projects / thirdparty / gcc.git / blame
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1 | ------------------------------------------------------------------------------ |
| 2 | -- -- | |
| 3084fecd | 3 | -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- |
| cacbc350 RK |
4 | -- -- |
| 5 | -- S Y S T E M . T A S K I N G . E N T R Y _ C A L L S -- | |
| 6 | -- -- | |
| 7 | -- S p e c -- | |
| 8 | -- -- | |
| 4b490c1e | 9 | -- Copyright (C) 1992-2020, Free Software Foundation, Inc. -- |
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10 | -- -- |
| 11 | -- GNARL 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- -- | |
| 748086b7 JJ |
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- -- | |
| cacbc350 | 15 | -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- |
| 748086b7 JJ |
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/>. -- | |
| cacbc350 | 26 | -- -- |
| fbf5a39b AC |
27 | -- GNARL was developed by the GNARL team at Florida State University. -- |
| 28 | -- Extensive contributions were provided by Ada Core Technologies, Inc. -- | |
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29 | -- -- |
| 30 | ------------------------------------------------------------------------------ | |
| 31 | ||
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32 | -- This package provides internal RTS calls implementing operations |
| 33 | -- that apply to general entry calls, that is, calls to either | |
| 34 | -- protected or task entries. | |
| 35 | ||
| 36 | -- These declarations are not part of the GNARL Interface | |
| 37 | ||
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38 | package System.Tasking.Entry_Calls is |
| 39 | ||
| 07fc65c4 | 40 | procedure Wait_For_Completion (Entry_Call : Entry_Call_Link); |
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41 | -- This procedure suspends the calling task until the specified entry |
| 42 | -- call has either been completed or cancelled. It performs other | |
| 43 | -- operations required of suspended tasks, such as performing | |
| 44 | -- dynamic priority changes. On exit, the call will not be queued. | |
| 45 | -- This waits for calls on task or protected entries. | |
| 46 | -- Abortion must be deferred when calling this procedure. | |
| 07fc65c4 | 47 | -- Call this only when holding Self (= Entry_Call.Self) or global RTS lock. |
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48 | |
| 49 | procedure Wait_For_Completion_With_Timeout | |
| 07fc65c4 | 50 | (Entry_Call : Entry_Call_Link; |
| cacbc350 | 51 | Wakeup_Time : Duration; |
| 07fc65c4 GB |
52 | Mode : Delay_Modes; |
| 53 | Yielded : out Boolean); | |
| 54 | -- Same as Wait_For_Completion but wait for a timeout with the value | |
| cacbc350 | 55 | -- specified in Wakeup_Time as well. |
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56 | -- On return, Yielded indicates whether the wait has performed a yield. |
| 57 | -- Check_Exception must be called after calling this procedure. | |
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58 | |
| 59 | procedure Wait_Until_Abortable | |
| b5e792e2 | 60 | (Self_ID : Task_Id; |
| 07fc65c4 | 61 | Call : Entry_Call_Link); |
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62 | -- This procedure suspends the calling task until the specified entry |
| 63 | -- call is queued abortably or completes. | |
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64 | -- Abortion must be deferred when calling this procedure, and the global |
| 65 | -- RTS lock taken when Single_Lock. | |
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66 | |
| 67 | procedure Try_To_Cancel_Entry_Call (Succeeded : out Boolean); | |
| 68 | pragma Inline (Try_To_Cancel_Entry_Call); | |
| 69 | -- Try to cancel async. entry call. | |
| 70 | -- Effect includes Abort_To_Level and Wait_For_Completion. | |
| 12a13f01 | 71 | -- Cancelled = True iff the cancellation was successful, i.e., |
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72 | -- the call was not Done before this call. |
| 73 | -- On return, the call is off-queue and the ATC level is reduced by one. | |
| 74 | ||
| 75 | procedure Reset_Priority | |
| b5e792e2 | 76 | (Acceptor : Task_Id; |
| 07fc65c4 | 77 | Acceptor_Prev_Priority : Rendezvous_Priority); |
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78 | pragma Inline (Reset_Priority); |
| 79 | -- Reset the priority of a task completing an accept statement to | |
| 80 | -- the value it had before the call. | |
| 07fc65c4 | 81 | -- Acceptor should always be equal to Self. |
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82 | |
| 83 | procedure Check_Exception | |
| b5e792e2 | 84 | (Self_ID : Task_Id; |
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85 | Entry_Call : Entry_Call_Link); |
| 86 | pragma Inline (Check_Exception); | |
| 87 | -- Raise any pending exception from the Entry_Call. | |
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88 | -- This should be called at the end of every compiler interface procedure |
| 89 | -- that implements an entry call. | |
| 90 | -- In principle, the caller should not be abort-deferred (unless the | |
| 91 | -- application program violates the Ada language rules by doing entry calls | |
| 92 | -- from within protected operations -- an erroneous practice apparently | |
| 93 | -- followed with success by some adventurous GNAT users). | |
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94 | -- Absolutely, the caller should not be holding any locks, or there |
| 95 | -- will be deadlock. | |
| 96 | ||
| 97 | end System.Tasking.Entry_Calls; |