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author | normal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2018-06-27 03:14:30 +0000 |
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committer | normal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2018-06-27 03:14:30 +0000 |
commit | 054a412d540e7ed2de63d68da753f585ea6616c3 (patch) | |
tree | 550ff5e80d4735d7a5c3f05605a180cfcba526b2 /configure.ac | |
parent | e3e22c551d24829e0f9ce84afd3653867582034b (diff) | |
download | ruby-054a412d540e7ed2de63d68da753f585ea6616c3.tar.gz |
hijack SIGCHLD handler for internal use
Use a global SIGCHLD handler to guard all callers of rb_waitpid.
To work safely with multi-threaded programs, we introduce a
VM-wide waitpid_lock to be acquired BEFORE fork/vfork spawns the
process. This is to be combined with the new ruby_waitpid_locked
function used by mjit.c in a non-Ruby thread.
Ruby-level SIGCHLD handlers registered with Signal.trap(:CHLD)
continues to work as before and there should be no regressions
in any existing use cases.
Splitting the wait queues for PID > 0 and groups (PID <= 0)
ensures we favor PID > 0 callers.
The disabling of SIGCHLD in rb_f_system is longer necessary,
as we use deferred signal handling and no longer make ANY
blocking waitpid syscalls in other threads which could "beat"
the waitpid call made by rb_f_system.
We prevent SIGCHLD from firing in normal Ruby Threads and only
enable it in the timer-thread, to prevent spurious wakeups
from in test/-ext-/gvl/test_last_thread.rb with MJIT enabled.
I've tried to guard as much of the code for RUBY_SIGCHLD==0
using C "if" statements rather than CPP "#if" so to reduce
the likelyhood of portability problems as the compiler will
see more code.
We also work to suppress false-positives from
Process.wait(-1, Process::WNOHANG) to quiets warnings from
spec/ruby/core/process/wait2_spec.rb with MJIT enabled.
Lastly, we must implement rb_grantpt for ext/pty. We need a
MJIT-compatible way of supporting grantpt(3) which may spawn
the `pt_chown' binary and call waitpid(2) on it.
[ruby-core:87605] [Ruby trunk Bug#14867]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63758 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'configure.ac')
-rw-r--r-- | configure.ac | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index d9283d9e17..f48db0733c 100644 --- a/configure.ac +++ b/configure.ac @@ -1782,6 +1782,7 @@ AC_CHECK_FUNCS(getsid) AC_CHECK_FUNCS(gettimeofday) # for making ac_cv_func_gettimeofday AC_CHECK_FUNCS(getuidx) AC_CHECK_FUNCS(gmtime_r) +AC_CHECK_FUNCS(grantpt) AC_CHECK_FUNCS(initgroups) AC_CHECK_FUNCS(ioctl) AC_CHECK_FUNCS(isfinite) |