C++ sched_getparam函数代码示例

int main() {
	int old_priority;
	struct sched_param param;

	if (sched_getparam(0, &param) == -1) {
		perror("An error occurs when calling sched_getparam()");
		return PTS_UNRESOLVED;
	}
	old_priority = param.sched_priority;

	param.sched_ss_max_repl = 0;
	param.sched_priority++;
	sched_setparam(0,&param);

	if (sched_getparam(0, &param) != 0) {
		perror("An error occurs when calling sched_getparam()");
		return PTS_UNRESOLVED;
	}

	if (param.sched_priority == old_priority) {
		printf("Test PASSED\n");
		return PTS_PASS;
	} else {
		printf("The priority have changed.\n");
		return PTS_FAIL;
	}

}

int main()
{
	int old_priority;
	struct sched_param param;

	if (sched_getparam(0, &param) == -1) {
		perror("An error occurs when calling sched_getparam()");
		return PTS_UNRESOLVED;
	}
	old_priority = param.sched_priority;

	/* set a sched_ss_repl_period lower than the sched_ss_init_budget */
	param.sched_ss_repl_period.tv_sec = 1;
	param.sched_ss_repl_period.tv_nsec = 0;

	param.sched_ss_init_budget.tv_sec = 2;
	param.sched_ss_init_budget.tv_nsec = 0;

	param.sched_priority++;
	sched_setparam(0, &param);

	if (sched_getparam(0, &param) != 0) {
		perror("An error occurs when calling sched_getparam()");
		return PTS_UNRESOLVED;
	}

	if (param.sched_priority == old_priority) {
		printf("Test PASSED\n");
		return PTS_PASS;
	} else {
		printf("The priority have changed.\n");
		return PTS_FAIL;
	}
}

int main(void)
{
    int old_priority, old_policy, new_policy;
    struct sched_param param;
    int invalid_policy;
    char *label;
    pid_t pid = getpid();
    int rc;

    invalid_policy = INT_MAX;

    label = "sched_getparam()";
    rc = sched_getparam(pid, &param);
    if (rc)
        goto unresolved;
    old_priority = param.sched_priority;

    label = "sched_getscheduler()";
    rc = sched_getscheduler(pid);
    if (rc < 0)
        goto unresolved;
    old_policy = rc;

    label = "sched_setscheduler() - invalid policy succeeded?";
    rc = sched_setscheduler(0, invalid_policy, &param);
    if (!rc)
        goto unresolved;

    label = "sched_getparam()";
    rc = sched_getparam(pid, &param);
    if (rc)
        goto unresolved;

    label = "sched_getscheduler()";
    rc = sched_getscheduler(pid);
    if (rc < 0)
        goto unresolved;
    new_policy = rc;

    if (old_policy != new_policy) {
        printf("Failed: invalid policy change, old: %u, new %u\n",
               old_policy, new_policy);
        exit(PTS_FAIL);
    }

    if (old_priority != param.sched_priority) {
        printf("Failed: invalid priority change, old: %u, new %u\n",
               old_priority, param.sched_priority);
        exit(PTS_FAIL);
    }

    printf("Test PASSED\n");
    return PTS_PASS;

unresolved:
    ERR_MSG(label, rc);
    return PTS_UNRESOLVED;
}

int main(){
	int old_priority, old_policy, new_policy;
	struct sched_param param;
	int invalid_policy;

	invalid_policy = 0;
	/* Linux does not treat minus value as invalid for policy */
	while(invalid_policy == SCHED_OTHER || 
		invalid_policy == SCHED_FIFO ||
		invalid_policy == SCHED_RR ||
		invalid_policy == SCHED_BATCH)
	invalid_policy++;

	if(sched_getparam(getpid(), &param) == -1) {
		perror("An error occurs when calling sched_getparam()");
		return PTS_UNRESOLVED;
	}	
	old_priority = param.sched_priority;

	old_policy = sched_getscheduler(getpid());
	if(old_policy == -1) {
		perror("An error occurs when calling sched_getscheduler()");
		return PTS_UNRESOLVED;
	}

	sched_setscheduler(0, invalid_policy, &param);

	if(errno == 0) {
		printf("No error occurs, could %i be a valid value for the scheduling policy ???\n", invalid_policy);
		return PTS_UNRESOLVED;
	}

	if(sched_getparam(getpid(), &param) != 0) {
		perror("An error occurs when calling sched_getparam()");
		return PTS_UNRESOLVED;
	}

	new_policy = sched_getscheduler(getpid());
	if(new_policy == -1) {
		perror("An error occurs when calling sched_getscheduler()");
		return PTS_UNRESOLVED;
	}
		

	if(old_policy == new_policy && 
	   old_priority == param.sched_priority) {
		printf("Test PASSED\n");
		return PTS_PASS;
	}
	
