Issue #7917 has been updated by hkmaly (Honza Maly).


What IS the recommended way to fix this if Mutex nor Thread are safe in signal handler? Also created question for what is safe in signal handler in general as #14222

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Bug #7917: Can't write to a Logger in a signal handler
https://bugs.ruby-lang.org/issues/7917#change-68596

* Author: mperham (Mike Perham)
* Status: Rejected
* Priority: Normal
* Assignee: kosaki (Motohiro KOSAKI)
* Target version: 2.1.0
* ruby -v: 2.0.0-rc2
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN
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Looks like Ruby 2.0 does not allow Mutex#lock within a signal handler.  This prevents Logger from working since it uses an underlying mutex.

log writing failed. can't be called from trap context
log writing failed. can't be called from trap context
log writing failed. can't be called from trap context
log writing failed. can't be called from trap context

Here's Ruby code which reproduces the problem:

require 'logger'

LOG = Logger.new(STDOUT)
LOG.info "Now logging!"

trap 'INT' do
  LOG.info "Hello"
end

sleep
LOG.info "Done"

Run it and hit Ctrl-C.



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