tools/perf/util/sharded_mutex.c

Source file repositories/reference/linux-study-clean/tools/perf/util/sharded_mutex.c

File Facts

System
Linux kernel
Corpus path
tools/perf/util/sharded_mutex.c
Extension
.c
Size
684 bytes
Lines
34
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// 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);
}

Annotation

Implementation Notes