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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "primpl.h"
/*
* NSPR 2.0 overrides the system select() and poll() functions.
* On AIX 4.2, we use dlopen("/unix", RTLD_NOW) and dlsym() to get
* at the original system select() and poll() functions.
*/
#ifndef AIX4_1
#include <sys/select.h>
#include <sys/poll.h>
#include <dlfcn.h>
static void *aix_handle = NULL;
static int (*aix_select_fcn)() = NULL;
static int (*aix_poll_fcn)() = NULL;
int _MD_SELECT(int width, fd_set *r, fd_set *w, fd_set *e, struct timeval *t)
{
int rv;
if (!aix_select_fcn) {
if (!aix_handle) {
aix_handle = dlopen("/unix", RTLD_NOW);
if (!aix_handle) {
PR_SetError(PR_UNKNOWN_ERROR, 0);
return -1;
}
}
aix_select_fcn = (int(*)())dlsym(aix_handle,"select");
if (!aix_select_fcn) {
PR_SetError(PR_UNKNOWN_ERROR, 0);
return -1;
}
}
rv = (*aix_select_fcn)(width, r, w, e, t);
return rv;
}
int _MD_POLL(void *listptr, unsigned long nfds, long timeout)
{
int rv;
if (!aix_poll_fcn) {
if (!aix_handle) {
aix_handle = dlopen("/unix", RTLD_NOW);
if (!aix_handle) {
PR_SetError(PR_UNKNOWN_ERROR, 0);
return -1;
}
}
aix_poll_fcn = (int(*)())dlsym(aix_handle,"poll");
if (!aix_poll_fcn) {
PR_SetError(PR_UNKNOWN_ERROR, 0);
return -1;
}
}
rv = (*aix_poll_fcn)(listptr, nfds, timeout);
return rv;
}
#else
/*
* In AIX versions prior to 4.2, we use the two-step rename/link trick.
* The binary must contain at least one "poll" symbol for linker's rename
* to work. So we must have this dummy function that references poll().
*/
#include <sys/poll.h>
void _pr_aix_dummy()
{
poll(0,0,0);
}
#endif /* !AIX4_1 */
#include <sys/atomic_op.h>
PRInt32 _AIX_AtomicSet(PRInt32 *val, PRInt32 newval)
{
PRIntn oldval;
boolean_t stored;
oldval = fetch_and_add((atomic_p)val, 0);
do
{
stored = compare_and_swap((atomic_p)val, &oldval, newval);
} while (!stored);
return oldval;
} /* _AIX_AtomicSet */
#if !defined(PTHREADS_USER)
#ifdef _PR_PTHREADS
/*
* AIX 4.3 has sched_yield(). AIX 4.2 has pthread_yield().
* So we look up the appropriate function pointer at run time.
*/
int (*_PT_aix_yield_fcn)() = NULL;
void _MD_EarlyInit(void)
{
void *main_app_handle = NULL;
main_app_handle = dlopen(NULL, RTLD_NOW);
PR_ASSERT(NULL != main_app_handle);
_PT_aix_yield_fcn = (int(*)())dlsym(main_app_handle, "sched_yield");
if (!_PT_aix_yield_fcn) {
_PT_aix_yield_fcn = (int(*)())dlsym(main_app_handle,"pthread_yield");
PR_ASSERT(NULL != _PT_aix_yield_fcn);
}
dlclose(main_app_handle);
}
#else /* _PR_PTHREADS */
void _MD_EarlyInit(void)
{
}
#endif /* _PR_PTHREADS */
PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
{
#ifndef _PR_PTHREADS
if (isCurrent) {
(void) setjmp(CONTEXT(t));
}
*np = sizeof(CONTEXT(t)) / sizeof(PRWord);
return (PRWord *) CONTEXT(t);
#else
*np = 0;
return NULL;
#endif
}
#ifndef _PR_PTHREADS
PR_IMPLEMENT(void)
_MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
{
return;
}
PR_IMPLEMENT(PRStatus)
_MD_InitializeThread(PRThread *thread)
{
return PR_SUCCESS;
}
PR_IMPLEMENT(PRStatus)
_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
{
PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
_PR_MD_SWITCH_CONTEXT(thread);
return PR_SUCCESS;
}
PR_IMPLEMENT(PRStatus)
_MD_WAKEUP_WAITER(PRThread *thread)
{
if (thread) {
PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
}
return PR_SUCCESS;
}
/* These functions should not be called for AIX */
PR_IMPLEMENT(void)
_MD_YIELD(void)
{
PR_NOT_REACHED("_MD_YIELD should not be called for AIX.");
}
PR_IMPLEMENT(PRStatus)
_MD_CREATE_THREAD(
PRThread *thread,
void (*start) (void *),
PRThreadPriority priority,
PRThreadScope scope,
PRThreadState state,
PRUint32 stackSize)
{
PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for AIX.");
}
#endif /* _PR_PTHREADS */
#endif /* PTHREADS_USER */
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