1------------------------------------------------------------------------------
2--                                                                          --
3--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
4--                                                                          --
5--                   S Y S T E M . O S _ I N T E R F A C E                  --
6--                                                                          --
7--                                  S p e c                                 --
8--                                                                          --
9--          Copyright (C) 1995-2019, Free Software Foundation, Inc.         --
10--                                                                          --
11-- GNAT 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 3,  or (at your option) any later ver- --
14-- sion.  GNAT 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.                                     --
17--                                                                          --
18-- As a special exception under Section 7 of GPL version 3, you are granted --
19-- additional permissions described in the GCC Runtime Library Exception,   --
20-- version 3.1, as published by the Free Software Foundation.               --
21--                                                                          --
22-- You should have received a copy of the GNU General Public License and    --
23-- a copy of the GCC Runtime Library Exception along with this program;     --
24-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
25-- <http://www.gnu.org/licenses/>.                                          --
26--                                                                          --
27-- GNARL was developed by the GNARL team at Florida State University.       --
28-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
29--                                                                          --
30------------------------------------------------------------------------------
31
32--  This is an Android version of this package which is based on the
33--  GNU/Linux version
34
35--  This package encapsulates all direct interfaces to OS services
36--  that are needed by the tasking run-time (libgnarl).
37
38--  PLEASE DO NOT add any with-clauses to this package or remove the pragma
39--  Preelaborate. This package is designed to be a bottom-level (leaf) package.
40
41with Ada.Unchecked_Conversion;
42with Interfaces.C;
43with System.Linux;
44with System.OS_Constants;
45
46package System.OS_Interface is
47   pragma Preelaborate;
48
49   subtype int            is Interfaces.C.int;
50   subtype char           is Interfaces.C.char;
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;
59
60   -----------
61   -- Errno --
62   -----------
63
64   function errno return int;
65   pragma Import (C, errno, "__get_errno");
66
67   EAGAIN    : constant := System.Linux.EAGAIN;
68   EINTR     : constant := System.Linux.EINTR;
69   EINVAL    : constant := System.Linux.EINVAL;
70   ENOMEM    : constant := System.Linux.ENOMEM;
71   EPERM     : constant := System.Linux.EPERM;
72   ETIMEDOUT : constant := System.Linux.ETIMEDOUT;
73
74   -------------
75   -- Signals --
76   -------------
77
78   Max_Interrupt : constant := 31;
79   type Signal is new int range 0 .. Max_Interrupt;
80   for Signal'Size use int'Size;
81
82   SIGHUP     : constant := System.Linux.SIGHUP;
83   SIGINT     : constant := System.Linux.SIGINT;
84   SIGQUIT    : constant := System.Linux.SIGQUIT;
85   SIGILL     : constant := System.Linux.SIGILL;
86   SIGTRAP    : constant := System.Linux.SIGTRAP;
87   SIGIOT     : constant := System.Linux.SIGIOT;
88   SIGABRT    : constant := System.Linux.SIGABRT;
89   SIGFPE     : constant := System.Linux.SIGFPE;
90   SIGKILL    : constant := System.Linux.SIGKILL;
91   SIGBUS     : constant := System.Linux.SIGBUS;
92   SIGSEGV    : constant := System.Linux.SIGSEGV;
93   SIGPIPE    : constant := System.Linux.SIGPIPE;
94   SIGALRM    : constant := System.Linux.SIGALRM;
95   SIGTERM    : constant := System.Linux.SIGTERM;
96   SIGUSR1    : constant := System.Linux.SIGUSR1;
97   SIGUSR2    : constant := System.Linux.SIGUSR2;
98   SIGCLD     : constant := System.Linux.SIGCLD;
99   SIGCHLD    : constant := System.Linux.SIGCHLD;
100   SIGPWR     : constant := System.Linux.SIGPWR;
101   SIGWINCH   : constant := System.Linux.SIGWINCH;
102   SIGURG     : constant := System.Linux.SIGURG;
103   SIGPOLL    : constant := System.Linux.SIGPOLL;
104   SIGIO      : constant := System.Linux.SIGIO;
105   SIGLOST    : constant := System.Linux.SIGLOST;
106   SIGSTOP    : constant := System.Linux.SIGSTOP;
107   SIGTSTP    : constant := System.Linux.SIGTSTP;
108   SIGCONT    : constant := System.Linux.SIGCONT;
109   SIGTTIN    : constant := System.Linux.SIGTTIN;
110   SIGTTOU    : constant := System.Linux.SIGTTOU;
111   SIGVTALRM  : constant := System.Linux.SIGVTALRM;
112   SIGPROF    : constant := System.Linux.SIGPROF;
113   SIGXCPU    : constant := System.Linux.SIGXCPU;
114   SIGXFSZ    : constant := System.Linux.SIGXFSZ;
115   SIGUNUSED  : constant := System.Linux.SIGUNUSED;
116   SIGSTKFLT  : constant := System.Linux.SIGSTKFLT;
117
118   SIGADAABORT : constant := SIGABRT;
119   --  Change this to use another signal for task abort. SIGTERM might be a
120   --  good one.
