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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 Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is the Netscape Portable Runtime (NSPR).
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998-2000 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU General Public License Version 2 or later (the
* "GPL"), in which case the provisions of the GPL are applicable
* instead of those above. If you wish to allow use of your
* version of this file only under the terms of the GPL and not to
* allow others to use your version of this file under the MPL,
* indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by
* the GPL. If you do not delete the provisions above, a recipient
* may use your version of this file under either the MPL or the
* GPL.
*/
#include "primpl.h"
void _MD_EarlyInit(void)
{
}
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
void
_MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
{
return;
}
PRStatus
_MD_InitializeThread(PRThread *thread)
{
return PR_SUCCESS;
}
PRStatus
_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
{
PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
_PR_MD_SWITCH_CONTEXT(thread);
return PR_SUCCESS;
}
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 OSF1 */
void
_MD_YIELD(void)
{
PR_NOT_REACHED("_MD_YIELD should not be called for OSF1.");
}
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 OSF1.");
return PR_FAILURE;
}
#endif /* ! _PR_PTHREADS */
#ifdef _PR_HAVE_ATOMIC_CAS
#include <c_asm.h>
#define _PR_OSF_ATOMIC_LOCK 1
void
PR_StackPush(PRStack *stack, PRStackElem *stack_elem)
{
long locked;
do {
while ((long) stack->prstk_head.prstk_elem_next ==
_PR_OSF_ATOMIC_LOCK)
;
locked = __ATOMIC_EXCH_QUAD(&stack->prstk_head.prstk_elem_next,
_PR_OSF_ATOMIC_LOCK);
} while (locked == _PR_OSF_ATOMIC_LOCK);
stack_elem->prstk_elem_next = (PRStackElem *) locked;
/*
* memory-barrier instruction
*/
asm("mb");
stack->prstk_head.prstk_elem_next = stack_elem;
}
PRStackElem *
PR_StackPop(PRStack *stack)
{
PRStackElem *element;
long locked;
do {
while ((long)stack->prstk_head.prstk_elem_next == _PR_OSF_ATOMIC_LOCK)
;
locked = __ATOMIC_EXCH_QUAD(&stack->prstk_head.prstk_elem_next,
_PR_OSF_ATOMIC_LOCK);
} while (locked == _PR_OSF_ATOMIC_LOCK);
element = (PRStackElem *) locked;
if (element == NULL) {
stack->prstk_head.prstk_elem_next = NULL;
} else {
stack->prstk_head.prstk_elem_next =
element->prstk_elem_next;
}
/*
* memory-barrier instruction
*/
asm("mb");
return element;
}
#endif /* _PR_HAVE_ATOMIC_CAS */
/*
** thread_suspend and thread_resume are used by the gc code
** in nsprpub/pr/src/pthreads/ptthread.c
**
** These routines are never called for the current thread, and
** there is no check for that - so beware!
*/
int thread_suspend(PRThread *thr_id) {
extern int pthread_suspend_np (
pthread_t thread,
__pthreadLongUint_t *regs,
void *spare);
__pthreadLongUint_t regs[34];
int res;
/*
** A return res < 0 indicates that the thread was suspended
** but register information could not be obtained
*/
res = pthread_suspend_np(thr_id->id,®s[0],0);
if (res==0)
thr_id->sp = (void *) regs[30];
thr_id->suspend |= PT_THREAD_SUSPENDED;
/* Always succeeds */
return 0;
}
int thread_resume(PRThread *thr_id) {
extern int pthread_resume_np(pthread_t thread);
int res;
res = pthread_resume_np (thr_id->id);
thr_id->suspend |= PT_THREAD_RESUMED;
return 0;
}
/*
** Stubs for nspr_symvec.opt
**
** PR_ResumeSet, PR_ResumeTest, and PR_SuspendAllSuspended
** (defined in ptthread.c) used to be exported by mistake
** (because they look like public functions). They have been
** converted into static functions.
**
** There is an existing third-party binary that uses NSPR: the
** Java plugin for Mozilla. Because it is part of the Java
** SDK, we have no control over its releases. So we need these
** stub functions to occupy the slots that used to be occupied
** by PR_ResumeSet, PR_ResumeTest, and PR_SuspendAllSuspended
** in the symbol vector so that LIBNSPR4 is backward compatible.
*/
void PR_VMS_Stub1(void) { }
void PR_VMS_Stub2(void) { }
void PR_VMS_Stub3(void) { }
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