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-/**
- * testcode/checklocks.h - wrapper on locks that checks access.
- *
- * Copyright (c) 2007, NLnet Labs. All rights reserved.
- * 
- * This software is open source.
- * 
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 
- * Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 
- * Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 
- * Neither the name of the NLNET LABS nor the names of its contributors may
- * be used to endorse or promote products derived from this software without
- * specific prior written permission.
- * 
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef TESTCODE_CHECK_LOCKS_H
-#define TESTCODE_CHECK_LOCKS_H
-
-/**
- * \file
- * Locks that are checked.
- *
- * Holds information per lock and per thread.
- * That information is protected by a mutex (unchecked).
- *
- * Checks:
- *      o which func, file, line created the lock.
- *      o contention count, measures amount of contention on the lock.
- *      o the memory region(s) that the lock protects are
- *        memcmp'ed to ascertain no race conditions.
- *      o checks that locks are unlocked properly (before deletion).
- *        keeps which func, file, line that locked it.
- *	o checks deadlocks with timeout so it can print errors for them.
- *
- * Limitations:
- *	o Detects unprotected memory access when the lock is locked or freed,
- *	  which detects races only if they happen, and only if in protected
- *	  memory areas.
- *	o Detects deadlocks by timeout, so approximately, as they happen.
- *	o Does not check order of locking.
- *	o Uses a lot of memory.
- *	o The checks use locks themselves, changing scheduling,
- *	  thus changing what races you see.
- */
-
-#ifdef USE_THREAD_DEBUG
-#ifndef HAVE_PTHREAD
-/* we need the *timed*lock() routines to use for deadlock detection. */
-#error "Need pthreads for checked locks"
-#endif
-/******************* THREAD DEBUG ************************/
-#include <pthread.h>
-
-/** How many threads to allocate for */
-#define THRDEBUG_MAX_THREADS 32 /* threads */
-/** do we check locking order */
-extern int check_locking_order;
-
-/**
- * Protection memory area.
- * It is copied to a holding buffer to compare against later.
- * Note that it may encompass the lock structure.
- */
-struct protected_area {
-	/** where the memory region starts */
-	void* region;
-	/** size of the region */
-	size_t size;
-	/** backbuffer that holds a copy, of same size. */
-	void* hold;
-	/** next protected area in list */
-	struct protected_area* next;
-};
-
-/**
- * Per thread information for locking debug wrappers. 
- */
-struct thr_check {
-	/** thread id */
-	pthread_t id;
-	/** real thread func */
-	void* (*func)(void*);
-	/** func user arg */
-	void* arg;
-	/** number of thread in list structure */
-	int num;
-	/** instance number - how many locks have been created by thread */
-	int locks_created;
-	/** file to write locking order information to */
-	FILE* order_info;
-	/** 
-	 * List of locks that this thread is holding, double
-	 * linked list. The first element is the most recent lock acquired.
-	 * So it represents the stack of locks acquired. (of all types).
-	 */
-	struct checked_lock *holding_first, *holding_last;
-	/** if the thread is currently waiting for a lock, which one */
-	struct checked_lock* waiting;
-};
-
-/**
- * One structure for all types of locks.
- */
-struct checked_lock {
-	/** mutex for exclusive access to this structure */
-	pthread_mutex_t lock;
-	/** list of memory regions protected by this checked lock */
-	struct protected_area* prot;
-	/** where was this lock created */
-	const char* create_func, *create_file;
-	/** where was this lock created */
-	int create_line;
-	/** unique instance identifier */
-	int create_thread, create_instance;
-	/** contention count */
-	size_t contention_count;
-	/** number of times locked, ever */
-	size_t history_count;
-	/** hold count (how many threads are holding this lock) */
-	int hold_count;
-	/** how many threads are waiting for this lock */
-	int wait_count;
-	/** who touched it last */
-	const char* holder_func, *holder_file;
-	/** who touched it last */
-	int holder_line;
-	/** who owns the lock now */
-	struct thr_check* holder;
-	/** for rwlocks, the writelock holder */
-	struct thr_check* writeholder;
-
-	/** next lock a thread is holding (less recent) */
-	struct checked_lock* next_held_lock[THRDEBUG_MAX_THREADS];
-	/** prev lock a thread is holding (more recent) */
-	struct checked_lock* prev_held_lock[THRDEBUG_MAX_THREADS];
-
-	/** type of lock */
-	enum check_lock_type {
-		/** basic mutex */
-		check_lock_mutex,
-		/** fast spinlock */
-		check_lock_spinlock,
-		/** rwlock */
-		check_lock_rwlock
-	} type;
-	/** the lock itself, see type to disambiguate the union */
-	union {
-		/** mutex */
-		pthread_mutex_t mutex;
-		/** spinlock */
-		pthread_spinlock_t spinlock;
-		/** rwlock */
-		pthread_rwlock_t rwlock;
-	} u;
-};
-
-/**
- * Additional call for the user to specify what areas are protected
- * @param lock: the lock that protects the area. It can be inside the area.
