109 lines
3.5 KiB
C
109 lines
3.5 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __PERF_MUTEX_H
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#define __PERF_MUTEX_H
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#include <pthread.h>
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#include <stdbool.h>
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/*
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* A function-like feature checking macro that is a wrapper around
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* `__has_attribute`, which is defined by GCC 5+ and Clang and evaluates to a
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* nonzero constant integer if the attribute is supported or 0 if not.
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*/
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#ifdef __has_attribute
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#define HAVE_ATTRIBUTE(x) __has_attribute(x)
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#else
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#define HAVE_ATTRIBUTE(x) 0
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#endif
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#if HAVE_ATTRIBUTE(guarded_by) && HAVE_ATTRIBUTE(pt_guarded_by) && \
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HAVE_ATTRIBUTE(lockable) && HAVE_ATTRIBUTE(exclusive_lock_function) && \
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HAVE_ATTRIBUTE(exclusive_trylock_function) && HAVE_ATTRIBUTE(exclusive_locks_required) && \
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HAVE_ATTRIBUTE(no_thread_safety_analysis)
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/* Documents if a shared field or global variable needs to be protected by a mutex. */
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#define GUARDED_BY(x) __attribute__((guarded_by(x)))
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/*
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* Documents if the memory location pointed to by a pointer should be guarded by
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* a mutex when dereferencing the pointer.
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*/
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#define PT_GUARDED_BY(x) __attribute__((pt_guarded_by(x)))
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/* Documents if a type is a lockable type. */
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#define LOCKABLE __attribute__((lockable))
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/* Documents functions that acquire a lock in the body of a function, and do not release it. */
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#define EXCLUSIVE_LOCK_FUNCTION(...) __attribute__((exclusive_lock_function(__VA_ARGS__)))
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/*
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* Documents functions that expect a lock to be held on entry to the function,
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* and release it in the body of the function.
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*/
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#define UNLOCK_FUNCTION(...) __attribute__((unlock_function(__VA_ARGS__)))
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/* Documents functions that try to acquire a lock, and return success or failure. */
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#define EXCLUSIVE_TRYLOCK_FUNCTION(...) \
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__attribute__((exclusive_trylock_function(__VA_ARGS__)))
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/* Documents a function that expects a mutex to be held prior to entry. */
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#define EXCLUSIVE_LOCKS_REQUIRED(...) __attribute__((exclusive_locks_required(__VA_ARGS__)))
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/* Turns off thread safety checking within the body of a particular function. */
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#define NO_THREAD_SAFETY_ANALYSIS __attribute__((no_thread_safety_analysis))
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#else
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#define GUARDED_BY(x)
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#define PT_GUARDED_BY(x)
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#define LOCKABLE
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#define EXCLUSIVE_LOCK_FUNCTION(...)
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#define UNLOCK_FUNCTION(...)
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#define EXCLUSIVE_TRYLOCK_FUNCTION(...)
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#define EXCLUSIVE_LOCKS_REQUIRED(...)
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#define NO_THREAD_SAFETY_ANALYSIS
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#endif
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/*
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* A wrapper around the mutex implementation that allows perf to error check
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* usage, etc.
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*/
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struct LOCKABLE mutex {
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pthread_mutex_t lock;
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};
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/* A wrapper around the condition variable implementation. */
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struct cond {
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pthread_cond_t cond;
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};
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/* Default initialize the mtx struct. */
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void mutex_init(struct mutex *mtx);
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/*
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* Initialize the mtx struct and set the process-shared rather than default
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* process-private attribute.
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*/
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void mutex_init_pshared(struct mutex *mtx);
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void mutex_destroy(struct mutex *mtx);
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void mutex_lock(struct mutex *mtx) EXCLUSIVE_LOCK_FUNCTION(*mtx);
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void mutex_unlock(struct mutex *mtx) UNLOCK_FUNCTION(*mtx);
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/* Tries to acquire the lock and returns true on success. */
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bool mutex_trylock(struct mutex *mtx) EXCLUSIVE_TRYLOCK_FUNCTION(true, *mtx);
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/* Default initialize the cond struct. */
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void cond_init(struct cond *cnd);
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/*
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* Initialize the cond struct and specify the process-shared rather than default
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* process-private attribute.
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*/
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void cond_init_pshared(struct cond *cnd);
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void cond_destroy(struct cond *cnd);
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void cond_wait(struct cond *cnd, struct mutex *mtx) EXCLUSIVE_LOCKS_REQUIRED(mtx);
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void cond_signal(struct cond *cnd);
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void cond_broadcast(struct cond *cnd);
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#endif /* __PERF_MUTEX_H */
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