ossp-pkg/pth/pth_attr.c
1.24
/*
** GNU Pth - The GNU Portable Threads
** Copyright (c) 1999-2007 Ralf S. Engelschall <rse@engelschall.com>
**
** This file is part of GNU Pth, a non-preemptive thread scheduling
** library which can be found at http://www.gnu.org/software/pth/.
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
** USA, or contact Ralf S. Engelschall <rse@engelschall.com>.
**
** pth_attr.c: Pth thread attributes
*/
/* ``Unix -- where you can do anything
in two keystrokes, or less...''
-- Unknown */
#include "pth_p.h"
#if cpp
enum {
PTH_ATTR_GET,
PTH_ATTR_SET
};
struct pth_attr_st {
pth_t a_tid;
int a_prio;
int a_dispatches;
char a_name[PTH_TCB_NAMELEN];
int a_joinable;
unsigned int a_cancelstate;
unsigned int a_stacksize;
char *a_stackaddr;
};
#endif /* cpp */
pth_attr_t pth_attr_of(pth_t t)
{
pth_attr_t a;
if (t == NULL)
return pth_error((pth_attr_t)NULL, EINVAL);
if ((a = (pth_attr_t)malloc(sizeof(struct pth_attr_st))) == NULL)
return pth_error((pth_attr_t)NULL, ENOMEM);
a->a_tid = t;
return a;
}
pth_attr_t pth_attr_new(void)
{
pth_attr_t a;
if ((a = (pth_attr_t)malloc(sizeof(struct pth_attr_st))) == NULL)
return pth_error((pth_attr_t)NULL, ENOMEM);
a->a_tid = NULL;
pth_attr_init(a);
return a;
}
int pth_attr_destroy(pth_attr_t a)
{
if (a == NULL)
return pth_error(FALSE, EINVAL);
free(a);
return TRUE;
}
int pth_attr_init(pth_attr_t a)
{
if (a == NULL)
return pth_error(FALSE, EINVAL);
if (a->a_tid != NULL)
return pth_error(FALSE, EPERM);
a->a_prio = PTH_PRIO_STD;
pth_util_cpystrn(a->a_name, "unknown", PTH_TCB_NAMELEN);
a->a_dispatches = 0;
a->a_joinable = TRUE;
a->a_cancelstate = PTH_CANCEL_DEFAULT;
a->a_stacksize = 64*1024;
a->a_stackaddr = NULL;
return TRUE;
}
int pth_attr_get(pth_attr_t a, int op, ...)
{
va_list ap;
int rc;
va_start(ap, op);
rc = pth_attr_ctrl(PTH_ATTR_GET, a, op, ap);
va_end(ap);
return rc;
}
int pth_attr_set(pth_attr_t a, int op, ...)
{
va_list ap;
int rc;
va_start(ap, op);
rc = pth_attr_ctrl(PTH_ATTR_SET, a, op, ap);
va_end(ap);
return rc;
}
intern int pth_attr_ctrl(int cmd, pth_attr_t a, int op, va_list ap)
{
if (a == NULL)
return pth_error(FALSE, EINVAL);
switch (op) {
case PTH_ATTR_PRIO: {
/* priority */
int val, *src, *dst;
if (cmd == PTH_ATTR_SET) {
src = &val; val = va_arg(ap, int);
dst = (a->a_tid != NULL ? &a->a_tid->prio : &a->a_prio);
}
else {
src = (a->a_tid != NULL ? &a->a_tid->prio : &a->a_prio);
dst = va_arg(ap, int *);
}
*dst = *src;
break;
}
case PTH_ATTR_NAME: {
/* name */
if (cmd == PTH_ATTR_SET) {
char *src, *dst;
src = va_arg(ap, char *);
dst = (a->a_tid != NULL ? a->a_tid->name : a->a_name);
pth_util_cpystrn(dst, src, PTH_TCB_NAMELEN);
}
else {
char *src, **dst;
src = (a->a_tid != NULL ? a->a_tid->name : a->a_name);
dst = va_arg(ap, char **);
*dst = src;
}
break;
}
case PTH_ATTR_DISPATCHES: {
/* incremented on every context switch */
int val, *src, *dst;
if (cmd == PTH_ATTR_SET) {
src = &val; val = va_arg(ap, int);
dst = (a->a_tid != NULL ? &a->a_tid->dispatches : &a->a_dispatches);
}
else {
src = (a->a_tid != NULL ? &a->a_tid->dispatches : &a->a_dispatches);
dst = va_arg(ap, int *);
}
*dst = *src;
break;
}
case PTH_ATTR_JOINABLE: {
/* detachment type */
