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106 lines
3.1 KiB
C
106 lines
3.1 KiB
C
/* -*- mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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// vim: expandtab:ts=8:sw=4:softtabstop=4:
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#ifndef _TOKU_WORKSET_H
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#define _TOKU_WORKSET_H
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#ident "$Id$"
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#ident "Copyright (c) 2007-2010 Tokutek Inc. All rights reserved."
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#ident "The technology is licensed by the Massachusetts Institute of Technology, Rutgers State University of New Jersey, and the Research Foundation of State University of New York at Stony Brook under United States of America Serial No. 11/760379 and to the patents and/or patent applications resulting from it."
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#include <toku_list.h>
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#include <toku_pthread.h>
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// The work struct is the base class for work to be done by some threads
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struct work {
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struct toku_list next;
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};
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// The workset struct contains the set of work to be done by some threads
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struct workset {
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toku_mutex_t lock;
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struct toku_list worklist; // a list of work
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int refs; // number of workers that have a reference on the workset
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toku_cond_t worker_wait; // a condition variable used to wait for all of the worker to release their reference on the workset
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};
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static inline void
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workset_init(struct workset *ws) {
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toku_mutex_init(&ws->lock, NULL);
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toku_list_init(&ws->worklist);
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ws->refs = 1; // the calling thread gets a reference
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toku_cond_init(&ws->worker_wait, NULL);
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}
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static inline void
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workset_destroy(struct workset *ws) {
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invariant(toku_list_empty(&ws->worklist));
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toku_cond_destroy(&ws->worker_wait);
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toku_mutex_destroy(&ws->lock);
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}
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static inline void
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workset_lock(struct workset *ws) {
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toku_mutex_lock(&ws->lock);
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}
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static inline void
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workset_unlock(struct workset *ws) {
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toku_mutex_unlock(&ws->lock);
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}
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// Put work in the workset. Assume the workset is already locked.
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static inline void
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workset_put_locked(struct workset *ws, struct work *w) {
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toku_list_push(&ws->worklist, &w->next);
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}
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// Put work in the workset
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static inline void
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workset_put(struct workset *ws, struct work *w) {
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workset_lock(ws);
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workset_put_locked(ws, w);
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workset_unlock(ws);
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}
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// Get work from the workset
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static inline struct work *
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workset_get(struct workset *ws) {
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workset_lock(ws);
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struct work *w = NULL;
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if (!toku_list_empty(&ws->worklist)) {
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struct toku_list *l = toku_list_pop_head(&ws->worklist);
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w = toku_list_struct(l, struct work, next);
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}
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workset_unlock(ws);
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return w;
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}
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// Add references to the workset
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static inline void
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workset_add_ref(struct workset *ws, int refs) {
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workset_lock(ws);
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ws->refs += refs;
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workset_unlock(ws);
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}
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// Release a reference on the workset
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static inline void
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workset_release_ref(struct workset *ws) {
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workset_lock(ws);
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if (--ws->refs == 0) {
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toku_cond_broadcast(&ws->worker_wait);
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}
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workset_unlock(ws);
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}
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// Wait until all of the worker threads have released their reference on the workset
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static inline void
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workset_join(struct workset *ws) {
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workset_lock(ws);
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while (ws->refs != 0) {
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toku_cond_wait(&ws->worker_wait, &ws->lock);
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}
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workset_unlock(ws);
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}
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#endif
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