Results for: "to_proc"

Returns true if the file is a block device, false if it isn’t or if the operating system doesn’t support this feature.

File.stat("testfile").blockdev?    #=> false
File.stat("/dev/hda1").blockdev?   #=> true

If the buffer is locked, meaning it is inside locked block execution. Locked buffer can’t be resized or freed, and another lock can’t be acquired on it.

Locking is not thread safe, but is a semantic used to ensure buffers don’t move while being used by a system call.

buffer.locked do
  buffer.write(io) # theoretical system call interface
end

Allows to process a buffer in exclusive way, for concurrency-safety. While the block is performed, the buffer is considered locked, and no other code can enter the lock. Also, locked buffer can’t be changed with resize or free.

buffer = IO::Buffer.new(4)
buffer.locked? #=> false

Fiber.schedule do
  buffer.locked do
    buffer.write(io) # theoretical system call interface
  end
end

Fiber.schedule do
  # in `locked': Buffer already locked! (IO::Buffer::LockedError)
  buffer.locked do
    buffer.set_string(...)
  end
end

The following operations acquire a lock: resize, free.

Locking is not thread safe. It is designed as a safety net around non-blocking system calls. You can only share a buffer between threads with appropriate synchronisation techniques.

A set of tasks to prepare the file in order to parse it

Sends a LOCK request to the path and gets a response, as an HTTPResponse object.

Sends a UNLOCK request to the path and gets a response, as an HTTPResponse object.

Inserts switch at the head of the list, and associates short, long and negated long options. Arguments are:

switch

OptionParser::Switch instance to be inserted.

short_opts

List of short style options.

long_opts

List of long style options.

nolong_opts

List of long style options with “no-” prefix.

prepend(switch, short_opts, long_opts, nolong_opts)

Opens a block for grouping objects to be pretty printed.

Arguments:

• indent - noop argument. Present for compatibility.

• open_obj - text appended before the &blok. Default is ”

• close_obj - text appended after the &blok. Default is ”

• open_width - noop argument. Present for compatibility.

• close_width - noop argument. Present for compatibility.

for debug