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ebc7135f8e
Summary: TestExitDuringStep was very rarely hanging on the buildbots. I can't be sure, but I believe this was because of the fact that it declared its pseudo_barrier variable as "volatile int", which is not sufficient to guarantee corectness (also, all other tests used atomic variables for this, and they were passing reliably AFAIK). Besides switching to an atomic variable in this test as well, I have also took this opportunity to unify all the copies of the pseudo_barrier code to a single place to reduce the chance of this happening again. Reviewers: clayborg Subscribers: lldb-commits Differential Revision: http://reviews.llvm.org/D20065 llvm-svn: 269025
68 lines
2.6 KiB
C++
68 lines
2.6 KiB
C++
// This header is included in all the test programs (C and C++) and provides a
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// hook for dealing with platform-specifics.
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#if defined(_WIN32) || defined(_WIN64)
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#ifdef COMPILING_LLDB_TEST_DLL
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#define LLDB_TEST_API __declspec(dllexport)
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#else
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#define LLDB_TEST_API __declspec(dllimport)
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#endif
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#else
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#define LLDB_TEST_API
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#endif
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#if defined(__cplusplus) && defined(_MSC_VER) && (_HAS_EXCEPTIONS == 0)
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// Compiling MSVC libraries with _HAS_EXCEPTIONS=0, eliminates most but not all
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// calls to __uncaught_exception. Unfortunately, it does seem to eliminate
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// the delcaration of __uncaught_excpeiton. Including <eh.h> ensures that it is
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// declared. This may not be necessary after MSVC 12.
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#include <eh.h>
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#endif
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// On some systems (e.g., some versions of linux) it is not possible to attach to a process
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// without it giving us special permissions. This defines the lldb_enable_attach macro, which
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// should perform any such actions, if needed by the platform. This is a macro instead of a
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// function to avoid the need for complex linking of the test programs.
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#if defined(__linux__)
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#include <sys/prctl.h>
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#if defined(PR_SET_PTRACER) && defined(PR_SET_PTRACER_ANY)
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// For now we execute on best effort basis. If this fails for some reason, so be it.
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#define lldb_enable_attach() \
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do \
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{ \
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const int prctl_result = prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY, 0, 0, 0); \
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(void)prctl_result; \
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} while (0)
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#endif
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#else // not linux
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#define lldb_enable_attach()
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#endif
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#ifdef __cplusplus
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#include <atomic>
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// Note that although hogging the CPU while waiting for a variable to change
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// would be terrible in production code, it's great for testing since it
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// avoids a lot of messy context switching to get multiple threads synchronized.
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typedef std::atomic<int> pseudo_barrier_t;
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#define pseudo_barrier_wait(barrier) \
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do \
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{ \
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--(barrier); \
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while ((barrier).load() > 0) \
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; \
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} while (0)
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#define pseudo_barrier_init(barrier, count) \
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do \
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{ \
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(barrier) = (count); \
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} while (0)
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#endif // __cplusplus
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