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Diffstat (limited to 'gcc-4.9/gcc/ada/a-synbar-posix.adb')
| -rw-r--r-- | gcc-4.9/gcc/ada/a-synbar-posix.adb | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/ada/a-synbar-posix.adb b/gcc-4.9/gcc/ada/a-synbar-posix.adb new file mode 100644 index 000000000..73dc9fa20 --- /dev/null +++ b/gcc-4.9/gcc/ada/a-synbar-posix.adb @@ -0,0 +1,109 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUN-TIME COMPONENTS -- +-- -- +-- A D A . S Y N C H R O N O U S _ B A R R I E R S -- +-- -- +-- B o d y -- +-- -- +-- Copyright (C) 1992-2011, Free Software Foundation, Inc. -- +-- -- +-- This specification is derived from the Ada Reference Manual for use with -- +-- GNAT. The copyright notice above, and the license provisions that follow -- +-- apply solely to the contents of the part following the private keyword. -- +-- -- +-- GNAT is free software; you can redistribute it and/or modify it under -- +-- terms of the GNU General Public License as published by the Free Soft- -- +-- ware Foundation; either version 3, or (at your option) any later ver- -- +-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- +-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- +-- or FITNESS FOR A PARTICULAR PURPOSE. -- +-- -- +-- As a special exception under Section 7 of GPL version 3, you are granted -- +-- additional permissions described in the GCC Runtime Library Exception, -- +-- version 3.1, as published by the Free Software Foundation. -- +-- -- +-- You should have received a copy of the GNU General Public License and -- +-- a copy of the GCC Runtime Library Exception along with this program; -- +-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- +-- <http://www.gnu.org/licenses/>. -- +-- -- +-- GNAT was originally developed by the GNAT team at New York University. -- +-- Extensive contributions were provided by Ada Core Technologies Inc. -- +-- -- +------------------------------------------------------------------------------ + +-- This is the body of this package using POSIX barriers + +with Interfaces.C; use Interfaces.C; + +package body Ada.Synchronous_Barriers is + + -------------------- + -- POSIX barriers -- + -------------------- + + function pthread_barrier_init + (barrier : not null access pthread_barrier_t; + attr : System.Address := System.Null_Address; + count : unsigned) return int; + pragma Import (C, pthread_barrier_init, "pthread_barrier_init"); + -- Initialize barrier with the attributes in attr. The barrier is opened + -- when count waiters arrived. If attr is null the default barrier + -- attributes shall be used. + + function pthread_barrier_destroy + (barrier : not null access pthread_barrier_t) return int; + pragma Import (C, pthread_barrier_destroy, "pthread_barrier_destroy"); + -- Destroy a previously dynamically initialized barrier + + function pthread_barrier_wait + (barrier : not null access pthread_barrier_t) return int; + pragma Import (C, pthread_barrier_wait, "pthread_barrier_wait"); + -- Wait on barrier + + -------------- + -- Finalize -- + -------------- + + overriding procedure Finalize (Barrier : in out Synchronous_Barrier) is + Result : int; + begin + Result := pthread_barrier_destroy (Barrier.POSIX_Barrier'Access); + pragma Assert (Result = 0); + end Finalize; + + overriding procedure Initialize (Barrier : in out Synchronous_Barrier) is + Result : int; + begin + Result := pthread_barrier_init + (barrier => Barrier.POSIX_Barrier'Access, + attr => System.Null_Address, + count => unsigned (Barrier.Release_Threshold)); + pragma Assert (Result = 0); + end Initialize; + + ---------------------- + -- Wait_For_Release -- + ---------------------- + + procedure Wait_For_Release + (The_Barrier : in out Synchronous_Barrier; + Notified : out Boolean) + is + Result : int; + + PTHREAD_BARRIER_SERIAL_THREAD : constant := -1; + -- Value used to indicate the task which receives the notification for + -- the barrier open. + + begin + Result := pthread_barrier_wait + (barrier => The_Barrier.POSIX_Barrier'Access); + pragma Assert + (Result = 0 or else Result = PTHREAD_BARRIER_SERIAL_THREAD); + + Notified := (Result = PTHREAD_BARRIER_SERIAL_THREAD); + end Wait_For_Release; + +end Ada.Synchronous_Barriers; |