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      1 /*
      2  *
      3  *   Copyright (c) International Business Machines  Corp., 2001
      4  *
      5  *   This program is free software;  you can redistribute it and/or modify
      6  *   it under the terms of the GNU General Public License as published by
      7  *   the Free Software Foundation; either version 2 of the License, or
      8  *   (at your option) any later version.
      9  *
     10  *   This program is distributed in the hope that it will be useful,
     11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
     12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
     13  *   the GNU General Public License for more details.
     14  *
     15  *   You should have received a copy of the GNU General Public License
     16  *   along with this program;  if not, write to the Free Software
     17  *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
     18  */
     19 
     20 /*
     21  * NAME
     22  *	sched_yield01.C
     23  *
     24  * DESCRIPTION
     25  *	Testcase to check that sched_yield returns correct values.
     26  *
     27  * ALGORITHM
     28  *	Call sched_yield(), check its return value. If it is 0, then pass,
     29  *	otherwise fail with proper errno!
     30  *
     31  * USAGE:  <for command-line>
     32  * sched_yield01 [-c n] [-i n] [-I x] [-P x] [-t]
     33  *     where,  -c n : Run n copies concurrently.
     34  *             -i n : Execute test n times.
     35  *             -I x : Execute test for x seconds.
     36  *             -P x : Pause for x seconds between iterations.
     37  *             -t   : Turn on syscall timing.
     38  *
     39  * HISTORY
     40  *	07/2001 Ported by Wayne Boyer
     41  *
     42  * RESTRICTIONS
     43  *	None
     44  */
     45 #include <stdio.h>
     46 #include <sched.h>
     47 #include <errno.h>
     48 #include "test.h"
     49 
     50 char *TCID = "sched_yield01";
     51 int TST_TOTAL = 1;
     52 
     53 void setup(void);
     54 void cleanup(void);
     55 
     56 int main(int ac, char **av)
     57 {
     58 	int lc;
     59 
     60 	tst_parse_opts(ac, av, NULL, NULL);
     61 
     62 	setup();
     63 
     64 	for (lc = 0; TEST_LOOPING(lc); lc++) {
     65 
     66 		/* reset tst_count in case we are looping */
     67 		tst_count = 0;
     68 
     69 		TEST(sched_yield());
     70 
     71 		if (TEST_RETURN != 0) {
     72 			tst_resm(TFAIL, "call failed - errno %d : %s",
     73 				 TEST_ERRNO, strerror(TEST_ERRNO));
     74 		} else {
     75 			tst_resm(TPASS, "sched_yield() call succeeded");
     76 		}
     77 	}
     78 	cleanup();
     79 	tst_exit();
     80 
     81 }
     82 
     83 /*
     84  * setup() - performs all ONE TIME setup for this test.
     85  */
     86 void setup(void)
     87 {
     88 
     89 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
     90 
     91 	TEST_PAUSE;
     92 }
     93 
     94 /*
     95  * cleanup() - performs all ONE TIME cleanup for this test at
     96  *	       completion or premature exit.
     97  */
     98 void cleanup(void)
     99 {
    100 
    101 }
    102