pthread_attr.c
上传用户:tsgydb
上传日期:2007-04-14
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文件大小:7k
- /* ==== pthread_attr.c =======================================================
- * Copyright (c) 1993, 1994 by Chris Provenzano, proven@mit.edu
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by Chris Provenzano.
- * 4. The name of Chris Provenzano may not be used to endorse or promote
- * products derived from this software without specific prior written
- * permission.
- *
- * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL CHRIS PROVENZANO BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * Description : Pthread attribute functions.
- *
- * 1.00 93/11/04 proven
- * -Started coding this file.
- */
- #ifndef lint
- static const char rcsid[] = "$Id$";
- #endif
- #include <pthread.h>
- #include <errno.h>
- #include <string.h>
- /* Currently we do no locking, should we just to be safe? CAP */
- /* ==========================================================================
- * pthread_attr_init()
- */
- int pthread_attr_init(pthread_attr_t *attr)
- {
- memcpy(attr, &pthread_attr_default, sizeof(pthread_attr_t));
- return(OK);
- }
- /* ==========================================================================
- * pthread_attr_destroy()
- */
- int pthread_attr_destroy(pthread_attr_t *attr)
- {
- return(OK);
- }
- /* ==========================================================================
- * pthread_attr_getstacksize()
- */
- int pthread_attr_getstacksize(pthread_attr_t *attr, size_t * stacksize)
- {
- *stacksize = attr->stacksize_attr;
- return(OK);
- }
- /* ==========================================================================
- * pthread_attr_setstacksize()
- */
- int pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize)
- {
- if (stacksize >= PTHREAD_STACK_MIN) {
- attr->stacksize_attr = stacksize;
- return(OK);
- }
- return(EINVAL);
- }
- /* ==========================================================================
- * pthread_attr_getstackaddr()
- */
- int pthread_attr_getstackaddr(pthread_attr_t *attr, void ** stackaddr)
- {
- *stackaddr = attr->stackaddr_attr;
- return(OK);
- }
- /* ==========================================================================
- * pthread_attr_setstackaddr()
- */
- int pthread_attr_setstackaddr(pthread_attr_t *attr, void * stackaddr)
- {
- attr->stackaddr_attr = stackaddr;
- return(OK);
- }
- /* ==========================================================================
- * pthread_attr_setcleanup()
- */
- int pthread_attr_setcleanup(pthread_attr_t *attr, void (*routine)(void *),
- void * arg)
- {
- attr->cleanup_attr = routine;
- attr->arg_attr = arg;
- return(OK);
- }
- /* ==========================================================================
- * pthread_attr_getdetachstate()
- */
- int pthread_attr_getdetachstate(pthread_attr_t *attr, int * detachstate)
- {
- *detachstate = attr->flags & PTHREAD_DETACHED;
- return(OK);
- }
- /* ==========================================================================
- * pthread_attr_setdetachstate()
- */
- int pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate)
- {
- attr->flags = (attr->flags & ~(PTHREAD_DETACHED)) |
- (detachstate & PTHREAD_DETACHED);
- return(OK);
- }
- /* ==========================================================================
- * pthread_attr_getfloatstate()
- */
- int pthread_attr_getfloatstate(pthread_attr_t *attr, int * floatstate)
- {
- *floatstate = attr->flags & PTHREAD_NOFLOAT;
- return(OK);
- }
- /* ==========================================================================
- * pthread_attr_setfloatstate()
- */
- int pthread_attr_setfloatstate(pthread_attr_t *attr, int floatstate)
- {
- attr->flags = (attr->flags & ~(PTHREAD_NOFLOAT)) |
- (floatstate & PTHREAD_NOFLOAT);
- return(OK);
- }
- /* ==========================================================================
- * pthread_attr_getscope()
- */
- int pthread_attr_getscope(pthread_attr_t *attr, int * contentionscope)
- {
- *contentionscope = attr->flags & PTHREAD_SCOPE_SYSTEM;
- return(OK);
- }
- /* ==========================================================================
- * pthread_attr_setscope()
- */
- int pthread_attr_setscope(pthread_attr_t *attr, int contentionscope)
- {
- int ret;
- switch (contentionscope) {
- case PTHREAD_SCOPE_PROCESS:
- attr->flags = (attr->flags & ~(PTHREAD_SCOPE_PROCESS))
- | PTHREAD_SCOPE_PROCESS;
- ret = OK;
- break;
- case PTHREAD_SCOPE_SYSTEM:
- ret = ENOSYS;
- break;
- default:
- ret = EINVAL;
- break;
- }
- return(ret);
- }
- /* ==========================================================================
- * pthread_attr_getinheritsched()
- */
- int pthread_attr_getinheritsched(pthread_attr_t *attr, int * inheritsched)
- {
- *inheritsched = attr->flags & PTHREAD_INHERIT_SCHED;
- return(OK);
- }
- /* ==========================================================================
- * pthread_attr_setinheritsched()
- */
- int pthread_attr_setinheritsched(pthread_attr_t *attr, int inheritsched)
- {
- attr->flags = (attr->flags & ~(PTHREAD_INHERIT_SCHED)) |
- (inheritsched & PTHREAD_INHERIT_SCHED);
- return(OK);
- }
- /* ==========================================================================
- * pthread_attr_getschedpolicy()
- */
- int pthread_attr_getschedpolicy(pthread_attr_t *attr, int * schedpolicy)
- {
- *schedpolicy = (int)attr->schedparam_policy;
- return(OK);
- }
- /* ==========================================================================
- * pthread_attr_setschedpolicy()
- */
- int pthread_attr_setschedpolicy(pthread_attr_t *attr, int schedpolicy)
- {
- int ret;
- switch(schedpolicy) {
- case SCHED_FIFO:
- case SCHED_IO:
- case SCHED_RR:
- attr->schedparam_policy = schedpolicy;
- ret = OK;
- break;
- default:
- ret = EINVAL;
- break;
- }
- return(ret);
- }
- /* ==========================================================================
- * pthread_attr_getschedparam()
- */
- int pthread_attr_getschedparam(pthread_attr_t *attr, struct sched_param * param)
- {
- param->sched_priority = attr->sched_priority;
- return(OK);
- }
- /* ==========================================================================
- * pthread_attr_setschedparam()
- */
- int pthread_attr_setschedparam(pthread_attr_t *attr, struct sched_param * param)
- {
- if ((param->sched_priority >= PTHREAD_MIN_PRIORITY) &&
- (param->sched_priority <= PTHREAD_MAX_PRIORITY)) {
- attr->sched_priority = param->sched_priority;
- return(OK);
- }
- return(EINVAL);
- }