- *	The lock must be inited. Call with user lock. (any type).
- *	It demangles the lock itself (struct checked_lock**).
- * @param area: ptr to mem.
- * @param size: length of area.
- * You can call it multiple times with the same lock to give several areas.
- * Call it when you are done initialising the area, since it will be copied
- * at this time and protected right away against unauthorised changes until 
- * the next lock() call is done.
- */
-void lock_protect(void* lock, void* area, size_t size);
-
-/**
- * Remove protected area from lock.
- * No need to call this when deleting the lock.
- * @param lock: the lock, any type, (struct checked_lock**).
- * @param area: pointer to memory.
- */
-void lock_unprotect(void* lock, void* area);
-
-/**
- * Get memory associated with a checked lock
- * @param lock: the checked lock, any type. (struct checked_lock**).
- * @return: in bytes, including protected areas.
- */
-size_t lock_get_mem(void* lock);
-
-/**
- * Initialise checklock. Sets up internal debug structures.
- */
-void checklock_start(void);
-
-/**
- * Cleanup internal debug state.
- */
-void checklock_stop(void);
-
-/**
- * Init locks.
- * @param type: what type of lock this is.
- * @param lock: ptr to user alloced ptr structure. This is inited.
- *     So an alloc is done and the ptr is stored as result.
- * @param func: caller function name.
- * @param file: caller file name.
- * @param line: caller line number.
- */
-void checklock_init(enum check_lock_type type, struct checked_lock** lock,
-	const char* func, const char* file, int line);
-
-/**
- * Destroy locks. Free the structure.
- * @param type: what type of lock this is.
- * @param lock: ptr to user alloced structure. This is destroyed.
- * @param func: caller function name.
- * @param file: caller file name.
- * @param line: caller line number.
- */
-void checklock_destroy(enum check_lock_type type, struct checked_lock** lock,
-	const char* func, const char* file, int line);
-
-/**
- * Acquire readlock.
- * @param type: what type of lock this is. Had better be a rwlock.
- * @param lock: ptr to lock.
- * @param func: caller function name.
- * @param file: caller file name.
- * @param line: caller line number.
- */
-void checklock_rdlock(enum check_lock_type type, struct checked_lock* lock,
-	const char* func, const char* file, int line);
-
-/**
- * Acquire writelock.
- * @param type: what type of lock this is. Had better be a rwlock.
- * @param lock: ptr to lock.
- * @param func: caller function name.
- * @param file: caller file name.
- * @param line: caller line number.
- */
-void checklock_wrlock(enum check_lock_type type, struct checked_lock* lock,
-	const char* func, const char* file, int line);
-
-/**
- * Locks.
- * @param type: what type of lock this is. Had better be mutex or spinlock.
- * @param lock: the lock.
- * @param func: caller function name.
- * @param file: caller file name.
- * @param line: caller line number.
- */
-void checklock_lock(enum check_lock_type type, struct checked_lock* lock,
-	const char* func, const char* file, int line);
-
-/**
- * Unlocks.
- * @param type: what type of lock this is.
- * @param lock: the lock.
- * @param func: caller function name.
- * @param file: caller file name.
- * @param line: caller line number.
