323 lines
7.9 KiB
C
323 lines
7.9 KiB
C
#include <minix/mthread.h>
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#include "global.h"
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#include "proto.h"
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static struct __mthread_attr *va_front, *va_rear;
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static void mthread_attr_add(mthread_attr_t *a);
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static void mthread_attr_remove(mthread_attr_t *a);
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static int mthread_attr_valid(mthread_attr_t *a);
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/*===========================================================================*
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* mthread_init_valid_attributes *
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*===========================================================================*/
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void mthread_init_valid_attributes(void)
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{
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/* Initialize list of valid attributs */
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va_front = va_rear = NULL;
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}
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/*===========================================================================*
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* mthread_attr_add *
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*===========================================================================*/
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static void mthread_attr_add(a)
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mthread_attr_t *a;
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{
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/* Add attribute to list of valid, initialized attributes */
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if (va_front == NULL) { /* Empty list */
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va_front = *a;
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(*a)->ma_prev = NULL;
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} else {
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va_rear->ma_next = *a;
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(*a)->ma_prev = va_rear;
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}
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(*a)->ma_next = NULL;
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va_rear = *a;
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}
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/*===========================================================================*
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* mthread_attr_destroy *
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*===========================================================================*/
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int mthread_attr_destroy(attr)
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mthread_attr_t *attr;
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{
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/* Invalidate attribute and deallocate resources. */
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mthread_init(); /* Make sure mthreads is initialized */
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if (attr == NULL)
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return(EINVAL);
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if (!mthread_attr_valid(attr))
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return(EINVAL);
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/* Valide attribute; invalidate it */
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mthread_attr_remove(attr);
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free(*attr);
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*attr = NULL;
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return(0);
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}
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/*===========================================================================*
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* mthread_attr_init *
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*===========================================================================*/
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int mthread_attr_init(attr)
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mthread_attr_t *attr; /* Attribute */
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{
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/* Initialize the attribute to a known state. */
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struct __mthread_attr *a;
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mthread_init(); /* Make sure mthreads is initialized */
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if (attr == NULL)
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return(EAGAIN);
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else if (mthread_attr_valid(attr))
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return(EBUSY);
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if ((a = malloc(sizeof(struct __mthread_attr))) == NULL)
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return(-1);
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a->ma_detachstate = MTHREAD_CREATE_JOINABLE;
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a->ma_stackaddr = NULL;
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a->ma_stacksize = (size_t) 0;
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*attr = (mthread_attr_t) a;
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mthread_attr_add(attr); /* Validate attribute: attribute now in use */
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return(0);
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}
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/*===========================================================================*
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* mthread_attr_getdetachstate *
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*===========================================================================*/
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int mthread_attr_getdetachstate(attr, detachstate)
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mthread_attr_t *attr;
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int *detachstate;
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{
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/* Get detachstate of a thread attribute */
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struct __mthread_attr *a;
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mthread_init(); /* Make sure mthreads is initialized */
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if (attr == NULL)
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return(EINVAL);
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a = (struct __mthread_attr *) *attr;
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if (!mthread_attr_valid(attr))
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return(EINVAL);
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*detachstate = a->ma_detachstate;
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return(0);
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}
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/*===========================================================================*
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* mthread_attr_setdetachstate *
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*===========================================================================*/
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int mthread_attr_setdetachstate(attr, detachstate)
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mthread_attr_t *attr;
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int detachstate;
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{
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/* Set detachstate of a thread attribute */
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struct __mthread_attr *a;
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mthread_init(); /* Make sure mthreads is initialized */
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if (attr == NULL)
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return(EINVAL);
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a = (struct __mthread_attr *) *attr;
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if (!mthread_attr_valid(attr))
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return(EINVAL);
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else if(detachstate != MTHREAD_CREATE_JOINABLE &&
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detachstate != MTHREAD_CREATE_DETACHED)
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return(EINVAL);
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a->ma_detachstate = detachstate;
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return(0);
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}
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/*===========================================================================*
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* mthread_attr_getstack *
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*===========================================================================*/
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int mthread_attr_getstack(attr, stackaddr, stacksize)
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mthread_attr_t *attr;
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void **stackaddr;
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size_t *stacksize;
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{
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/* Get stack attribute */