121
122   type Signal_Set is array (Natural range <>) of Signal;
123
124   Unmasked : constant Signal_Set := (
125      SIGTRAP,
126      --  To enable debugging on multithreaded applications, mark SIGTRAP to
127      --  be kept unmasked.
128
129      SIGBUS,
130
131      SIGTTIN, SIGTTOU, SIGTSTP,
132      --  Keep these three signals unmasked so that background processes and IO
133      --  behaves as normal "C" applications
134
135      SIGPROF,
136      --  To avoid confusing the profiler
137
138      SIGKILL, SIGSTOP);
139      --  These two signals actually can't be masked (POSIX won't allow it)
140
141   Reserved : constant Signal_Set := (SIGVTALRM, SIGUNUSED);
142   --  Not clear why these two signals are reserved. Perhaps they are not
143   --  supported by this version of GNU/Linux ???
144
145   type sigset_t is private;
146
147   function sigaddset (set : access sigset_t; sig : Signal) return int;
148   pragma Import (C, sigaddset, "_sigaddset");
149
150   function sigdelset (set : access sigset_t; sig : Signal) return int;
151   pragma Import (C, sigdelset, "_sigdelset");
152
153   function sigfillset (set : access sigset_t) return int;
154   pragma Import (C, sigfillset, "_sigfillset");
155
156   function sigismember (set : access sigset_t; sig : Signal) return int;
157   pragma Import (C, sigismember, "_sigismember");
158
159   function sigemptyset (set : access sigset_t) return int;
160   pragma Import (C, sigemptyset, "_sigemptyset");
161
162   type union_type_3 is new String (1 .. 116);
163   type siginfo_t is record
164      si_signo : int;
165      si_code  : int;
166      si_errno : int;
167      X_data   : union_type_3;
168   end record;
169   pragma Convention (C, siginfo_t);
170
171   type struct_sigaction is record
172      sa_handler  : System.Address;
173      sa_mask     : sigset_t;
174      sa_flags    : Interfaces.C.unsigned_long;
175      sa_restorer : System.Address;
176   end record;
177   pragma Convention (C, struct_sigaction);
178
179   type struct_sigaction_ptr is access all struct_sigaction;
180
181   SA_SIGINFO : constant := System.Linux.SA_SIGINFO;
182   SA_ONSTACK : constant := System.Linux.SA_ONSTACK;
183   SA_NODEFER : constant := System.Linux.SA_NODEFER;
184   SA_RESTART : constant := System.Linux.SA_RESTART;
185
186   SIG_BLOCK   : constant := 0;
187   SIG_UNBLOCK : constant := 1;
188   SIG_SETMASK : constant := 2;
189
190   SIG_DFL : constant := 0;
191   SIG_IGN : constant := 1;
192
193   function sigaction
194     (sig  : Signal;
195      act  : struct_sigaction_ptr;
196      oact : struct_sigaction_ptr) return int;
197   pragma Import (C, sigaction, "sigaction");
198
199   ----------
200   -- Time --
201   ----------
202
203   Time_Slice_Supported : constant Boolean := True;
204   --  Indicates whether time slicing is supported
205
206   type timespec is private;
207
208   type clockid_t is new int;
209
210   function clock_gettime
211     (clock_id : clockid_t; tp : access timespec) return int;
212   pragma Import (C, clock_gettime, "clock_gettime");
213
214   function clock_getres
215     (clock_id : clockid_t;
216      res      : access timespec) return int;
217   pragma Import (C, clock_getres, "clock_getres");
218
219   function To_Duration (TS : timespec) return Duration;
220   pragma Inline (To_Duration);
221
222   function To_Timespec (D : Duration) return timespec;
223   pragma Inline (To_Timespec);
224
225   function sysconf (name : int) return long;
226   pragma Import (C, sysconf);
227
228   SC_CLK_TCK          : constant := 2;
229   SC_NPROCESSORS_ONLN : constant := 84;
230
231   -------------------------
232   -- Priority Scheduling --
233   -------------------------
234
