558 stack_base : System.Address;
560 pragma Convention (C, pthread_t_struct);
562 type pthread_t is access all pthread_t_struct;
564 type queue_t is record
565 head : System.Address;
566 tail : System.Address;
568 pragma Convention (C, queue_t);
570 type pthread_mutex_t is record
573 owner : System.Address;
577 prev_max_ceiling_prio : int;
579 pragma Convention (C, pthread_mutex_t);
581 type pthread_cond_t is record
585 mutex : System.Address;
587 pragma Convention (C, pthread_cond_t);
589 type pthread_key_t is new int;
591 end System.OS_Interface;