https://bz.apache.org/bugzilla/show_bug.cgi?id=58285
Bug ID: 58285
Summary: Atomics missing - undefined symbol
__sync_sub_and_fetch_4
Product: Tomcat Connectors
Version: 1.2.41
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: Common
Assignee: dev@tomcat.apache.org
Reporter: rainer.j...@kippdata.de
Connectors 1.2.41 introduced the use of atomics. When using GCC 4.1 or newer,
support for atomics is assumed, but actually on some platforms not available.
For platforms where gcc does not support atomics, it compiles in a function
call to e.g. __sync_add_and_fetch_4() and trying to load mod_jk.so results in
an undefined symbol error for __sync_add_and_fetch_4.
This should not happen on the Windows platform, where we use another atomics
implementation. It should also not happen for AMD 64 processors, because GCC
4.1 and later implement atomics for them.
It does happen in x86 32 Bit processors at least for old GCC and also on
Solaris Sparc for GCC 4.1.2 (not for 4.2.4 and later).
This will be fixed by using a configure auto-detection for atomics support. If
support is not detected, and we are not on WIN32, we fall back to APR provided
atomics. If APR is not available, we fall back to non-atomic
increment/decrement plus a startup warning.
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