diff options
Diffstat (limited to 'lib/libpthread/tests/p_bench_mutex.c')
-rw-r--r-- | lib/libpthread/tests/p_bench_mutex.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/lib/libpthread/tests/p_bench_mutex.c b/lib/libpthread/tests/p_bench_mutex.c new file mode 100644 index 00000000000..e3179f08072 --- /dev/null +++ b/lib/libpthread/tests/p_bench_mutex.c @@ -0,0 +1,78 @@ +/* ==== p_bench_mutex.c ================================================= + * Copyright (c) 1993 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("getopt [-d?] [-c count]\n"); + errno = 0; +} + +main(int argc, char **argv) +{ + struct timeval starttime, endtime; + pthread_mutex_t lock; + int count = 1000000; + int debug = 0; + int i; + + char word[256]; + + /* Getopt variables. */ + extern int optind, opterr; + extern char *optarg; + + pthread_init(); + + while ((word[0] = getopt(argc, argv, "c:d?")) != (char)EOF) { + switch (word[0]) { + case 'd': + debug++; + break; + case 'c': + count = atoi(optarg); + break; + case '?': + usage(); + return(OK); + default: + usage(); + return(NOTOK); + } + } + + pthread_mutex_init(&lock, NULL); + if (gettimeofday(&starttime, NULL)) { + perror ("gettimeofday"); + return 1; + } + for (i = 0; i < count; i++) { + pthread_mutex_lock(&lock); + pthread_mutex_unlock(&lock); + } + if (gettimeofday(&endtime, NULL)) { + perror ("gettimeofday"); + return 1; + } + + printf("%d mutex locks/unlocks no contention took %d usecs.\n", count, + (endtime.tv_sec - starttime.tv_sec) * 1000000 + + (endtime.tv_usec - starttime.tv_usec)); + + return 0; +} |