int val, *src, *dst;
if (cmd == PTH_ATTR_SET) {
src = &val; val = va_arg(ap, int);
dst = (a->a_tid != NULL ? &a->a_tid->joinable : &a->a_joinable);
}
else {
src = (a->a_tid != NULL ? &a->a_tid->joinable : &a->a_joinable);
dst = va_arg(ap, int *);
}
*dst = *src;
break;
}
case PTH_ATTR_CANCEL_STATE: {
/* cancellation state */
unsigned int val, *src, *dst;
if (cmd == PTH_ATTR_SET) {
src = &val; val = va_arg(ap, unsigned int);
dst = (a->a_tid != NULL ? &a->a_tid->cancelstate : &a->a_cancelstate);
}
else {
src = (a->a_tid != NULL ? &a->a_tid->cancelstate : &a->a_cancelstate);
dst = va_arg(ap, unsigned int *);
}
*dst = *src;
break;
}
case PTH_ATTR_STACK_SIZE: {
/* stack size */
unsigned int val, *src, *dst;
if (cmd == PTH_ATTR_SET) {
if (a->a_tid != NULL)
return pth_error(FALSE, EPERM);
src = &val; val = va_arg(ap, unsigned int);
dst = &a->a_stacksize;
}
else {
src = (a->a_tid != NULL ? &a->a_tid->stacksize : &a->a_stacksize);
dst = va_arg(ap, unsigned int *);
}
*dst = *src;
break;
}
case PTH_ATTR_STACK_ADDR: {
/* stack address */
char *val, **src, **dst;
if (cmd == PTH_ATTR_SET) {
if (a->a_tid != NULL)
return pth_error(FALSE, EPERM);
src = &val; val = va_arg(ap, char *);
dst = &a->a_stackaddr;
}
else {
src = (a->a_tid != NULL ? &a->a_tid->stack : &a->a_stackaddr);
dst = va_arg(ap, char **);
}
*dst = *src;
break;
}
case PTH_ATTR_TIME_SPAWN: {
pth_time_t *dst;
if (cmd == PTH_ATTR_SET)
return pth_error(FALSE, EPERM);
dst = va_arg(ap, pth_time_t *);
if (a->a_tid != NULL)
pth_time_set(dst, &a->a_tid->spawned);
else
pth_time_set(dst, PTH_TIME_ZERO);
break;
}
case PTH_ATTR_TIME_LAST: {
pth_time_t *dst;
if (cmd == PTH_ATTR_SET)
return pth_error(FALSE, EPERM);
dst = va_arg(ap, pth_time_t *);
if (a->a_tid != NULL)
pth_time_set(dst, &a->a_tid->lastran);
else
pth_time_set(dst, PTH_TIME_ZERO);
break;
}
case PTH_ATTR_TIME_RAN: {
pth_time_t *dst;
if (cmd == PTH_ATTR_SET)
return pth_error(FALSE, EPERM);
dst = va_arg(ap, pth_time_t *);
if (a->a_tid != NULL)
pth_time_set(dst, &a->a_tid->running);
else
pth_time_set(dst, PTH_TIME_ZERO);
break;
}
case PTH_ATTR_START_FUNC: {
void *(**dst)(void *);
if (cmd == PTH_ATTR_SET)
return pth_error(FALSE, EPERM);
if (a->a_tid == NULL)
return pth_error(FALSE, EACCES);
dst = (void *(**)(void *))va_arg(ap, void *);
*dst = a->a_tid->start_func;
break;
}
case PTH_ATTR_START_ARG: {
void **dst;
if (cmd == PTH_ATTR_SET)
return pth_error(FALSE, EPERM);
if (a->a_tid == NULL)
return pth_error(FALSE, EACCES);
dst = va_arg(ap, void **);
*dst = a->a_tid->start_arg;
break;
}
case PTH_ATTR_STATE: {
pth_state_t *dst;
if (cmd == PTH_ATTR_SET)
return pth_error(FALSE, EPERM);
if (a->a_tid == NULL)
return pth_error(FALSE, EACCES);
dst = va_arg(ap, pth_state_t *);
*dst = a->a_tid->state;
break;
}
case PTH_ATTR_EVENTS: {
pth_event_t *dst;
if (cmd == PTH_ATTR_SET)
return pth_error(FALSE, EPERM);
if (a->a_tid == NULL)
return pth_error(FALSE, EACCES);
dst = va_arg(ap, pth_event_t *);
*dst = a->a_tid->events;
break;
}
case PTH_ATTR_BOUND: {
int *dst;
if (cmd == PTH_ATTR_SET)
return pth_error(FALSE, EPERM);
dst = va_arg(ap, int *);
*dst = (a->a_tid != NULL ? TRUE : FALSE);
break;
}
default:
return pth_error(FALSE, EINVAL);
}
return TRUE;
}