235   SCHED_OTHER : constant := 0;
236   SCHED_FIFO  : constant := 1;
237   SCHED_RR    : constant := 2;
238
239   function To_Target_Priority
240     (Prio : System.Any_Priority)
241      return Interfaces.C.int is (Interfaces.C.int (Prio));
242   --  Maps System.Any_Priority to a POSIX priority
243
244   -------------
245   -- Process --
246   -------------
247
248   type pid_t is private;
249
250   function kill (pid : pid_t; sig : Signal) return int;
251   pragma Import (C, kill, "kill");
252
253   function getpid return pid_t;
254   pragma Import (C, getpid, "getpid");
255
256   -------------
257   -- Threads --
258   -------------
259
260   type Thread_Body is access
261     function (arg : System.Address) return System.Address;
262   pragma Convention (C, Thread_Body);
263
264   function Thread_Body_Access is new
265     Ada.Unchecked_Conversion (System.Address, Thread_Body);
266
267   type pthread_t is new unsigned_long;
268   subtype Thread_Id is pthread_t;
269
270   function To_pthread_t is
271     new Ada.Unchecked_Conversion (unsigned_long, pthread_t);
272
273   type pthread_mutex_t      is limited private;
274   type pthread_cond_t       is limited private;
275   type pthread_attr_t       is limited private;
276   type pthread_mutexattr_t  is limited private;
277   type pthread_condattr_t   is limited private;
278   type pthread_key_t        is private;
279
280   PTHREAD_CREATE_DETACHED : constant := 1;
281
282   PTHREAD_SCOPE_PROCESS : constant := 1;
283   PTHREAD_SCOPE_SYSTEM  : constant := 0;
284
285   --  Read/Write lock not supported on Android.
286
287   subtype pthread_rwlock_t     is pthread_mutex_t;
288   subtype pthread_rwlockattr_t is pthread_mutexattr_t;
289
290   -----------
291   -- Stack --
292   -----------
293
294   type stack_t is record
295      ss_sp    : System.Address;
296      ss_flags : int;
297      ss_size  : size_t;
298   end record;
299   pragma Convention (C, stack_t);
300
301   function sigaltstack
302     (ss  : not null access stack_t;
303      oss : access stack_t) return int;
304   pragma Import (C, sigaltstack, "sigaltstack");
305
306   Alternate_Stack : aliased System.Address;
307   pragma Import (C, Alternate_Stack, "__gnat_alternate_stack");
308   --  The alternate signal stack for stack overflows
309
310   Alternate_Stack_Size : constant := 16 * 1024;
311   --  This must be in keeping with init.c:__gnat_alternate_stack
312
313   Stack_Base_Available : constant Boolean := False;
314   --  Indicates whether the stack base is available on this target
315
316   function Get_Stack_Base (ignored_thread : pthread_t)
317     return Address is (Null_Address);
318   --  This is a dummy procedure to share some GNULLI files
319
320   function Get_Page_Size return int;
321   pragma Import (C, Get_Page_Size, "_getpagesize");
322   --  Returns the size of a page
323
324   PROT_NONE  : constant := 0;
325   PROT_READ  : constant := 1;
326   PROT_WRITE : constant := 2;
327   PROT_EXEC  : constant := 4;
328   PROT_ALL   : constant := PROT_READ + PROT_WRITE + PROT_EXEC;
329   PROT_ON    : constant := PROT_READ;
330   PROT_OFF   : constant := PROT_ALL;
331
332   function mprotect (addr : Address; len : size_t; prot : int) return int;
333   pragma Import (C, mprotect);
334
335   ---------------------------------------
336   -- Nonstandard Thread Initialization --
337   ---------------------------------------
338
339   procedure pthread_init is null;
340   --  This is a dummy procedure to share some GNULLI files
341
342   -------------------------
343   -- POSIX.1c  Section 3 --
344   -------------------------
345
346   function sigwait (set : access sigset_t; sig : access Signal) return int;
347   pragma Import (C, sigwait, "sigwait");
