Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
John Stultz | 712 | 99.03% | 2 | 40.00% |
Kees Cook | 5 | 0.70% | 1 | 20.00% |
Ingo Molnar | 1 | 0.14% | 1 | 20.00% |
Nathan Chancellor | 1 | 0.14% | 1 | 20.00% |
Total | 719 | 5 |
/* threadtest.c * by: john stultz (johnstul@us.ibm.com) * (C) Copyright IBM 2004, 2005, 2006, 2012 * Licensed under the GPLv2 * * To build: * $ gcc threadtest.c -o threadtest -lrt * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 2 of the License, or * (at your option) any later version. * * This program 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 General Public License for more details. */ #include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <sys/time.h> #include <pthread.h> #include "../kselftest.h" /* serializes shared list access */ pthread_mutex_t list_lock = PTHREAD_MUTEX_INITIALIZER; /* serializes console output */ pthread_mutex_t print_lock = PTHREAD_MUTEX_INITIALIZER; #define MAX_THREADS 128 #define LISTSIZE 128 int done = 0; struct timespec global_list[LISTSIZE]; int listcount = 0; void checklist(struct timespec *list, int size) { int i, j; struct timespec *a, *b; /* scan the list */ for (i = 0; i < size-1; i++) { a = &list[i]; b = &list[i+1]; /* look for any time inconsistencies */ if ((b->tv_sec <= a->tv_sec) && (b->tv_nsec < a->tv_nsec)) { /* flag other threads */ done = 1; /*serialize printing to avoid junky output*/ pthread_mutex_lock(&print_lock); /* dump the list */ printf("\n"); for (j = 0; j < size; j++) { if (j == i) printf("---------------\n"); printf("%lu:%lu\n", list[j].tv_sec, list[j].tv_nsec); if (j == i+1) printf("---------------\n"); } printf("[FAILED]\n"); pthread_mutex_unlock(&print_lock); } } } /* The shared thread shares a global list * that each thread fills while holding the lock. * This stresses clock synchronization across cpus. */ void *shared_thread(void *arg) { while (!done) { /* protect the list */ pthread_mutex_lock(&list_lock); /* see if we're ready to check the list */ if (listcount >= LISTSIZE) { checklist(global_list, LISTSIZE); listcount = 0; } clock_gettime(CLOCK_MONOTONIC, &global_list[listcount++]); pthread_mutex_unlock(&list_lock); } return NULL; } /* Each independent thread fills in its own * list. This stresses clock_gettime() lock contention. */ void *independent_thread(void *arg) { struct timespec my_list[LISTSIZE]; int count; while (!done) { /* fill the list */ for (count = 0; count < LISTSIZE; count++) clock_gettime(CLOCK_MONOTONIC, &my_list[count]); checklist(my_list, LISTSIZE); } return NULL; } #define DEFAULT_THREAD_COUNT 8 #define DEFAULT_RUNTIME 30 int main(int argc, char **argv) { int thread_count, i; time_t start, now, runtime; char buf[255]; pthread_t pth[MAX_THREADS]; int opt; void *tret; int ret = 0; void *(*thread)(void *) = shared_thread; thread_count = DEFAULT_THREAD_COUNT; runtime = DEFAULT_RUNTIME; /* Process arguments */ while ((opt = getopt(argc, argv, "t:n:i")) != -1) { switch (opt) { case 't': runtime = atoi(optarg); break; case 'n': thread_count = atoi(optarg); break; case 'i': thread = independent_thread; printf("using independent threads\n"); break; default: printf("Usage: %s [-t <secs>] [-n <numthreads>] [-i]\n", argv[0]); printf(" -t: time to run\n"); printf(" -n: number of threads\n"); printf(" -i: use independent threads\n"); return -1; } } if (thread_count > MAX_THREADS) thread_count = MAX_THREADS; setbuf(stdout, NULL); start = time(0); strftime(buf, 255, "%a, %d %b %Y %T %z", localtime(&start)); printf("%s\n", buf); printf("Testing consistency with %i threads for %ld seconds: ", thread_count, runtime); fflush(stdout); /* spawn */ for (i = 0; i < thread_count; i++) pthread_create(&pth[i], 0, thread, 0); while (time(&now) < start + runtime) { sleep(1); if (done) { ret = 1; strftime(buf, 255, "%a, %d %b %Y %T %z", localtime(&now)); printf("%s\n", buf); goto out; } } printf("[OK]\n"); done = 1; out: /* wait */ for (i = 0; i < thread_count; i++) pthread_join(pth[i], &tret); /* die */ if (ret) ksft_exit_fail(); ksft_exit_pass(); }
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