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 that are created after this call completes inherit 12 * their scheduling policy from the process. 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 if (sched_getparam(getpid(), ¶m) != 0) { 39 perror("An error occurs when calling sched_getparam()"); 40 pthread_exit((void *)-1); 41 } 42 43 /* Make sure new policy != old policy */ 44 new_policy = (sched_getscheduler(getpid()) == SCHED_FIFO) ? 45 SCHED_RR : SCHED_FIFO; 46 47 param.sched_priority = sched_get_priority_min(new_policy); 48 if (sched_setscheduler(getpid(), new_policy, ¶m) == -1) { 49 if (errno == EPERM) { 50 printf 51 ("This process does not have the permission to set its own scheduling policy.\nTry to launch this test as root.\n"); 52 return PTS_UNRESOLVED; 53 } 54 perror("An error occurs when calling sched_setscheduler()"); 55 return PTS_UNRESOLVED; 56 } 57 58 if (pthread_attr_init(&attr) != 0) { 59 printf("An error occurs when calling pthread_attr_init()"); 60 return PTS_UNRESOLVED; 61 } 62 result = pthread_attr_setscope(&attr, PTHREAD_SCOPE_PROCESS); 63 if (result == ENOTSUP) { 64 printf("Process contention scope threads are not supported.\n"); 65 return PTS_UNSUPPORTED; 66 } else if (result != 0) { 67 printf("An error occurs when calling pthread_attr_setscope()"); 68 return PTS_UNRESOLVED; 69 } 70 if (pthread_create(&tid, &attr, runner, NULL) != 0) { 71 printf("An error occurs when calling pthread_create()"); 72 return PTS_UNRESOLVED; 73 } 74 75 if (pthread_getschedparam(tid, &policy, ¶m) != 0) { 76 printf("An error occurs when calling pthread_getschedparam()"); 77 return PTS_UNRESOLVED; 78 } 79 80 pthread_cancel(tid); 81 82 if (policy == new_policy) { 83 printf("Test PASSED\n"); 84 return PTS_PASS; 85 } 86 printf("The thread does not inherit the right policy.\n"); 87 return PTS_FAIL; 88 } 89
