Mercurial > hg > CbC > CbC_gcc
comparison gcc/ada/libgnarl/a-synbar__posix.adb @ 111:04ced10e8804
gcc 7
| author | kono |
|---|---|
| date | Fri, 27 Oct 2017 22:46:09 +0900 |
| parents | |
| children | 84e7813d76e9 |
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| 68:561a7518be6b | 111:04ced10e8804 |
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| 1 ------------------------------------------------------------------------------ | |
| 2 -- -- | |
| 3 -- GNAT RUN-TIME COMPONENTS -- | |
| 4 -- -- | |
| 5 -- A D A . S Y N C H R O N O U S _ B A R R I E R S -- | |
| 6 -- -- | |
| 7 -- B o d y -- | |
| 8 -- -- | |
| 9 -- Copyright (C) 1992-2017, Free Software Foundation, Inc. -- | |
| 10 -- -- | |
| 11 -- This specification is derived from the Ada Reference Manual for use with -- | |
| 12 -- GNAT. The copyright notice above, and the license provisions that follow -- | |
| 13 -- apply solely to the contents of the part following the private keyword. -- | |
| 14 -- -- | |
| 15 -- GNAT is free software; you can redistribute it and/or modify it under -- | |
| 16 -- terms of the GNU General Public License as published by the Free Soft- -- | |
| 17 -- ware Foundation; either version 3, or (at your option) any later ver- -- | |
| 18 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- | |
| 19 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
| 20 -- or FITNESS FOR A PARTICULAR PURPOSE. -- | |
| 21 -- -- | |
| 22 -- As a special exception under Section 7 of GPL version 3, you are granted -- | |
| 23 -- additional permissions described in the GCC Runtime Library Exception, -- | |
| 24 -- version 3.1, as published by the Free Software Foundation. -- | |
| 25 -- -- | |
| 26 -- You should have received a copy of the GNU General Public License and -- | |
| 27 -- a copy of the GCC Runtime Library Exception along with this program; -- | |
| 28 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- | |
| 29 -- <http://www.gnu.org/licenses/>. -- | |
| 30 -- -- | |
| 31 -- GNAT was originally developed by the GNAT team at New York University. -- | |
| 32 -- Extensive contributions were provided by Ada Core Technologies Inc. -- | |
| 33 -- -- | |
| 34 ------------------------------------------------------------------------------ | |
| 35 | |
| 36 -- This is the body of this package using POSIX barriers | |
| 37 | |
| 38 with Interfaces.C; use Interfaces.C; | |
| 39 | |
| 40 package body Ada.Synchronous_Barriers is | |
| 41 | |
| 42 -------------------- | |
| 43 -- POSIX barriers -- | |
| 44 -------------------- | |
| 45 | |
| 46 function pthread_barrier_init | |
| 47 (barrier : not null access pthread_barrier_t; | |
| 48 attr : System.Address := System.Null_Address; | |
| 49 count : unsigned) return int; | |
| 50 pragma Import (C, pthread_barrier_init, "pthread_barrier_init"); | |
| 51 -- Initialize barrier with the attributes in attr. The barrier is opened | |
| 52 -- when count waiters arrived. If attr is null the default barrier | |
| 53 -- attributes are used. | |
| 54 | |
| 55 function pthread_barrier_destroy | |
| 56 (barrier : not null access pthread_barrier_t) return int; | |
| 57 pragma Import (C, pthread_barrier_destroy, "pthread_barrier_destroy"); | |
| 58 -- Destroy a previously dynamically initialized barrier | |
| 59 | |
| 60 function pthread_barrier_wait | |
| 61 (barrier : not null access pthread_barrier_t) return int; | |
| 62 pragma Import (C, pthread_barrier_wait, "pthread_barrier_wait"); | |
| 63 -- Wait on barrier | |
| 64 | |
| 65 -------------- | |
| 66 -- Finalize -- | |
| 67 -------------- | |
| 68 | |
| 69 overriding procedure Finalize (Barrier : in out Synchronous_Barrier) is | |
| 70 Result : int; | |
| 71 begin | |
| 72 Result := pthread_barrier_destroy (Barrier.POSIX_Barrier'Access); | |
| 73 pragma Assert (Result = 0); | |
| 74 end Finalize; | |
| 75 | |
| 76 overriding procedure Initialize (Barrier : in out Synchronous_Barrier) is | |
| 77 Result : int; | |
| 78 begin | |
| 79 Result := | |
| 80 pthread_barrier_init | |
| 81 (barrier => Barrier.POSIX_Barrier'Access, | |
| 82 attr => System.Null_Address, | |
| 83 count => unsigned (Barrier.Release_Threshold)); | |
| 84 pragma Assert (Result = 0); | |
| 85 end Initialize; | |
| 86 | |
| 87 ---------------------- | |
| 88 -- Wait_For_Release -- | |
| 89 ---------------------- | |
| 90 | |
| 91 procedure Wait_For_Release | |
| 92 (The_Barrier : in out Synchronous_Barrier; | |
| 93 Notified : out Boolean) | |
| 94 is | |
| 95 Result : int; | |
| 96 | |
| 97 PTHREAD_BARRIER_SERIAL_THREAD : constant := -1; | |
| 98 -- Value used to indicate the task which receives the notification for | |
| 99 -- the barrier open. | |
| 100 | |
| 101 begin | |
| 102 Result := | |
| 103 pthread_barrier_wait | |
| 104 (barrier => The_Barrier.POSIX_Barrier'Access); | |
| 105 pragma Assert | |
| 106 (Result = 0 or else Result = PTHREAD_BARRIER_SERIAL_THREAD); | |
| 107 | |
| 108 Notified := (Result = PTHREAD_BARRIER_SERIAL_THREAD); | |
| 109 end Wait_For_Release; | |
| 110 | |
| 111 end Ada.Synchronous_Barriers; |