348
349   function pthread_kill (thread : pthread_t; sig : Signal) return int;
350   pragma Import (C, pthread_kill, "pthread_kill");
351
352   function pthread_sigmask
353     (how  : int;
354      set  : access sigset_t;
355      oset : access sigset_t) return int;
356   pragma Import (C, pthread_sigmask, "sigprocmask");
357   --  pthread_sigmask maybe be broken due to mismatch between sigset_t and
358   --  kernel_sigset_t, substitute sigprocmask temporarily.  ???
359   --  pragma Import (C, pthread_sigmask, "pthread_sigmask");
360
361   --------------------------
362   -- POSIX.1c  Section 11 --
363   --------------------------
364
365   function pthread_mutexattr_init
366     (attr : access pthread_mutexattr_t) return int;
367   pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
368
369   function pthread_mutexattr_destroy
370     (attr : access pthread_mutexattr_t) return int;
371   pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
372
373   function pthread_mutex_init
374     (mutex : access pthread_mutex_t;
375      attr  : access pthread_mutexattr_t) return int;
376   pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
377
378   function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
379   pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
380
381   function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
382   pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
383
384   function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
385   pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
386
387   function pthread_condattr_init
388     (attr : access pthread_condattr_t) return int;
389   pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
390
391   function pthread_condattr_destroy
392     (attr : access pthread_condattr_t) return int;
393   pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
394
395   function pthread_cond_init
396     (cond : access pthread_cond_t;
397      attr : access pthread_condattr_t) return int;
398   pragma Import (C, pthread_cond_init, "pthread_cond_init");
399
400   function pthread_cond_destroy (cond : access pthread_cond_t) return int;
401   pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
402
403   function pthread_cond_signal (cond : access pthread_cond_t) return int;
404   pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
405
406   function pthread_cond_wait
407     (cond  : access pthread_cond_t;
408      mutex : access pthread_mutex_t) return int;
409   pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
410
411   function pthread_cond_timedwait
412     (cond    : access pthread_cond_t;
413      mutex   : access pthread_mutex_t;
414      abstime : access timespec) return int;
415   pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
416
417   --------------------------
418   -- POSIX.1c  Section 13 --
419   --------------------------
420
421   PTHREAD_PRIO_PROTECT : constant := 0;
422   PTHREAD_PRIO_INHERIT : constant := 1;
423
424   function pthread_mutexattr_setprotocol
425     (ignored_attr     : access pthread_mutexattr_t;
426      ignored_protocol : int) return int is (0);
427
428   function pthread_mutexattr_setprioceiling
429     (ignored_attr        : access pthread_mutexattr_t;
430      ignored_prioceiling : int) return int is (0);
431
432   type struct_sched_param is record
433      sched_priority : int;  --  scheduling priority
434   end record;
435   pragma Convention (C, struct_sched_param);
436
437   function pthread_setschedparam
438     (thread : pthread_t;
439      policy : int;
440      param  : access struct_sched_param) return int;
441   pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
442
