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authorRickard Green <[email protected]>2010-06-17 10:23:50 +0200
committerRickard Green <[email protected]>2010-08-10 11:41:14 +0200
commit300b419486c1ca88e33938f182d5d5a8b90fb73f (patch)
tree55c37d5fb042bf6b3b5f56d89c9238a7e22f8b29 /erts/include/internal/sparc32/atomic.h
parentc1e94fa9a6fe4ae717d35dfbd1b628dc2e06d26a (diff)
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Rewrite ethread library
Large parts of the ethread library have been rewritten. The ethread library is an Erlang runtime system internal, portable thread library used by the runtime system itself. Most notable improvement is a reader optimized rwlock implementation which dramatically improve the performance of read-lock/read-unlock operations on multi processor systems by avoiding ping-ponging of the rwlock cache lines. The reader optimized rwlock implementation is used by miscellaneous rwlocks in the runtime system that are known to be read-locked frequently, and can be enabled on ETS tables by passing the `{read_concurrency, true}' option upon table creation. See the documentation of `ets:new/2' for more information. The ethread library can now also use the libatomic_ops library for atomic memory accesses. This makes it possible for the Erlang runtime system to utilize optimized atomic operations on more platforms than before. Use the `--with-libatomic_ops=PATH' configure command line argument when specifying where the libatomic_ops installation is located. The libatomic_ops library can be downloaded from: http://www.hpl.hp.com/research/linux/atomic_ops/ The changed API of the ethread library has also caused modifications in the Erlang runtime system. Preparations for the to come "delayed deallocation" feature has also been done since it depends on the ethread library. Note: When building for x86, the ethread library will now use instructions that first appeared on the pentium 4 processor. If you want the runtime system to be compatible with older processors (back to 486) you need to pass the `--enable-ethread-pre-pentium4-compatibility' configure command line argument when configuring the system.
Diffstat (limited to 'erts/include/internal/sparc32/atomic.h')
-rw-r--r--erts/include/internal/sparc32/atomic.h39
1 files changed, 38 insertions, 1 deletions
diff --git a/erts/include/internal/sparc32/atomic.h b/erts/include/internal/sparc32/atomic.h
index 8fde449a52..2a995d4465 100644
--- a/erts/include/internal/sparc32/atomic.h
+++ b/erts/include/internal/sparc32/atomic.h
@@ -32,7 +32,7 @@ typedef struct {
__asm__ __volatile__("membar #LoadLoad|#LoadStore|#StoreLoad|#StoreStore\n" \
: : : "memory")
-#ifdef ETHR_TRY_INLINE_FUNCS
+#if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_AUX_IMPL__)
#if defined(__arch64__)
#define CASX "casx"
@@ -172,6 +172,43 @@ ethr_native_atomic_cmpxchg(ethr_native_atomic_t *var, long new, long old)
return new;
}
+/*
+ * Atomic ops with at least specified barriers.
+ */
+
+static ETHR_INLINE long
+ethr_native_atomic_read_acqb(ethr_native_atomic_t *var)
+{
+ long res = ethr_native_atomic_read(var);
+ __asm__ __volatile__("membar #StoreLoad|#StoreStore");
+ return res;
+}
+
+static ETHR_INLINE void
+ethr_native_atomic_set_relb(ethr_native_atomic_t *var, long i)
+{
+ __asm__ __volatile__("membar #LoadStore|#StoreStore");
+ ethr_native_atomic_set(var, i);
+}
+
+static ETHR_INLINE void
+ethr_native_atomic_dec_relb(ethr_native_atomic_t *var)
+{
+ __asm__ __volatile__("membar #LoadStore|#StoreStore");
+ ethr_native_atomic_dec(var);
+}
+
+static ETHR_INLINE long
+ethr_native_atomic_dec_return_relb(ethr_native_atomic_t *var)
+{
+ __asm__ __volatile__("membar #LoadStore|#StoreStore");
+ return ethr_native_atomic_dec_return(var);
+}
+
+#define ethr_native_atomic_inc_return_acqb ethr_native_atomic_inc_return
+#define ethr_native_atomic_cmpxchg_acqb ethr_native_atomic_cmpxchg
+#define ethr_native_atomic_cmpxchg_relb ethr_native_atomic_cmpxchg
+
#endif /* ETHR_TRY_INLINE_FUNCS */
#endif /* ETHR_SPARC32_ATOMIC_H */