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....is a bounded error to raise the task s base priority above the ceiling priority of the corresponding protected object. ffl When an entry call is cancelled, it is a bounded error if the priority of the calling task is above the ceiling of the corresponding protected object. The Ada 95 Rationale [3] (AR D.4,3) provides some discussion on these issues. Unfortunately, both the ARM and the AR are silent on the issues of dynamically changing the ceiling priority itself. The implication is that the ceiling has to be set to the highest priority of all calling tasks, taking into account the ....

Intermetrics. Ada 95 rationale, 1995.

....restricting the use of certain language constructs. This paper will discuss Annex H and will also present the charter of the recently formed Annex H Rapporteur Group. INTRODUCTION The International Standards Organization (ISO) published the revised Ada standard [1] and an accompanying Rationale [2] in February 1995. The new standard replaces the 1987 ISO standard [3] which was identical to the 1983 American National Standards Institute (ANSI) standard [4] To distinguish the language defined by the new standard from that defined by the older standards, the names Ada 95 and Ada 83 are ....

Intermetrics, Inc., Cambridge, Massachusetts. Ada 95 Rationale, January 1995.

....the performance because one has to choose the maximum of the WCP of all possible calls or additional knowledge (on the algorithms used and the processed data) has to be incorporated into the program. Declaring a controlled real time type poses some problems: ffl A technique described in [Rat95] has to be applied to exploit multiple inheritance. ffl This technique uses access discriminants, which are only allowed for limited types. Thus we can only use limited controlled real time types, which means that we cannot use assignment for these types. These disadvantages give reasons why ....

Intermetrics, Inc. Ada95 Rationale, 1995.

....The traOEc light then becomes green and then red again. Without a semantics that guarantees transients are not missed the cars can miss a signal change Next, we examine some more recent forms of conditional synchronization. 1.1.1. Conditional synchronization in Ada95 and Orca. Both Ada95 [Int95] and Orca [BKT88] have a similar form of conditional synchronization. Figures 1.3 and 1.4 show examples from [Bal95] that was used to compare the synchronization facilities of the two languages. Both examples implement a shared counter abstraction whose operations may be invoked concurrently. ....

Intermetrics, Inc. Ada 95 Rationale, Jan. 1995.

....a server task that supports a read operation. Since mutual exclusion is not required for read, multiple read requests could be serviced concurrently. The rendezvous, however allows a task to communicate with only one other task at a time. This restriction has been addressed in the design of Ada95 [10], by adding another concept, that of protected types. Griffin ( 8] 11] is a statically typed language designed specifically for the rapid prototyping ( 1] 2] of Ada software. The Griffin constructs we describe in this paper address the above issues in a different way, which provides ....

....expression. Both conditional acceptance and out of FIFO order processing may be combined in the same accept statement. While useful for certain applications, conditional acceptance and out of FIFO ordering do not increase concurrency in contrast to the Griffin keywords multiple and and. Ada95 [10] takes another approach to increasing concurrency by adding protected types. These are types with hidden implementations whose operations consist of functions or procedures, with the constraint that only functions may be executed concurrently. 4 Applications 4.1 Readers writers In Figure 6, a ....

Intermetrics, Inc. Ada 95 Rationale, Jan. 1995.

....Ada Reference Manual only specifies the interface to the PCS. The distributed programming model of Ada 95 was designed with the objective to maintain the properties of a single Ada program, but allowing distributed execution with minimal additional semantic and implementation complexity ( 1] E(1) [2] E.1) 3 Network Application Support A minimal network application is comprised of at least one server, typically some kind of database, and any number of identical clients accessing it (see figure 1) In most applications, the central server is running permanently, whereas the clients just ....

....Declaring the partitions . Configuration: Assigning the different library units to the partitions . Allocation: Assigning the partitions to the actual execution nodes The Ada standard does not specify how these steps should be accomplished, or if the process itself is static or dynamic ([2], E.1) In a static approach, the partitioning, configuration and allocation steps are performed once, prior to execution, whereas in the dynamic approach they can be repeated several times during the execution of the distributed application. GLADE takes the static approach, allowing the user to ....

Intermetrics, Ada 95 Rationale, Intermetrics, Inc., Cambridge, Massachusetts, Jan. 1995.

....in general, and space used for control blocks of tasks that are created by an allocator, in particular. Requirements also address problems of access to a task outside of its direct master. A rationale for the design of Ada 95, which uses essentially the same termination model as Ada 83, appears in [22]. This report does not discuss the rationale behind the definitions of the dependence relations or of the termination rules. These definitions are discussed in [5] which describes a run time supervisor for Ada tasking. The contour model is an execution model for block structured programming ....

Intermetrics, Inc., 733 Concord Ave., Cambridge, MA 02138. Ada 95 Rationale, Jan. 1995.

....that are neither general, flexible, nor portable. Such problems also complicate, and therefore inhibit, inclusion of packages that define overlapping sets of names, which in turn can curtail software reuse and limit the value of standard libraries. While the provision of child libraries in Ada95 [15] ameliorates such problems to some extent, in general, these and other related difficulties are further evidence of how inadequacies in name management aspects of library management can lead to software engineering problems. Having a sufficiently powerful, general and flexible conceptual ....

Intermetrics, Inc. Ada 95 Rationale. Cambridge, MA, Jan. 1995.

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Intermetrics, Inc., Cambridge, Massachusetts. Ada 95 Rationale, January 1995.

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Intermetrics, Ada 95 Rationale, Intermetrics, Inc., Cambridge, Massachusetts, Jan. 1995.

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Intermetrics, Ada 95 Rationale, Intermetrics, Inc., Cambridge, Massachusetts, Jan. 1995.

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