1 files changed, 123 insertions, 0 deletions
diff --git a/mit-pthreads/tests/p_bench_yield.c b/mit-pthreads/tests/p_bench_yield.c
new file mode 100644
index 00000000000..bb6d86be09e
--- /dev/null
+++ b/mit-pthreads/tests/p_bench_yield.c
@@ -0,0 +1,123 @@
+/* ==== p_bench_mutex.c =================================================
+ * Copyright (c) 1993-1995 by Chris Provenzano, proven@athena.mit.edu
+ *
+ * Description : Benchmark mutex lock and unlock times
+ *
+ *  1.00 93/11/08 proven
+ *      -Started coding this file.
+ */
+
+#include <errno.h>
+#include <pthread.h>
+#include <stdio.h>
+
+#define	OK		0
+#define	NOTOK  -1
+
+/* ==========================================================================
+ * usage();
+ */
+void usage(void)
+{
+	printf("p_bench_yield [-d?] \\\n");
+	printf("\t[-c count] \\\n");
+	printf("\t[-C thread count] \\\n");
+	printf("\t[-O optimization level]\n");
+    errno = 0;
+}
+
+void *yield(void * arg)
+{
+	int i, * count;
+
+	count = (int *)arg;
+	for (i = 0; i < *count; i++) {
+		pthread_yield();
+	}
+	return(NULL);
+}
+
+main(int argc, char **argv)
+{
+	struct timeval starttime, endtime;
+	pthread_mutex_t lock;
+	pthread_attr_t attr;
+	pthread_t thread_id;
+	int thread_count = 1;
+	int optimization = 0;
+	int count = 1000000;
+	int i, debug = 0;
+
+	char word[256];
+
+    /* Getopt variables. */
+    extern int optind, opterr;
+    extern char *optarg;
+
+	pthread_init();
+
+	while ((word[0] = getopt(argc, argv, "C:O:c:d?")) != (char)EOF) {
+		switch (word[0]) {
+		case 'C':
+			thread_count = atoi(optarg);
+			break;
+		case 'O':
+			optimization = atoi(optarg);
+			break;
+		case 'c':
+			count = atoi(optarg);
+			break;
+		case 'd':
+			debug++;
+			break;
+		case '?':
+			usage();
+			return(OK);
+		default:
+			usage();
+			return(NOTOK);
+		}
+	}
+
+	pthread_attr_init(&attr);
+    if (optimization > 0) {
+		pthread_attr_setschedpolicy(&attr, SCHED_FIFO);
+	}
+    if (optimization > 1) {
+		pthread_attr_setfloatstate(&attr, PTHREAD_NOFLOAT);
+	}
+
+	pthread_mutex_init(&lock, NULL);
+	if (gettimeofday(&starttime, NULL)) {
+		perror ("gettimeofday");
+		return 1;
+	}
+	for (i = 1; i < thread_count; i++) {
+		if (pthread_create(&thread_id, &attr, yield, &count)) {
+			perror ("pthread_create");
+			return 1;
+		}
+		if (pthread_detach(thread_id)) {
+			perror ("pthread_detach");
+			return 1;
+		}
+	}
+	if (pthread_create(&thread_id, &attr, yield, &count)) {
+		perror ("pthread_create");
+		return 1;
+	}
+	if (pthread_join(thread_id, NULL)) {
+		perror ("pthread_join");
+		return 1;
+	}
+	if (gettimeofday(&endtime, NULL)) {
+		perror ("gettimeofday");
+		return 1;
+	}
+
+	printf("%d pthread_yields took %d usecs.\n", count, 
+		(endtime.tv_sec - starttime.tv_sec) * 1000000 +
+		(endtime.tv_usec - starttime.tv_usec));
+
+	return 0;
+}