The directory prefix this RubyGems was installed at. If your prefix is in a standard location (ie, rubygems is installed where you’d expect it to be), then prefix returns nil.
Skips the current file or directory, restarting the loop with the next entry. If the current file is a directory, that directory will not be recursively entered. Meaningful only within the block associated with Find::find.
See the Find module documentation for an example.
Skips the current file or directory, restarting the loop with the next entry. If the current file is a directory, that directory will not be recursively entered. Meaningful only within the block associated with Find::find.
See the Find module documentation for an example.
Iterates over strongly connected component in the subgraph reachable from node.
Return value is unspecified.
each_strongly_connected_component_from doesn’t call tsort_each_node.
class G include TSort def initialize(g) @g = g end def tsort_each_child(n, &b) @g[n].each(&b) end def tsort_each_node(&b) @g.each_key(&b) end end graph = G.new({1=>[2, 3], 2=>[4], 3=>[2, 4], 4=>[]}) graph.each_strongly_connected_component_from(2) {|scc| p scc } #=> [4] # [2] graph = G.new({1=>[2], 2=>[3, 4], 3=>[2], 4=>[]}) graph.each_strongly_connected_component_from(2) {|scc| p scc } #=> [4] # [2, 3]
Iterates over strongly connected components in a graph. The graph is represented by node and each_child.
node is the first node. each_child should have call method which takes a node argument and yields for each child node.
Return value is unspecified.
TSort.each_strongly_connected_component_from is a class method and it doesn’t need a class to represent a graph which includes TSort.
graph = {1=>[2], 2=>[3, 4], 3=>[2], 4=>[]} each_child = lambda {|n, &b| graph[n].each(&b) } TSort.each_strongly_connected_component_from(1, each_child) {|scc| p scc } #=> [4] # [2, 3] # [1]
The top-level program node.
Like Enumerable#drop, but chains operation to be lazy-evaluated.
Wakes up all threads waiting for this lock.
Performs a Miller-Rabin probabilistic primality test for bn.
checks parameter is deprecated in version 3.0. It has no effect.
Returns the broadcast address of ifaddr. nil is returned if the flags doesn’t have IFF_BROADCAST.
Same as IO.
Same as IO.
Returns the number of native file system blocks allocated for this file, or nil if the operating system doesn’t support this feature.
File.stat("testfile").blocks #=> 2
Returns true if stat is a zero-length file; false otherwise.
File.stat("testfile").zero? #=> false
Returns true if stat is a socket, false if it isn’t or if the operating system doesn’t support this feature.
File.stat("testfile").socket? #=> false
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
If the buffer is private, meaning modifications to the buffer will not be replicated to the underlying file mapping.
# Create a test file: File.write('test.txt', 'test') # Create a private mapping from the given file. Note that the file here # is opened in read-only mode, but it doesn't matter due to the private # mapping: buffer = IO::Buffer.map(File.open('test.txt'), nil, 0, IO::Buffer::PRIVATE) # => #<IO::Buffer 0x00007fce63f11000+4 MAPPED PRIVATE> # Write to the buffer (invoking CoW of the underlying file buffer): buffer.set_string('b', 0) # => 1 # The file itself is not modified: File.read('test.txt') # => "test"
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.
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.
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("test", 0) end end
Read at least length bytes from the io starting at the specified from position, into the buffer starting at offset. If an error occurs, return -errno.
If length is not given or nil, it defaults to the size of the buffer minus the offset, i.e. the entire buffer.
If length is zero, exactly one pread operation will occur.
If offset is not given, it defaults to zero, i.e. the beginning of the buffer.
IO::Buffer.for('test') do |buffer| p buffer # => # <IO::Buffer 0x00007fca40087c38+4 SLICE> # 0x00000000 74 65 73 74 test # take 2 bytes from the beginning of urandom, # put them in buffer starting from position 2 buffer.pread(File.open('/dev/urandom', 'rb'), 0, 2, 2) p buffer # => # <IO::Buffer 0x00007f3bc65f2a58+4 EXTERNAL SLICE> # 0x00000000 05 35 73 74 te.5 end
Sends a LOCK request to the server; returns an instance of a subclass of Net::HTTPResponse.
The request is based on the Net::HTTP::Lock object created from string path, string body, and initial headers hash initheader.
data = '{"userId": 1, "id": 1, "title": "delectus aut autem", "completed": false}' http = Net::HTTP.new(hostname) http.lock('/todos/1', data)
Sends an UNLOCK request to the server; returns an instance of a subclass of Net::HTTPResponse.
The request is based on the Net::HTTP::Unlock object created from string path, string body, and initial headers hash initheader.
data = '{"userId": 1, "id": 1, "title": "delectus aut autem", "completed": false}' http = Net::HTTP.new(hostname) http.unlock('/todos/1', data)
Sends a LOCK request to the server; returns an instance of a subclass of Net::HTTPResponse.
The request is based on the Net::HTTP::Lock object created from string path, string body, and initial headers hash initheader.
data = '{"userId": 1, "id": 1, "title": "delectus aut autem", "completed": false}' http = Net::HTTP.new(hostname) http.lock('/todos/1', data)
Sends an UNLOCK request to the server; returns an instance of a subclass of Net::HTTPResponse.
The request is based on the Net::HTTP::Unlock object created from string path, string body, and initial headers hash initheader.
data = '{"userId": 1, "id": 1, "title": "delectus aut autem", "completed": false}' http = Net::HTTP.new(hostname) http.unlock('/todos/1', data)