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Sync 9.2 and 9.3 versions of barrier.h with 9.4's version.

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We weren't particularly maintaining barrier.h before 9.4, because nothing
was using it in those branches.  Well, nothing until commit 37de8de9e got
back-patched.  That broke 9.2 and 9.3 for some non-mainstream platforms
that we haven't been testing in the buildfarm, including icc on ia64,
HPPA, and Alpha.

This commit effectively back-patches commits e5592c61a, 89779bf2c,
and 747ca6697, though I did it just by copying the file (less copyright
date updates) rather than by cherry-picking those commits.

Per an attempt to run gaur and pademelon over old branches they've
not been run on since ~2013.
This commit is contained in:
Tom Lane 2016-04-15 16:49:48 -04:00
parent b54508596d
commit d7dbc882d3
1 changed files with 11 additions and 2 deletions
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13
src/include/storage/barrier.h
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@ -53,7 +53,12 @@ extern slock_t dummy_spinlock;
/*
* icc defines __GNUC__, but doesn't support gcc's inline asm syntax
*/
#if defined(__ia64__) || defined(__ia64)
#define pg_memory_barrier() __mf()
#elif defined(__i386__) || defined(__x86_64__)
#define pg_memory_barrier() _mm_mfence()
#endif
#define pg_compiler_barrier() __memory_barrier()
#elif defined(__GNUC__)
@ -112,8 +117,12 @@ extern slock_t dummy_spinlock;
* read barrier to cover that case. We might need to add that later.
*/
#define pg_memory_barrier() __asm__ __volatile__ ("mb" : : : "memory")
#define pg_read_barrier() __asm__ __volatile__ ("rmb" : : : "memory")
#define pg_read_barrier() __asm__ __volatile__ ("mb" : : : "memory")
#define pg_write_barrier() __asm__ __volatile__ ("wmb" : : : "memory")
#elif defined(__hppa) || defined(__hppa__) /* HP PA-RISC */
/* HPPA doesn't do either read or write reordering */
#define pg_memory_barrier() pg_compiler_barrier()
#elif __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)
/*
@ -148,7 +157,7 @@ extern slock_t dummy_spinlock;
* fence. But all of our actual implementations seem OK in this regard.
*/
#if !defined(pg_memory_barrier)
#define pg_memory_barrier(x) \
#define pg_memory_barrier() \
do { S_LOCK(&dummy_spinlock); S_UNLOCK(&dummy_spinlock); } while (0)
#endif