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@ -561,7 +561,6 @@ struct signalfd_siginfo
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#define ECB_C99 (__STDC_VERSION__ >= 199901L)
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#define ECB_C11 (__STDC_VERSION__ >= 201112L)
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#define ECB_CPP (__cplusplus+0)
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#define ECB_CPP98 (__cplusplus >= 199711L)
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#define ECB_CPP11 (__cplusplus >= 201103L)
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/*****************************************************************************/
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@ -616,10 +615,10 @@ struct signalfd_siginfo
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#ifndef ECB_MEMORY_FENCE
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#if ECB_GCC_VERSION(4,7)
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/* see comment below about the C11 memory model. in short - avoid */
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/* see comment below (stdatomic.h) about the C11 memory model. */
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#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
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#elif defined __clang && __has_feature (cxx_atomic)
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/* see above */
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/* see comment below (stdatomic.h) about the C11 memory model. */
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#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
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#elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
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#define ECB_MEMORY_FENCE __sync_synchronize ()
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@ -646,8 +645,12 @@ struct signalfd_siginfo
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/* we assume that these memory fences work on all variables/all memory accesses, */
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/* not just C11 atomics and atomic accesses */
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#include <stdatomic.h>
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/* unfortunately, the C11 memory model seems to be very limited, and unable to express */
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/* simple barrier semantics. That means we need to take out thor's hammer. */
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/* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
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/* any fence other than seq_cst, which isn't very efficient for us. */
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/* Why that is, we don't know - either the C11 memory model is quite useless */
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/* for most usages, or gcc and clang have a bug */
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/* I *currently* lean towards the latter, and inefficiently implement */
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/* all three of ecb's fences as a seq_cst fence */
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#define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
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#endif
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#endif
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@ -3137,7 +3140,7 @@ ev_run (EV_P_ int flags)
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pipe_write_wanted = 0; /* just an optimisation, no fence needed */
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MEMORY_FENCE_ACQUIRE;
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ECB_MEMORY_FENCE_ACQUIRE;
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if (pipe_write_skipped)
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{
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assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
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Marc Alexander Lehmann
11 years ago