443   function pthread_attr_setscope
444     (attr  : access pthread_attr_t;
445      scope : int) return int;
446   pragma Import (C, pthread_attr_setscope, "pthread_attr_setscope");
447
448   function pthread_attr_setschedpolicy
449     (attr   : access pthread_attr_t;
450      policy : int) return int;
451   pragma Import
452     (C, pthread_attr_setschedpolicy, "pthread_attr_setschedpolicy");
453
454   function sched_yield return int;
455   pragma Import (C, sched_yield, "sched_yield");
456
457   ---------------------------
458   -- P1003.1c - Section 16 --
459   ---------------------------
460
461   function pthread_attr_init
462     (attributes : access pthread_attr_t) return int;
463   pragma Import (C, pthread_attr_init, "pthread_attr_init");
464
465   function pthread_attr_destroy
466     (attributes : access pthread_attr_t) return int;
467   pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
468
469   function pthread_attr_setdetachstate
470     (attr        : access pthread_attr_t;
471      detachstate : int) return int;
472   pragma Import
473     (C, pthread_attr_setdetachstate, "pthread_attr_setdetachstate");
474
475   function pthread_attr_setstacksize
476     (attr      : access pthread_attr_t;
477      stacksize : size_t) return int;
478   pragma Import (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
479
480   function pthread_create
481     (thread        : access pthread_t;
482      attributes    : access pthread_attr_t;
483      start_routine : Thread_Body;
484      arg           : System.Address) return int;
485   pragma Import (C, pthread_create, "pthread_create");
486
487   procedure pthread_exit (status : System.Address);
488   pragma Import (C, pthread_exit, "pthread_exit");
489
490   function pthread_self return pthread_t;
491   pragma Import (C, pthread_self, "pthread_self");
492
493   function lwp_self return System.Address;
494   pragma Import (C, lwp_self, "__gnat_lwp_self");
495
496   --------------------------
497   -- POSIX.1c  Section 17 --
498   --------------------------
499
500   function pthread_setspecific
501     (key   : pthread_key_t;
502      value : System.Address) return int;
503   pragma Import (C, pthread_setspecific, "pthread_setspecific");
504
505   function pthread_getspecific (key : pthread_key_t) return System.Address;
506   pragma Import (C, pthread_getspecific, "pthread_getspecific");
507
508   type destructor_pointer is access procedure (arg : System.Address);
509   pragma Convention (C, destructor_pointer);
510
511   function pthread_key_create
512     (key        : access pthread_key_t;
513      destructor : destructor_pointer) return int;
514   pragma Import (C, pthread_key_create, "pthread_key_create");
515
516   CPU_SETSIZE : constant := 1_024;
517   --  Size of the cpu_set_t mask on most linux systems (SUSE 11 uses 4_096).
518   --  This is kept for backward compatibility (System.Task_Info uses it), but
519   --  the run-time library does no longer rely on static masks, using
520   --  dynamically allocated masks instead.
521
522   type bit_field is array (1 .. CPU_SETSIZE) of Boolean;
523   for bit_field'Size use CPU_SETSIZE;
524   pragma Pack (bit_field);
525   pragma Convention (C, bit_field);
526
527   type cpu_set_t is record
528      bits : bit_field;
529   end record;
530   pragma Convention (C, cpu_set_t);
531
532   type cpu_set_t_ptr is access all cpu_set_t;
533   --  In the run-time library we use this pointer because the size of type
534   --  cpu_set_t varies depending on the glibc version. Hence, objects of type
535   --  cpu_set_t are allocated dynamically using the number of processors
536   --  available in the target machine (value obtained at execution time).
