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 status of the global “report on exception” condition.
The default is true since Ruby 2.5.
All threads created when this flag is true will report a message on $stderr if an exception kills the thread.
Thread.new { 1.times { raise } }
will produce this output on $stderr:
#<Thread:...> terminated with exception (report_on_exception is true):
Traceback (most recent call last):
2: from -e:1:in `block in <main>'
1: from -e:1:in `times'
This is done to catch errors in threads early. In some cases, you might not want this output. There are multiple ways to avoid the extra output:
If the exception is not intended, the best is to fix the cause of the exception so it does not happen anymore.
If the exception is intended, it might be better to rescue it closer to where it is raised rather then let it kill the Thread.
If it is guaranteed the Thread will be joined with Thread#join or Thread#value, then it is safe to disable this report with Thread.current.report_on_exception = false when starting the Thread. However, this might handle the exception much later, or not at all if the Thread is never joined due to the parent thread being blocked, etc.
See also ::report_on_exception=.
There is also an instance level method to set this for a specific thread, see report_on_exception=.
Returns the new state. When set to true, all threads created afterwards will inherit the condition and report a message on $stderr if an exception kills a thread:
Thread.report_on_exception = true t1 = Thread.new do puts "In new thread" raise "Exception from thread" end sleep(1) puts "In the main thread"
This will produce:
In new thread #<Thread:...prog.rb:2> terminated with exception (report_on_exception is true): Traceback (most recent call last): prog.rb:4:in `block in <main>': Exception from thread (RuntimeError) In the main thread
See also ::report_on_exception.
There is also an instance level method to set this for a specific thread, see report_on_exception=.
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=.
Returns the status of the thread-local “report on exception” condition for this thr.
The default value when creating a Thread is the value of the global flag Thread.report_on_exception.
See also report_on_exception=.
There is also a class level method to set this for all new threads, see ::report_on_exception=.
When set to true, a message is printed on $stderr if an exception kills this thr. See ::report_on_exception for details.
See also report_on_exception.
There is also a class level method to set this for all new threads, see ::report_on_exception=.
With a block given, calls the block with each repeated permutation of length size of the elements of self; each permutation is an array; returns self. The order of the permutations is indeterminate.
If a positive integer argument size is given, calls the block with each size-tuple repeated permutation of the elements of self. The number of permutations is self.size**size.
Examples:
size is 1:
p = [] [0, 1, 2].repeated_permutation(1) {|permutation| p.push(permutation) } p # => [[0], [1], [2]]
size is 2:
p = [] [0, 1, 2].repeated_permutation(2) {|permutation| p.push(permutation) } p # => [[0, 0], [0, 1], [0, 2], [1, 0], [1, 1], [1, 2], [2, 0], [2, 1], [2, 2]]
If size is zero, calls the block once with an empty array.
If size is negative, does not call the block:
[0, 1, 2].repeated_permutation(-1) {|permutation| fail 'Cannot happen' }
With no block given, returns a new Enumerator.
Related: see Methods for Combining.
Return the accept character set for all new CGI instances.
Returns the fractional part of the second in range (Rational(0, 1)…Rational(1, 1)):
DateTime.new(2001, 2, 3, 4, 5, 6.5).sec_fraction # => (1/2)
Returns the sharing detection flag as a boolean value. It is false (nil) by default.
Sets the sharing detection flag to b.
Returns the compiled instruction sequence represented by a RubyVM::InstructionSequence instance on the :script_compiled event.
Note that this method is CRuby-specific.
Returns the current execution stack—an array containing backtrace location objects.
See Thread::Backtrace::Location for more information.
The optional start parameter determines the number of initial stack entries to omit from the top of the stack.
A second optional length parameter can be used to limit how many entries are returned from the stack.
Returns nil if start is greater than the size of current execution stack.
Optionally you can pass a range, which will return an array containing the entries within the specified range.
Parse a file at filename. Returns the Psych::Nodes::Document.
Raises a Psych::SyntaxError when a YAML syntax error is detected.
Parse a YAML string in yaml. Returns the Psych::Nodes::Stream. This method can handle multiple YAML documents contained in yaml. filename is used in the exception message if a Psych::SyntaxError is raised.
If a block is given, a Psych::Nodes::Document node will be yielded to the block as it’s being parsed.
Raises a Psych::SyntaxError when a YAML syntax error is detected.
Example:
Psych.parse_stream("---\n - a\n - b") # => #<Psych::Nodes::Stream:0x00> Psych.parse_stream("--- a\n--- b") do |node| node # => #<Psych::Nodes::Document:0x00> end begin Psych.parse_stream("--- `", filename: "file.txt") rescue Psych::SyntaxError => ex ex.file # => 'file.txt' ex.message # => "(file.txt): found character that cannot start any token" end
Raises a TypeError when NilClass is passed.
See Psych::Nodes for more information about YAML AST.
Returns the version of libyaml being used
Returns the string which represents the version of zlib library.
A Gem::Version for the currently running Ruby.
A Gem::Version for the currently running RubyGems
Mirror the Prism.parse_file API by using the serialization API. This uses native strings instead of Ruby strings because it allows us to use mmap when it is available.
Mirror the Prism.parse_stream API by using the serialization API.