LWG 3035. std::allocator's constructors should be constexpr
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34 ------------------------------------------------------------------------------
36 -- This is the spec of this package using POSIX barriers
38 with System;
39 private with Ada.Finalization;
40 private with Interfaces.C;
42 package Ada.Synchronous_Barriers is
43 pragma Preelaborate (Synchronous_Barriers);
45 subtype Barrier_Limit is Positive range 1 .. Positive'Last;
47 type Synchronous_Barrier (Release_Threshold : Barrier_Limit) is
48 limited private;
50 procedure Wait_For_Release
51 (The_Barrier : in out Synchronous_Barrier;
52 Notified : out Boolean);
54 private
55 -- POSIX barrier data type
57 SIZEOF_PTHREAD_BARRIER_T : constant :=
58 (if System.Word_Size = 64 then 32 else 20);
59 -- Value defined according to the linux definition in pthreadtypes.h. On
60 -- other system, e.g. MIPS IRIX, the object is smaller, so it works
61 -- correctly although we are wasting some space.
63 type pthread_barrier_t_view is (size_based, align_based);
65 type pthread_barrier_t (Kind : pthread_barrier_t_view := size_based) is
66 record
67 case Kind is
68 when size_based =>
69 size : Interfaces.C.char_array (1 .. SIZEOF_PTHREAD_BARRIER_T);
70 when align_based =>
71 align : Interfaces.C.long;
72 end case;
73 end record;
74 pragma Unchecked_Union (pthread_barrier_t);
76 type Synchronous_Barrier (Release_Threshold : Barrier_Limit) is
77 new Ada.Finalization.Limited_Controlled with
78 record
79 POSIX_Barrier : aliased pthread_barrier_t;
80 end record;
82 overriding procedure Initialize (Barrier : in out Synchronous_Barrier);
83 overriding procedure Finalize (Barrier : in out Synchronous_Barrier);
84 end Ada.Synchronous_Barriers;