diff options
Diffstat (limited to 'gcc/ada/s-taspri-tru64.ads')
| -rw-r--r-- | gcc/ada/s-taspri-tru64.ads | 66 |
1 files changed, 43 insertions, 23 deletions
diff --git a/gcc/ada/s-taspri-tru64.ads b/gcc/ada/s-taspri-tru64.ads index 2caf54b5f25..e524d573fb8 100644 --- a/gcc/ada/s-taspri-tru64.ads +++ b/gcc/ada/s-taspri-tru64.ads @@ -1,12 +1,12 @@ ------------------------------------------------------------------------------ -- -- --- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS -- +-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- -- -- -- S Y S T E M . T A S K _ P R I M I T I V E S -- -- -- -- S p e c -- -- -- --- Copyright (C) 1991-2000 Free Software Foundation, Inc. -- +-- Copyright (C) 1991-2005 Free Software Foundation, Inc. -- -- -- -- GNARL 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- -- @@ -31,9 +31,9 @@ -- -- ------------------------------------------------------------------------------ --- This is the DEC Unix 4.0 version of this package. +-- This is the DEC Unix 4.0 version of this package --- This package provides low-level support for most tasking features. +-- This package provides low-level support for most tasking features pragma Polling (Off); -- Turn off polling, we do not want ATC polling to take place during @@ -51,43 +51,63 @@ with System.OS_Interface; package System.Task_Primitives is type Lock is limited private; - -- Should be used for implementation of protected objects. + -- Should be used for implementation of protected objects type RTS_Lock is limited private; - -- Should be used inside the runtime system. - -- The difference between Lock and the RTS_Lock is that the later - -- one serves only as a semaphore so that do not check for - -- ceiling violations. + -- Should be used inside the runtime system. The difference between Lock + -- and the RTS_Lock is that the later one serves only as a semaphore so + -- that do not check for ceiling violations. + + type Suspension_Object is limited private; + -- Should be used for the implementation of Ada.Synchronous_Task_Control type Task_Body_Access is access procedure; -- Pointer to the task body's entry point (or possibly a wrapper -- declared local to the GNARL). type Private_Data is limited private; - -- Any information that the GNULLI needs maintained on a per-task - -- basis. A component of this type is guaranteed to be included - -- in the Ada_Task_Control_Block. + -- Any information that the GNULLI needs maintained on a per-task basis. + -- A component of this type is guaranteed to be included private type Lock is record - L : aliased System.OS_Interface.pthread_mutex_t; - Ceiling : Interfaces.C.int; + L : aliased System.OS_Interface.pthread_mutex_t; + Ceiling : Interfaces.C.int; end record; type RTS_Lock is new System.OS_Interface.pthread_mutex_t; + + type Suspension_Object is record + State : Boolean; + pragma Atomic (State); + -- Boolean that indicates whether the object is open. This field is + -- marked Atomic to ensure that we can read its value without locking + -- the access to the Suspension_Object. + + Waiting : Boolean; + -- Flag showing if there is a task already suspended on this object + + L : aliased System.OS_Interface.pthread_mutex_t; + -- Protection for ensuring mutual exclusion on the Suspension_Object + + CV : aliased System.OS_Interface.pthread_cond_t; + -- Condition variable used to queue threads until the is signaled + end record; + type Private_Data is record - Thread : aliased System.OS_Interface.pthread_t; + Thread : aliased System.OS_Interface.pthread_t; pragma Atomic (Thread); -- Thread field may be updated by two different threads of control. - -- (See, Enter_Task and Create_Task in s-taprop.adb). - -- They put the same value (thr_self value). We do not want to - -- use lock on those operations and the only thing we have to - -- make sure is that they are updated in atomic fashion. - - CV : aliased System.OS_Interface.pthread_cond_t; - L : aliased RTS_Lock; - -- protection for all components is lock L + -- (See, Enter_Task and Create_Task in s-taprop.adb). They put the same + -- value (thr_self value). We do not want to use lock on those + -- operations and the only thing we have to make sure is that they are + -- updated in atomic fashion. + + CV : aliased System.OS_Interface.pthread_cond_t; + + L : aliased RTS_Lock; + -- Protection for all components is lock L end record; end System.Task_Primitives; |