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struct __mthread_attr *a;
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mthread_init(); /* Make sure mthreads is initialized */
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if (attr == NULL)
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return(EINVAL);
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a = (struct __mthread_attr *) *attr;
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if (!mthread_attr_valid(attr))
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return(EINVAL);
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*stackaddr = a->ma_stackaddr;
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*stacksize = a->ma_stacksize;
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return(0);
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}
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/*===========================================================================*
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* mthread_attr_getstacksize *
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*===========================================================================*/
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int mthread_attr_getstacksize(attr, stacksize)
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mthread_attr_t *attr;
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size_t *stacksize;
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{
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/* Get stack size attribute */
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struct __mthread_attr *a;
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mthread_init(); /* Make sure mthreads is initialized */
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if (attr == NULL)
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return(EINVAL);
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a = (struct __mthread_attr *) *attr;
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if (!mthread_attr_valid(attr))
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return(EINVAL);
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*stacksize = a->ma_stacksize;
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return(0);
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}
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/*===========================================================================*
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* mthread_attr_setstack *
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*===========================================================================*/
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int mthread_attr_setstack(attr, stackaddr, stacksize)
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mthread_attr_t *attr;
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void *stackaddr;
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size_t stacksize;
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{
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/* Set stack attribute */
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struct __mthread_attr *a;
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mthread_init(); /* Make sure mthreads is initialized */
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if (attr == NULL)
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return(EINVAL);
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a = (struct __mthread_attr *) *attr;
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if (!mthread_attr_valid(attr) || stacksize < MTHREAD_STACK_MIN)
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return(EINVAL);
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/* We don't care about address alignment (POSIX standard). The ucontext
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* system calls will make sure that the provided stack will be aligned (at
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* the cost of some memory if needed).
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*/
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a->ma_stackaddr = stackaddr;
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a->ma_stacksize = stacksize;
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return(0);
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}
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/*===========================================================================*
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* mthread_attr_setstacksize *
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*===========================================================================*/
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int mthread_attr_setstacksize(attr, stacksize)
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mthread_attr_t *attr;
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size_t stacksize;
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{
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/* Set stack size attribute */
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struct __mthread_attr *a;
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mthread_init(); /* Make sure mthreads is initialized */
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if (attr == NULL)
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return(EINVAL);
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a = (struct __mthread_attr *) *attr;
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if (!mthread_attr_valid(attr) || stacksize < MTHREAD_STACK_MIN)
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return(EINVAL);
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a->ma_stacksize = stacksize;
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return(0);
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}
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/*===========================================================================*
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* mthread_attr_remove *
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*===========================================================================*/
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static void mthread_attr_remove(a)
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mthread_attr_t *a;
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{
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/* Remove attribute from list of valid, initialized attributes */
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if ((*a)->ma_prev == NULL)
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va_front = (*a)->ma_next;
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else
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(*a)->ma_prev->ma_next = (*a)->ma_next;
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if ((*a)->ma_next == NULL)
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va_rear = (*a)->ma_prev;
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else
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(*a)->ma_next->ma_prev = (*a)->ma_prev;
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}
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/*===========================================================================*
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* mthread_attr_valid *
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*===========================================================================*/
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static int mthread_attr_valid(a)
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mthread_attr_t *a;
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{
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/* Check to see if attribute is on the list of valid attributes */
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struct __mthread_attr *loopitem;
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mthread_init(); /* Make sure mthreads is initialized */
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loopitem = va_front;
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while (loopitem != NULL) {
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if (loopitem == *a)
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return(1);
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loopitem = loopitem->ma_next;
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}
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return(0);
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}
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/*===========================================================================*
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* mthread_attr_verify *
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*===========================================================================*/
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#ifdef MDEBUG
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int mthread_attr_verify(void)
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{
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/* Return true when no attributes are in use */
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struct __mthread_attr *loopitem;
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mthread_init(); /* Make sure mthreads is initialized */
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loopitem = va_front;
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while (loopitem != NULL) {
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loopitem = loopitem->ma_next;
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return(0);
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}
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return(1);
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}
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#endif
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