1 /* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License version 2. 4 * 5 * This program is distributed in the hope that it will be useful, 6 * but WITHOUT ANY WARRANTY; without even the implied warranty of 7 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 8 * GNU General Public License for more details. 9 * 10 * Test that the underlying kernel-scheduled entities for the process 11 * contention scope threads have their scheduling policy changed to the 12 * value specified in param. 13 */ 14 15 #include <sched.h> 16 #include <stdio.h> 17 #include <pthread.h> 18 #include <unistd.h> 19 #include <errno.h> 20 #include "posixtest.h" 21 22 void *runner(void *arg) 23 { 24 (void) arg; 25 26 while (1) 27 sleep(1); 28 return NULL; 29 } 30 31 int main(void) 32 { 33 int new_policy, policy, result; 34 struct sched_param param; 35 pthread_t tid; 36 pthread_attr_t attr; 37 38 /* Make sure new policy != old policy */ 39 new_policy = (sched_getscheduler(getpid()) == SCHED_FIFO) ? 40 SCHED_RR : SCHED_FIFO; 41 42 if (pthread_attr_init(&attr) != 0) { 43 printf("An error occurs when calling pthread_attr_init()"); 44 return PTS_UNRESOLVED; 45 } 46 result = pthread_attr_setscope(&attr, PTHREAD_SCOPE_PROCESS); 47 if (result == ENOTSUP) { 48 printf("Process contention scope threads are not supported.\n"); 49 return PTS_UNSUPPORTED; 50 } else if (result != 0) { 51 printf("An error occurs when calling pthread_attr_setscope()"); 52 return PTS_UNRESOLVED; 53 } 54 if (pthread_create(&tid, &attr, runner, NULL) != 0) { 55 printf("An error occurs when calling pthread_create()"); 56 return PTS_UNRESOLVED; 57 } 58 59 param.sched_priority = sched_get_priority_min(new_policy); 60 if (sched_setscheduler(getpid(), new_policy, ¶m) == -1) { 61 if (errno == EPERM) { 62 printf 63 ("This process does not have the permission to set its own scheduling policy.\nTry to launch this test as root.\n"); 64 return PTS_UNRESOLVED; 65 } 66 perror("An error occurs when calling sched_setscheduler()"); 67 return PTS_UNRESOLVED; 68 } 69 70 if (pthread_getschedparam(tid, &policy, ¶m) != 0) { 71 printf("An error occurs when calling pthread_getschedparam()"); 72 return PTS_UNRESOLVED; 73 } 74 75 pthread_cancel(tid); 76 77 if (policy == new_policy) { 78 printf("Test PASSED\n"); 79 return PTS_PASS; 80 } 81 printf("sched_setscheduler() does not set the right policy.\n"); 82 return PTS_FAIL; 83 } 84
