Class: SysVIPC::Semaphore

Inherits:
Object
  • Object
show all
Defined in:
lib/sysvipc.rb

Instance Method Summary collapse

Instance Method Details

#getall ⇒ Object

Return an Array containing the value of each semaphore in the set. See semctl(2).



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# File 'lib/sysvipc.rb', line 216

def getall
  res, array = semctl(@semid, 0, GETALL)
  check_result(res)
  array
end

#getncnt ⇒ Object Also known as: ncnt

Get the number of processes waiting for a semaphore to become non-zero. See semctl(2).



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# File 'lib/sysvipc.rb', line 246

def getncnt
  semctl(@semid, 0, GETNCNT)
end

#getpid ⇒ Object Also known as: pid

Get the process ID of the last semaphore operation. See semctl(2).



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# File 'lib/sysvipc.rb', line 238

def getpid
  semctl(@semid, 0, GETPID)
end

#getval(semnum) ⇒ Object Also known as: val

Get the value of semaphore semnum. See semctl(2).



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# File 'lib/sysvipc.rb', line 230

def getval(semnum)
  semctl(@semid, semnum, GETVAL)
end

#getzcnt ⇒ Object Also known as: zcnt

Get the number of processes waiting for a semaphore to become zero. See semctl(2).



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# File 'lib/sysvipc.rb', line 254

def getzcnt
  semctl(@semid, 0, GETZCNT)
end

#ipc_rmid ⇒ Object Also known as: rm

Remove. See semctl(2).



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# File 'lib/sysvipc.rb', line 281

def ipc_rmid
  check_result(semctl(@semid, 0, IPC_RMID))
end

#ipc_set(semid_ds) ⇒ Object Also known as: semid_ds=

Set the Semid_ds object. See semctl(2).



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# File 'lib/sysvipc.rb', line 270

def ipc_set(semid_ds)
  unless Semid_ds === semid_ds
	raise ArgumentError,
	  "argument to ipc_set must be a Semid_ds"
  end
  check_result(semctl(@semid, 0, IPC_SET, semid_ds))
end

#ipc_stat ⇒ Object Also known as: semid_ds

Return the Semid_ds object. See semctl(2).



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# File 'lib/sysvipc.rb', line 261

def ipc_stat
  res, semid_ds = semctl(@semid, 0, IPC_STAT)
  check_result(res)
  semid_ds
end

#op(array) ⇒ Object

Perform a set of semaphore operations. The argument array is an Array of Sembuf objects. See semop(2).



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# File 'lib/sysvipc.rb', line 289

def op(array)
  check_result(semop(@semid, array, array.length))
end

#setall(values) ⇒ Object

Set each value in the semaphore set to the corresponding value in the Array values. See semctl(2).



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# File 'lib/sysvipc.rb', line 205

def setall(values)
  if values.length > @nsems
	raise ArgumentError,
	  "too many values(#{values.length} for semaphore set (#{@nsems})"
  end
  check_result(semctl(@semid, 0, SETALL, values))
end

#setval(semnum, val) ⇒ Object

Set the value of semaphore semnum to val. See semctl(2).



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# File 'lib/sysvipc.rb', line 224

def setval(semnum, val)
  check_result(semctl(@semid, semnum, SETVAL, val))
end