- */
-void checklock_unlock(enum check_lock_type type, struct checked_lock* lock,
-	const char* func, const char* file, int line);
-
-/**
- * Create thread.
- * @param thr: Thread id, where to store result.
- * @param func: thread start function.
- * @param arg: user argument.
- */
-void checklock_thrcreate(pthread_t* thr, void* (*func)(void*), void* arg);
-
-/**
- * Wait for thread to exit. Returns thread return value.
- * @param thread: thread to wait for.
- */
-void checklock_thrjoin(pthread_t thread);
-
-/** structures to enable compiler type checking on the locks. 
- * Also the pointer makes it so that the lock can be part of the protected
- * region without any possible problem (since the ptr will stay the same.)
- * i.e. there can be contention and readlocks stored in checked_lock, while
- * the protected area stays the same, even though it contains (ptr to) lock.
- */
-struct checked_lock_rw { struct checked_lock* c_rw; };
-/** structures to enable compiler type checking on the locks. */
-struct checked_lock_mutex { struct checked_lock* c_m; };
-/** structures to enable compiler type checking on the locks. */
-struct checked_lock_spl { struct checked_lock* c_spl; };
-
-/** debugging rwlock */
-typedef struct checked_lock_rw lock_rw_type;
-#define lock_rw_init(lock) checklock_init(check_lock_rwlock, &((lock)->c_rw), __func__, __FILE__, __LINE__)
-#define lock_rw_destroy(lock) checklock_destroy(check_lock_rwlock, &((lock)->c_rw), __func__, __FILE__, __LINE__)
-#define lock_rw_rdlock(lock) checklock_rdlock(check_lock_rwlock, (lock)->c_rw, __func__, __FILE__, __LINE__)
-#define lock_rw_wrlock(lock) checklock_wrlock(check_lock_rwlock, (lock)->c_rw, __func__, __FILE__, __LINE__)
-#define lock_rw_unlock(lock) checklock_unlock(check_lock_rwlock, (lock)->c_rw, __func__, __FILE__, __LINE__)
-
-/** debugging mutex */
-typedef struct checked_lock_mutex lock_basic_type;
-#define lock_basic_init(lock) checklock_init(check_lock_mutex, &((lock)->c_m), __func__, __FILE__, __LINE__)
-#define lock_basic_destroy(lock) checklock_destroy(check_lock_mutex, &((lock)->c_m), __func__, __FILE__, __LINE__)
-#define lock_basic_lock(lock) checklock_lock(check_lock_mutex, (lock)->c_m, __func__, __FILE__, __LINE__)
-#define lock_basic_unlock(lock) checklock_unlock(check_lock_mutex, (lock)->c_m, __func__, __FILE__, __LINE__)
-
-/** debugging spinlock */
-typedef struct checked_lock_spl lock_quick_type;
-#define lock_quick_init(lock) checklock_init(check_lock_spinlock, &((lock)->c_spl), __func__, __FILE__, __LINE__)
-#define lock_quick_destroy(lock) checklock_destroy(check_lock_spinlock, &((lock)->c_spl), __func__, __FILE__, __LINE__)
-#define lock_quick_lock(lock) checklock_lock(check_lock_spinlock, (lock)->c_spl, __func__, __FILE__, __LINE__)
-#define lock_quick_unlock(lock) checklock_unlock(check_lock_spinlock, (lock)->c_spl, __func__, __FILE__, __LINE__)
-
-/** we use the pthread id, our thr_check structure is kept behind the scenes */
-typedef pthread_t ub_thread_type;
-#define ub_thread_create(thr, func, arg) checklock_thrcreate(thr, func, arg)
-#define ub_thread_self() pthread_self()
-#define ub_thread_join(thread) checklock_thrjoin(thread)
-
-typedef pthread_key_t ub_thread_key_type;
-#define ub_thread_key_create(key, f) LOCKRET(pthread_key_create(key, f))
-#define ub_thread_key_set(key, v) LOCKRET(pthread_setspecific(key, v))
-#define ub_thread_key_get(key) pthread_getspecific(key)
-
-#endif /* USE_THREAD_DEBUG */
-#endif /* TESTCODE_CHECK_LOCKS_H */