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fix deadlock when trying to create a module with the same name as a 

predicate (for now, just don't lock modules). obs Paulo Moura.


git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1869 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
This commit is contained in:
vsc 2007-04-18 23:01:16 +00:00
parent ee03654060
commit dc3b7079f4
3 changed files with 25 additions and 13 deletions
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12
C/c_interface.c
View File

@ -10,8 +10,11 @@
* File: c_interface.c *
* comments: c_interface primitives definition *
* *
* Last rev: $Date: 2007-03-30 16:47:22 $,$Author: vsc $ *
* Last rev: $Date: 2007-04-18 23:01:16 $,$Author: vsc $ *
* $Log: not supported by cvs2svn $
* Revision 1.91 2007/03/30 16:47:22 vsc
* fix gmpless blob handling
*
* Revision 1.90 2007/03/22 11:12:20 vsc
* make sure that YAP_Restart does not restart a failed goal.
*
@ -1645,7 +1648,12 @@ YAP_CurrentModule(void)
X_API Term
YAP_CreateModule(Atom at)
{
return Yap_Module(MkAtomTerm(at));
Term t;
WRITE_LOCK(RepAtom(at)->ARWLock);
t = Yap_Module(MkAtomTerm(at));
WRITE_UNLOCK(RepAtom(at)->ARWLock);
return t;
}
X_API int

17
C/modules.c
View File

@ -33,17 +33,18 @@ FetchModuleEntry(Atom at)
Prop p0;
AtomEntry *ae = RepAtom(at);
WRITE_LOCK(ae->ARWLock);
READ_LOCK(ae->ARWLock);
p0 = ae->PropsOfAE;
while (p0) {
ModEntry *me = RepModProp(p0);
if ( me->KindOfPE == ModProperty
) {
WRITE_UNLOCK(ae->ARWLock);
READ_UNLOCK(ae->ARWLock);
return me;
}
p0 = me->NextOfPE;
}
READ_UNLOCK(ae->ARWLock);
return NULL;
}
@ -55,13 +56,11 @@ GetModuleEntry(Atom at)
AtomEntry *ae = RepAtom(at);
ModEntry *new;
WRITE_LOCK(ae->ARWLock);
p0 = ae->PropsOfAE;
while (p0) {
ModEntry *me = RepModProp(p0);
if ( me->KindOfPE == ModProperty
) {
WRITE_UNLOCK(ae->ARWLock);
return me;
}
p0 = me->NextOfPE;
@ -75,7 +74,6 @@ GetModuleEntry(Atom at)
new->AtomOfME = ae;
new->NextOfPE = ae->PropsOfAE;
ae->PropsOfAE = AbsModProp(new);
WRITE_UNLOCK(ae->ARWLock);
return new;
}
@ -105,12 +103,14 @@ static ModEntry *
LookupModule(Term a)
{
Atom at;
ModEntry *me;
/* prolog module */
if (a == 0)
return GetModuleEntry(AtomOfTerm(TermProlog));
at = AtomOfTerm(a);
return GetModuleEntry(at);
me = GetModuleEntry(at);
return me;
}
Term
@ -136,9 +136,10 @@ Yap_NewModulePred(Term mod, struct pred_entry *ap)
if (!(me = LookupModule(mod)))
return;
/* LOCK THIS */
WRITE_LOCK(me->ModRWLock);
ap->NextPredOfModule = me->PredForME;
me->PredForME = ap;
WRITE_UNLOCK(me->ModRWLock);
}
static Int
@ -162,7 +163,7 @@ p_current_module(void)
CurrentModule = t;
LookupModule(CurrentModule);
}
return (TRUE);
return TRUE;
}
static Int

9
C/stdpreds.c
View File

@ -11,8 +11,11 @@
* File: stdpreds.c *
* comments: General-purpose C implemented system predicates *
* *
* Last rev: $Date: 2007-02-26 10:41:40 $,$Author: vsc $ *
* Last rev: $Date: 2007-04-18 23:01:16 $,$Author: vsc $ *
* $Log: not supported by cvs2svn $
* Revision 1.118 2007/02/26 10:41:40 vsc
* fix prolog_flags for chr.
*
* Revision 1.117 2007/01/28 14:26:37 vsc
* WIN32 support
*
@ -2480,9 +2483,9 @@ cont_current_predicate(void)
Term name;
while (pp != NULL) {
if (pp->PredFlags & HiddenPredFlag)
if (pp->PredFlags & HiddenPredFlag) {
pp = pp->NextPredOfModule;
else
} else
break;
}
if (pp == NULL)