537
538   function CPU_ALLOC (count : size_t) return cpu_set_t_ptr;
539   pragma Import (C, CPU_ALLOC, "__gnat_cpu_alloc");
540   --  Wrapper around the CPU_ALLOC C macro
541
542   function CPU_ALLOC_SIZE (count : size_t) return size_t;
543   pragma Import (C, CPU_ALLOC_SIZE, "__gnat_cpu_alloc_size");
544   --  Wrapper around the CPU_ALLOC_SIZE C macro
545
546   procedure CPU_FREE (cpuset : cpu_set_t_ptr);
547   pragma Import (C, CPU_FREE, "__gnat_cpu_free");
548   --  Wrapper around the CPU_FREE C macro
549
550   procedure CPU_ZERO (count : size_t; cpuset : cpu_set_t_ptr);
551   pragma Import (C, CPU_ZERO, "__gnat_cpu_zero");
552   --  Wrapper around the CPU_ZERO_S C macro
553
554   procedure CPU_SET (cpu : int; count : size_t; cpuset : cpu_set_t_ptr);
555   pragma Import (C, CPU_SET, "__gnat_cpu_set");
556   --  Wrapper around the CPU_SET_S C macro
557
558   function pthread_setaffinity_np
559     (thread     : pthread_t;
560      cpusetsize : size_t;
561      cpuset     : cpu_set_t_ptr) return int;
562   pragma Import (C, pthread_setaffinity_np, "pthread_setaffinity_np");
563   pragma Weak_External (pthread_setaffinity_np);
564   --  Use a weak symbol because this function may be available or not,
565   --  depending on the version of the system.
566
567   function pthread_attr_setaffinity_np
568     (attr       : access pthread_attr_t;
569      cpusetsize : size_t;
570      cpuset     : cpu_set_t_ptr) return int;
571   pragma Import (C, pthread_attr_setaffinity_np,
572                    "pthread_attr_setaffinity_np");
573   pragma Weak_External (pthread_attr_setaffinity_np);
574   --  Use a weak symbol because this function may be available or not,
575   --  depending on the version of the system.
576
577private
578
579   type sigset_t is new Interfaces.C.unsigned_long;
580   pragma Convention (C, sigset_t);
581   for sigset_t'Alignment use Interfaces.C.unsigned_long'Alignment;
582
583   pragma Warnings (Off);
584   for struct_sigaction use record
585      sa_handler at Linux.sa_handler_pos range 0 .. Standard'Address_Size - 1;
586      sa_mask    at Linux.sa_mask_pos range 0 .. sigset_t'Size - 1;
587      sa_flags   at Linux.sa_flags_pos
588        range 0 .. Interfaces.C.unsigned_long'Size - 1;
589   end record;
590   --  We intentionally leave sa_restorer unspecified and let the compiler
591   --  append it after the last field, so disable corresponding warning.
592   pragma Warnings (On);
593
594   type pid_t is new int;
595
596   type time_t is new long;
597
598   type timespec is record
599      tv_sec  : time_t;
600      tv_nsec : long;
601   end record;
602   pragma Convention (C, timespec);
603
604   type unsigned_long_long_t is mod 2 ** 64;
605   --  Local type only used to get the alignment of this type below
606
607   subtype char_array is Interfaces.C.char_array;
608
609   type pthread_attr_t is record
610      Data : char_array (1 .. OS_Constants.PTHREAD_ATTR_SIZE);
611   end record;
612   pragma Convention (C, pthread_attr_t);
613   for pthread_attr_t'Alignment use Interfaces.C.unsigned_long'Alignment;
614
615   type pthread_condattr_t is record
616      Data : char_array (1 .. OS_Constants.PTHREAD_CONDATTR_SIZE);
617   end record;
618   pragma Convention (C, pthread_condattr_t);
619   for pthread_condattr_t'Alignment use Interfaces.C.int'Alignment;
620
621   type pthread_mutexattr_t is record
622      Data : char_array (1 .. OS_Constants.PTHREAD_MUTEXATTR_SIZE);
623   end  record;
624   pragma Convention (C, pthread_mutexattr_t);
625   for pthread_mutexattr_t'Alignment use Interfaces.C.int'Alignment;
626
627   type pthread_mutex_t is record
628      Data : char_array (1 .. OS_Constants.PTHREAD_MUTEX_SIZE);
629   end record;
630   pragma Convention (C, pthread_mutex_t);
631   for pthread_mutex_t'Alignment use Interfaces.C.unsigned_long'Alignment;
632
633   type pthread_cond_t is record
634      Data : char_array (1 .. OS_Constants.PTHREAD_COND_SIZE);
635   end record;
636   pragma Convention (C, pthread_cond_t);
637   for pthread_cond_t'Alignment use unsigned_long_long_t'Alignment;
638
639   type pthread_key_t is new unsigned;
640
641end System.OS_Interface;
642