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Diffstat (limited to 'libc/stdlib/malloc-930716/memalign.c')
-rw-r--r--libc/stdlib/malloc-930716/memalign.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/libc/stdlib/malloc-930716/memalign.c b/libc/stdlib/malloc-930716/memalign.c
new file mode 100644
index 000000000..eea460aad
--- /dev/null
+++ b/libc/stdlib/malloc-930716/memalign.c
@@ -0,0 +1,67 @@
+/* malloc.c - C standard library routine.
+ Copyright (c) 1989, 1993 Michael J. Haertel
+ You may redistribute this library under the terms of the
+ GNU Library General Public License (version 2 or any later
+ version) as published by the Free Software Foundation.
+ THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY EXPRESS OR IMPLIED
+ WARRANTY. IN PARTICULAR, THE AUTHOR MAKES NO REPRESENTATION OR
+ WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY OF THIS
+ SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. */
+
+#define _GNU_SOURCE
+#include <features.h>
+#include <limits.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "malloc.h"
+
+#ifdef __UCLIBC_HAS_THREADS__
+#include <pthread.h>
+extern pthread_mutex_t __malloclock;
+# define LOCK pthread_mutex_lock(&__malloclock)
+# define UNLOCK pthread_mutex_unlock(&__malloclock);
+#else
+# define LOCK
+# define UNLOCK
+#endif
+
+
+__ptr_t memalign (size_t alignment, size_t size)
+{
+ __ptr_t result;
+ unsigned long int adj;
+
+ result = malloc (size + alignment - 1);
+ if (result == NULL)
+ return NULL;
+ adj = (unsigned long int) ((unsigned long int) ((char *) result -
+ (char *) NULL)) % alignment;
+ if (adj != 0)
+ {
+ struct alignlist *l;
+ LOCK;
+ for (l = _aligned_blocks; l != NULL; l = l->next)
+ if (l->aligned == NULL)
+ /* This slot is free. Use it. */
+ break;
+ if (l == NULL)
+ {
+ l = (struct alignlist *) malloc (sizeof (struct alignlist));
+ if (l == NULL) {
+ __free_unlocked (result);
+ UNLOCK;
+ return NULL;
+ }
+ l->next = _aligned_blocks;
+ _aligned_blocks = l;
+ }
+ l->exact = result;
+ result = l->aligned = (char *) result + alignment - adj;
+ UNLOCK;
+ }
+
+ return result;
+}
+