C-with-Ease Implemenations

Each actual instance of an Ease library may have a number of different options enabled, depending on the architecture and operating system you are using:

1. Distributed memory - Ease processes may operating in separate address spaces. This includes systems such as PVM.
2. Threads - Ease processes may share address spaces. This includes threads packages such as uSystem or Sun lwp, or kernel threads such as irix's sproc.
3. Pre-emption - Threads may switch between each other preemptively. If threads are non-preemptive, the Ease library explicitly switches between threads when necessary upon calls to Ease operations.

Distributed memory systems include:

• PVM
• Fujitsu AP1000

Threads systems supported include:

• Sun light weight processes (lwp) [non-preemptive]
• uSystem threads [preemptive]
• Posix threads [optionally preemptive]
  • Draft 4 (as available on DEC Alphas)
  • Draft 6 (for which there is a free port for linux, suns).
• Rex lwp (for mips, sparc, linux). [non-preemptive]