128 lines
2.7 KiB
C
128 lines
2.7 KiB
C
/*
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* Copyright (C) 2015 Cyril Hrubis <chrubis@suse.cz>
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*
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* Licensed under the GNU GPLv2 or later.
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* Block several processes on a mutex, then wake them up.
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*/
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include "test.h"
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#include "safe_macros.h"
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#include "futextest.h"
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const char *TCID="futex_wake03";
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const int TST_TOTAL=11;
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static futex_t *futex;
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static void do_child(void)
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{
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futex_wait(futex, *futex, NULL, 0);
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exit(0);
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}
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static void do_wake(int nr_children)
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{
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int res, i, cnt;
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res = futex_wake(futex, nr_children, 0);
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if (res != nr_children) {
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tst_resm(TFAIL,
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"futex_wake() woken up %i children, expected %i",
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res, nr_children);
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return;
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}
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for (cnt = 0, i = 0; i < 100000; i++) {
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while (waitpid(-1, &res, WNOHANG) > 0)
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cnt++;
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if (cnt == nr_children)
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break;
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usleep(100);
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}
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if (cnt != nr_children) {
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tst_resm(TFAIL, "reaped only %i childs, expected %i",
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cnt, nr_children);
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} else {
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tst_resm(TPASS, "futex_wake() woken up %i childs", cnt);
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}
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}
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static void verify_futex_wake(void)
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{
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int i, res;
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pid_t pids[55];
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for (i = 0; i < (int)ARRAY_SIZE(pids); i++) {
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pids[i] = tst_fork();
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switch (pids[i]) {
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case -1:
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tst_brkm(TBROK | TERRNO, NULL, "fork()");
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case 0:
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do_child();
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default:
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break;
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}
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}
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for (i = 0; i < (int)ARRAY_SIZE(pids); i++)
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tst_process_state_wait2(pids[i], 'S');
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for (i = 1; i <= 10; i++)
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do_wake(i);
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res = futex_wake(futex, 1, 0);
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if (res) {
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tst_resm(TFAIL, "futex_wake() woken up %u, none were waiting",
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res);
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} else {
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tst_resm(TPASS, "futex_wake() woken up 0 children");
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}
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}
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static void setup(void)
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{
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futex = SAFE_MMAP(NULL, NULL, sizeof(*futex), PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_SHARED, -1, 0);
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*futex = FUTEX_INITIALIZER;
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}
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int main(int argc, char *argv[])
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{
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int lc;
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tst_parse_opts(argc, argv, NULL, NULL);
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setup();
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for (lc = 0; TEST_LOOPING(lc); lc++)
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verify_futex_wake();
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tst_exit();
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}
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