Class: AbstractLock

• Inheritance
• Description
• Class protocol
  • queries
• Instance protocol
  • Compatibility-ST80
  • accessing
  • private
  • queries

Inheritance:

   Object
   |
   +--AbstractLock
      |
      +--BoltLock
      |
      +--Semaphore

Package:

stx:libbasic

Category:

Kernel-Processes

Version:

rev: 1.4 date: 2023/06/20 08:24:45

user: cg

file: AbstractLock.st directory: libbasic

module: stx stc-classLibrary: libbasic

Author:

cg

Description:

code common to Semaphore and BoltLock

Class protocol:

 isAbstract

Return if this class is an abstract class.
True is returned here for myself only; false for subclasses.
Abstract subclasses must redefine this again.

Instance protocol:

 isEmpty

ST80 compatibility - return true if there are no waiters

 name

return the semaphore's userFriendly name (only used by semaphore- and process monitors)

 name: aString

set the semaphore's userFriendly name (only used by semaphore- and process monitors)

 addWaitingProcess: aProcess

add aProcess to the list of waiting processes.
all processes are ordered first-come-first-serve.

NOTE: must be called with blocked interrupts

 removeWaitingProcess: aProcess

remove aProcess from the list of waiting processes
NO action if it is not in the list.

NOTE: must be called with blocked interrupts

 wakeupWaiters

remove all waiting processes from the list of waiting processes
and resume them.
Answer true, if a higher priority process became ready, false if not.
NOTE: Must be called when known that waitingProcesses is nonNil and
also with blocked interrupts.
May not perform an operation that causes a reschedule.

 waitingProcesses

return the processes waiting on the receiver