Sets self to consider only identity in comparing keys; two keys are considered the same only if they are the same object; returns self.
By default, these two object are considered to be the same key, so s1 will overwrite s0:
s0 = 'x' s1 = 'x' h = {} h.compare_by_identity? # => false h[s0] = 0 h[s1] = 1 h # => {"x"=>1}
After calling #compare_by_identity, the keys are considered to be different, and therefore do not overwrite each other:
h = {} h.compare_by_identity # => {} h.compare_by_identity? # => true h[s0] = 0 h[s1] = 1 h # => {"x"=>0, "x"=>1}
Returns true if compare_by_identity has been called, false otherwise.
Checks if a given hash is flagged by Module#ruby2_keywords (or Proc#ruby2_keywords). This method is not for casual use; debugging, researching, and some truly necessary cases like serialization of arguments.
ruby2_keywords def foo(*args) Hash.ruby2_keywords_hash?(args.last) end foo(k: 1) #=> true foo({k: 1}) #=> false
Duplicates a given hash and adds a ruby2_keywords flag. This method is not for casual use; debugging, researching, and some truly necessary cases like deserialization of arguments.
h = {k: 1} h = Hash.ruby2_keywords_hash(h) def foo(k: 42) k end foo(*[h]) #=> 1 with neither a warning or an error
Returns IO instance tied to ARGF for writing if inplace mode is enabled.
Render a template on a new toplevel binding with local variables specified by a Hash object.
Creates an option from the given parameters params. See Parameters for New Options.
The block, if given, is the handler for the created option. When the option is encountered during command-line parsing, the block is called with the argument given for the option, if any. See Option Handlers.
Task description for the rerdoc task or its renamed description
Returns the status of the global “abort on exception” condition.
The default is false.
When set to true, if any thread is aborted by an exception, the raised exception will be re-raised in the main thread.
Can also be specified by the global $DEBUG flag or command line option -d.
See also ::abort_on_exception=.
There is also an instance level method to set this for a specific thread, see abort_on_exception.
When set to true, if any thread is aborted by an exception, the raised exception will be re-raised in the main thread. Returns the new state.
Thread.abort_on_exception = true t1 = Thread.new do puts "In new thread" raise "Exception from thread" end sleep(1) puts "not reached"
This will produce:
In new thread prog.rb:4: Exception from thread (RuntimeError) from prog.rb:2:in `initialize' from prog.rb:2:in `new' from prog.rb:2
See also ::abort_on_exception.
There is also an instance level method to set this for a specific thread, see abort_on_exception=.
Returns the value of a thread local variable that has been set. Note that these are different than fiber local values. For fiber local values, please see Thread#[] and Thread#[]=.
Thread local values are carried along with threads, and do not respect fibers. For example:
Thread.new { Thread.current.thread_variable_set("foo", "bar") # set a thread local Thread.current["foo"] = "bar" # set a fiber local Fiber.new { Fiber.yield [ Thread.current.thread_variable_get("foo"), # get the thread local Thread.current["foo"], # get the fiber local ] }.resume }.join.value # => ['bar', nil]
The value “bar” is returned for the thread local, where nil is returned for the fiber local. The fiber is executed in the same thread, so the thread local values are available.
Sets a thread local with key to value. Note that these are local to threads, and not to fibers. Please see Thread#thread_variable_get and Thread#[] for more information.
Returns the status of the thread-local “abort on exception” condition for this thr.
The default is false.
See also abort_on_exception=.
There is also a class level method to set this for all threads, see ::abort_on_exception.
When set to true, if this thr is aborted by an exception, the raised exception will be re-raised in the main thread.
See also abort_on_exception.
There is also a class level method to set this for all threads, see ::abort_on_exception=.
Return the native thread ID which is used by the Ruby thread.
The ID depends on the OS. (not POSIX thread ID returned by pthread_self(3))
On Linux it is TID returned by gettid(2).
On macOS it is the system-wide unique integral ID of thread returned by pthread_threadid_np(3).
On FreeBSD it is the unique integral ID of the thread returned by pthread_getthreadid_np(3).
On Windows it is the thread identifier returned by GetThreadId().
On other platforms, it raises NotImplementedError.
NOTE: If the thread is not associated yet or already deassociated with a native thread, it returns nil. If the Ruby implementation uses M:N thread model, the ID may change depending on the timing.
Return all reachable objects from ‘obj’.
This method returns all reachable objects from ‘obj’.
If ‘obj’ has two or more references to the same object ‘x’, then returned array only includes one ‘x’ object.
If ‘obj’ is a non-markable (non-heap management) object such as true, false, nil, symbols and Fixnums (and Flonum) then it simply returns nil.
If ‘obj’ has references to an internal object, then it returns instances of ObjectSpace::InternalObjectWrapper class. This object contains a reference to an internal object and you can check the type of internal object with ‘type’ method.
If ‘obj’ is instance of ObjectSpace::InternalObjectWrapper class, then this method returns all reachable object from an internal object, which is pointed by ‘obj’.
With this method, you can find memory leaks.
This method is only expected to work except with C Ruby.
Example:
ObjectSpace.reachable_objects_from(['a', 'b', 'c']) #=> [Array, 'a', 'b', 'c'] ObjectSpace.reachable_objects_from(['a', 'a', 'a']) #=> [Array, 'a', 'a', 'a'] # all 'a' strings have different object id ObjectSpace.reachable_objects_from([v = 'a', v, v]) #=> [Array, 'a'] ObjectSpace.reachable_objects_from(1) #=> nil # 1 is not markable (heap managed) object
Calls CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON). Starts tracking memory allocations. See also OpenSSL.print_mem_leaks.
This is available only when built with a capable OpenSSL and –enable-debug configure option.
Set terminal size to rows and columns.
See GNU Readline’s rl_set_screen_size function.
Raises NotImplementedError if the using readline library does not support.
Returns the terminal’s rows and columns.
See GNU Readline’s rl_get_screen_size function.
Raises NotImplementedError if the using readline library does not support.
Specifies a Proc object proc to call after the first prompt has been printed and just before readline starts reading input characters.
See GNU Readline’s rl_pre_input_hook variable.
Raises ArgumentError if proc does not respond to the call method.
Raises NotImplementedError if the using readline library does not support.
Returns a Proc object proc to call after the first prompt has been printed and just before readline starts reading input characters. The default is nil.
Raises NotImplementedError if the using readline library does not support.
Verify internal consistency.
This method is implementation specific. Now this method checks generational consistency if RGenGC is supported.
Returns information about the most recent garbage collection.
If the optional argument, hash, is given, it is overwritten and returned. This is intended to avoid probe effect.
Returns information about object moved in the most recent GC compaction.
The returned hash has two keys :considered and :moved. The hash for :considered lists the number of objects that were considered for movement by the compactor, and the :moved hash lists the number of objects that were actually moved. Some objects can’t be moved (maybe they were pinned) so these numbers can be used to calculate compaction efficiency.