Chapter 1 Overview of Enhancements to the ChorusOS 4.0 Operating System

This chapter provides an overview of the major changes between version 3.2 and version 4.0 of the ChorusOS operating system. It contains the following sections:

• "1.1 Enhancements to the ChorusOS 4.0 Operating System" lists the new features of ChorusOS 4.0.

• "1.2 API Changes in ChorusOS 4.0" summarizes the APIs which are new, or have changed, since version 3.2 of the ChorusOS operating system.

1.1 Enhancements to the ChorusOS 4.0 Operating System

Version 4.0 of the ChorusOS operating system provides the following enhancements over version 3.2:

• A full binary product:

  • Portable CPU family binary.

  • BSPs for porting on new platforms, adapting the boot method, changing and adding device drivers.

  • Reference implementations.

• Hot Restart:

  • Simplified high availability management.

  • Modular and fully configurable components.

• Enhanced TCP/IP:

  • Updated TCP/IP (BSD 2.2.8).

  • Multiple network interfaces.

  • Extended routing, IP forwarding and multicast DHCP.

  • Enhanced and simplified administration.

• Operating system configuration:

  • Independent operating system components: devices, file systems, networking, dynamic application loading.

  • Reduced memory footprint, higher modularity and improved scalability.

• Enhanced operating system features:

  • Dynamic libraries.

  • C++ exceptions.

  • Full support for flash memory.

  • Line disciplines.

  • Device file system.

• Sun Embedded WorkShop 4.0:

  • Open debugger integration framework.

  • GUI based configuration tool.

  • Uniform configuration data.

  • Uniform application, BSP and driver development environment.

1.2 API Changes in ChorusOS 4.0

Table 1-1 summarizes which APIs are new, or have changed, in ChorusOS 4.0.

Table 1-1 Status of APIs in ChorusOS 4.0

ChorusOS 3.2 API name	ChorusOS 4.0 API name	Status
BSD	BSD	Extended
CORE	CORE	Changed
--	DYNAMIC_LIB	New. See the DYNAMIC_LIB(5FEA) man page for more information.
RESTART	HOT_RESTART	New. See the HOT_RESTART(5FEA) man page for more information.
--	IOM_IPC	New. See the IOM_IPC(5FEA) man page for more information.
--	IOM_OSI	New. See the IOM_OSI(5FEA) man page for more information.
MEM	MEM	Changed
MEM_FLAT MEM_PROTECTED MEM_VIRTUAL	VIRTUAL_ADDRESS_SPACE FS_MAPPER	New. See the VIRTUAL_ADDRESS_SPACE(5FEA) and FS_MAPPER(5FEA) man pages for more information.
--	NFS_SERVER	New. See the NFS_SERVER(5FEA) man page for more information.
--	PERF	New. See the PERF(5FEA) man page for more information.
POSIX_MQ	POSIX_MQ	Extended
POSIX_SHM	POSIX_SHM	Extended
SCHED_CLASS	ROUND_ROBIN	Unchanged
VIRTUAL_TIME	VTIMER	Unchanged

Table 1-2 details the APIs which have changed or have been extended.

Table 1-2 Details of changed or extended APIs in ChorusOS 4.0

ChorusOS 4.0 API name	Details
BSD	The following functions have been added: cfgetispeed(), cfgetospeed(), cfmakeraw(), cfsetispeed(), cfsetospeed() and cfsetpeed().
CORE	The Interrupt Management Service (IMS) has been removed: f_imsIntrLevel(), f_imsProgLevel(), imsIntrMaskCount_f(), f_imsPreemptionCntlWord(), f_imsThreadEventRqst(), f_imsProcessSchedEvents() and f_imsProcessThreadEvents().
MEM	The following functions have been removed: svPageContigAllocate() and svPageContigFree().
POSIX_MQ	The following function has been added: fpathconf().
POSIX_SHM	The following functions have been added: fchmod(), fchown(), fpathconf() and fstat().