projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| 231bba8d AC |
1 | ------------------------------------------------------------------------------ |
| 2 | -- -- | |
| 3 | -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- | |
| 4 | -- -- | |
| 5 | -- SYSTEM.TASK_PRIMITIVES.OPERATIONS.SPECIFIC -- | |
| 6 | -- -- | |
| 7 | -- B o d y -- | |
| 8 | -- -- | |
| 4b490c1e | 9 | -- Copyright (C) 1992-2020, Free Software Foundation, Inc. -- |
| 231bba8d AC |
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 a VxWorks version of this package for RTPs where foreign threads | |
| 33 | -- are recognized. The implementation is based on VxWorks tlsLib or oldTlsLib. | |
| 34 | ||
| 35 | separate (System.Task_Primitives.Operations) | |
| 36 | package body Specific is | |
| 37 | ||
| 38 | ATCB_Key : int := 0; | |
| 39 | -- Key used to find the Ada Task_Id associated with a thread | |
| 40 | ||
| 41 | ---------------- | |
| 42 | -- Initialize -- | |
| 43 | ---------------- | |
| 44 | ||
| 45 | procedure Initialize is | |
| 46 | begin | |
| 47 | ATCB_Key := tlsKeyCreate; | |
| 48 | pragma Assert (ATCB_Key /= ERROR); | |
| 49 | end Initialize; | |
| 50 | ||
| 51 | ------------------- | |
| 52 | -- Is_Valid_Task -- | |
| 53 | ------------------- | |
| 54 | ||
| 55 | function Is_Valid_Task return Boolean is | |
| 56 | begin | |
| 57 | return tlsValueGet (ATCB_Key) /= System.Null_Address; | |
| 58 | end Is_Valid_Task; | |
| 59 | ||
| 60 | --------- | |
| 61 | -- Set -- | |
| 62 | --------- | |
| 63 | ||
| 64 | procedure Set (Self_Id : Task_Id) is | |
| 65 | Result : STATUS; | |
| 66 | begin | |
| 67 | Result := tlsValueSet (ATCB_Key, To_Address (Self_Id)); | |
| 68 | pragma Assert (Result /= ERROR); | |
| 69 | end Set; | |
| 70 | ||
| 71 | ---------- | |
| 72 | -- Self -- | |
| 73 | ---------- | |
| 74 | ||
| 5067f3a0 PMR |
75 | -- To make Ada tasks and C threads interoperate better, we have added some |
| 76 | -- functionality to Self. Suppose a C main program (with threads) calls an | |
| 77 | -- Ada procedure and the Ada procedure calls the tasking runtime system. | |
| 78 | -- Eventually, a call will be made to self. Since the call is not coming | |
| 79 | -- from an Ada task, there will be no corresponding ATCB. | |
| 80 | ||
| 81 | -- What we do in Self is to catch references that do not come from | |
| 82 | -- recognized Ada tasks, and create an ATCB for the calling thread. | |
| 83 | ||
| 84 | -- The new ATCB will be "detached" from the normal Ada task master | |
| 85 | -- hierarchy, much like the existing implicitly created signal-server | |
| 86 | -- tasks. | |
| 87 | ||
| 231bba8d | 88 | function Self return Task_Id is |
| 5067f3a0 | 89 | Result : constant Task_Id := To_Task_Id (tlsValueGet (ATCB_Key)); |
| 231bba8d | 90 | begin |
| 5067f3a0 PMR |
91 | if Result /= null then |
| 92 | return Result; | |
| 93 | else | |
| 94 | -- If the value is Null then it is a non-Ada task | |
| 95 | ||
| 96 | return Register_Foreign_Thread; | |
| 97 | end if; | |
| 231bba8d AC |
98 | end Self; |
| 99 | ||
| 100 | end Specific; |