perf mutex: Wrapped usage of mutex and cond (e57d8977) · Commits · EulixOS / Software / Kernel

tools/perf/util/Build

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		@@ -143,6 +143,7 @@ perf-y += branch.o
		perf-y += mem2node.o
		perf-y += clockid.o
		perf-y += list_sort.o
		perf-y += mutex.o

		perf-$(CONFIG_LIBBPF) += bpf-loader.o
		perf-$(CONFIG_LIBBPF) += bpf_map.o

tools/perf/util/mutex.c

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		// SPDX-License-Identifier: GPL-2.0
		#include "mutex.h"

		#include "debug.h"
		#include <linux/string.h>
		#include <errno.h>

		static void check_err(const char *fn, int err)
		{
		char sbuf[STRERR_BUFSIZE];

		if (err == 0)
		return;

		pr_err("%s error: '%s'\n", fn, str_error_r(err, sbuf, sizeof(sbuf)));
		}

		#define CHECK_ERR(err) check_err(__func__, err)

		static void __mutex_init(struct mutex *mtx, bool pshared)
		{
		pthread_mutexattr_t attr;

		CHECK_ERR(pthread_mutexattr_init(&attr));

		#ifndef NDEBUG
		/* In normal builds enable error checking, such as recursive usage. */
		CHECK_ERR(pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK));
		#endif
		if (pshared)
		CHECK_ERR(pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED));

		CHECK_ERR(pthread_mutex_init(&mtx->lock, &attr));
		CHECK_ERR(pthread_mutexattr_destroy(&attr));
		}

		void mutex_init(struct mutex *mtx)
		{
		__mutex_init(mtx, /pshared=/false);
		}

		void mutex_init_pshared(struct mutex *mtx)
		{
		__mutex_init(mtx, /pshared=/true);
		}

		void mutex_destroy(struct mutex *mtx)
		{
		CHECK_ERR(pthread_mutex_destroy(&mtx->lock));
		}

		void mutex_lock(struct mutex *mtx)
		{
		CHECK_ERR(pthread_mutex_lock(&mtx->lock));
		}

		void mutex_unlock(struct mutex *mtx)
		{
		CHECK_ERR(pthread_mutex_unlock(&mtx->lock));
		}

		bool mutex_trylock(struct mutex *mtx)
		{
		int ret = pthread_mutex_trylock(&mtx->lock);

		if (ret == 0)
		return true; /* Lock acquired. */

		if (ret == EBUSY)
		return false; /* Lock busy. */

		/* Print error. */
		CHECK_ERR(ret);
		return false;
		}

		static void __cond_init(struct cond *cnd, bool pshared)
		{
		pthread_condattr_t attr;

		CHECK_ERR(pthread_condattr_init(&attr));
		if (pshared)
		CHECK_ERR(pthread_condattr_setpshared(&attr, PTHREAD_PROCESS_SHARED));

		CHECK_ERR(pthread_cond_init(&cnd->cond, &attr));
		CHECK_ERR(pthread_condattr_destroy(&attr));
		}

		void cond_init(struct cond *cnd)
		{
		__cond_init(cnd, /pshared=/false);
		}

		void cond_init_pshared(struct cond *cnd)
		{
		__cond_init(cnd, /pshared=/true);
		}

		void cond_destroy(struct cond *cnd)
		{
		CHECK_ERR(pthread_cond_destroy(&cnd->cond));
		}

		void cond_wait(struct cond cnd, struct mutex mtx)
		{
		CHECK_ERR(pthread_cond_wait(&cnd->cond, &mtx->lock));
		}

		void cond_signal(struct cond *cnd)
		{
		CHECK_ERR(pthread_cond_signal(&cnd->cond));
		}

		void cond_broadcast(struct cond *cnd)
		{
		CHECK_ERR(pthread_cond_broadcast(&cnd->cond));
		}

tools/perf/util/mutex.h

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		/* SPDX-License-Identifier: GPL-2.0 */
		#ifndef __PERF_MUTEX_H
		#define __PERF_MUTEX_H

		#include <pthread.h>
		#include <stdbool.h>

		/*
		* A wrapper around the mutex implementation that allows perf to error check
		* usage, etc.
		*/
		struct mutex {
		pthread_mutex_t lock;
		};

		/* A wrapper around the condition variable implementation. */
		struct cond {
		pthread_cond_t cond;
		};

		/* Default initialize the mtx struct. */
		void mutex_init(struct mutex *mtx);
		/*
		* Initialize the mtx struct and set the process-shared rather than default
		* process-private attribute.
		*/
		void mutex_init_pshared(struct mutex *mtx);
		void mutex_destroy(struct mutex *mtx);

		void mutex_lock(struct mutex *mtx);
		void mutex_unlock(struct mutex *mtx);
		/* Tries to acquire the lock and returns true on success. */
		bool mutex_trylock(struct mutex *mtx);

		/* Default initialize the cond struct. */
		void cond_init(struct cond *cnd);
		/*
		* Initialize the cond struct and specify the process-shared rather than default
		* process-private attribute.
		*/
		void cond_init_pshared(struct cond *cnd);
		void cond_destroy(struct cond *cnd);

		void cond_wait(struct cond cnd, struct mutex mtx);
		void cond_signal(struct cond *cnd);
		void cond_broadcast(struct cond *cnd);

		#endif /* __PERF_MUTEX_H */