	if(param.sched_priority != old_priority) {
		printf("The param has changed\n");
	}
	if(new_policy != old_policy) {
		printf("The policy has changed\n");
	}
	return PTS_FAIL;
}

int main(){
	int policy, result;
	int old_priority, old_policy, new_policy;
	struct sched_param param;

	if(sched_getparam(getpid(), &param) != 0) {
		perror("An error occurs when calling sched_getparam()");
		return PTS_UNRESOLVED;
	}	
	old_priority = param.sched_priority;

	old_policy = sched_getscheduler(getpid());
	if(old_policy == -1) {
		perror("An error occurs when calling sched_getscheduler()");
		return PTS_UNRESOLVED;
	}

	/* set a sched_ss_repl_period lower than the sched_ss_init_budget */
	param.sched_ss_repl_period.tv_sec = 1;
	param.sched_ss_repl_period.tv_nsec = 0;

	param.sched_ss_init_budget.tv_sec = 2;
	param.sched_ss_init_budget.tv_nsec = 0;
	
	param.sched_priority = sched_get_priority_max(SCHED_SPORADIC);

	result = sched_setscheduler(0, SCHED_SPORADIC, &param);
      
	if(sched_getparam(getpid(), &param) != 0) {
		perror("An error occurs when calling sched_getparam()");
		return PTS_UNRESOLVED;
	}

	new_policy = sched_getscheduler(getpid());
	if(new_policy == -1) {
		perror("An error occurs when calling sched_getscheduler()");
		return PTS_UNRESOLVED;
	}
		

	if(old_policy == new_policy && 
	   old_priority == param.sched_priority) {
		printf("Test PASSED\n");
		return PTS_PASS;
	}
	
	if(param.sched_priority != old_priority) {
		printf("The param has changed\n");
	}
	if(new_policy != old_policy) {
		printf("The policy has changed\n");
	}
	return PTS_FAIL;
	

}

int main(void)
{
	int invalid_priority;
	int old_priority, old_policy, new_policy;
	struct sched_param param;

	if (sched_getparam(getpid(), &param) != 0) {
		perror("An error occurs when calling sched_getparam()");
		return PTS_UNRESOLVED;
	}
	old_priority = param.sched_priority;

	old_policy = sched_getscheduler(getpid());
	if (old_policy == -1) {
		perror("An error occurs when calling sched_getscheduler()");
		return PTS_UNRESOLVED;
	}

	invalid_priority = sched_get_priority_max(SCHED_SPORADIC);
	if (invalid_priority == -1) {
		perror("An error occurs when calling sched_get_priority_max()");
		return PTS_UNRESOLVED;
	}

	/* set an invalid priority */
	invalid_priority++;
	param.sched_ss_low_priority = invalid_priority;

	sched_setscheduler(0, SCHED_SPORADIC, &param);

	if (sched_getparam(getpid(), &param) != 0) {
		perror("An error occurs when calling sched_getparam()");
		return PTS_UNRESOLVED;
	}

	new_policy = sched_getscheduler(getpid());
	if (new_policy == -1) {
		perror("An error occurs when calling sched_getscheduler()");
		return PTS_UNRESOLVED;
	}

	if (old_policy == new_policy && old_priority == param.sched_priority) {
		printf("Test PASSED\n");
		return PTS_PASS;
	}

	if (param.sched_priority != old_priority) {
		printf("The param has changed\n");
	}
	if (new_policy != old_policy) {
		printf("The policy has changed\n");
	}
	return PTS_FAIL;

}

int main() {
	int max_priority, old_priority, old_policy, new_policy;
	struct sched_param param;

	if (sched_getparam(getpid(), &param) == -1) {
		perror("An error occurs when calling sched_getparam()");
		return PTS_UNRESOLVED;
	}
	old_priority = param.sched_priority;

	old_policy = sched_getscheduler(getpid());
	if (old_policy == -1) {
		perror("An error occurs when calling sched_getscheduler()");
		return PTS_UNRESOLVED;
	}

	/* Make sure that param.sched_priority != old_priority */
	max_priority = sched_get_priority_max(SCHED_SPORADIC);
	param.sched_priority = (old_priority == max_priority) ?
		sched_get_priority_min(SCHED_SPORADIC) :
		max_priority;

	param.sched_ss_max_repl = 0;

	sched_setscheduler(0, SCHED_SPORADIC, &param);

	if (sched_getparam(getpid(), &param) != 0) {
		perror("An error occurs when calling sched_getparam()");
		return PTS_UNRESOLVED;
	}

	new_policy = sched_getscheduler(getpid());
	if (new_policy == -1) {
		perror("An error occurs when calling sched_getscheduler()");
		return PTS_UNRESOLVED;
	}

	if (old_policy == new_policy &&
	   old_priority == param.sched_priority) {
		printf("Test PASSED\n");
		return PTS_PASS;
	}

	if (param.sched_priority != old_priority) {
		printf("The param has changed\n");
		return PTS_FAIL;
	}
	if (new_policy != old_policy) {
		printf("The policy has changed\n");
		return PTS_FAIL;
	}

