Package Name: system.task_primitives
------------------------------------------------------------------------------
-- --
-- Gnu Ada Runtime 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 --
-- (Version for new GNARL) --
-- --
-- $Revision: 1.2 $ --
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-- Copyright (C) 1991,92,93,94,95,1996 Free Software Foundation, Inc. --
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-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
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------------------------------------------------------------------------------
-- This is a MachTen (MIT THREAD) version of this package.
-- DO NOT EDIT this file.
-- It was automatically generated from another file by the m4 macro processor.
-- The name of the file you should edit is the same as this one, but with
-- ".ads" replaced by ".sm4", or
-- ".adb" replaced by ".bm4", or
-- ".c" replaced by ".cm4", or
-- ".dat" replaced by ".tm4"
-- Local options selected:
-- __TARGET = sparc-sun-SunOS
-- __ARCH = SPARC
-- __OS = SUNOS41X
-- __HAS_SIGCONTEXT = 1
-- __HAS_UCONTEXT = 0
-- __THREADS = POSIX_THREADS
-- __THREAD_VARIANT = FSU_THREADS
-- __HAS_TIMESPEC = 1
-- __HAS_NANOSLEEP = 1
-- __HAS_CLOCK_GETTIME = 1
-- __HAS_GETTIMEOFDAY = 1
-- __POSIX_THREAD_PRIO_PROTECT = 1
-- __POSIX_THREAD_PRIO_INHERIT = 0
-- __POSIX_THREAD_ATTR_STACKADDR = 0
-- __POSIX_THREAD_ATTR_STACKSIZE = 0
-- __POSIX_THREAD_PRIORITY_SCHEDULING = 1
-- This package provides low-level support for most tasking features.
with Interfaces.C;
-- used for int
-- size_t
with System.OS_Interface;
-- used for pthread_mutex_t
-- pthread_cond_t
-- pthread_t
package System.Task_Primitives is
type Lock is limited private;
-- 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.
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.
private
type Lock is new System.OS_Interface.pthread_mutex_t;
type RTS_Lock is new System.OS_Interface.pthread_mutex_t;
type Private_Data is record
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
Current_Priority : Interfaces.C.int;
-- Active priority, except that the effects of protected object
-- priority ceilings are not reflected. This only reflects explicit
-- priority changes and priority inherited through task activation
-- and rendezvous.
-- Ada 95 notes: In Ada 95, this field will be transferred to the
-- Priority field of an Entry_Calls component when an entry call
-- is initiated. The Priority of the Entry_Calls component will not
-- change for the duration of the call. The accepting task can
-- use it to boost its own priority without fear of its changing in
-- the meantime.
-- This can safely be used in the priority ordering
-- of entry queues. Once a call is queued, its priority does not
-- change.
-- Since an entry call cannot be made while executing
-- a protected action, the priority of a task will never reflect a
-- priority ceiling change at the point of an entry call.
-- Protection: Only written by Self, and only accessed when Acceptor
-- accepts an entry or when Created activates, at which points Self is
-- suspended.
Stack_Size : Interfaces.c.size_t;
-- Requested stack size.
-- Protection: Only used by Self.
end record;
end System.Task_Primitives;