https://bz.apache.org/bugzilla/show_bug.cgi?id=58744
Bug ID: 58744
Summary: pthread mutex warning is outdated
Product: Apache httpd-2
Version: 2.5-HEAD
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Documentation
Assignee: docs@httpd.apache.org
Reporter: d...@axtens.net
In documentation for the core module (manual/mod/core.xml), there's a very
prominent warning about the safety of pthread mutexes:
"On most systems, if a child process terminates abnormally while holding a
mutex that uses this implementation, the server will deadlock and stop
responding to requests. When this occurs, the server will require a manual
restart to recover.
Solaris is a notable exception as it provides a mechanism which usually allows
the mutex to be recovered after a child process terminates abnormally while
holding a mutex.
If your system implements the pthread_mutexattr_setrobust_np() function, you
may be able to use the pthread option safely."
Linux has supported robust pthread mutexes for quite some time:
Documentation/robust-futexes.txt went into the kernel in 2006, and man pages
for pthread_mutexattr_setrobust_np were added in ~2008.
There may well be systems that still don't support it, so the warning should
probably still stay, but could you please add Linux to the list of systems
where it's safe?
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