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