PSOS (real-time operating system): Difference between revisions

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{{Anchor|SCG|ISI}}

{{Infobox OS

| name = pSOS

| logo =

| screenshot =

| caption =

| developer = Alfred Chao, Software Components Group (SCG)<br/>[[Integrated Systems Inc.]] (ISI)<br/>[[Wind River Systems]]

| source_model source model = [[Closed source]] (original)<br/>[[Open source]] (later variants)

| kernel_type kernel type = [[Real-time operating system|Real-time]] [[Monolithic kernel|monolithic]]

| supported_platforms supported platforms = [[Motorola 68000 series]]

| ui =

| family =

| family = [[Real-time operating system]]s

| released = {{Start date and age|1982}}

| latest release version = Reliant (RoweBots)

| latest_release_version =

| latest_release_date latest release date = <!--{{Start date and age|20202007|08}}-->

| marketing_target marketing target = [[Embedded system]]s

| programmed_in programmed in = 68000 [[assembly language]]

| language = English

| update model =

| package manager =

| package_manager =

| working_state working state = Discontinued

| license = [[Proprietary software|Proprietary]]

| website =

}}

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In about 1991, Software Components Group was acquired by [[Integrated Systems Inc.]] (ISI) which further developed pSOS, then renamed as pSOS+, for other microprocessor families, by rewriting most of it in the [[programming language]] [[C (programming language)|C]]. Attention was also paid to supporting successively more [[integrated development environment]]s, culminating in pRISM+.

In July 1994, [[Integrated Systems Inc.]]ISI acquired [[Digital Research]]'s modular real-time multi-tasking operating system [[FlexOS]] from [[Novell]].<ref name="pNDE"/>

In 1995, [[Integrated Systems Inc.]]ISI offered a <code>pSOSystem/NEST</code> package for [[Novell Embedded Systems Technology|Novell's Embedded Systems Technology]] (NEST).<ref name="Novell_1995_NEST"/><ref name="pNDE"/>

In February 2000, [[Integrated Systems Inc.]]ISI was acquired by [[Wind River Systems]], the originators of the rival RTOS [[VxWorks]]. Despite initial reports that pSOS support would continue, development was halted. Wind River announced plans for a 'convergence' version of VxWorks which will support pSOS system calls, and that no further releases of pSOS will occur.

[[NXP Semiconductors]] acquired pSOS for [[TriMedia (mediaprocessor)|TriMedia]] from Wind River and continued to support this OS for the TriMedia [[very long instruction word]] (VLIW) core.<!-- but probablyLikely not after 2010, when the NXP's TriMedia group was terminated. -->

==Migration away from pSOS==

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During August 2000, MapuSoft Technologies Inc. came up with the pSOS OS Changer porting kit which can smoothly move the software to multiple OS such as [[Linux]], VxWorks, and more. It includes an ''[[integrated development environment]]'' (IDE) and ''application programming interface'' ([[API]]) optimization along with a profiling tool to measure API timing on target boards (www.mapusoft.com).

In August 2007, RoweBots, a former partner of SCG and ISI, [[open sourcedsource]]d their pSOS+ compatible version called Reliant. It is available to all that wish to upgrade without applicationsapplication changes.

The [[Xenomai]] project supports pSOS+ APIs (and others traditional RTOS APIs) over a Linux-based real-time framework to allow existing industrial applications to migrate easily to a Linux-based environment while keeping stringent real-time guarantees.

Another open sourced alternative is [[RTEMS]], which has support for various APIs, including the "Classic API" (compatible to pSOS) and the POSIX API. Compared to Linux, RTEMS is a closer match to pSOS applications due to its lower memory footprintsize and its strict realtime behaviour.

Popular ''Secure Sockets Layer'' (SSL), now ''[[SSL/TLSTransport Layer Security]]'' (TLS), libraries such as [[wolfSSL]] still support pSOS.

== See also ==

* [[FlexOS]]

* [[Novell Embedded Systems Technology]] (NEST)

* [[MapuSoft Technologies Inc.]]

* [[UNIX System V STREAMS]]