From 3a8234d2440a464f5401b3444d454ac913d6b3d6 Mon Sep 17 00:00:00 2001 From: Neal H Walfield Date: Wed, 30 Oct 2019 00:03:13 +0100 Subject: libfshelp-tests: Tests for file record locking 2019-03-04 Svante Signell * test-*.c: Update code, remove test results. * README.new_tests: New file, summarize new test results. 2019-02-12 Svante Signell * test-*.c: Update code, add some test results. * Makefile: Remove extra flags. 2019-02-01 Svante Signell * Update copyright years. 2016-05-23 Svante Signell * Makefile: Add sub-directory libfshelp-tests. 2018-12-07 Svante Signell * Update copyright years. * locks.c(cmd_lock): Call fshelp_rlock_tweak() with new last argument rendezvous = MACH_PORT_NULL. 2017-01-05 Svante Signell * Update copyright years and headers. 2016-12-28 Svante Signell * Makefile: test-flock.c, test-lockf.c and test-fcntl.c * test-lockf.c: New file * Rename set-flock.c, set-fcntl.c to test-flock.c test-fcntl.c * TODO: Update README 2016-05-23 Svante Signell * Makefile: Link with pthread, add build of set-flock.c and set-fcntl.c * define temporary CPP_FLAGS until glibc is updated * set-flock.c, set-fcntl.c: New files. * Fix typos in README 2001-04-11 Neal H Walfield * ChangeLog: New file, mentioning itself in this sentence. * Makefile: New file. * README: Likewise. * fork.c: Likewise. * locks: Likewise. * locks-tests: Likewise. * locks.c: Likewise. * race.c: Likewise. --- libfshelp-tests/race.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 libfshelp-tests/race.c (limited to 'libfshelp-tests/race.c') diff --git a/libfshelp-tests/race.c b/libfshelp-tests/race.c new file mode 100644 index 00000000..a1d398ab --- /dev/null +++ b/libfshelp-tests/race.c @@ -0,0 +1,83 @@ +/* Test races in the record locking code. + + Copyright (C) 2001 Free Software Foundation, Inc. + + Written by Neal H Walfield + + 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, 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. + + You should have received a copy of the GNU General Public License + along with the GNU Hurd. If not, see . */ + +#include +#include +#include +#include +#include "fs_U.h" +#include +#include "io_U.h" + +int main (int argc, char **argv) +{ + error_t err; + struct flock64 lock; + mach_port_t rendezvous = MACH_PORT_NULL; + int fd; + int i; + uint v; + int blocked = 0; + char buf[10] = ""; + char *bufp; + + if (argc != 4) + error (1, 0, "Usage: %s file start len", argv[0]); + + lock.l_whence = SEEK_SET; + lock.l_start = atoi (argv[2]); + lock.l_len = atoi (argv[3]); + + fd = file_name_lookup (argv[1], O_READ | O_WRITE | O_CREAT, 0666); + if (fd == MACH_PORT_NULL) + error (1, errno, "file_name_lookup"); + + for (i = 0; i < 10000; i ++) + { + lock.l_type = F_WRLCK; + err = file_record_lock (fd, F_SETLK64, &lock, rendezvous, MACH_MSG_TYPE_MAKE_SEND); + if (err) + { + blocked ++; + err = file_record_lock (fd, F_SETLKW64, &lock, rendezvous, MACH_MSG_TYPE_MAKE_SEND); + } + if (err) + error (1, err, "file_record_lock"); + + v = sizeof (buf); + bufp = buf; + io_read (fd, &bufp, &v, 0, v); + + v = atoi (bufp); + sprintf (buf, "%d\n", v + 1); + + v = 10; + io_write (fd, buf, sizeof (buf), 0, &v); + if (v == 0) + error (1, errno, "write (%d)", i); + + lock.l_type = F_UNLCK; + file_record_lock (fd, F_SETLK64, &lock, rendezvous, MACH_MSG_TYPE_MAKE_SEND); + } + + mach_port_deallocate (mach_task_self (), fd); + + printf ("Was blocked %d times\n", blocked); + return 0; +} -- cgit v1.2.3