Module: ProcessShared::PSem

Extended by:
FFI::Library, DefineSingletonMethod
Included in:
AbstractSemaphore
Defined in:
lib/process_shared.rb,
lib/process_shared/psem.rb

Defined Under Namespace

Classes: Error

Class Method Summary collapse

Methods included from DefineSingletonMethod

define_singleton_method

Class Method Details

.psem_error_check(*syms) ⇒ Object

Replace methods in ‘syms` with error checking wrappers that invoke the original psem method and raise an appropriate error.

The last argument is assumed to be a pointer to a pointer where either a psem error or NULL will be stored.



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# File 'lib/process_shared/psem.rb', line 29

def psem_error_check(*syms)
  syms.each do |sym|
    method = self.method(sym)

    block = lambda do |*args|
      if method.call(*args) < 0
        errp = args[-1]
        unless errp.nil?
          begin
            err = Error.new(errp.read_pointer)
            errp.write_pointer(nil)
            if err[:source] == PSem.e_source_system
              raise SystemCallError.new("error in #{sym}", err[:errno])
            else
              raise "error in #{sym}: #{err.get_integer(1)}"
            end
          ensure
            psem_error_free(err)
          end
        end
      end
    end

    define_method(sym, &block)
    define_singleton_method(sym, &block)
  end
end