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Several static functions from the signal API can be invoked simultaneously; RemoveFileOnSignal for instance can be called indirectly by multiple parallel loadModule() invocations, which might lead to the assertion: Assertion failed: (NumRegisteredSignals < array_lengthof(RegisteredSignalInfo) && "Out of space for signal handlers!"), function RegisterHandler, file /llvm/lib/Support/Unix/Signals.inc, line 105. RemoveFileOnSignal calls RegisterHandlers(), which isn't currently mutex protected, leading to the behavior above. This potentially affect a few other users of RegisterHandlers() too. rdar://problem/30381224 llvm-svn: 298871
llvm/lib/Support/Unix README =========================== This directory provides implementations of the lib/System classes that are common to two or more variants of UNIX. For example, the directory structure underneath this directory could look like this: Unix - only code that is truly generic to all UNIX platforms Posix - code that is specific to Posix variants of UNIX SUS - code that is specific to the Single Unix Specification SysV - code that is specific to System V variants of UNIX As a rule, only those directories actually needing to be created should be created. Also, further subdirectories could be created to reflect versions of the various standards. For example, under SUS there could be v1, v2, and v3 subdirectories to reflect the three major versions of SUS.