--- /dev/null
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms
+ * of the Common Development and Distribution License
+ * (the "License"). You may not use this file except
+ * in compliance with the License.
+ *
+ * You can obtain a copy of the license at
+ * src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing
+ * permissions and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL
+ * HEADER in each file and include the License file at
+ * usr/src/OPENSOLARIS.LICENSE. If applicable,
+ * add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your
+ * own identifying information: Portions Copyright [yyyy]
+ * [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+
+/*
+ * The "cascade" test case is a multiprocess/multithread batten-passing model
+ * using lock primitives alone for synchronisation. Threads are arranged in a
+ * ring. Each thread has two locks of its own on which it blocks, and is able
+ * to manipulate the two locks belonging to the thread which follows it in the
+ * ring.
+ *
+ * The number of threads (nthreads) is specified by the generic libMicro -P/-T
+ * options. With nthreads == 1 (the default) the uncontended case can be timed.
+ *
+ * The main logic is generic and allows any simple blocking API to be tested.
+ * The API-specific component is clearly indicated.
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <pthread.h>
+#include <sys/mman.h>
+
+#include "libmicro.h"
+
+typedef struct {
+ int ts_once;
+ int ts_id;
+ int ts_us0; /* our lock indices */
+ int ts_us1;
+ int ts_them0; /* their lock indices */
+ int ts_them1;
+} tsd_t;
+
+static int nthreads;
+
+/*
+ * API-specific code BEGINS here
+ */
+
+static int opts = 0;
+static int nlocks;
+static pthread_mutex_t *locks;
+
+int
+benchmark_init()
+{
+ lm_tsdsize = sizeof (tsd_t);
+
+ (void) sprintf(lm_optstr, "s");
+
+ lm_defN = "cscd_mutex";
+
+ (void) sprintf(lm_usage,
+ " [-s] (force PTHREAD_PROCESS_SHARED)\n"
+ "notes: thread cascade using pthread_mutexes\n");
+
+ return (0);
+}
+
+/*ARGSUSED*/
+int
+benchmark_optswitch(int opt, char *optarg)
+{
+ switch (opt) {
+ case 's':
+ opts = 1;
+ break;
+ default:
+ return (-1);
+ }
+ return (0);
+}
+
+int
+benchmark_initrun()
+{
+ int i;
+ int e = 0;
+ pthread_mutexattr_t ma;
+
+ nthreads = lm_optP * lm_optT;
+ nlocks = nthreads * 2;
+ /*LINTED*/
+ locks = (pthread_mutex_t *)mmap(NULL,
+ nlocks * sizeof (pthread_mutex_t),
+ PROT_READ | PROT_WRITE,
+ MAP_ANON | MAP_SHARED,
+ -1, 0L);
+ if (locks == MAP_FAILED) {
+ return (1);
+ }
+
+ (void) pthread_mutexattr_init(&ma);
+ if (lm_optP > 1 || opts) {
+ (void) pthread_mutexattr_setpshared(&ma,
+ PTHREAD_PROCESS_SHARED);
+ } else {
+ (void) pthread_mutexattr_setpshared(&ma,
+ PTHREAD_PROCESS_PRIVATE);
+ }
+
+ for (i = 0; i < nlocks; i++) {
+ (void) pthread_mutex_init(&locks[i], &ma);
+ }
+
+ return (e);
+}
+
+int
+block(int index)
+{
+ return (pthread_mutex_lock(&locks[index]) == -1);
+}
+
+int
+unblock(int index)
+{
+ return (pthread_mutex_unlock(&locks[index]) == -1);
+}
+
+/*
+ * API-specific code ENDS here
+ */
+
+int
+benchmark_initbatch(void *tsd)
+{
+ tsd_t *ts = (tsd_t *)tsd;
+ int e = 0;
+
+ if (ts->ts_once == 0) {
+ int us, them;
+
+#if !defined(__APPLE__)
+ us = (getpindex() * lm_optT) + gettindex();
+#else
+ us = gettsdindex(tsd);
+#endif /* __APPLE__ */
+
+ them = (us + 1) % (lm_optP * lm_optT);
+
+ ts->ts_id = us;
+
+ /* lock index asignment for us and them */
+ ts->ts_us0 = (us * 2);
+ ts->ts_us1 = (us * 2) + 1;
+ if (us < nthreads - 1) {
+ /* straight-thru connection to them */
+ ts->ts_them0 = (them * 2);
+ ts->ts_them1 = (them * 2) + 1;
+ } else {
+ /* cross-over connection to them */
+ ts->ts_them0 = (them * 2) + 1;
+ ts->ts_them1 = (them * 2);
+ }
+
+ ts->ts_once = 1;
+ }
+
+ /* block their first move */
+ e += block(ts->ts_them0);
+
+ return (e);
+}
+
+int
+benchmark(void *tsd, result_t *res)
+{
+ tsd_t *ts = (tsd_t *)tsd;
+ int i;
+ int e = 0;
+
+ /* wait to be unblocked (id == 0 will not block) */
+ e += block(ts->ts_us0);
+
+ for (i = 0; i < lm_optB; i += 2) {
+ /* allow them to block us again */
+ e += unblock(ts->ts_us0);
+
+ /* block their next + 1 move */
+ e += block(ts->ts_them1);
+
+ /* unblock their next move */
+ e += unblock(ts->ts_them0);
+
+ /* wait for them to unblock us */
+ e += block(ts->ts_us1);
+
+ /* repeat with locks reversed */
+ e += unblock(ts->ts_us1);
+ e += block(ts->ts_them0);
+ e += unblock(ts->ts_them1);
+ e += block(ts->ts_us0);
+ }
+
+ /* finish batch with nothing blocked */
+ e += unblock(ts->ts_them0);
+ e += unblock(ts->ts_us0);
+
+ res->re_count = i;
+ res->re_errors = e;
+
+ return (0);
+}
projects / apple / xnu.git / blobdiff