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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/emulator/sys
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/emulator/sys')
-rw-r--r--erts/emulator/sys/unix/sys.c19
-rw-r--r--erts/emulator/sys/win32/sys.c18
2 files changed, 3 insertions, 34 deletions
diff --git a/erts/emulator/sys/unix/sys.c b/erts/emulator/sys/unix/sys.c
index 737ffd9f94..400ef6c0ce 100644
--- a/erts/emulator/sys/unix/sys.c
+++ b/erts/emulator/sys/unix/sys.c
@@ -384,18 +384,6 @@ MALLOC_USE_HASH(1);
#endif
#ifdef USE_THREADS
-static void *ethr_internal_alloc(size_t size)
-{
- return erts_alloc_fnf(ERTS_ALC_T_ETHR_INTERNAL, (Uint) size);
-}
-static void *ethr_internal_realloc(void *ptr, size_t size)
-{
- return erts_realloc_fnf(ERTS_ALC_T_ETHR_INTERNAL, ptr, (Uint) size);
-}
-static void ethr_internal_free(void *ptr)
-{
- erts_free(ERTS_ALC_T_ETHR_INTERNAL, ptr);
-}
#ifdef ERTS_THR_HAVE_SIG_FUNCS
/*
@@ -488,9 +476,6 @@ erts_sys_pre_init(void)
#ifdef USE_THREADS
{
erts_thr_init_data_t eid = ERTS_THR_INIT_DATA_DEF_INITER;
- eid.alloc = ethr_internal_alloc;
- eid.realloc = ethr_internal_realloc;
- eid.free = ethr_internal_free;
eid.thread_create_child_func = thr_create_prepare_child;
/* Before creation in parent */
@@ -538,13 +523,14 @@ erts_sys_pre_init(void)
#endif
#endif /* USE_THREADS */
erts_smp_atomic_init(&sys_misc_mem_sz, 0);
- erts_smp_rwmtx_init(&environ_rwmtx, "environ");
}
void
erl_sys_init(void)
{
+ erts_smp_rwmtx_init(&environ_rwmtx, "environ");
#if !DISABLE_VFORK
+ {
int res;
char bindir[MAXPATHLEN];
size_t bindirsz = sizeof(bindir);
@@ -574,6 +560,7 @@ erl_sys_init(void)
bindir,
DIR_SEPARATOR_CHAR,
CHILD_SETUP_PROG_NAME);
+ }
#endif
#ifdef USE_SETLINEBUF
diff --git a/erts/emulator/sys/win32/sys.c b/erts/emulator/sys/win32/sys.c
index bd02cf85eb..54f71b202d 100644
--- a/erts/emulator/sys/win32/sys.c
+++ b/erts/emulator/sys/win32/sys.c
@@ -2974,19 +2974,6 @@ check_supported_os_version(void)
}
#ifdef USE_THREADS
-static void *ethr_internal_alloc(size_t size)
-{
- return erts_alloc_fnf(ERTS_ALC_T_ETHR_INTERNAL, (Uint) size);
-}
-static void *ethr_internal_realloc(void *ptr, size_t size)
-{
- return erts_realloc_fnf(ERTS_ALC_T_ETHR_INTERNAL, ptr, (Uint) size);
-}
-static void ethr_internal_free(void *ptr)
-{
- erts_free(ERTS_ALC_T_ETHR_INTERNAL, ptr);
-}
-
#ifdef ERTS_ENABLE_LOCK_COUNT
static void
thr_create_prepare_child(void *vtcdp)
@@ -3005,14 +2992,9 @@ erts_sys_pre_init(void)
#ifdef USE_THREADS
{
erts_thr_init_data_t eid = ERTS_THR_INIT_DATA_DEF_INITER;
- eid.alloc = ethr_internal_alloc;
- eid.realloc = ethr_internal_realloc;
- eid.free = ethr_internal_free;
-
#ifdef ERTS_ENABLE_LOCK_COUNT
eid.thread_create_child_func = thr_create_prepare_child;
#endif
-
erts_thr_init(&eid);
#ifdef ERTS_ENABLE_LOCK_COUNT
erts_lcnt_init();