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256 lines
6.5 KiB
C
256 lines
6.5 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* JavaScript Debugging support - Locking and threading support
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*/
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/*
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* ifdef JSD_USE_NSPR_LOCKS then you musat build and run against NSPR2.
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* Otherwise, there are stubs that can be filled in with your own locking
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* code. Also, note that these stubs include a jsd_CurrentThread()
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* implementation that only works on Win32 - this is needed for the inprocess
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* Java-based debugger.
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*/
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#include "jsd.h"
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#ifdef JSD_THREADSAFE
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#ifdef JSD_USE_NSPR_LOCKS
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#include "prlock.h"
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#include "prthread.h"
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#ifdef JSD_ATTACH_THREAD_HACK
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#include "pprthred.h" /* need this as long as JS_AttachThread is needed */
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#endif
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struct JSDStaticLock
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{
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void* owner;
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PRLock* lock;
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int count;
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#ifdef DEBUG
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uint16 sig;
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#endif
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};
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/*
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* This exists to wrap non-NSPR theads (e.g. Java threads) in NSPR wrappers.
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* XXX We ignore the memory leak issue.
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* It is claimed that future versions of NSPR will automatically wrap on
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* the call to PR_GetCurrentThread.
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*
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* XXX We ignore the memory leak issue - i.e. we never call PR_DetachThread.
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*
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*/
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#undef _CURRENT_THREAD
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#ifdef JSD_ATTACH_THREAD_HACK
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#define _CURRENT_THREAD(out) \
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JS_BEGIN_MACRO \
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out = (void*) PR_GetCurrentThread(); \
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if(!out) \
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out = (void*) JS_AttachThread(PR_USER_THREAD,PR_PRIORITY_NORMAL,NULL);\
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JS_ASSERT(out); \
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JS_END_MACRO
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#else
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#define _CURRENT_THREAD(out) \
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JS_BEGIN_MACRO \
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out = (void*) PR_GetCurrentThread(); \
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JS_ASSERT(out); \
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JS_END_MACRO
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#endif
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#ifdef DEBUG
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#define JSD_LOCK_SIG 0x10CC10CC
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void ASSERT_VALID_LOCK(JSDStaticLock* lock)
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{
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JS_ASSERT(lock);
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JS_ASSERT(lock->lock);
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JS_ASSERT(lock->count >= 0);
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JS_ASSERT((! lock->count && ! lock->owner) || (lock->count && lock->owner));
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JS_ASSERT(lock->sig == (uint16) JSD_LOCK_SIG);
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}
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#else
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#define ASSERT_VALID_LOCK(x) ((void)0)
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#endif
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void*
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jsd_CreateLock()
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{
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JSDStaticLock* lock;
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if( ! (lock = calloc(1, sizeof(JSDStaticLock))) ||
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! (lock->lock = PR_NewLock()) )
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{
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if(lock)
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{
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free(lock);
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lock = NULL;
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}
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}
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#ifdef DEBUG
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if(lock) lock->sig = (uint16) JSD_LOCK_SIG;
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#endif
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return lock;
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}
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void
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jsd_Lock(JSDStaticLock* lock)
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{
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void* me;
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_CURRENT_THREAD(me);
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ASSERT_VALID_LOCK(lock);
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if(lock->owner == me)
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lock->count++;
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else
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{
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PR_Lock(lock->lock); /* this can block... */
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JS_ASSERT(lock->owner == 0);
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lock->count = 1;
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lock->owner = me;
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}
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ASSERT_VALID_LOCK(lock);
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}
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void
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jsd_Unlock(JSDStaticLock* lock)
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{
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void* me;
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ASSERT_VALID_LOCK(lock);
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_CURRENT_THREAD(me);
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if(lock->owner != me)
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{
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JS_ASSERT(0); /* it's an error to unlock a lock you don't own */
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return;
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}
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if(--lock->count == 0)
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{
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lock->owner = NULL;
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PR_Unlock(lock->lock);
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}
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ASSERT_VALID_LOCK(lock);
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}
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#ifdef DEBUG
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JSBool
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jsd_IsLocked(JSDStaticLock* lock)
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{
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void* me;
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ASSERT_VALID_LOCK(lock);
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_CURRENT_THREAD(me);
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return lock->owner == me ? JS_TRUE : JS_FALSE;
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}
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#endif /* DEBUG */
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void*
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jsd_CurrentThread()
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{
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void* me;
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_CURRENT_THREAD(me);
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return me;
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}
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#else /* ! JSD_USE_NSPR_LOCKS */
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#ifdef WIN32
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#pragma message("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")
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#pragma message("!! you are compiling the stubbed version of jsd_lock.c !!")
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#pragma message("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")
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#endif
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/*
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* NOTE: 'Real' versions of these locks must be reentrant in the sense that
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* they support nested calls to lock and unlock.
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*/
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void*
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jsd_CreateLock()
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{
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return (void*)1;
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}
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void
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jsd_Lock(void* lock)
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{
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}
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void
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jsd_Unlock(void* lock)
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{
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}
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#ifdef DEBUG
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JSBool
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jsd_IsLocked(void* lock)
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{
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return JS_TRUE;
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}
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#endif /* DEBUG */
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/*
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* This Windows only thread id code is here to allow the Java-based
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* JSDebugger to work with the single threaded js.c shell (even without
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* real locking and threading support).
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*/
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#ifdef WIN32
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/* bogus (but good enough) declaration*/
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extern void* __stdcall GetCurrentThreadId(void);
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#endif
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void*
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jsd_CurrentThread()
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{
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#ifdef WIN32
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return GetCurrentThreadId();
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#else
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return (void*)1;
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#endif
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}
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#endif /* JSD_USE_NSPR_LOCKS */
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#endif /* JSD_THREADSAFE */
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