mirror of /home/gitosis/repositories/libev.git
*** empty log message ***
Marc Alexander Lehmann
parent
3895fc3440
commit
34c32ad678
2
Changes
2
Changes
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@ -1,5 +1,7 @@
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Revision history for libev, a high-performance and full-featured event loop.
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4.26 (no standalone release)
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- update to libec 0x00010006.
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- new experimental linux aio backend (linux 4.18+).
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- removed redundant 0-ptr check in ev_once.
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- updated/extended ev_set_allocator documentation.
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26
ev.c
26
ev.c
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@ -561,7 +561,7 @@ struct signalfd_siginfo
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#define ECB_H
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/* 16 bits major, 16 bits minor */
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#define ECB_VERSION 0x00010005
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#define ECB_VERSION 0x00010006
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#ifdef _WIN32
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typedef signed char int8_t;
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@ -685,6 +685,7 @@ struct signalfd_siginfo
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#ifndef ECB_MEMORY_FENCE
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#if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
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#define ECB_MEMORY_FENCE_RELAXED __asm__ __volatile__ ("" : : : "memory")
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#if __i386 || __i386__
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#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
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#define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
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@ -744,12 +745,14 @@ struct signalfd_siginfo
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#define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
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#define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
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#define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
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#define ECB_MEMORY_FENCE_RELAXED __atomic_thread_fence (__ATOMIC_RELAXED)
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#elif ECB_CLANG_EXTENSION(c_atomic)
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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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#define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
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#define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
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#define ECB_MEMORY_FENCE_RELAXED __c11_atomic_thread_fence (__ATOMIC_RELAXED)
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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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@ -769,9 +772,10 @@ struct signalfd_siginfo
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#define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
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#elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
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#include <mbarrier.h>
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#define ECB_MEMORY_FENCE __machine_rw_barrier ()
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#define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
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#define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
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#define ECB_MEMORY_FENCE __machine_rw_barrier ()
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#define ECB_MEMORY_FENCE_ACQUIRE __machine_acq_barrier ()
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#define ECB_MEMORY_FENCE_RELEASE __machine_rel_barrier ()
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#define ECB_MEMORY_FENCE_RELAXED __compiler_barrier ()
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#elif __xlC__
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#define ECB_MEMORY_FENCE __sync ()
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#endif
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@ -782,15 +786,9 @@ 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, 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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/* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
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/* for all __atomic_thread_fence's except seq_cst */
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#define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
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#define ECB_MEMORY_FENCE_ACQUIRE atomic_thread_fence (memory_order_acquire)
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#define ECB_MEMORY_FENCE_RELEASE atomic_thread_fence (memory_order_release)
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#endif
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#endif
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@ -820,6 +818,10 @@ struct signalfd_siginfo
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#define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
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#endif
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#if !defined ECB_MEMORY_FENCE_RELAXED && defined ECB_MEMORY_FENCE
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#define ECB_MEMORY_FENCE_RELAXED ECB_MEMORY_FENCE /* very heavy-handed */
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#endif
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/*****************************************************************************/
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#if ECB_CPP
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2
ev.h
2
ev.h
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@ -212,7 +212,7 @@ struct ev_loop;
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/*****************************************************************************/
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#define EV_VERSION_MAJOR 4
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#define EV_VERSION_MINOR 25
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#define EV_VERSION_MINOR 26
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/* eventmask, revents, events... */
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enum {
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@ -301,8 +301,7 @@ linuxaio_get_events_from_ring (EV_P)
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linuxaio_parse_events (EV_A_ ring->io_events, tail);
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}
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/* TODO: we only need a compiler barrier here, not a read fence */
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ECB_MEMORY_FENCE_RELEASE;
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ECB_MEMORY_FENCE_RELAXED;
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/* as an extension to C, we hope that the volatile will make this atomic and once-only */
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*(volatile unsigned *)&ring->head = tail;
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/* make sure kernel can see our new head value - probably not required */
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