Resguardo inicial

linux-7.2.3/tools/perf/util/sharded_mutex.c

@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "sharded_mutex.h"
+
+#include <stdlib.h>
+
+struct sharded_mutex *sharded_mutex__new(size_t num_shards)
+{
+	struct sharded_mutex *result;
+	size_t size;
+	unsigned int bits;
+
+	for (bits = 0; ((size_t)1 << bits) < num_shards; bits++)
+		;
+
+	size = sizeof(*result) + sizeof(struct mutex) * (1 << bits);
+	result = malloc(size);
+	if (!result)
+		return NULL;
+
+	result->cap_bits = bits;
+	for (size_t i = 0; i < ((size_t)1 << bits); i++)
+		mutex_init(&result->mutexes[i]);
+
+	return result;
+}
+
+void sharded_mutex__delete(struct sharded_mutex *sm)
+{
+	for (size_t i = 0; i < ((size_t)1 << sm->cap_bits); i++)
+		mutex_destroy(&sm->mutexes[i]);
+
+	free(sm);
+}