}

/*------------------------------------------------------------------------------
 *  Set POSIX real-time scheduling
 *----------------------------------------------------------------------------*/
void
DarkIce :: setRealTimeScheduling ( void )               throw ( Exception )
{
// Only if the OS has the POSIX real-time scheduling functions implemented.
#if defined( HAVE_SCHED_GETSCHEDULER ) && defined( HAVE_SCHED_GETPARAM )
    int                 high_priority;
    struct sched_param  param;

    /* store the old scheduling parameters */
    if ( (origSchedPolicy = sched_getscheduler(0)) == -1 ) {
        throw Exception( __FILE__, __LINE__, "sched_getscheduler", errno);
    }

    if ( sched_getparam( 0, &param) == -1 ) {
        throw Exception( __FILE__, __LINE__, "sched_getparam", errno);
    }
    origSchedPriority = param.sched_priority;
    
    /* set SCHED_FIFO with max - 1 priority or user configured value */
    if ( (high_priority = sched_get_priority_max(SCHED_FIFO)) == -1 ) {
        throw Exception(__FILE__,__LINE__,"sched_get_priority_max",errno);
    }
    reportEvent( 8, "scheduler high priority", high_priority);

    if (realTimeSchedPriority > high_priority) {
        param.sched_priority = high_priority - 1;
    } else {
        param.sched_priority = realTimeSchedPriority;
    }

    if ( sched_setscheduler( 0, SCHED_FIFO, &param) == -1 ) {
        reportEvent( 1,
                     "Could not set POSIX real-time scheduling, "
                     "this may cause recording skips.\n"
                     "Try to run darkice as the super-user.");
    } else {
        /* ask the new priortiy and report it */
        if ( sched_getparam( 0, &param) == -1 ) {
            throw Exception( __FILE__, __LINE__, "sched_getparam", errno);
        }

        reportEvent( 1,
                     "Using POSIX real-time scheduling, priority",
                     param.sched_priority );
    }
#else
    reportEvent( 1, "POSIX scheduling not supported on this system, "
                    "this may cause recording skips");
#endif // HAVE_SCHED_GETSCHEDULER && HAVE_SCHED_GETPARAM
}

/*------------------------------------------------------------------------------
 *  Set POSIX real-time scheduling, if super-user
 *----------------------------------------------------------------------------*/
void
DarkIce :: setRealTimeScheduling ( void )               throw ( Exception )
{
    uid_t   euid;

    euid = geteuid();

    if ( euid == 0 ) {
        int                 high_priority;
        struct sched_param  param;

        /* store the old scheduling parameters */
        if ( (origSchedPolicy = sched_getscheduler(0)) == -1 ) {
            throw Exception( __FILE__, __LINE__, "sched_getscheduler", errno);
        }

        if ( sched_getparam( 0, &param) == -1 ) {
            throw Exception( __FILE__, __LINE__, "sched_getparam", errno);
        }
        origSchedPriority = param.sched_priority;
        
        /* set SCHED_FIFO with max - 1 priority */
        if ( (high_priority = sched_get_priority_max(SCHED_FIFO)) == -1 ) {
            throw Exception(__FILE__,__LINE__,"sched_get_priority_max",errno);
        }
        reportEvent( 8, "scheduler high priority", high_priority);

        param.sched_priority = high_priority - 1;

        if ( sched_setscheduler( 0, SCHED_FIFO, &param) == -1 ) {
            throw Exception( __FILE__, __LINE__, "sched_setscheduler", errno);
        }

        /* ask the new priortiy and report it */
        if ( sched_getparam( 0, &param) == -1 ) {
            throw Exception( __FILE__, __LINE__, "sched_getparam", errno);
        }

        reportEvent( 1,
                     "Using POSIX real-time scheduling, priority",
                     param.sched_priority );
    } else {
        reportEvent( 1,
        "Not running as super-user, unable to use POSIX real-time scheduling" );
        reportEvent( 1,
        "It is recommended that you run this program as super-user");
    }
}

int main(int argc, char **argv)
{

	struct sched_param param;
	int result = -1;

	param.sched_priority = -1;

	result = sched_getparam(0, &param);

	if (result == 0 && param.sched_priority != -1 && errno == 0) {
		printf("Test PASSED\n");
		return PTS_PASS;
	}

