openldap/libraries/libldap_r/thr_lwp.c

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1999-01-17 23:46:19 +08:00
/*
* Copyright 1998,1999 The OpenLDAP Foundation, Redwood City, California, USA
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted only
* as authorized by the OpenLDAP Public License. A copy of this
* license is available at http://www.OpenLDAP.org/license.html or
* in file LICENSE in the top-level directory of the distribution.
*/
/* thr_lwp.c - wrappers around SunOS LWP threads */
/* BUGS:
* - slurpd calls the get_stack/free_stack functions. Should be fixed, so
* they can become static.
*/
#include "portable.h"
#include "ldap_pvt_thread.h"
#if defined( HAVE_LWP )
/*************
* *
* SunOS LWP *
* *
*************/
#include <stdio.h>
#include <ac/time.h>
#include <ac/socket.h>
#include "lber.h"
#include "ldap.h"
#include "ldap_log.h"
#include <lwp/lwp.h>
#include <lwp/stackdep.h>
#define MAX_STACK 51200
#define MAX_THREADS 20
struct stackinfo {
int stk_inuse;
stkalign_t *stk_stack;
};
static struct stackinfo *stacks;
stkalign_t * ldap_pvt_thread_get_stack( int *stacknop )
{
int i;
if ( stacks == NULL ) {
stacks = (struct stackinfo *) ch_calloc( 1, MAX_THREADS *
sizeof(struct stackinfo) );
}
for ( i = 0; i < MAX_THREADS; i++ ) {
if ( stacks[i].stk_inuse == 0 ) {
break;
}
}
if ( i == MAX_THREADS ) {
Debug( LDAP_DEBUG_ANY,
"no more stacks (max %d) - increase MAX_THREADS for more",
MAX_THREADS, 0, 0 );
return( NULL );
}
if ( stacks[i].stk_stack == NULL ) {
stacks[i].stk_stack = (stkalign_t *) malloc(
(MAX_STACK / sizeof(stkalign_t) + 1 )
* sizeof(stkalign_t) );
}
*stacknop = i;
stacks[i].stk_inuse = 1;
return( stacks[i].stk_stack + MAX_STACK / sizeof(stkalign_t) );
}
void
ldap_pvt_thread_free_stack( int stackno )
{
if ( stackno < 0 || stackno > MAX_THREADS ) {
Debug( LDAP_DEBUG_ANY, "free_stack of bogus stack %d",
stackno, 0, 0 );
}
stacks[stackno].stk_inuse = 0;
}
static void
lwp_create_stack( void *(*func)(), void *arg, int stackno )
{
(*func)( arg );
ldap_pvt_thread_free_stack( stackno );
}
int
ldap_pvt_thread_create( ldap_pvt_thread_t * thread,
ldap_pvt_thread_attr_t *attr,
void *(*start_routine)( void *), void *arg)
{
stkalign_t *stack;
int stackno;
if ( (stack = ldap_pvt_thread_get_stack( &stackno )) == NULL ) {
return( -1 );
}
return( lwp_create( thread, lwp_create_stack, MINPRIO, 0,
stack, 3, start_routine, arg, stackno ) );
}
void
ldap_pvt_thread_exit( void *retval )
{
lwp_destroy( SELF );
}
int
ldap_pvt_thread_join( ldap_pvt_thread_t thread, void **thread_return )
{
lwp_join( thread );
return 0;
}
int
ldap_pvt_thread_kill( ldap_pvt_thread_t thread, int signo )
{
return 0;
}
int
ldap_pvt_thread_yield( void )
{
lwp_yield( SELF );
return 0;
}
int
ldap_pvt_thread_attr_init( ldap_pvt_thread_attr_t *attr )
{
*attr = 0;
return( 0 );
}
int
ldap_pvt_thread_attr_destroy( ldap_pvt_thread_attr_t *attr )
{
return( 0 );
}
int
ldap_pvt_thread_attr_setdetachstate( ldap_pvt_thread_attr_t *attr, int dstate )
{
*attr = dstate;
return( 0 );
}
int
ldap_pvt_thread_attr_getdetachstate( pthread_attr_t *attr, int *detachstate )
{
*detachstate = *attr;
return( 0 );
}
int
ldap_pvt_thread_cond_init( ldap_pvt_thread_cond_t *cond,
ldap_pvt_thread_condattr_t *attr )
{
/*
* lwp cv_create requires the monitor id be passed in
* when the cv is created, pthreads passes it when the
* condition is waited for. so, we fake the creation
* here and actually do it when the cv is waited for
* later.
*/
cond->lcv_created = 0;
return( 0 );
}
int
ldap_pvt_thread_cond_signal( ldap_pvt_thread_cond_t *cond )
{
return( cond->lcv_created ? cv_notify( cv->lcv_cv ) : 0 );
}
int
ldap_pvt_thread_cond_wait( ldap_pvt_thread_cond_t *cond,
ldap_pvt_thread_mutex_t *mutex )
{
if ( ! cond->lcv_created ) {
cv_create( &cond->lcv_cv, *mutex );
cond->lcv_created = 1;
}
return( cv_wait( cond->lcv_cv ) );
}
int
ldap_pvt_thread_mutex_init( ldap_pvt_thread_mutex_t *mutex,
ldap_pvt_thread_mutexattr_t *attr )
{
return( mon_create( mutex ) );
}
int
ldap_pvt_thread_mutex_destroy( ldap_pvt_thread_mutex_t *mutex )
{
return( mon_destroy( *mutex ) );
}
int
ldap_pvt_thread_mutex_lock( ldap_pvt_thread_mutex_t *mutex )
{
return( mon_enter( *mutex ) );
}
int
ldap_pvt_thread_mutex_unlock( ldap_pvt_thread_mutex_t *mutex )
{
return( mon_exit( *mutex ) );
}
int
ldap_pvt_thread_mutex_trylock( ldap_pvt_thread_mutex_t *mp )
{
return( mon_cond_enter( *mp ) );
}
int
ldap_pvt_thread_cond_destroy( ldap_pvt_thread_cond_t *cv )
{
return( cv->lcv_created ? cv_destroy( cv->lcv_cv ) : 0 );
}
int
ldap_pvt_thread_cond_broadcast( ldap_pvt_thread_cond_t *cv )
{
return( cv->lcv_created ? cv_broadcast( cv->lcv_cv ) : 0 );
}
#endif /* HAVE_LWP */