Mercurial > hg > CbC > CbC_gcc
comparison gcc/ada/libgnarl/s-taspri__lynxos.ads @ 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 LIBRARY (GNARL) COMPONENTS -- | |
| 4 -- -- | |
| 5 -- S Y S T E M . T A S K _ P R I M I T I V E S -- | |
| 6 -- -- | |
| 7 -- S p e c -- | |
| 8 -- -- | |
| 9 -- Copyright (C) 1991-2017, Florida State University -- | |
| 10 -- Copyright (C) 1995-2017, AdaCore -- | |
| 11 -- -- | |
| 12 -- GNAT is free software; you can redistribute it and/or modify it under -- | |
| 13 -- terms of the GNU General Public License as published by the Free Soft- -- | |
| 14 -- ware Foundation; either version 3, or (at your option) any later ver- -- | |
| 15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- | |
| 16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
| 17 -- or FITNESS FOR A PARTICULAR PURPOSE. -- | |
| 18 -- -- | |
| 19 -- As a special exception under Section 7 of GPL version 3, you are granted -- | |
| 20 -- additional permissions described in the GCC Runtime Library Exception, -- | |
| 21 -- version 3.1, as published by the Free Software Foundation. -- | |
| 22 -- -- | |
| 23 -- You should have received a copy of the GNU General Public License and -- | |
| 24 -- a copy of the GCC Runtime Library Exception along with this program; -- | |
| 25 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- | |
| 26 -- <http://www.gnu.org/licenses/>. -- | |
| 27 -- -- | |
| 28 -- GNARL was developed by the GNARL team at Florida State University. -- | |
| 29 -- Extensive contributions were provided by Ada Core Technologies, Inc. -- | |
| 30 -- -- | |
| 31 ------------------------------------------------------------------------------ | |
| 32 | |
| 33 -- This is LynxOS Family version of this package. | |
| 34 | |
| 35 pragma Polling (Off); | |
| 36 -- Turn off polling, we do not want ATC polling to take place during tasking | |
| 37 -- operations. It causes infinite loops and other problems. | |
| 38 | |
| 39 with System.OS_Interface; | |
| 40 | |
| 41 package System.Task_Primitives is | |
| 42 pragma Preelaborate; | |
| 43 | |
| 44 type Lock is limited private; | |
| 45 -- Should be used for implementation of protected objects | |
| 46 | |
| 47 type RTS_Lock is limited private; | |
| 48 -- Should be used inside the runtime system. The difference between Lock | |
| 49 -- and the RTS_Lock is that the latter serves only as a semaphore so that | |
| 50 -- we do not check for ceiling violations. | |
| 51 | |
| 52 type Suspension_Object is limited private; | |
| 53 -- Should be used for the implementation of Ada.Synchronous_Task_Control | |
| 54 | |
| 55 type Task_Body_Access is access procedure; | |
| 56 -- Pointer to the task body's entry point (or possibly a wrapper declared | |
| 57 -- local to the GNARL). | |
| 58 | |
| 59 type Private_Data is limited private; | |
| 60 -- Any information that the GNULLI needs maintained on a per-task basis. | |
| 61 -- A component of this type is guaranteed to be included in the | |
| 62 -- Ada_Task_Control_Block. | |
| 63 | |
| 64 subtype Task_Address is System.Address; | |
| 65 Task_Address_Size : constant := Standard'Address_Size; | |
| 66 -- Type used for task addresses and its size | |
| 67 | |
| 68 Alternate_Stack_Size : constant := System.OS_Interface.Alternate_Stack_Size; | |
| 69 -- Import value from System.OS_Interface | |
| 70 | |
| 71 private | |
| 72 | |
| 73 type Lock is record | |
| 74 RW : aliased System.OS_Interface.pthread_rwlock_t; | |
| 75 WO : aliased System.OS_Interface.pthread_mutex_t; | |
| 76 end record; | |
| 77 | |
| 78 type RTS_Lock is new System.OS_Interface.pthread_mutex_t; | |
| 79 | |
| 80 type Suspension_Object is record | |
| 81 State : Boolean; | |
| 82 pragma Atomic (State); | |
| 83 -- Boolean that indicates whether the object is open. This field is | |
| 84 -- marked Atomic to ensure that we can read its value without locking | |
| 85 -- the access to the Suspension_Object. | |
| 86 | |
| 87 Waiting : Boolean; | |
| 88 -- Flag showing if there is a task already suspended on this object | |
| 89 | |
| 90 L : aliased System.OS_Interface.pthread_mutex_t; | |
| 91 -- Protection for ensuring mutual exclusion on the Suspension_Object | |
| 92 | |
| 93 CV : aliased System.OS_Interface.pthread_cond_t; | |
| 94 -- Condition variable used to queue threads until condition is signaled | |
| 95 end record; | |
| 96 | |
| 97 type Private_Data is limited record | |
| 98 Thread : aliased System.OS_Interface.pthread_t; | |
| 99 pragma Atomic (Thread); | |
| 100 -- Thread field may be updated by two different threads of control. | |
| 101 -- (See, Enter_Task and Create_Task in s-taprop.adb). They put the same | |
| 102 -- value (thr_self value). We do not want to use lock on those | |
| 103 -- operations and the only thing we have to make sure is that they are | |
| 104 -- updated in atomic fashion. | |
| 105 | |
| 106 LWP : aliased System.OS_Interface.pthread_t; | |
| 107 -- The purpose of this field is to provide a better tasking support on | |
| 108 -- gdb. The order of the two first fields (Thread and LWP) is important. | |
| 109 -- On targets where lwp is not relevant, this is equivalent to Thread. | |
| 110 | |
| 111 CV : aliased System.OS_Interface.pthread_cond_t; | |
| 112 -- Should be commented ??? (in all versions of taspri) | |
| 113 | |
| 114 L : aliased RTS_Lock; | |
| 115 -- Protection for all components is lock L | |
| 116 end record; | |
| 117 | |
| 118 end System.Task_Primitives; |