	if (errno != 0) {
		perror("Unexpected error");
		return PTS_FAIL;
	}

	if (result != 0) {
		printf("returned code is not zero.\n");
		return PTS_FAIL;
	} else {
		perror("Unresolved test error");
		return PTS_UNRESOLVED;
	}

	printf("This code should not be executed.\n");
	return PTS_UNRESOLVED;
}

int go_realtime(void)
{
	int max_pri;
	struct sched_param sp;

	if (sched_getparam(0, &sp)) {
		perror("sched_getparam");
		return -1;
	}

	max_pri = sched_get_priority_max(SCHED_FIFO);
	sp.sched_priority = REALTIME_PRIORITY;

	if (sp.sched_priority > max_pri) {
		fprintf(stderr, "Invalid priority (maximum %d)\n", max_pri);
		return -1;
	}

	if (sched_setscheduler(0, SCHED_FIFO, &sp)) {
		perror("sched_setscheduler");
		return -1;
	}

	return 0;
}

int
main(int argc, char *argv[])
{
    int j, pol;
    struct sched_param sp;

    for (j = 1; j < argc; j++) {
        pol = sched_getscheduler(getLong(argv[j], 0, "pid"));
        if (pol == -1)
            errExit("sched_getscheduler");

        if (sched_getparam(getLong(argv[j], 0, "pid"), &sp) == -1)
            errExit("sched_getparam");

        printf("%s: %-5s ", argv[j],
                (pol == SCHED_OTHER) ? "OTHER" :
                (pol == SCHED_RR) ? "RR" :
                (pol == SCHED_FIFO) ? "FIFO" :
#ifdef SCHED_BATCH              /* Linux-specific */
                (pol == SCHED_BATCH) ? "BATCH" :
#endif
#ifdef SCHED_IDLE               /* Linux-specific */
                (pol == SCHED_IDLE) ? "IDLE" :
#endif
                "???");
        printf("%2d\n", sp.sched_priority);
    }

    exit(EXIT_SUCCESS);
}

int main(){
	int result;
        struct sched_param param;

        /* We assume process Number 1 is created by root */
        /* and can only be accessed by root */ 
        /* This test should be run under standard user permissions */
        if (getuid() == 0) {
	  	if (set_nonroot() != 0) {
			  printf("Cannot run this test as non-root user\n");	
                return PTS_UNTESTED;
        }
        }

	if(sched_getparam(0, &param) == -1) {
		perror("An error occurs when calling sched_getparam()");
		return PTS_UNRESOLVED;
	}

	result = sched_setparam(1, &param);

	if(result == -1 && errno == EPERM) {
		printf("Test PASSED\n");
		return PTS_PASS;
	} else if(errno != EPERM) {
	        perror("errno is not EPERM");
		return PTS_FAIL;
	} else {
		printf("The returned code is not -1.\n");
		return PTS_FAIL;
	}
}

int main()
{
	int policy, result;
	struct sched_param param;

	if (sched_getparam(0, &param) != 0) {
		perror("An error occurs when calling sched_getparam()");
		return PTS_UNRESOLVED;
	}

	/* set a sched_ss_repl_period lower than the sched_ss_init_budget */
	param.sched_ss_repl_period.tv_sec = 1;
	param.sched_ss_repl_period.tv_nsec = 0;

	param.sched_ss_init_budget.tv_sec = 2;
	param.sched_ss_init_budget.tv_nsec = 0;

	param.sched_priority = sched_get_priority_max(SCHED_SPORADIC);

	result = sched_setscheduler(0, SCHED_SPORADIC, &param);

	if (result == -1 && errno == EINVAL) {
		printf("Test PASSED\n");
		return PTS_PASS;
	} else if (result != -1) {
		printf("The returned code is not -1.\n");
		return PTS_FAIL;
	} else if (errno == EPERM) {
		printf
		    ("This process does not have the permission to set its own scheduling policy.\nTry to launch this test as root.\n");
		return PTS_UNRESOLVED;
	}
	perror("Unknow error");
	return PTS_FAIL;
}

static int raise_priority()
{
    int max_pri;
    struct sched_param sp;

    fprintf(stderr, "Setting scheduler priority...\n");

    if (sched_getparam(0, &sp)) {
        perror("sched_getparam");
        return -1;
    }

    max_pri = sched_get_priority_max(SCHED_FIFO);
    sp.sched_priority = REALTIME_PRIORITY;

    if (sp.sched_priority > max_pri) {
        fprintf(stderr, "Invalid scheduling priority (maximum %d).\n", max_pri);
        return -1;
    }

    if (sched_setscheduler(0, SCHED_FIFO, &sp)) {
        perror("sched_setscheduler");
        fprintf(stderr, "Failed to set scheduler. Run as root otherwise you "
                "may get wow and skips!\n");
    }

    return 0;
}