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authorRickard Green <[email protected]>2013-09-11 21:49:32 +0200
committerRickard Green <[email protected]>2013-09-25 16:24:31 +0200
commitcabfe2cdc0b8d879431f81233addd2a43ff1f742 (patch)
tree8971e09324be75eefaa259acdf7cfcc91d9bf280 /erts/emulator/sys/unix
parentf083e4298d751bb564915b03f0c32114d533d086 (diff)
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Implement platform specific aligned sys_alloc and use when supported
erts_sys_aligned_alloc() is currently implemented using posix_memalign if it exist, or using _aligned_malloc on Windows. If erts_sys_aligned_alloc() exist allocators will create sys_alloc carriers similar to how this was done pre-R16.
Diffstat (limited to 'erts/emulator/sys/unix')
-rw-r--r--erts/emulator/sys/unix/erl_unix_sys.h4
-rw-r--r--erts/emulator/sys/unix/sys.c46
2 files changed, 50 insertions, 0 deletions
diff --git a/erts/emulator/sys/unix/erl_unix_sys.h b/erts/emulator/sys/unix/erl_unix_sys.h
index c8fcec8547..2c47aa06c2 100644
--- a/erts/emulator/sys/unix/erl_unix_sys.h
+++ b/erts/emulator/sys/unix/erl_unix_sys.h
@@ -107,6 +107,10 @@
#endif
#include <netdb.h>
+#ifdef HAVE_POSIX_MEMALIGN
+# define ERTS_HAVE_ERTS_SYS_ALIGNED_ALLOC 1
+#endif
+
/*
* Make sure that MAXPATHLEN is defined.
*/
diff --git a/erts/emulator/sys/unix/sys.c b/erts/emulator/sys/unix/sys.c
index a7ea4b2490..fdc3167c62 100644
--- a/erts/emulator/sys/unix/sys.c
+++ b/erts/emulator/sys/unix/sys.c
@@ -2524,6 +2524,52 @@ void erts_sys_alloc_init(void)
{
}
+#if ERTS_HAVE_ERTS_SYS_ALIGNED_ALLOC
+void *erts_sys_aligned_alloc(UWord alignment, UWord size)
+{
+#ifdef HAVE_POSIX_MEMALIGN
+ void *ptr = NULL;
+ int error;
+ ASSERT(alignment && (alignment & ~alignment) == 0); /* power of 2 */
+ error = posix_memalign(&ptr, (size_t) alignment, (size_t) size);
+#if HAVE_ERTS_MSEG
+ if (error || !ptr) {
+ erts_mseg_clear_cache();
+ error = posix_memalign(&ptr, (size_t) alignment, (size_t) size);
+ }
+#endif
+ if (error) {
+ errno = error;
+ return NULL;
+ }
+ if (!ptr)
+ errno = ENOMEM;
+ ASSERT(!ptr || (((UWord) ptr) & (alignment - 1)) == 0);
+ return ptr;
+#else
+# error "Missing erts_sys_aligned_alloc() implementation"
+#endif
+}
+
+void erts_sys_aligned_free(UWord alignment, void *ptr)
+{
+ ASSERT(alignment && (alignment & ~alignment) == 0); /* power of 2 */
+ free(ptr);
+}
+
+void *erts_sys_aligned_realloc(UWord alignment, void *ptr, UWord size, UWord old_size)
+{
+ void *new_ptr = erts_sys_aligned_alloc(alignment, size);
+ if (new_ptr) {
+ UWord copy_size = old_size < size ? old_size : size;
+ sys_memcpy(new_ptr, ptr, (size_t) copy_size);
+ erts_sys_aligned_free(alignment, ptr);
+ }
+ return new_ptr;
+}
+
+#endif
+
void *erts_sys_alloc(ErtsAlcType_t t, void *x, Uint sz)
{
void *res = malloc((size_t) sz);