/************************************************************************* * Copyright (C) 2010-2014 Tavian Barnes * * * * This file is part of The Dimension Library. * * * * The Dimension Library is free software; you can redistribute it and/ * * or modify it under the terms of the GNU Lesser General Public License * * as published by the Free Software Foundation; either version 3 of the * * License, or (at your option) any later version. * * * * The Dimension Library is distributed in the hope that it will be * * useful, but WITHOUT ANY WARRANTY; without even the implied warranty * * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * * Lesser General Public License for more details. * * * * You should have received a copy of the GNU Lesser General Public * * License along with this program. If not, see * * . * *************************************************************************/ /** * @file * Background threading interface. */ #include /** * Thread callback type. * @param[in,out] ptr An arbitrary pointer. * @return 0 on success, non-zero on failure. */ typedef int dmnsn_thread_fn(void *ptr); /** * Create a thread that cleans up after itself on errors. * @param[in,out] future The future object to associate with the thread. * @param[in] thread_fn The thread callback. * @param[in,out] arg The pointer to pass to the thread callback. */ DMNSN_INTERNAL void dmnsn_new_thread(dmnsn_future *future, dmnsn_thread_fn *thread_fn, void *arg); /** * Thread callback type for parallel tasks. * @param[in,out] ptr An arbitrary pointer. * @param[in] thread An ID for this thread, in [0, \p nthreads). * @param[in] nthreads The number of concurrent threads. * @return 0 on success, non-zero on failure. */ typedef int dmnsn_ccthread_fn(void *ptr, unsigned int thread, unsigned int nthreads); /** * Run \p nthreads threads in parallel. * @param[in] ccthread_fn The routine to run in each concurrent thread. * @param[in,out] arg The pointer to pass to the thread callbacks. * @param[in] nthreads The number of concurrent threads to run. * @return 0 if all threads were successful, and an error code otherwise. */ DMNSN_INTERNAL int dmnsn_execute_concurrently(dmnsn_ccthread_fn *ccthread_fn, void *arg, unsigned int nthreads); /** * Initialize a mutex, bailing out on failure. * @param[out] mutex The mutex to initialize. */ DMNSN_INTERNAL void dmnsn_initialize_mutex(pthread_mutex_t *mutex); /** dmnsn_lock_mutex() implementation. */ DMNSN_INTERNAL void dmnsn_lock_mutex_impl(pthread_mutex_t *mutex); /** dmnsn_unlock_mutex() implementation. */ DMNSN_INTERNAL void dmnsn_unlock_mutex_impl(pthread_mutex_t *mutex); /** * Lock a mutex, bailing out on failure. * Contains a {, so must be used in the same block as dmnsn_unlock_mutex(). * @param[in,out] mutex The mutex to lock. */ #define dmnsn_lock_mutex(mutex) dmnsn_lock_mutex_impl((mutex)); { /** * Unlock a mutex, bailing out on failure. * Contains a }, so must be used in the same block as dmnsn_lock_mutex(). * @param[in,out] mutex The mutex to unlock. */ #define dmnsn_unlock_mutex(mutex) dmnsn_unlock_mutex_impl((mutex)); } /** * Destroy a mutex, warning on failure. * @param[in,out] mutex The mutex to destroy. */ DMNSN_INTERNAL void dmnsn_destroy_mutex(pthread_mutex_t *mutex); /** * Initialize a read-write lock, bailing out on failure. * @param[out] rwlock The read-write lock to initialize. */ DMNSN_INTERNAL void dmnsn_initialize_rwlock(pthread_rwlock_t *rwlock); /** dmnsn_read_lock() implementation. */ DMNSN_INTERNAL void dmnsn_read_lock_impl(pthread_rwlock_t *rwlock); /** dmnsn_write_lock() implementation. */ DMNSN_INTERNAL void dmnsn_write_lock_impl(pthread_rwlock_t *rwlock); /** dmnsn_unlock_rwlock() implementation. */ DMNSN_INTERNAL void dmnsn_unlock_rwlock_impl(pthread_rwlock_t *rwlock); /** * Read-lock a read-write lock, bailing out on failure. * Contains a {, so must be used in the same block as dmnsn_unlock_rwlock(). * @param[in,out] rwlock The read-write lock to lock. */ #define dmnsn_read_lock(rwlock) dmnsn_read_lock_impl((rwlock)); { /** * Write-lock a read-write lock, bailing out on failure. * Contains a {, so must be used in the same block as dmnsn_unlock_rwlock(). * @param[in,out] rwlock The read-write lock to lock. */ #define dmnsn_write_lock(rwlock) dmnsn_write_lock_impl((rwlock)); { /** * Unlock a read-write lock, bailing out on failure. * Contains a }, so must be used in the same block as dmnsn_read_lock() or * dmnsn_write_lock(). * @param[in,out] rwlock The read-write lock to lock. */ #define dmnsn_unlock_rwlock(rwlock) dmnsn_unlock_rwlock_impl((rwlock)); } /** * Destroy a read-write lock, warning on failure. * @param[in,out] rwlock The read-write lock to destroy. */ DMNSN_INTERNAL void dmnsn_destroy_rwlock(pthread_rwlock_t *rwlock); /** * Initialize a condition variable, bailing out on failure. * @param[out] cond The condition variable to initialize. */ DMNSN_INTERNAL void dmnsn_initialize_cond(pthread_cond_t *cond); /** * Wait on a condition variable, bailing out on error. * @param[in] cond The condition variable to wait on. * @param[in] mutex The associated mutex. */ DMNSN_INTERNAL void dmnsn_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex); /** * Signal a condition variable, bailing out on error. * @param[in] cond The condition variable to signal. */ DMNSN_INTERNAL void dmnsn_cond_broadcast(pthread_cond_t *cond); /** * Destroy a condition variable, warning on failure. * @param[in,out] cond The condition variable to destroy. */ DMNSN_INTERNAL void dmnsn_destroy_cond(pthread_cond_t *cond); /** * Once-called callback type. */ typedef void dmnsn_once_fn(void); /** * Call a function exactly once, bailing out on failure. * @param[in,out] once The once control. * @param[in] once_fn The function to call. */ DMNSN_INTERNAL void dmnsn_once(pthread_once_t *once, dmnsn_once_fn *once_fn); /** * Initialize a thread-local storage key, bailing out on failure. * @param[out] key The key to initialize. * @param[in] destructor An optional destructor callback. */ DMNSN_INTERNAL void dmnsn_key_create(pthread_key_t *key, dmnsn_callback_fn *destructor); /** * Set a thread-specific pointer, bailing out on failure. * @param[in] key The thread-local storage key. * @param[in] value The value to set. */ DMNSN_INTERNAL void dmnsn_setspecific(pthread_key_t key, const void *value); /** * Destroy a thread-local storage key, warning on failure. * @param[out] key The key to destroy. */ DMNSN_INTERNAL void dmnsn_key_delete(pthread_key_t key); /** * Join a thread, bailing out on failure. * @param[in,out] thread The thread to join. */ DMNSN_INTERNAL void dmnsn_join_thread(pthread_t thread, void **retval);