tdb: delete from CCAN.

[ccan] / ccan / tdb / tools / starvation.c

diff --git a/ccan/tdb/tools/starvation.c b/ccan/tdb/tools/starvation.c
deleted file mode 100644 (file)
index 1baeab6..0000000
--- a/ccan/tdb/tools/starvation.c
+++ /dev/null
@@ -1,142 +0,0 @@
-/* Demonstrate starvation of tdb_lockall */
-#include <ccan/tdb/tdb.h>
-#include <err.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <time.h>
-#include <stdlib.h>
-#include <stdbool.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <string.h>
-#include <sys/time.h>
-
-static void usage(const char *extra)
-{
-       errx(1, "%s%s"
-            "Usage: starvation [lockall|gradual] <num> <worktime-in-ms>\n"
-            "  Each locker holds lock for between 1/2 and 1 1/2 times\n"
-            "  worktime, then sleeps for one second.\n\n"
-            "  Main process tries tdb_lockall or tdb_lockall_gradual.",
-            extra ? extra : "", extra ? "\n" : "");
-}
-
-static void run_and_sleep(struct tdb_context *tdb, int parentfd, unsigned time)
-{
-       char c;
-       struct timespec hold;
-       unsigned rand, randtime;
-       TDB_DATA key;
-
-       key.dptr = (void *)&rand;
-       key.dsize = sizeof(rand);
-
-       while (read(parentfd, &c, 1) != 0) {
-               /* Lock a random key. */
-               rand = random();
-               if (tdb_chainlock(tdb, key) != 0)
-                       errx(1, "chainlock failed: %s", tdb_errorstr(tdb));
-
-               /* Hold it for some variable time. */
-               randtime = time / 2 + (random() % time);
-               hold.tv_sec = randtime / 1000;
-               hold.tv_nsec = (randtime % 1000) * 1000000;
-               nanosleep(&hold, NULL);
-
-               if (tdb_chainunlock(tdb, key) != 0)
-                       errx(1, "chainunlock failed: %s", tdb_errorstr(tdb));
-
-               /* Wait for a second without the lock. */
-               sleep(1);
-       }
-       exit(0);
-}
-
-static void logfn(struct tdb_context *tdb,
-                 enum tdb_debug_level level,
-                 const char *fmt, ...)
-{
-           va_list ap;
-
-           va_start(ap, fmt);
-          vfprintf(stderr, fmt, ap);
-          va_end(ap);
-}
-
-int main(int argc, char *argv[])
-{
-       int (*lockall)(struct tdb_context *);
-       unsigned int num, worktime, i;
-       int pfd[2];
-       struct tdb_context *tdb;
-       struct tdb_logging_context log = { logfn, NULL };
-       struct timeval start, end, duration;
-
-       if (argc != 4)
-               usage(NULL);
-
-       if (strcmp(argv[1], "lockall") == 0)
-               lockall = tdb_lockall;
-       else if (strcmp(argv[1], "gradual") == 0) {
-#if 0
-               lockall = tdb_lockall_gradual;
-#else
-               errx(1, "gradual is now the default implementation");
-#endif
-       } else
-               usage("Arg1 should be 'lockall' or 'gradual'");
-
-       num = atoi(argv[2]);
-       worktime = atoi(argv[3]);
-
-       if (!num || !worktime)
-               usage("Number of threads and worktime must be non-zero");
-
-       if (pipe(pfd) != 0)
-               err(1, "Creating pipe");
-
-       tdb = tdb_open_ex("/tmp/starvation.tdb", 10000, TDB_DEFAULT,
-                         O_RDWR|O_CREAT|O_TRUNC, 0600, &log, NULL);
-       if (!tdb)
-               err(1, "Opening tdb /tmp/starvation.tdb");
-
-       for (i = 0; i < num; i++) {
-               switch (fork()) {
-               case 0:
-                       close(pfd[1]);
-                       fcntl(pfd[0], F_SETFL,
-                             fcntl(pfd[0], F_GETFL)|O_NONBLOCK);
-                       srandom(getpid() + i);
-                       if (tdb_reopen(tdb) != 0)
-                               err(1, "Reopening tdb %s", tdb_name(tdb));
-
-                       run_and_sleep(tdb, pfd[0], worktime);
-               case -1:
-                       err(1, "forking");
-               }
-               /* Stagger the children. */
-               usleep(random() % (1000000 / num));
-       }
-
-       close(pfd[0]);
-       sleep(1);
-       gettimeofday(&start, NULL);
-       if (lockall(tdb) != 0)
-               errx(1, "lockall failed: %s", tdb_errorstr(tdb));
-       gettimeofday(&end, NULL);
-
-       duration.tv_sec = end.tv_sec - start.tv_sec;
-       duration.tv_usec = end.tv_usec - start.tv_usec;
-       if (duration.tv_usec < 0) {
-               --duration.tv_sec;
-               duration.tv_usec += 1000000;
-       }
-
-       if (tdb_unlockall(tdb) != 0)
-               errx(1, "unlockall failed: %s", tdb_errorstr(tdb));
-       tdb_close(tdb);
-       unlink("/tmp/starvation.tdb");
-
-       printf("Took %lu.%06lu seconds\n", duration.tv_sec, duration.tv_usec);
-       return 0;
-}