tools/perf/util/rwsem.c

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

File Facts

System
Linux kernel
Corpus path
tools/perf/util/rwsem.c
Extension
.c
Size
1273 bytes
Lines
72
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 "util.h"
#include "rwsem.h"

#if RWS_ERRORCHECK
#include "mutex.h"
#endif

int init_rwsem(struct rw_semaphore *sem)
{
#if RWS_ERRORCHECK
	mutex_init(&sem->mtx);
	return 0;
#else
	return pthread_rwlock_init(&sem->lock, NULL);
#endif
}

int exit_rwsem(struct rw_semaphore *sem)
{
#if RWS_ERRORCHECK
	mutex_destroy(&sem->mtx);
	return 0;
#else
	return pthread_rwlock_destroy(&sem->lock);
#endif
}

int down_read(struct rw_semaphore *sem)
	NO_THREAD_SAFETY_ANALYSIS
{
#if RWS_ERRORCHECK
	mutex_lock(&sem->mtx);
	return 0;
#else
	return perf_singlethreaded ? 0 : pthread_rwlock_rdlock(&sem->lock);
#endif
}

int up_read(struct rw_semaphore *sem)
	NO_THREAD_SAFETY_ANALYSIS
{
#if RWS_ERRORCHECK
	mutex_unlock(&sem->mtx);
	return 0;
#else
	return perf_singlethreaded ? 0 : pthread_rwlock_unlock(&sem->lock);
#endif
}

int down_write(struct rw_semaphore *sem)
	NO_THREAD_SAFETY_ANALYSIS
{
#if RWS_ERRORCHECK
	mutex_lock(&sem->mtx);
	return 0;
#else
	return perf_singlethreaded ? 0 : pthread_rwlock_wrlock(&sem->lock);
#endif
}

int up_write(struct rw_semaphore *sem)
	NO_THREAD_SAFETY_ANALYSIS
{
#if RWS_ERRORCHECK
	mutex_unlock(&sem->mtx);
	return 0;
#else
	return perf_singlethreaded ? 0 : pthread_rwlock_unlock(&sem->lock);
#endif
}

Annotation

Implementation Notes